feat: regsub variable declaration check

Reviewed-on: #25

.gitea/workflows/build_and_puplish.yml

@@ -5,8 +5,11 @@ jobs:
     build_and_publish:
         runs-on: ubuntu-latest
         steps:
-            - name: Checkout code
+            - name: Checkout branch from release
               uses: actions/checkout@v4
+              with:
+                  ref: ${{ github.event.release.target_commitish }}
+                  fetch-depth: 0
             - name: GitHub Tag Name example
               run: |
                   echo "Tag name from GITHUB_REF_NAME: $GITHUB_REF_NAME"
@@ -26,14 +29,31 @@ jobs:
             - name: Build Package Files
               run: npm run package
             - name: Update package.json Version
-              run: npm version ${{ github.ref_name }} --no-git-tag-version
+              run: npm version ${{ github.ref_name }} --no-git-tag-version --allow-same-version
             - name: Commit and Push Changes
               run: |
                   git config user.name "${{ vars.USERNAME_GIT }}"
                   git config user.email "${{ vars.EMAIL_GIT }}"
                   git add package.json
-                  git commit -m "Update version to ${{ github.ref_name }}"
-                  git push origin HEAD:main
+                  git commit -m "Update version to ${{ github.ref_name }}" || echo "No changes to commit."
+
+                  # Get current branch; if detached, resolve to a remote branch that contains this commit
+                  BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+                  if [[ "$BRANCH" == "HEAD" || -z "$BRANCH" ]]; then
+                    # If target_commitish is a branch, use it; if it's a SHA, find a branch that contains it
+                    CANDIDATE='${{ github.event.release.target_commitish }}'
+                    if [[ "$CANDIDATE" =~ ^[0-9a-f]{40}$ ]]; then
+                      BRANCH="$(git branch -r --contains "$GITHUB_SHA" | sed -n 's|.*origin/||p' | head -n1)"
+                    else
+                      BRANCH="$CANDIDATE"
+                    fi
+                  fi
+
+                  if [[ -z "$BRANCH" ]]; then
+                    echo "Could not determine branch for push."; git branch -a; exit 1
+                  fi
+
+                  git push origin HEAD:refs/heads/$BRANCH
             - name: Publish to Visual Studio Marketplace (Pre-Release)
               if: ${{ github.event.release.prerelease }}
               run: vsce publish --pre-release

LICENSE

@@ -1,21 +1,661 @@
-MIT License
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
 
-Copyright (c) 2025 Christoph
+Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software. This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time. Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    nx-post-support
+    Copyright (C) 2025  Christoph
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1,6 +1,6 @@
 # NX Postprocessor Support
 
-A comprehensive VS Code extension providing language support for NX CAD postprocessor development, including CDL (Cutter Definition Language), TCL, and DEF files.
+A comprehensive VS Code extension providing language support for NX CAM postprocessor development, including CDL, TCL, and DEF files.
 
 ## Features
 
@@ -12,7 +12,7 @@ A comprehensive VS Code extension providing language support for NX CAD postproc
 
 ## Supported File Types
 
-- `.cdl` - NX Cutter Definition Language files
+- `.cdl` - NX User Defined Event File
 - `.tcl` - NX TCL postprocessor files
 - `.def` - NX Definition files
 
@@ -46,4 +46,4 @@ This extension is actively maintained. For issues or feature requests, please vi
 
 ## License
 
-MIT License - see LICENSE file for details.
+AGPL-3.0 License - see LICENSE file for details.

client/src/common/handlers.ts

@@ -271,3 +271,180 @@ export function tclDocumentSymbolProvider(document: vscode.TextDocument): vscode
 
     return collectSymbols(rootScope)
 }
+
+export function cdlDocumentSymbolProvider(document: vscode.TextDocument): vscode.DocumentSymbol[] {
+    const lines = document.getText().split("\n")
+
+    interface Scope {
+        symbol: vscode.DocumentSymbol
+        startLine: number
+    }
+
+    const root = new vscode.DocumentSymbol(
+        "root",
+        "",
+        vscode.SymbolKind.Namespace,
+        new vscode.Range(0, 0, lines.length, 0),
+        new vscode.Range(0, 0, 0, 0)
+    )
+    root.children = []
+    const stack: Scope[] = [{ symbol: root, startLine: 0 }]
+
+    let pending: { name: string; kind: vscode.SymbolKind; startLine: number } | null = null
+
+    for (let i = 0; i < lines.length; i++) {
+        const line = lines[i]
+        const trimmed = line.trim()
+
+        const createSymbol = () => {
+            if (!pending) {
+                return
+            }
+            const startRange = new vscode.Range(
+                pending.startLine,
+                0,
+                pending.startLine,
+                lines[pending.startLine].length
+            )
+            const symbol = new vscode.DocumentSymbol(
+                pending.name,
+                "",
+                pending.kind,
+                startRange,
+                startRange
+            )
+            symbol.children = []
+            stack[stack.length - 1].symbol.children?.push(symbol)
+            stack.push({ symbol, startLine: pending.startLine })
+            pending = null
+        }
+
+        if (pending && trimmed.includes("{")) {
+            createSymbol()
+        }
+
+        if (trimmed.startsWith("}")) {
+            const scope = stack.pop()
+            if (scope) {
+                scope.symbol.range = new vscode.Range(scope.startLine, 0, i, line.length)
+            }
+            continue
+        }
+
+        let match
+        if ((match = /^\s*EVENT\s+(\w+)/.exec(line))) {
+            pending = {
+                name: match[1],
+                kind: vscode.SymbolKind.Event,
+                startLine: i
+            }
+            if (line.includes("{")) {
+                createSymbol()
+            }
+        } else if ((match = /^\s*PARAM\s+(\w+)/.exec(line))) {
+            pending = {
+                name: match[1],
+                kind: vscode.SymbolKind.Field,
+                startLine: i
+            }
+            if (line.includes("{")) {
+                createSymbol()
+            }
+        }
+    }
+
+    return root.children || []
+}
+
+export function defDocumentSymbolProvider(document: vscode.TextDocument): vscode.DocumentSymbol[] {
+    const lines = document.getText().split("\n")
+
+    interface Scope {
+        symbol: vscode.DocumentSymbol
+        startLine: number
+    }
+
+    const root = new vscode.DocumentSymbol(
+        "root",
+        "",
+        vscode.SymbolKind.Namespace,
+        new vscode.Range(0, 0, lines.length, 0),
+        new vscode.Range(0, 0, 0, 0)
+    )
+    root.children = []
+    const stack: Scope[] = [{ symbol: root, startLine: 0 }]
+
+    let pending: { name: string; kind: vscode.SymbolKind; startLine: number } | null = null
+
+    for (let i = 0; i < lines.length; i++) {
+        const line = lines[i]
+        const trimmed = line.trim()
+
+        const createSymbol = () => {
+            if (!pending) {
+                return
+            }
+            const startRange = new vscode.Range(
+                pending.startLine,
+                0,
+                pending.startLine,
+                lines[pending.startLine].length
+            )
+            const symbol = new vscode.DocumentSymbol(
+                pending.name,
+                "",
+                pending.kind,
+                startRange,
+                startRange
+            )
+            symbol.children = []
+            stack[stack.length - 1].symbol.children?.push(symbol)
+            stack.push({ symbol, startLine: pending.startLine })
+            pending = null
+        }
+
+        if (pending && trimmed.includes("{")) {
+            createSymbol()
+        }
+
+        if (trimmed.startsWith("}")) {
+            const scope = stack.pop()
+            if (scope) {
+                scope.symbol.range = new vscode.Range(scope.startLine, 0, i, line.length)
+            }
+            continue
+        }
+
+        let match
+        if ((match = /^\s*FORMATTING\b/.exec(line))) {
+            pending = {
+                name: "FORMATTING",
+                kind: vscode.SymbolKind.Module,
+                startLine: i
+            }
+            if (line.includes("{")) {
+                createSymbol()
+            }
+        } else if ((match = /^\s*ADDRESS\s+(\w+)/.exec(line))) {
+            pending = {
+                name: match[1],
+                kind: vscode.SymbolKind.Field,
+                startLine: i
+            }
+            if (line.includes("{")) {
+                createSymbol()
+            }
+        } else if ((match = /^\s*BLOCK_TEMPLATE\s+(\w+)/.exec(line))) {
+            pending = {
+                name: match[1],
+                kind: vscode.SymbolKind.Function,
+                startLine: i
+            }
+            if (line.includes("{")) {
+                createSymbol()
+            }
+        }
+    }
+
+    return root.children || []
+}

client/src/common/settings.ts

@@ -79,7 +79,8 @@ export async function getWorkspaceSettings(
         interpreter: resolveVariables(interpreter, workspace),
         importStrategy: config.get<string>(`importStrategy`) ?? "useBundled",
         showNotifications: config.get<string>(`showNotifications`) ?? "off",
-        formatter: config.get<boolean>(`formatter`) ?? true
+        formatter: config.get<boolean>(`formatter`) ?? true,
+        inlayHint: config.get<boolean>(`inlayHint`) ?? true
     }
     return workspaceSetting
 }
@@ -111,7 +112,8 @@ export async function getGlobalSettings(
         interpreter: interpreter,
         importStrategy: getGlobalValue<string>(config, "importStrategy", "useBundled"),
         showNotifications: getGlobalValue<string>(config, "showNotifications", "off"),
-        formatter: config.get<boolean>(`formatter`) ?? true
+        formatter: config.get<boolean>(`formatter`) ?? true,
+        inlayHint: config.get<boolean>(`inlayHint`) ?? true
     }
     return setting
 }
@@ -126,7 +128,8 @@ export function checkIfConfigurationChanged(
         `${namespace}.interpreter`,
         `${namespace}.importStrategy`,
         `${namespace}.showNotifications`,
-        `${namespace}.formatter`
+        `${namespace}.formatter`,
+        `${namespace}.inlayHint`
     ]
     const changed = settings.map((s) => e.affectsConfiguration(s))
     return changed.includes(true)

client/src/extension.ts

@@ -12,7 +12,8 @@ import {
     formatDefFile,
     isFirstLineMachine,
     diagnosticHandler,
-    tclDocumentSymbolProvider
+    cdlDocumentSymbolProvider,
+    defDocumentSymbolProvider
 } from "./common/handlers"
 import { registerLogger, traceError, traceLog, traceVerbose } from "./common/log/logging"
 import {
@@ -179,11 +180,26 @@ export async function activate(context: vscode.ExtensionContext) {
 
     context.subscriptions.push(formatDefProvider)
 
-    const tclOutlineProvider = vscode.languages.registerDocumentSymbolProvider(
-        { scheme: "file", language: "tcl" },
-        { provideDocumentSymbols: tclDocumentSymbolProvider }
+    const cdlSymbolProvider = vscode.languages.registerDocumentSymbolProvider(
+        { scheme: "file", language: "cdl" },
+        {
+            provideDocumentSymbols(document: vscode.TextDocument) {
+                return cdlDocumentSymbolProvider(document)
+            }
+        }
     )
-    context.subscriptions.push(tclOutlineProvider)
+    context.subscriptions.push(cdlSymbolProvider)
+
+    // Outline now provided by the language server (Document Symbols). Removing TS provider.
+    const defSymbolProvider = vscode.languages.registerDocumentSymbolProvider(
+        { scheme: "file", language: "def" },
+        {
+            provideDocumentSymbols(document: vscode.TextDocument) {
+                return defDocumentSymbolProvider(document)
+            }
+        }
+    )
+    context.subscriptions.push(defSymbolProvider)
 
     // Diagnostics collection
     const diagnosticCollectionCdl = vscode.languages.createDiagnosticCollection("cdl")

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "nx-post-support",
-  "version": "0.3.0",
+  "version": "2025.9.100",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "nx-post-support",
-      "version": "0.3.0",
+      "version": "2025.9.100",
       "devDependencies": {
         "@types/vscode": "^1.96.0",
         "@vscode/vsce": "^3.2.1",

package.json

@@ -2,7 +2,7 @@
   "name": "nx-post-support",
   "displayName": "NX Postprocessor Support",
   "description": "",
-  "version": "2025.8.101",
+  "version": "2025.9.101",
   "publisher": "Christoph",
   "icon": "images/nx-1.png",
   "serverInfo": {
@@ -17,7 +17,10 @@
   "keywords": [
     "cdl",
     "NX CDL",
-    "UDE"
+    "UDE",
+    "Postprocessor",
+    "NX CAM",
+    "Siemens NX"
   ],
   "engines": {
     "vscode": "^1.96.0"
@@ -85,6 +88,11 @@
           "default": false,
           "description": "Use the TCL formatter from `NX Postprocessor Support`"
         },
+        "nx-post-support.inlayHint": {
+          "type": "boolean",
+          "default": true,
+          "description": "Use the Inlay Hints in from `NX Postprocessor Support`"
+        },
         "nx-post-support.importStrategy": {
           "default": "useBundled",
           "description": "Defines where `NX Postprocessor Support` is imported from.",

server/src/common/completion_list.json

@@ -71,6 +71,10 @@
         {
             "label": "expr",
             "kind": "keyword"
+        },
+        {
+            "label": "return",
+            "kind": "keyword"
         }
     ],
     "MOM_procs": [

server/src/lsp_server.py

@@ -9,7 +9,9 @@ import os
 import pathlib
 import re
 import sys
-from typing import Any, List, Optional, Tuple
+import threading
+
+from typing import Any, Optional
 import operator
 from functools import reduce
 
@@ -38,128 +40,18 @@ update_sys_path(
 # pylint: disable=wrong-import-position,import-error
 import lsp_jsonrpc as jsonrpc
 import lsprotocol.types as lsp
-from pygls import server, uris, workspace
-from pygls.workspace.text_document import TextDocument
+from pygls import uris, workspace
 from common.load_data import standard_items
-from tclint.lexer import TclSyntaxError
-from tclint.format import Formatter, FormatterOpts
-from tclint.violations import Violation
-from plugins.poco_plugin import commands
-from tools import checks, parser
 from tools.semantic_tokens import _Highlighter, TOKEN_TYPES, TokenModifier
 from tools.completion_items import completion, remove_existing_items, remove_shared_keys
 from tools.inlay_hint import InlayHintGenerator
 from tools.file_sourcing import get_all_psc_files, read_psc_file
-
-DIAGNOSTIC_SOURCE = "nx-post-support"
-
-
-class TclLanguageServer(server.LanguageServer):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.parser = parser.CustomParser()
-        for command in commands:
-            self.parser._commands.update(command)
-        self.diagnostics = {}
-        self.poco_completion: dict = {}
-        self.proc_signatures: dict = {}
-
-    def format(
-        self,
-        document: TextDocument,
-        options: lsp.FormattingOptions,
-        range: Optional[Tuple[int, int]] = None,
-    ):
-        # parser = Parser(command_plugins=["nx_plugins.poco_plugin.py"])
-        # parser._commands.update(commands)
-
-        indent = "\t" if not options.insert_spaces else " " * options.tab_size
-        formatter = Formatter(
-            FormatterOpts(
-                indent=indent,
-                spaces_in_braces=False,
-                max_blank_lines=500,
-                indent_namespace_eval=True,
-            ),
-        )
-
-        if range is not None:
-            start, end = range
-            return formatter.format_partial(document.source[start:end], self.parser)
-
-        return formatter.format_top(document.source, self.parser)
-
-    def linter(
-        self,
-        document: TextDocument,
-    ) -> List[Violation]:
-        violations = []
-        self.parser.violations = []
-        tree = self.parser.parse(document.source)
-        violations += self.parser.violations
-        # log_to_output(tree.pretty(2))
-        for checker in checks.get_checkers():
-            violations += checker.check(document.source, tree)
-        return violations
-
-    def lint(self, document: TextDocument):
-        diagnostics = []
-
-        try:
-            violations = self.linter(document)
-        except TclSyntaxError as e:
-            return [
-                lsp.Diagnostic(
-                    message=str(e),
-                    severity=lsp.DiagnosticSeverity.Error,
-                    range=lsp.Range(
-                        start=lsp.Position(e.start[0] - 1, e.start[1] - 1),
-                        end=lsp.Position(e.end[0] - 1, e.end[1] - 1),
-                    ),
-                    code="syntax error",
-                    source=DIAGNOSTIC_SOURCE,
-                )
-            ]
-
-        for violation in violations:
-            message = violation.message
-            severity = lsp.DiagnosticSeverity.Warning
-            start = lsp.Position(line=violation.start[0] - 1, character=violation.start[1] - 1)
-            end = lsp.Position(line=violation.end[0] - 1, character=violation.end[1] - 1)
-
-            diagnostics.append(
-                lsp.Diagnostic(
-                    message=message,
-                    severity=severity,
-                    range=lsp.Range(
-                        start=start,
-                        end=end,
-                    ),
-                    code=violation.id,
-                    source=DIAGNOSTIC_SOURCE,
-                )
-            )
-
-        return diagnostics
-
-    def _compute_diagnostics(self, document: TextDocument) -> List[lsp.Diagnostic]:
-        return self.lint(document)
-
-    def compute_diagnostics(self, document: TextDocument):
-        # `None` sentinel ensures that `diagnostics` gets updated if the URI is not
-        # present.
-        _, previous = self.diagnostics.get(document, (0, None))
-
-        diagnostics = self._compute_diagnostics(document)
-
-        # Only update if the list has changed
-        if previous != diagnostics:
-            self.diagnostics[document.uri] = (document.version, diagnostics)
+from tools.signature_help import get_signature_help
+from lsp_tclserver import TclLanguageServer
 
 
 WORKSPACE_SETTINGS = {}
 GLOBAL_SETTINGS = {}
-RUNNER = pathlib.Path(__file__).parent / "lsp_runner.py"
 
 
 MAX_WORKERS = 5
@@ -168,9 +60,7 @@ LSP_SERVER = TclLanguageServer(name="NX Postprocessor Support", version="0.0.1",
 # **********************************************************
 # Tool specific code goes below this.
 # **********************************************************
-TOOL_MODULE = "nx-post-support"
-TOOL_DISPLAY = "NX Postprocessor Support"
-TOOL_ARGS = []  # default arguments always passed to your tool.
+
 
 # Delete "Linting features" section if your tool is NOT a linter.
 # **********************************************************
@@ -186,6 +76,8 @@ def did_open(params: lsp.DidOpenTextDocumentParams) -> None:
     """LSP handler for textDocument/didOpen request."""
     document = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
     LSP_SERVER.compute_diagnostics(document)
+    # Also update custom completion and proc docs for this file
+    LSP_SERVER.update_poco_completion_for_file(document)
 
 
 @LSP_SERVER.feature(lsp.TEXT_DOCUMENT_DID_SAVE)
@@ -195,7 +87,7 @@ def did_save(params: lsp.DidSaveTextDocumentParams) -> None:
 
 
 @LSP_SERVER.feature(lsp.TEXT_DOCUMENT_DID_CLOSE)
-def did_close(params: lsp.DidCloseTextDocumentParams) -> None:
+def did_close(_: lsp.DidCloseTextDocumentParams) -> None:
     """LSP handler for textDocument/didClose request."""
 
 
@@ -204,6 +96,7 @@ def did_change(params: lsp.DidChangeTextDocumentParams) -> None:
     """LSP handler for textDocument/didChange request"""
     document = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
     LSP_SERVER.compute_diagnostics(document)
+    LSP_SERVER.update_poco_completion_for_file(document)
 
 
 @LSP_SERVER.feature(
@@ -232,14 +125,47 @@ def document_diagnostic(params: lsp.DocumentDiagnosticParams):
 
 
 @LSP_SERVER.feature(lsp.TEXT_DOCUMENT_COMPLETION)
-def on_completion(params: lsp.CompletionParams) -> list[lsp.CompletionItem]:
-    _ = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
-    poco = []
+def on_completion(params: lsp.CompletionParams) -> lsp.CompletionList:
+    from tools.variable_index import build_variable_index
+    from tools.completion_items import BUILTIN_VAR_LABELS
 
-    for key, value in LSP_SERVER.poco_completion.items():
-        poco.extend(value)
-    items = standard_items.tcl_keyword_list + standard_items.nx_procs + standard_items.nx_variables + poco
-    return lsp.CompletionList(is_incomplete=False, items=items)
+    doc = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
+
+    # Base items
+    poco = [item for items in LSP_SERVER.poco_completion.values() for item in items]
+    base_items = standard_items.tcl_keyword_list + standard_items.nx_procs + standard_items.nx_variables + poco
+
+    # Build variable index from current document
+    globals_set, procs_locals, proc_ranges = build_variable_index(doc.source)
+
+    # Always include globals (excluding built-ins)
+    dynamic_items = []
+    for name in sorted(globals_set):
+        if name not in BUILTIN_VAR_LABELS:
+            dynamic_items.append(lsp.CompletionItem(label=name, kind=lsp.CompletionItemKind.Variable))
+
+    # Include proc-local variables when cursor is inside that proc
+    pos = params.position
+    if pos is not None:
+        for pr in proc_ranges:
+            if pr.start_line <= pos.line <= (pr.end_line or pr.start_line):
+                for name in sorted(procs_locals.get(pr.name, set())):
+                    # Exclude built-ins and globals to avoid duplication
+                    if name not in BUILTIN_VAR_LABELS and name not in globals_set:
+                        dynamic_items.append(lsp.CompletionItem(label=name, kind=lsp.CompletionItemKind.Variable))
+                break
+
+    # Merge with de-duplication for variables only
+    merged: list[lsp.CompletionItem] = []
+    seen_var_labels: set[str] = set()
+    for it in base_items + dynamic_items:
+        if getattr(it, "kind", None) == lsp.CompletionItemKind.Variable:
+            if it.label in seen_var_labels:
+                continue
+            seen_var_labels.add(it.label)
+        merged.append(it)
+
+    return lsp.CompletionList(is_incomplete=False, items=merged)
 
 
 # @LSP_SERVER.feature(lsp.TEXT_DOCUMENT_DOCUMENT_SYMBOL)
@@ -251,18 +177,31 @@ def on_completion(params: lsp.CompletionParams) -> list[lsp.CompletionItem]:
 #     return symbols
 
 
+@LSP_SERVER.feature(lsp.TEXT_DOCUMENT_DOCUMENT_SYMBOL)
+def document_symbols(params: lsp.DocumentSymbolParams):
+    from tools.document_symbols import build_document_symbols
+
+    doc = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
+    return build_document_symbols(doc.source)
+
+
 @LSP_SERVER.feature(lsp.TEXT_DOCUMENT_INLAY_HINT)
 def inlay_hints(params: lsp.InlayHintParams):
+    if not GLOBAL_SETTINGS.get("inlayHint", False):
+        return []
     document = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
-    tree = LSP_SERVER.parser.parse(document.source)
 
-    # collect Inlay Hints
-    hints = []
-    for key, value in LSP_SERVER.proc_signatures.items():
-        generator = InlayHintGenerator(LSP_SERVER.proc_signatures[key])
-        tree.accept(generator, recurse=True)
-        hints += generator.hints
-    return hints
+    # Reuse cached AST
+    tree = LSP_SERVER.get_tree(document)
+
+    # Merge proc signatures across files and traverse once
+    merged_signatures = {}
+    for sigs in LSP_SERVER.proc_signatures.values():
+        merged_signatures.update(sigs)
+
+    generator = InlayHintGenerator(merged_signatures)
+    tree.accept(generator, recurse=True)
+    return generator.hints
 
 
 @LSP_SERVER.feature(
@@ -279,7 +218,8 @@ def semantic_tokens(params: lsp.SemanticTokensParams):
     plugins = []
     hl = _Highlighter(plugins, LSP_SERVER.poco_completion)
 
-    tree = LSP_SERVER.parser.parse(document.source)
+    # Reuse cached AST
+    tree = LSP_SERVER.get_tree(document)
     tree.accept(hl, recurse=True)
 
     tokens = hl.tokens()
@@ -288,7 +228,7 @@ def semantic_tokens(params: lsp.SemanticTokensParams):
             [
                 token.line,
                 token.offset,
-                token.lenght,
+                token.length,
                 TOKEN_TYPES.index(token.tok_type),
                 reduce(operator.or_, token.tok_modifiers, 0),
             ]
@@ -296,6 +236,22 @@ def semantic_tokens(params: lsp.SemanticTokensParams):
     return lsp.SemanticTokens(data=data)
 
 
+@LSP_SERVER.feature(
+    lsp.TEXT_DOCUMENT_SIGNATURE_HELP,
+    lsp.SignatureHelpOptions(trigger_characters=[" ", "\t", "[", ",", "(", "{", '"', "'"], retrigger_characters=list("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_:$\"'{}[]() ,\t")),
+)
+def signature_help(params: lsp.SignatureHelpParams) -> lsp.SignatureHelp | None:
+    document = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
+    tree = LSP_SERVER.get_tree(document)
+
+    # Merge proc signatures across files
+    merged_signatures = {}
+    for sigs in LSP_SERVER.proc_signatures.values():
+        merged_signatures.update(sigs)
+
+    return get_signature_help(document.source, tree, merged_signatures, params.position)
+
+
 @LSP_SERVER.feature(lsp.TEXT_DOCUMENT_HOVER)
 def hover(params: lsp.HoverParams) -> lsp.Hover:
     pos = params.position
@@ -308,6 +264,13 @@ def hover(params: lsp.HoverParams) -> lsp.Hover:
     except IndexError:
         return None
 
+    # Do not show hover for proc name in its declaration
+    from tools.proc_docs import is_proc_declaration_position
+
+    if is_proc_declaration_position(document.source, pos.line, pos.character):
+        return None
+
+    # Identify the token under the cursor
     for m in re.finditer(r"\b\w+\b", line):
         if m.start() <= col <= m.end():
             token = m.group(0)
@@ -315,49 +278,121 @@ def hover(params: lsp.HoverParams) -> lsp.Hover:
     else:
         return None
 
+    # 1) If token is a known MOM proc/variable, return built-in hover
     command = token
     data = standard_items.json_data
-
     all_items = data.get("MOM_procs", []) + data.get("mom_variables", [])
 
     match = next((item for item in all_items if item["label"] == command), None)
-    if not match:
-        return None
-
-    if not match.get("kind") == "function":
-        return None
-
-    label = match.get("label", "")
-
-    parameters = match.get("parameters", [])
-    param_lines = "\n".join(f"- `{p['name']}`: {p['desc']}" for p in parameters) or "_None_"
-
-    example_data = match.get("example", [])
-    example_md = "\n".join(f"{line}" for line in example_data)
-
-    returns_data = match.get("returns", ["None"])
-    returns_md = "\n".join(f"- {line}" for line in returns_data)
-
-    doc_md = f"""\
+    if match and match.get("kind") == "function":
+        label = match.get("label", "")
+        parameters = match.get("parameters", [])
+        param_lines = "\n".join(f"- `{p['name']}`: {p['desc']}" for p in parameters) or "_None_"
+        example_data = match.get("example", [])
+        example_md = "\n".join(f"{line}" for line in example_data)
+        returns_data = match.get("returns", ["None"])
+        returns_md = "\n".join(f"- {line}" for line in returns_data)
+        doc_md = f"""\
 ### 📘 {label}
 
-**Purpose**  
+**Purpose**
 {match.get("description", "No description available.")}
 
-**Format**  
+**Format**
 `{match.get("format", label)}`
 
-**Parameters**  
+**Parameters**
 {param_lines}
 
-**Return value**  
+**Return value**
 {returns_md}
 
-**Example**  
+**Example**
 ```tcl
 {example_md}"""
+        return lsp.Hover(lsp.MarkupContent(kind=lsp.MarkupKind.Markdown, value=doc_md))
 
-    return lsp.Hover(lsp.MarkupContent(kind=lsp.MarkupKind.Markdown, value=doc_md))
+    # 2) Otherwise, check if the token is a custom proc and show its preceding doc block
+    # Build a merged map of proc -> docs gathered during initialization and updates
+    proc_docs: dict[str, str] = {}
+    for file_docs in LSP_SERVER.proc_docs.values():
+        proc_docs.update(file_docs)
+
+    if token in proc_docs:
+        return lsp.Hover(lsp.MarkupContent(kind=lsp.MarkupKind.Markdown, value=proc_docs[token]))
+
+    return None
+
+
+@LSP_SERVER.feature(lsp.TEXT_DOCUMENT_DEFINITION)
+def goto_definition(params: lsp.DefinitionParams):
+    """Provide go-to-definition locations for Tcl procs.
+
+    Strategy:
+    - Find the token under the cursor.
+    - If it matches a custom proc collected in proc_signatures, locate its declaration
+      by searching the current document first, then other indexed files.
+    - Return a Location pointing to the proc name in its declaration line.
+    """
+    doc = LSP_SERVER.workspace.get_text_document(params.text_document.uri)
+    pos = params.position
+    try:
+        line = doc.lines[pos.line]
+    except IndexError:
+        return None
+
+    # Identify token under cursor
+    token = None
+    for m in re.finditer(r"\b\w+\b", line):
+        if m.start() <= pos.character <= m.end():
+            token = m.group(0)
+            break
+    if not token:
+        return None
+
+    # Helper to search a single source text for a proc declaration
+    def find_decl_in_source(source_text: str, uri: str) -> Optional[lsp.Location]:
+        lines = source_text.split("\n")
+        pattern = re.compile(r"^\s*proc\s+" + re.escape(token) + r"\b")
+        for i, ln in enumerate(lines):
+            m = pattern.match(ln)
+            if m:
+                start_char = ln.find(token)
+                if start_char < 0:
+                    start_char = max(m.end() - len(token), 0)
+                start = lsp.Position(i, start_char)
+                end = lsp.Position(i, start_char + len(token))
+                return lsp.Location(uri=uri, range=lsp.Range(start=start, end=end))
+        return None
+
+    # 1) Search in current document
+    loc = find_decl_in_source(doc.source, doc.uri)
+    if loc:
+        return loc
+
+    # 2) Search in indexed files from proc_signatures
+    # Build list of candidate files that declare this token as a proc
+    candidate_files: list[str] = []
+    for file_path, procs in LSP_SERVER.proc_signatures.items():
+        if token in procs:
+            candidate_files.append(file_path)
+
+    for fp in candidate_files:
+        uri = pathlib.Path(fp).as_uri()
+        # Try to get from workspace if available; else read from disk
+        try:
+            other_doc = LSP_SERVER.workspace.get_text_document(uri)
+            source = other_doc.source
+        except Exception:
+            try:
+                source = pathlib.Path(fp).read_text(encoding="utf-8")
+            except Exception:
+                continue
+        loc = find_decl_in_source(source, uri)
+        if loc:
+            return loc
+
+    return None
 
 
 # **********************************************************
@@ -398,7 +433,7 @@ def formatting(params: lsp.DocumentFormattingParams) -> list[lsp.TextEdit] | Non
 # Required Language Server Initialization and Exit handlers.
 # **********************************************************
 @LSP_SERVER.feature(lsp.WORKSPACE_DID_CHANGE_CONFIGURATION)
-def did_change_configuration(params: lsp.DidChangeConfigurationParams):
+def did_change_configuration(_: lsp.DidChangeConfigurationParams):
     """LSP Handler for Config Changes"""
 
 
@@ -418,40 +453,54 @@ def initialize(params: lsp.InitializeParams) -> lsp.InitializeResult:
     log_to_output(f"Global settings:\r\n{json.dumps(GLOBAL_SETTINGS, indent=4, ensure_ascii=False)}\r\n")
     semantic_tokens_legend = lsp.SemanticTokensLegend(
         token_types=TOKEN_TYPES,
-        token_modifiers=TokenModifier,
+        token_modifiers=[m.name for m in TokenModifier],
     )
     return lsp.InitializeResult(
         capabilities=lsp.ServerCapabilities(
             document_formatting_provider=GLOBAL_SETTINGS.get("formatter", True),
             semantic_tokens_provider=lsp.SemanticTokensOptions(legend=semantic_tokens_legend, full=True, range=False),
+            definition_provider=True,
         )
     )
 
 
 @LSP_SERVER.feature(lsp.INITIALIZED)
-def initialized(params: lsp.InitializedParams):
-    root = LSP_SERVER.workspace.root_path
-    psc_files = get_all_psc_files(pathlib.Path(root))
-    for psc_file in psc_files:
-        poco_files = read_psc_file(psc_file)
-        for sourced_layer in poco_files:
-            completion.reset()
-            try:
-                file_root = pathlib.Path(root).joinpath(sourced_layer.subfolder if sourced_layer.subfolder else "")
-                for tcl_file in sourced_layer.files:
-                    filepath = pathlib.Path(file_root).joinpath(f"{tcl_file}.tcl")
-                    if not filepath.exists():
-                        continue
+def initialized(_params: lsp.InitializedParams):
+    """Kick off background indexing to avoid blocking initialization."""
+
+    def index_workspace():
+        try:
+            root = LSP_SERVER.workspace.root_path
+            log_to_output("Background indexing started...")
+            psc_files = get_all_psc_files(pathlib.Path(root))
+            for psc_file in psc_files:
+                poco_files = read_psc_file(psc_file)
+                for sourced_layer in poco_files:
                     completion.reset()
-                    document = LSP_SERVER.workspace.get_text_document(filepath.as_uri())  # filepath.read_text(encoding="utf-8")
-                    tree = LSP_SERVER.parser.parse(document.source)
-                    tree.accept(completion, recurse=True)
-                    remove_existing_items(completion.custom_functions, LSP_SERVER.poco_completion)
-                    LSP_SERVER.poco_completion[str(filepath)] = completion.custom_functions
-                    remove_shared_keys(LSP_SERVER.proc_signatures, completion.proc_signatures)
-                    LSP_SERVER.proc_signatures[str(filepath)] = completion.proc_signatures
-            except Exception as e:
-                log_to_output(f"Fehler beim Parsen von {filepath}: {e}")
+                    try:
+                        file_root = pathlib.Path(root).joinpath(sourced_layer.subfolder if sourced_layer.subfolder else "")
+                        for tcl_file in sourced_layer.files:
+                            filepath = pathlib.Path(file_root).joinpath(f"{tcl_file}.tcl")
+                            if not filepath.exists():
+                                continue
+                            completion.reset()
+                            document = LSP_SERVER.workspace.get_text_document(filepath.as_uri())
+                            tree = LSP_SERVER.parser.parse(document.source)
+                            tree.accept(completion, recurse=True)
+                            remove_existing_items(completion.custom_functions, LSP_SERVER.poco_completion)
+                            LSP_SERVER.poco_completion[str(filepath)] = completion.custom_functions
+                            remove_shared_keys(LSP_SERVER.proc_signatures, completion.proc_signatures)
+                            LSP_SERVER.proc_signatures[str(filepath)] = completion.proc_signatures
+                            from tools.proc_docs import build_proc_docs
+
+                            LSP_SERVER.proc_docs[str(filepath)] = build_proc_docs(tree, document.source)
+                    except Exception as e:
+                        log_to_output(f"Fehler beim Parsen von {filepath}: {e}")
+            log_to_output("Background indexing completed.")
+        except Exception as e:
+            log_to_output(f"Background indexing failed: {e}")
+
+    threading.Thread(target=index_workspace, name="nxps-indexer", daemon=True).start()
 
 
 @LSP_SERVER.feature(lsp.EXIT)
@@ -474,6 +523,7 @@ def _get_global_defaults():
         "importStrategy": GLOBAL_SETTINGS.get("importStrategy", "useBundled"),
         "showNotifications": GLOBAL_SETTINGS.get("showNotifications", "off"),
         "formatter": GLOBAL_SETTINGS.get("formatter", True),
+        "inlayHint": GLOBAL_SETTINGS.get("inlayHint", True),
     }
 
 

server/src/lsp_tclserver.py

@@ -0,0 +1,173 @@
+import logging
+import pathlib
+from typing import List, Optional, Tuple
+import lsprotocol.types as lsp
+from pygls.workspace.text_document import TextDocument
+from tclint.lexer import TclSyntaxError
+from tclint.format import FormatterOpts
+from tools.formatter import NxFormatter as Formatter
+from tclint.violations import Violation
+from plugins.poco_plugin import commands
+from tools import checks, parser
+from pygls import server, uris
+from tools.completion_items import completion, remove_existing_items, remove_shared_keys
+from tools.proc_docs import build_proc_docs
+
+
+DIAGNOSTIC_SOURCE = "nx-post-support"
+
+
+class TclLanguageServer(server.LanguageServer):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.parser = parser.CustomParser()
+        for command in commands:
+            self.parser._commands.update(command)
+        self.diagnostics = {}
+        self.poco_completion: dict = {}
+        self.proc_signatures: dict = {}
+        self.proc_docs: dict = {}
+        # Cache: (uri, version) -> (tree, violations)
+        self._ast_cache = {}
+
+    def get_tree(self, document: TextDocument):
+        key = (document.uri, document.version)
+        cached = self._ast_cache.get(key)
+        if cached:
+            return cached[0]
+        # Parse and cache
+        self.parser.violations = []
+        tree = self.parser.parse(document.source)
+        violations = list(self.parser.violations)
+        self._ast_cache[key] = (tree, violations)
+        return tree
+
+    def get_tree_and_violations(self, document: TextDocument):
+        key = (document.uri, document.version)
+        cached = self._ast_cache.get(key)
+        if cached:
+            return cached
+        # Parse and cache
+        self.parser.violations = []
+        tree = self.parser.parse(document.source)
+        violations = list(self.parser.violations)
+        self._ast_cache[key] = (tree, violations)
+        return tree, violations
+
+    def clear_cache_for_uri(self, uri: str):
+        to_delete = [k for k in self._ast_cache.keys() if k[0] == uri]
+        for k in to_delete:
+            del self._ast_cache[k]
+
+    def update_poco_completion_for_file(self, document: TextDocument):
+        """Update poco_completion for a specific file when it changes"""
+        filepath = str(pathlib.Path(uris.to_fs_path(document.uri)))
+
+        # Remove existing completion items for this file
+        if filepath in self.poco_completion:
+            del self.poco_completion[filepath]
+        if filepath in self.proc_signatures:
+            del self.proc_signatures[filepath]
+        if filepath in self.proc_docs:
+            del self.proc_docs[filepath]
+
+        # Parse and extract new completion items
+        completion.reset()
+        try:
+            tree = self.get_tree(document)
+            tree.accept(completion, recurse=True)
+            remove_existing_items(completion.custom_functions, self.poco_completion)
+            self.poco_completion[filepath] = completion.custom_functions
+            remove_shared_keys(self.proc_signatures, completion.proc_signatures)
+            self.proc_signatures[filepath] = completion.proc_signatures
+            self.proc_docs[filepath] = build_proc_docs(tree, document.source)
+        except Exception as e:
+            logging.debug(f"Error parsing {filepath}: {e}")
+
+    def format(
+        self,
+        document: TextDocument,
+        options: lsp.FormattingOptions,
+        range: Optional[Tuple[int, int]] = None,
+    ):
+        # parser = Parser(command_plugins=["nx_plugins.poco_plugin.py"])
+        # parser._commands.update(commands)
+
+        indent = "\t" if not options.insert_spaces else " " * options.tab_size
+        formatter = Formatter(
+            FormatterOpts(
+                indent=indent,
+                spaces_in_braces=False,
+                max_blank_lines=500,
+                indent_namespace_eval=True,
+            ),
+        )
+
+        if range is not None:
+            start, end = range
+            return formatter.format_partial(document.source[start:end], self.parser)
+
+        return formatter.format_top(document.source, self.parser)
+
+    def linter(
+        self,
+        document: TextDocument,
+    ) -> List[Violation]:
+        tree, violations = self.get_tree_and_violations(document)
+        for checker in checks.get_checkers():
+            violations += checker.check(document.source, tree)
+        return violations
+
+    def lint(self, document: TextDocument):
+        diagnostics = []
+
+        try:
+            violations = self.linter(document)
+        except TclSyntaxError as e:
+            return [
+                lsp.Diagnostic(
+                    message=str(e),
+                    severity=lsp.DiagnosticSeverity.Error,
+                    range=lsp.Range(
+                        start=lsp.Position(e.start[0] - 1, e.start[1] - 1),
+                        end=lsp.Position(e.end[0] - 1, e.end[1] - 1),
+                    ),
+                    code="syntax error",
+                    source=DIAGNOSTIC_SOURCE,
+                )
+            ]
+
+        for violation in violations:
+            message = violation.message
+            severity = lsp.DiagnosticSeverity.Warning
+            start = lsp.Position(line=violation.start[0] - 1, character=violation.start[1] - 1)
+            end = lsp.Position(line=violation.end[0] - 1, character=violation.end[1] - 1)
+
+            diagnostics.append(
+                lsp.Diagnostic(
+                    message=message,
+                    severity=severity,
+                    range=lsp.Range(
+                        start=start,
+                        end=end,
+                    ),
+                    code=violation.id,
+                    source=DIAGNOSTIC_SOURCE,
+                )
+            )
+
+        return diagnostics
+
+    def _compute_diagnostics(self, document: TextDocument) -> List[lsp.Diagnostic]:
+        return self.lint(document)
+
+    def compute_diagnostics(self, document: TextDocument):
+        # `None` sentinel ensures that `diagnostics` gets updated if the URI is not
+        # present.
+        _, previous = self.diagnostics.get(document, (0, None))
+
+        diagnostics = self._compute_diagnostics(document)
+
+        # Only update if the list has changed
+        if previous != diagnostics:
+            self.diagnostics[document.uri] = (document.version, diagnostics)

server/src/tools/checks.py

@@ -1,11 +1,12 @@
 from enum import Enum
-from tclint.syntax_tree import Visitor, BareWord, Command
+from tclint.syntax_tree import Visitor, BareWord, Command, VarSub, QuotedWord, BracedWord
 from tclint.violations import Violation, Rule
 
 
 class Rules(Enum):
     VALIDATION = "validation"
     OPTIONAL_ARG_POSITION = "optinal_args"
+    UNDECLARED_VARIABLE = "undeclared-variable"
 
     def __str__(self):
         return self.value
@@ -21,10 +22,7 @@ class CommandArgsCheck(Visitor):
         return self._violations
 
     def visit_command(self, command: Command):
-        if (
-            not hasattr(command.routine, "contents")
-            or command.routine.contents != "proc"
-        ):
+        if not hasattr(command.routine, "contents") or command.routine.contents != "proc":
             return
         if len(command.args) < 2:
             return
@@ -51,7 +49,139 @@ class CommandArgsCheck(Visitor):
                 found_optional = True
 
 
+class UndeclaredVariableCheck(Visitor):
+    """
+    Warn when inside a proc a variable is used ($var) that is neither:
+    - declared global in the proc via `global var`, nor
+    - referenced as namespaced global (e.g. $::var), nor
+    - assigned locally in the proc via `set var ...`, nor
+    - a proc argument.
+    """
+
+    def __init__(self):
+        self._violations = []
+
+    def check(self, source, tree):
+        self._violations.clear()
+        # Traverse to find procs; inner scanning is handled per-proc
+        tree.accept(self, recurse=True)
+        return self._violations
+
+    def visit_command(self, command: Command):
+        # Only interested in procs
+        if not hasattr(command.routine, "contents"):
+            return
+        if command.routine.contents != "proc":
+            return
+        # Expect: proc <name> <args> <body>
+        if len(command.args) < 3:
+            return
+
+        proc_name_node = command.args[0]
+        args_node = command.args[1]
+        body_node = command.args[2]
+
+        # Collect proc arg names
+        arg_names = set()
+        if hasattr(args_node, "children"):
+            for child in args_node.children:
+                if isinstance(child, BareWord):
+                    if child.contents:
+                        arg_names.add(child.contents)
+                elif hasattr(child, "children") and child.children:
+                    # Defaulted arg: first element should be the arg name
+                    first = child.children[0]
+                    if hasattr(first, "contents") and first.contents:
+                        arg_names.add(first.contents)
+
+        # Two-pass scan over body: first collect locals (set) and declared globals
+        locals_set = set(arg_names)
+        declared_globals = set()
+
+        def _word_text(node) -> str | None:
+            if isinstance(node, BareWord) or isinstance(node, QuotedWord) or isinstance(node, BracedWord):
+                return node.contents
+            return getattr(node, "contents", None)
+
+        def _collect(node):
+            # Depth-first walk to collect set/global declarations
+            if isinstance(node, Command) and hasattr(node.routine, "contents"):
+                name = node.routine.contents
+                if name == "global":
+                    for an in node.args:
+                        text = _word_text(an)
+                        if text:
+                            declared_globals.add(text)
+                elif name == "set" and node.args:
+                    # set var [value] - first arg is the variable name
+                    first_arg = node.args[0]
+                    text = _word_text(first_arg)
+                    if text:
+                        base = text.split("(", 1)[0]  # Handle array syntax
+                        if not base.startswith("::"):
+                            locals_set.add(base)
+                elif name == "regsub" and node.args:
+                    # regsub ?switches? exp string subSpec ?varName?
+                    # If a varName is provided as the last arg, treat it as a local
+                    last_arg = node.args[-1]
+                    text = _word_text(last_arg)
+                    if text:
+                        base = text.split("(", 1)[0]
+                        if base and not base.startswith("::"):
+                            locals_set.add(base)
+                elif name == "foreach" and len(node.args) >= 3:
+                    # foreach varlist1 list1 ?varlist2 list2 ...? body
+                    # Treat loop variables as locals within the proc
+                    # Iterate pairs (varlist, list) over all but the last arg (body)
+                    pair_args = node.args[:-1]
+                    i = 0
+                    while i + 1 < len(pair_args):
+                        varnode = pair_args[i]
+                        text = _word_text(varnode) or ""
+                        # Split var list by whitespace if braced list, else single name
+                        names = text.split()
+                        for nm in names:
+                            base = nm.split("(", 1)[0]
+                            if base and not base.startswith("::"):
+                                locals_set.add(base)
+                        i += 2
+            # Recurse
+            for ch in getattr(node, "children", []):
+                _collect(ch)
+
+        _collect(body_node)
+
+        # Second pass: flag VarSub usages that are not accounted for
+        def _scan(node):
+            # 1) Variable substitutions like $var
+            if isinstance(node, VarSub):
+                var_name = node.value or ""
+                if var_name.startswith("::"):
+                    return
+                base = var_name
+                if base not in locals_set and base not in declared_globals:
+                    msg = f"Variable '{base}' used in proc is not set locally and not declared global; use 'global {base}' or '$::{base}'"
+                    self._violations.append(Violation(Rules.UNDECLARED_VARIABLE, msg, node.pos, node.end_pos))
+            # 2) Commands that take a variable name as first argument, e.g., 'incr var [amount]'
+            elif isinstance(node, Command) and hasattr(node.routine, "contents"):
+                if node.routine.contents == "incr" and node.args:
+                    first_arg = node.args[0]
+                    text = _word_text(first_arg) or ""
+                    base = text.split("(", 1)[0]
+                    if base and not base.startswith("::"):
+                        if base not in locals_set and base not in declared_globals:
+                            msg = f"Variable '{base}' used in proc is not set locally and not declared global; use 'global {base}'"
+                            self._violations.append(Violation(Rules.UNDECLARED_VARIABLE, msg, first_arg.pos, first_arg.end_pos))
+            for ch in getattr(node, "children", []):
+                _scan(ch)
+
+        _scan(body_node)
+
+
 def get_checkers():
-    checkers = (CommandArgsCheck(),)
+    checkers = (
+        CommandArgsCheck(),
+        UndeclaredVariableCheck(),
+    )
 
     return checkers

server/src/tools/completion_items.py

@@ -2,6 +2,8 @@ from tclint.syntax_tree import Visitor, Command, BareWord, List
 import lsprotocol.types as lsp
 from common.load_data import standard_items
 
+BUILTIN_VAR_LABELS = {ci.label for ci in standard_items.nx_variables}
+
 
 class CompletionItems:
     def __init__(self):
@@ -34,23 +36,28 @@ class _Completion(Visitor):
         self._custom_functions = []
         self._proc_signatures = {}
 
+    def _append_unique(self, item: lsp.CompletionItem):
+        # Avoid duplicate labels within the same file scan
+        if not any(ci.label == item.label for ci in self._custom_functions):
+            # For functions, attach a command to trigger signature help after completion
+            if item.kind == lsp.CompletionItemKind.Function and item.command is None:
+                item.command = lsp.Command(title="Trigger Signature Help", command="editor.action.triggerParameterHints")
+            self._custom_functions.append(item)
+
     def visit_command(self, command: Command):
         routine = command.routine
 
+        # Collect custom proc names and their signatures
         if routine.contents == "proc" and command.args:
             first_arg = command.args[0]
-            if not first_arg.value:
+            if not getattr(first_arg, "value", None):
                 return
 
             if any(item.label == first_arg.value for item in standard_items.nx_procs):
                 return
 
-            try:
-                self._custom_functions.remove(first_arg.value)
-            except ValueError:
-                pass
-
-            self._custom_functions.append(lsp.CompletionItem(label=first_arg.value, kind=lsp.CompletionItemKind.Function))
+            # Record proc name as a completion item
+            self._append_unique(lsp.CompletionItem(label=first_arg.value, kind=lsp.CompletionItemKind.Function))
             if len(command.args) < 2:
                 return
 
@@ -69,6 +76,24 @@ class _Completion(Visitor):
 
             self._proc_signatures[first_arg.value] = param_names
 
+        # Collect global variables declared with: global var1 var2 ...
+        elif routine.contents == "global" and command.args:
+            for arg in command.args:
+                if isinstance(arg, BareWord) and getattr(arg, "value", None):
+                    if arg.value not in BUILTIN_VAR_LABELS:
+                        self._append_unique(lsp.CompletionItem(label=arg.value, kind=lsp.CompletionItemKind.Variable))
+
+        # Collect variables set with explicit global namespace: set ::var_name ...
+        elif routine.contents == "set" and command.args:
+            first = command.args[0]
+            if isinstance(first, BareWord) and getattr(first, "value", None):
+                var_name = first.value
+                if var_name.startswith("::"):
+                    base_name = var_name.split("(", 1)[0]
+                    clean_name = base_name[2:]  # remove leading '::' for completion display
+                    if clean_name not in BUILTIN_VAR_LABELS:
+                        self._append_unique(lsp.CompletionItem(label=clean_name, kind=lsp.CompletionItemKind.Variable))
+
 
 def remove_existing_items(items: list[lsp.CompletionItem], store: dict) -> None:
     """

server/src/tools/document_symbols.py

@@ -0,0 +1,189 @@
+from __future__ import annotations
+
+import re
+import lsprotocol.types as lsp
+
+# Precompiled regex patterns for performance
+NS_RE = re.compile(r"^\s*namespace\s+eval\s+([^\s\{]+)")
+PROC_RE = re.compile(r"^\s*proc\s+([^\s\{]+)\s+\{.*\}\s+\{")
+SET_RE = re.compile(r"^\s*set\s+([^\s\}]+)")
+EVENT_START_RE = re.compile(r"^\s*LIB_GE_command_buffer_edit_(prepend|append|insert|replace)\b")
+EVENT_CLOSE_INLINE_RE = re.compile(r"^\s*\}\s*(\S+)\s*.*$")
+EVENT_NAME_LINE_RE = re.compile(r"^\s*([A-Za-z_][A-Za-z0-9_]*)\b")
+
+
+def build_document_symbols(source: str) -> list[lsp.DocumentSymbol]:
+    """Parse a Tcl document source and return DocumentSymbols.
+
+    This mirrors the previous inline implementation in lsp_server, but is extracted
+    for readability and reuse.
+    """
+    lines = source.split("\n")
+
+    class Scope:
+        def __init__(self, name: str, symbol: lsp.DocumentSymbol, start_line: int):
+            self.name = name
+            self.symbol = symbol
+            self.start_line = start_line
+            self.brace_count = 0
+
+    root_symbol = lsp.DocumentSymbol(
+        name="root",
+        detail="",
+        kind=lsp.SymbolKind.Namespace,
+        range=lsp.Range(start=lsp.Position(0, 0), end=lsp.Position(len(lines), 0)),
+        selection_range=lsp.Range(start=lsp.Position(0, 0), end=lsp.Position(0, 0)),
+        children=[],
+    )
+
+    scope_stack: list[Scope] = [Scope("", root_symbol, 0)]
+    pending_event: dict | None = None
+
+    for i, line in enumerate(lines):
+        # If inside an event, update its brace count for this line
+        if pending_event is not None:
+            pe_open = line.count("{")
+            pe_close = line.count("}")
+            pending_event["brace_count"] = pending_event.get("brace_count", 1) + pe_open - pe_close
+            # If this line closed the outer event block, finalize the event
+            if pending_event["brace_count"] <= 0:
+                # Try inline name on the same line
+                close_inline = EVENT_CLOSE_INLINE_RE.match(line)
+                if close_inline:
+                    event_name = close_inline.group(1)
+                    name_line_index = i
+                else:
+                    # Look ahead to next non-empty line for the name
+                    j = i + 1
+                    while j < len(lines) and lines[j].strip() == "":
+                        j += 1
+                    event_name = None
+                    name_line_index = i
+                    if j < len(lines):
+                        name_line = lines[j]
+                        name_match = EVENT_NAME_LINE_RE.match(name_line)
+                        if name_match:
+                            event_name = name_match.group(1)
+                            name_line_index = j
+                if event_name:
+                    start_line = pending_event["start"]
+                    edit_type = pending_event["edit_type"]
+                    children = pending_event.get("children", [])
+                    detail = f"Event ({edit_type})"
+                    event_symbol = lsp.DocumentSymbol(
+                        name=event_name,
+                        detail=detail,
+                        kind=lsp.SymbolKind.Event,
+                        range=lsp.Range(start=lsp.Position(start_line, 0), end=lsp.Position(name_line_index, len(lines[name_line_index]))),
+                        selection_range=lsp.Range(start=lsp.Position(name_line_index, 0), end=lsp.Position(name_line_index, len(lines[name_line_index]))),
+                        children=children or [],
+                    )
+                    if scope_stack[-1].symbol.children is None:
+                        scope_stack[-1].symbol.children = []
+                    scope_stack[-1].symbol.children.append(event_symbol)
+                # Clear event tracking and continue
+                pending_event = None
+                continue
+
+        ns_match = NS_RE.match(line)
+        proc_match = PROC_RE.match(line)
+        set_match = SET_RE.match(line)
+
+        # Namespace
+        if ns_match:
+            ns_name = ns_match.group(1)
+            start = lsp.Position(i, 0)
+            end = lsp.Position(i, len(line))
+            sel_start_char = line.find(ns_name)
+            sel_end_char = sel_start_char + len(ns_name) if sel_start_char >= 0 else len(line)
+            ns_symbol = lsp.DocumentSymbol(
+                name=ns_name,
+                detail="Namespace",
+                kind=lsp.SymbolKind.Namespace,
+                range=lsp.Range(start=start, end=end),
+                selection_range=lsp.Range(
+                    start=lsp.Position(i, max(sel_start_char, 0)),
+                    end=lsp.Position(i, max(sel_end_char, 0)),
+                ),
+                children=[],
+            )
+            scope = Scope(ns_name, ns_symbol, i)
+            if scope_stack[-1].symbol.children is None:
+                scope_stack[-1].symbol.children = []
+            scope_stack[-1].symbol.children.append(ns_symbol)
+            scope_stack.append(scope)
+
+        # Proc
+        elif proc_match:
+            proc_name = proc_match.group(1)
+            start = lsp.Position(i, 0)
+            end = lsp.Position(i, len(line))
+            sel_start_char = line.find(proc_name)
+            sel_end_char = sel_start_char + len(proc_name) if sel_start_char >= 0 else len(line)
+            proc_symbol = lsp.DocumentSymbol(
+                name=proc_name,
+                detail="Procedure",
+                kind=lsp.SymbolKind.Function,
+                range=lsp.Range(start=start, end=end),
+                selection_range=lsp.Range(
+                    start=lsp.Position(i, max(sel_start_char, 0)),
+                    end=lsp.Position(i, max(sel_end_char, 0)),
+                ),
+                children=[],
+            )
+            scope = Scope(proc_name, proc_symbol, i)
+            if scope_stack[-1].symbol.children is None:
+                scope_stack[-1].symbol.children = []
+            scope_stack[-1].symbol.children.append(proc_symbol)
+            scope_stack.append(scope)
+
+        # set variable
+        elif set_match:
+            var_name = set_match.group(1)
+            start = lsp.Position(i, 0)
+            end = lsp.Position(i, len(line))
+            sel_start_char = line.find(var_name)
+            sel_end_char = sel_start_char + len(var_name) if sel_start_char >= 0 else len(line)
+            var_symbol = lsp.DocumentSymbol(
+                name=var_name,
+                detail="Variable",
+                kind=lsp.SymbolKind.Variable,
+                range=lsp.Range(start=start, end=end),
+                selection_range=lsp.Range(
+                    start=lsp.Position(i, max(sel_start_char, 0)),
+                    end=lsp.Position(i, max(sel_end_char, 0)),
+                ),
+                children=None,
+            )
+            # Attach to current scope or pending event as child
+            if pending_event is not None:
+                pending_event["children"].append(var_symbol)
+            else:
+                if scope_stack[-1].symbol.children is None:
+                    scope_stack[-1].symbol.children = []
+                scope_stack[-1].symbol.children.append(var_symbol)
+
+        # Event start (buffer edit)
+        m = EVENT_START_RE.match(line)
+        if m:
+            edit_type = m.group(1)
+            pending_event = {"start": i, "edit_type": edit_type, "children": []}
+            continue
+
+        # Brace balancing for scopes (namespace/proc)
+        open_count = line.count("{")
+        close_count = line.count("}")
+        scope_stack[-1].brace_count += open_count - close_count
+
+        # Close finished scopes
+        while len(scope_stack) > 1 and scope_stack[-1].brace_count <= 0:
+            finished = scope_stack.pop()
+            # Set the full range from startLine to current line
+            finished.symbol.range = lsp.Range(
+                start=lsp.Position(finished.start_line, 0),
+                end=lsp.Position(i, len(line)),
+            )
+
+    # Return top-level children
+    return root_symbol.children
+

server/src/tools/formatter.py

@@ -0,0 +1,31 @@
+from tclint.format import Formatter as BaseFormatter
+from typing import List
+
+
+class NxFormatter(BaseFormatter):
+    """
+    Custom formatter that inherits from tclint's Formatter but preserves explicit
+    line continuations (\\) inside braced expressions when they span multiple lines.
+
+    This avoids generating syntax errors in environments that require a trailing
+    backslash for multi-line expressions (e.g., certain NX Post interpreters),
+    while leaving all other formatting behavior unchanged.
+    """
+
+    def format_braced_expression(self, expr) -> List[str]:  # type: ignore[override]
+        # This method mirrors BaseFormatter.format_braced_expression but inserts
+        # a line continuation (" \") between continuation lines similar to
+        # BaseFormatter.format_expression.
+        formatted = [""]
+        for child in expr.children:
+            lines = self.format(child)
+            formatted[-1] += lines[0]
+            for line in lines[1:]:
+                # add continuation on the previous line; keep next line at the same level
+                formatted[-1] += " \\"  # keep explicit continuation
+                formatted += [line]
+
+        if expr.pos[0] == expr.end_pos[0]:
+            return self._brace(formatted)
+
+        return ["{"] + self._indent(formatted, self.opts.indent) + ["}"]

server/src/tools/proc_docs.py

@@ -0,0 +1,177 @@
+import re
+from typing import Dict, List
+
+from tclint.syntax_tree import Visitor, Command
+from tools.parser import CustomParser
+
+
+def _strip_comment_prefix(line: str) -> str:
+    """Strip leading '# ' or '#' from a line."""
+    if line.lstrip().startswith("#"):
+        # remove up to one leading '#' and one optional following space
+        return re.sub(r"^\s*#\s?", "", line)
+    return line
+
+
+def extract_doc_block_above(lines: List[str], start_line_index: int) -> str | None:
+    """
+    Extract a contiguous block of line comments immediately above the given line index.
+
+    - lines: document split into lines
+    - start_line_index: 0-based index of the line where the proc command starts
+
+    Returns the cleaned documentation text or None if no comment block found.
+    """
+    i = start_line_index - 1
+    if i < 0:
+        return None
+
+    doc_lines: List[str] = []
+
+    # Skip trailing empty lines directly above
+    while i >= 0 and lines[i].strip() == "":
+        i -= 1
+
+    # Collect contiguous comment lines going upwards
+    while i >= 0 and lines[i].lstrip().startswith("#"):
+        doc_lines.append(lines[i])
+        i -= 1
+
+    if not doc_lines:
+        return None
+
+    # Reverse to original order and strip comment prefixes
+    doc_lines.reverse()
+    cleaned = [_strip_comment_prefix(line_text) for line_text in doc_lines]
+
+    # Simple tag -> markdown conversions for nicer rendering
+    md_lines: List[str] = []
+    tag_map = {
+        "<Documentation>": "### Documentation",
+        "<Arguments>": "### Arguments",
+        "<Returnvalue>": "### Return value",
+        "<Example>": "### Example",
+        "<Internal Documentation>": "### Internal Documentation",
+        "<Internal Example>": "### Internal Example",
+    }
+
+    in_example = False
+    code_block_open = False
+
+    def close_code_block_if_open():
+        nonlocal code_block_open
+        if code_block_open:
+            md_lines.append("```")
+            code_block_open = False
+
+    for line in cleaned:
+        stripped = line.strip()
+        # Convert tags to headings and manage example sections
+        if stripped in tag_map:
+            # If we hit any new tag, close a pending code block
+            close_code_block_if_open()
+            heading = tag_map[stripped]
+            md_lines.append(heading)
+            in_example = heading in ("### Example", "### Internal Example")
+            continue
+
+        if in_example:
+            low = stripped.lower()
+            if low.startswith("code:"):
+                # Open code block if needed and append the code content
+                code_text = line.split(":", 1)[1].strip()
+                if not code_block_open:
+                    md_lines.append("```tcl")
+                    code_block_open = True
+                md_lines.append(code_text)
+                continue
+            # Keep name/desc lines as regular text outside code
+            if low.startswith("name:") or low.startswith("desc:"):
+                md_lines.append(line)
+                continue
+
+        md_lines.append(line)
+
+    # Close any dangling code fence at the end of the block
+    close_code_block_if_open()
+
+    return "\n".join(md_lines).rstrip()
+
+
+class ProcDocExtractor(Visitor):
+    """Visitor that collects documentation blocks above proc declarations."""
+
+    def __init__(self, source_text: str):
+        super().__init__()
+        self._lines = source_text.split("\n")
+        self.docs: Dict[str, str] = {}
+
+    def visit_command(self, command: Command):
+        routine = getattr(command.routine, "contents", None)
+        if routine != "proc":
+            return
+
+        if not command.args:
+            return
+        name_node = command.args[0]
+        proc_name = getattr(name_node, "contents", None)
+        if not proc_name:
+            return
+
+        # Prefer line of the 'proc' keyword; fallback to the name node
+        pos = getattr(command.routine, "pos", None) or getattr(name_node, "pos", None)
+        if not pos:
+            return
+        line_idx = pos[0] - 1  # 0-based
+        block = extract_doc_block_above(self._lines, line_idx)
+        if block:
+            self.docs[proc_name] = block
+
+
+def build_proc_docs(tree, source_text: str) -> Dict[str, str]:
+    """Build a mapping of proc name -> markdown doc from a parsed tree and source text."""
+    extractor = ProcDocExtractor(source_text)
+    tree.accept(extractor, recurse=True)
+    return extractor.docs
+
+
+def is_proc_declaration_position(source_text: str, line_zero_based: int, char_zero_based: int) -> bool:
+    """Return True if the position is on a proc name within its declaration."""
+    parser = CustomParser()
+    tree = parser.parse(source_text)
+
+    # Walk commands to find 'proc' declarations and check if position intersects the name arg
+    class _DeclFinder(Visitor):
+        def __init__(self):
+            self.is_decl = False
+
+        def visit_command(self, command: Command):
+            if self.is_decl:
+                return
+            routine = getattr(command.routine, "contents", None)
+            if routine != "proc" or not command.args:
+                return
+            name_node = command.args[0]
+            if not hasattr(name_node, "pos"):
+                return
+            # Calculate range for the name token
+            try:
+                start_line, start_col = name_node.pos
+                end_line, end_col = getattr(name_node, "end_pos", name_node.pos)
+            except Exception:
+                return
+            if start_line - 1 == line_zero_based:
+                length = 0
+                if hasattr(name_node, "value") and name_node.value is not None:
+                    length = len(name_node.value)
+                elif hasattr(name_node, "contents") and name_node.contents is not None:
+                    length = len(name_node.contents)
+                if length:
+                    start_c = start_col - 1
+                    end_c = start_c + length
+                    if start_c <= char_zero_based <= end_c:
+                        self.is_decl = True
+
+    finder = _DeclFinder()
+    tree.accept(finder, recurse=True)
+    return finder.is_decl

server/src/tools/semantic_tokens.py

@@ -1,10 +1,9 @@
 import enum
 from typing import List
-from tclint.syntax_tree import Visitor, QuotedWord, Command, BareWord
+from tclint.syntax_tree import Visitor, QuotedWord, Command, BareWord, VarSub
 from tclint.commands import get_commands
 import attrs
 from common.load_data import standard_items
-from tools.completion_items import completion
 import lsprotocol.types as lsp
 
 
@@ -15,6 +14,9 @@ class TokenModifier(enum.IntFlag):
     definition = enum.auto()
     declaration = enum.auto()
     builtin = enum.auto()
+    globalvar = enum.auto()
+    reference = enum.auto()
+    write = enum.auto()
 
 
 @attrs.define
@@ -26,6 +28,11 @@ class Token:
     tok_type: str = ""
     tok_modifiers: List[TokenModifier] = attrs.field(factory=list)
 
+    @property
+    def length(self) -> int:
+        """Compatibility alias for misspelled 'lenght' field."""
+        return self.lenght
+
 
 TOKEN_TYPES = [
     "keyword",
@@ -81,19 +88,33 @@ class _Highlighter(Visitor):
         pass
 
     def visit_bare_word(self, word: BareWord):
-        name = word.value
-
-        in_standard = any(item.label == name for item in standard_items.nx_procs)
-
-        in_custom = any(item.label == name for items in self.custom_functions.values() for item in items)
-
-        if in_standard or in_custom:
-            line, col = word.pos
-            self._tokens.append((((line - 1, col - 1), len(name), "function", [])))
+        # Intentionally do not classify bare words as functions here.
+        # Function highlighting is handled in visit_command for the routine only,
+        # using completion items (custom functions) as the source of truth.
+        return
 
     def visit_command(self, command: Command):
         routine = command.routine
 
+        # Highlight functions (custom or standard) when used as the routine
+        name = getattr(routine, "contents", None)
+        if name:
+            in_custom = any(item.label == name for items in self.custom_functions.values() for item in items)
+            in_standard = any(item.label == name for item in standard_items.nx_procs)
+            if in_custom or in_standard:
+                line, col = routine.contents_pos
+                self._tokens.append((((line - 1, col - 1), len(name), "function", [])))
+            # Highlight 'global' itself as a keyword
+            if name == "global":
+                line, col = routine.contents_pos
+                self._tokens.append((((line - 1, col - 1), len(name), "keyword", [])))
+                first_arg = command.args[0]
+                token_info = self._get_token_info(first_arg)
+                if token_info:
+                    (line, col), length = token_info
+                    mods = [TokenModifier.declaration, TokenModifier.write]
+                    self._tokens.append(((line, col), length, "variable", mods))
+
         if routine.contents == "puts":
             line, col = routine.contents_pos
             self._tokens.append(
@@ -106,21 +127,34 @@ class _Highlighter(Visitor):
                     )
                 )
             )
+        # Variable declaration vs reference for 'set'
         if routine.contents == "set" and command.args:
             first_arg = command.args[0]
             token_info = self._get_token_info(first_arg)
             if token_info:
                 (line, col), length = token_info
-                self._tokens.append(
-                    (
-                        (
-                            (line, col),
-                            length,
-                            "variable",
-                            [TokenModifier.declaration],
-                        )
-                    )
-                )
+                mods = [TokenModifier.declaration, TokenModifier.write]
+                self._tokens.append(((line, col), length, "variable", mods))
+            # If there is exactly one argument, 'set var' is a read/reference
+            if len(command.args) == 1 and token_info:
+                (line, col), length = token_info
+                mods = [TokenModifier.reference]
+                self._tokens.append(((line, col), length, "variable", mods))
+        # Variable modification via 'incr var [amount]'
+        if routine.contents == "incr" and command.args:
+            first_arg = command.args[0]
+            token_info = self._get_token_info(first_arg)
+            if token_info:
+                (line, col), length = token_info
+                mods = [TokenModifier.write]
+                # Add global flag if explicitly namespaced
+                try:
+                    name_text = getattr(first_arg, "value", None) or getattr(first_arg, "contents", None) or ""
+                    if isinstance(name_text, str) and name_text.startswith("::"):
+                        mods.append(TokenModifier.globalvar)
+                except Exception:
+                    pass
+                self._tokens.append(((line, col), length, "variable", mods))
         if routine.contents == "proc" and command.args:
             first_arg = command.args[0]
             if hasattr(first_arg, "pos") and hasattr(first_arg, "value"):
@@ -145,11 +179,12 @@ class _Highlighter(Visitor):
                         # Parameter kann einfaches Wort sein
                         if hasattr(child, "value") and child.value is not None:
                             line, col = child.pos
+                            # Parameters are variables (locals): mark as variable with declaration
                             self._tokens.append(
                                 (
                                     (line - 1, col - 1),
                                     len(child.value),
-                                    "parameter",
+                                    "variable",
                                     [TokenModifier.declaration],
                                 )
                             )
@@ -163,7 +198,7 @@ class _Highlighter(Visitor):
                                     (
                                         (line - 1, col - 1),
                                         len(name_node.value),
-                                        "parameter",
+                                        "variable",
                                         [TokenModifier.declaration],
                                     )
                                 )
@@ -173,6 +208,17 @@ class _Highlighter(Visitor):
                 line, col = first_arg.pos
                 self._tokens.append((((line - 1, col - 1), len(first_arg.value), "class", [])))
 
+        # Highlight variables used via $var and $::var as references (read)
+        for arg in getattr(command, "args", []):
+            for child in getattr(arg, "children", []):
+                if isinstance(child, VarSub) and hasattr(child, "pos") and child.value:
+                    line, col = child.pos
+                    # Determine if this looks like a global reference ($::var)
+                    mods = [TokenModifier.reference]
+                    if child.value.startswith("::"):
+                        mods.append(TokenModifier.globalvar)
+                    self._tokens.append((((line - 1, col - 1), len(child.value), "variable", mods)))
+
     def tokens(self) -> list[Token]:
         """Encode tokens as described in
         https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_semanticTokens.

server/src/tools/signature_help.py

@@ -0,0 +1,104 @@
+from __future__ import annotations
+
+from typing import Dict, List, Optional, Tuple
+import lsprotocol.types as lsp
+from tclint.syntax_tree import Visitor, Command, Node
+
+
+class _CommandAtPositionFinder(Visitor):
+    def __init__(self, line1: int, col1: int, lines: list[str]):
+        # Cursor position in 1-based line/col to match AST
+        self.line1 = line1
+        self.col1 = col1
+        self.lines = lines
+        self.match: Optional[Command] = None
+
+    def _pos_le(self, a: Tuple[int, int] | None, b: Tuple[int, int] | None) -> bool:
+        if a is None or b is None:
+            return False
+        return a[0] < b[0] or (a[0] == b[0] and a[1] <= b[1])
+
+    def _pos_ge(self, a: Tuple[int, int] | None, b: Tuple[int, int] | None) -> bool:
+        if a is None or b is None:
+            return False
+        return a[0] > b[0] or (a[0] == b[0] and a[1] >= b[1])
+
+    def _contains_or_trailing(self, node: Node) -> bool:
+        # Standard containment
+        if self._pos_le(node.pos, (self.line1, self.col1)) and self._pos_ge(node.end_pos, (self.line1, self.col1)):
+            return True
+        # Extend containment to trailing whitespace on same line as the command end
+        if getattr(node, "end_pos", None) and node.end_pos and node.end_pos[0] == self.line1 and self.col1 >= node.end_pos[1]:
+            try:
+                line = self.lines[self.line1 - 1]
+            except Exception:
+                line = ""
+            start = max(0, node.end_pos[1] - 1)
+            end = max(0, min(len(line), self.col1 - 1))
+            segment = line[start:end]
+            # If there is a command terminator (';' or ']') between end_pos and cursor, do not extend
+            if ";" not in segment and "]" not in segment:
+                return True
+        return False
+
+    def visit_command(self, command: Command):
+        if hasattr(command, "pos") and hasattr(command, "end_pos") and self._contains_or_trailing(command):
+            # Prefer the deepest command: overwrite and continue
+            self.match = command
+        # Continue traversal
+        for ch in getattr(command, "children", []):
+            ch.accept(self, recurse=True)
+
+
+def _compute_active_parameter(cmd: Command, line1: int, col1: int) -> int:
+    # Count which arg contains the cursor; else number of args before cursor
+    for idx, arg in enumerate(getattr(cmd, "args", []) or []):
+        if getattr(arg, "pos", None) and getattr(arg, "end_pos", None):
+            if (arg.pos[0] < line1 or (arg.pos[0] == line1 and arg.pos[1] <= col1)) and (arg.end_pos[0] > line1 or (arg.end_pos[0] == line1 and arg.end_pos[1] >= col1)):
+                return idx
+    # Not inside any arg; compute based on separator position
+    count = 0
+    for arg in getattr(cmd, "args", []) or []:
+        if getattr(arg, "end_pos", None):
+            if arg.end_pos[0] < line1 or (arg.end_pos[0] == line1 and arg.end_pos[1] <= col1):
+                count += 1
+    return min(count, max(0, len(getattr(cmd, "args", [])) - 1))
+
+
+def get_signature_help(
+    document_text: str,
+    tree,
+    merged_signatures: Dict[str, List[str]],
+    position: lsp.Position,
+) -> Optional[lsp.SignatureHelp]:
+    # Convert to 1-based coordinates expected by AST
+    line1 = position.line + 1
+    col1 = position.character + 1
+
+    # Find the innermost command that contains the position
+    # Pass lines for trailing-space containment handling
+    lines = document_text.splitlines()
+    finder = _CommandAtPositionFinder(line1, col1, lines)
+    tree.accept(finder, recurse=True)
+    cmd = finder.match
+    if not cmd or not hasattr(cmd, "routine") or not hasattr(cmd.routine, "contents"):
+        return None
+
+    routine_name = cmd.routine.contents
+    if not routine_name:
+        return None
+
+    params = merged_signatures.get(routine_name)
+    if not params:
+        # No known signature for this routine
+        return None
+
+    # Build a signature info
+    label = f"{routine_name}({', '.join(params)})"
+    parameters = [lsp.ParameterInformation(label=p) for p in params]
+
+    active_param = _compute_active_parameter(cmd, line1, col1)
+    active_param = max(0, min(active_param, len(params) - 1))
+
+    sig = lsp.SignatureInformation(label=label, parameters=parameters)
+    return lsp.SignatureHelp(signatures=[sig], active_signature=0, active_parameter=active_param)

server/src/tools/variable_index.py

@@ -0,0 +1,100 @@
+import re
+from dataclasses import dataclass
+from typing import Dict, Set, List, Tuple
+
+# Reuse patterns similar to document_symbols
+NS_RE = re.compile(r"^\s*namespace\s+eval\s+([^\s\{]+)")
+PROC_RE = re.compile(r"^\s*proc\s+([^\s\{]+)\s+\{.*\}\s+\{")
+SET_RE = re.compile(r"^\s*set\s+([^\s\}]+)")
+
+
+@dataclass
+class ProcRange:
+    name: str
+    start_line: int
+    end_line: int | None = None
+
+
+def build_variable_index(source: str) -> tuple[Set[str], Dict[str, Set[str]], List[ProcRange]]:
+    """
+    Parse Tcl source text and build:
+    - globals: set of variable names considered global suggestions
+    - procs: mapping proc_name -> set of local variable names (set without :: inside that proc)
+    - proc_ranges: list of ProcRange (name, start_line, end_line)
+
+    Rules:
+    - set ::var -> global var suggestion (strip leading :: and any array index "(")
+    - set var without :: at top level (not in namespace/proc) -> global suggestion
+    - set var without :: inside proc -> local to that proc
+    - set var inside namespace (no ::) is ignored for global suggestions
+    """
+    lines = source.split("\n")
+
+    class Scope:
+        def __init__(self, name: str, kind: str, start_line: int):
+            self.name = name
+            self.kind = kind  # "namespace" or "proc" or "root"
+            self.start_line = start_line
+            self.brace_count = 0
+
+    globals_set: Set[str] = set()
+    procs: Dict[str, Set[str]] = {}
+    proc_ranges: List[ProcRange] = []
+
+    scope_stack: List[Scope] = [Scope("", "root", 0)]
+
+    for i, line in enumerate(lines):
+        ns_match = NS_RE.match(line)
+        proc_match = PROC_RE.match(line)
+        set_match = SET_RE.match(line)
+
+        # Namespace scope
+        if ns_match:
+            scope_stack.append(Scope(ns_match.group(1), "namespace", i))
+
+        # Proc scope
+        elif proc_match:
+            pname = proc_match.group(1)
+            scope_stack.append(Scope(pname, "proc", i))
+            proc_ranges.append(ProcRange(name=pname, start_line=i, end_line=None))
+
+        # Track set statements
+        if set_match:
+            raw_name = set_match.group(1)
+            # Normalize array names and leading ::
+            base = raw_name.split("(", 1)[0]
+            if base.startswith("::"):
+                clean = base[2:]
+                globals_set.add(clean)
+            else:
+                top = scope_stack[-1]
+                if top.kind == "root":
+                    globals_set.add(base)
+                elif top.kind == "proc":
+                    procs.setdefault(top.name, set()).add(base)
+                else:
+                    # inside namespace without :: -> ignore for globals
+                    pass
+
+        # Brace balancing for current top scope
+        open_count = line.count("{")
+        close_count = line.count("}")
+        scope_stack[-1].brace_count += open_count - close_count
+
+        # Close finished scopes
+        while len(scope_stack) > 1 and scope_stack[-1].brace_count <= 0:
+            finished = scope_stack.pop()
+            if finished.kind == "proc":
+                # Update the last matching proc range end_line
+                for pr in reversed(proc_ranges):
+                    if pr.name == finished.name and pr.end_line is None:
+                        pr.end_line = i
+                        break
+
+    # Finalize any unterminated proc ranges
+    for pr in proc_ranges:
+        if pr.end_line is None:
+            pr.end_line = len(lines) - 1
+
+    return globals_set, procs, proc_ranges
+

server/tests/python_tests/test_document_symbols.py

@@ -0,0 +1,115 @@
+import sys
+from pathlib import Path
+
+THIS_DIR = Path(__file__).parent
+SRC_DIR = THIS_DIR.parent.parent / "src"
+if str(SRC_DIR) not in sys.path:
+    sys.path.insert(0, str(SRC_DIR))
+
+import lsprotocol.types as lsp  # type: ignore
+from lsp_server import LSP_SERVER, document_symbols  # type: ignore
+
+
+def test_document_symbols_namespace_proc_set_hierarchy(tmp_path: Path):
+    source_lines = [
+        "set top_var 1",
+        "namespace eval myns {",
+        "    set ns_var 2",
+        "    proc add {a b} {",
+        "        set sum [expr {$a + $b}]",
+        "        return $sum",
+        "    }",
+        "}",
+        "proc top_proc {} {",
+        "    set x 3",
+        "}",
+    ]
+    source = "\n".join(source_lines)
+
+    uri = Path(tmp_path / "sym.tcl").as_uri()
+    # Put a text document into the workspace
+    LSP_SERVER.workspace.put_text_document(lsp.TextDocumentItem(uri=uri, language_id="tcl", version=1, text=source))
+
+    # Request document symbols
+    params = lsp.DocumentSymbolParams(text_document=lsp.TextDocumentIdentifier(uri=uri))
+    symbols = document_symbols(params)
+
+    # Expect at least 2 top-level children: root contains 'set top_var' (variable) and 'namespace myns' and 'proc top_proc'
+    names_kinds = {(s.name, s.kind) for s in symbols}
+    assert ("root", lsp.SymbolKind.Namespace) not in names_kinds  # root should not be included itself
+
+    # Find namespace symbol
+    ns = next(s for s in symbols if s.name == "myns")
+    assert ns.kind == lsp.SymbolKind.Namespace
+    assert ns.children is not None
+
+    # Inside namespace: has variable and proc
+    child_names = {c.name for c in ns.children}
+    assert "ns_var" in child_names
+    assert "add" in child_names
+
+    # top-level variable and proc also present
+    top_names = {s.name for s in symbols}
+    assert "top_var" in top_names
+    assert "top_proc" in top_names
+
+    # Check that proc add has no children (we're not extracting params as children here)
+    add = next(c for c in ns.children if c.name == "add")
+    assert add.kind == lsp.SymbolKind.Function
+    assert add.children == []
+
+
+def test_buffer_edit_events_are_symbols_with_type_and_name(tmp_path: Path):
+    source_lines = [
+        "LIB_GE_command_buffer_edit_insert LIB_ROTARY_positioning_first_move_pos ROTARY_POSITIONING_FIRST_MOVE_POS {",
+        "    MOM_enable_address Z M_coolant_off D M_coolant_1 M_coolant_2 H_pressure",
+        "}",
+        " Coolant after @DECOMPOSEZUL",
+        "",
+        "LIB_GE_command_buffer_edit_append MOM_start_of_path_LIB MOM_start_of_path_LIB_ENTRY_end {",
+        "    MOM_force once M_coolant_1 M_coolant_2 H_pressure",
+        "}",
+        " force_coolant",
+    ]
+    source = "\n".join(source_lines)
+
+    uri = Path(tmp_path / "events.tcl").as_uri()
+    LSP_SERVER.workspace.put_text_document(lsp.TextDocumentItem(uri=uri, language_id="tcl", version=1, text=source))
+    params = lsp.DocumentSymbolParams(text_document=lsp.TextDocumentIdentifier(uri=uri))
+    symbols = document_symbols(params)
+
+    # Find event symbols
+    events = [s for s in symbols if s.kind == lsp.SymbolKind.Event]
+    assert events, "Expected at least one event symbol"
+
+    # Verify names and details
+    names = [e.name for e in events]
+    assert "Coolant" in names or "force_coolant" in names
+    for e in events:
+        assert e.detail.startswith("Event (")
+
+
+def test_event_children_include_set_variable(tmp_path: Path):
+    source_lines = [
+        "LIB_GE_command_buffer_edit_append MOM_rapid_move_LIB MOM_rapid_move_LIB_ENTRY_start {",
+        "    if {[info exists ::mom_lift_off_output] && $::kapp_vars(retract_start) == 0} {",
+        "        kapp_retract_subpgm",
+        "    }",
+        "    set ::kapp_vars(retract_start) 0",
+        "}",
+        " KappRetractSubPgm",
+    ]
+    source = "\n".join(source_lines)
+
+    uri = Path(tmp_path / "event_children.tcl").as_uri()
+    LSP_SERVER.workspace.put_text_document(lsp.TextDocumentItem(uri=uri, language_id="tcl", version=1, text=source))
+    params = lsp.DocumentSymbolParams(text_document=lsp.TextDocumentIdentifier(uri=uri))
+    symbols = document_symbols(params)
+
+    events = [s for s in symbols if s.kind == lsp.SymbolKind.Event and s.name == "KappRetractSubPgm"]
+    assert events, "Expected event symbol for KappRetractSubPgm"
+    ev = events[0]
+    assert ev.children is not None
+    # Ensure the set variable is a child of the event
+    child_names = {c.name for c in ev.children}
+    assert "::kapp_vars(retract_start)" in child_names

server/tests/python_tests/test_goto_definition.py

@@ -0,0 +1,116 @@
+import sys
+from pathlib import Path
+
+# Ensure server/src is on the path for imports
+THIS_DIR = Path(__file__).parent
+SRC_DIR = THIS_DIR.parent.parent / "src"
+if str(SRC_DIR) not in sys.path:
+    sys.path.insert(0, str(SRC_DIR))
+
+import lsprotocol.types as lsp  # type: ignore
+from lsp_server import LSP_SERVER, goto_definition  # type: ignore
+
+
+def _loc_to_tuple(loc: lsp.Location) -> tuple[str, int, int, int, int]:
+    """Helper to normalize Location into a tuple for easy asserts."""
+    return (
+        loc.uri,
+        loc.range.start.line,
+        loc.range.start.character,
+        loc.range.end.line,
+        loc.range.end.character,
+    )
+
+
+def _extract_first_location(result) -> lsp.Location | None:
+    if result is None:
+        return None
+    if isinstance(result, list):
+        return result[0] if result else None
+    return result
+
+
+def test_goto_definition_same_file(tmp_path: Path):
+    source_lines = [
+        "proc add {a b} {",
+        "    return [expr {$a + $b}]",
+        "}",
+        "",
+        "set x [add 1 2]",
+    ]
+    source = "\n".join(source_lines)
+
+    uri = Path(tmp_path / "same.tcl").as_uri()
+    # Put a text document into the workspace
+    LSP_SERVER.workspace.put_text_document(
+        lsp.TextDocumentItem(uri=uri, language_id="tcl", version=1, text=source)
+    )
+
+    # Position on the word 'add' in the last line
+    line_idx = 4
+    char_idx = source_lines[line_idx].index("add") + 1  # somewhere inside token
+
+    params = lsp.DefinitionParams(
+        text_document=lsp.TextDocumentIdentifier(uri=uri),
+        position=lsp.Position(line=line_idx, character=char_idx),
+    )
+
+    result = goto_definition(params)
+    loc = _extract_first_location(result)
+
+    assert loc is not None
+    assert loc.uri == uri
+    # Definition should be on line 0 at the token 'add'
+    start = loc.range.start
+    end = loc.range.end
+    assert start.line == 0
+    assert end.line == 0
+    assert source_lines[0][start.character : end.character] == "add"
+
+
+def test_goto_definition_cross_file(tmp_path: Path):
+    # File A declares the proc
+    a_lines = [
+        "proc myproc {arg} {",
+        "    return $arg",
+        "}",
+    ]
+    a_src = "\n".join(a_lines)
+    a_path = tmp_path / "a.tcl"
+    a_uri = a_path.as_uri()
+    LSP_SERVER.workspace.put_text_document(
+        lsp.TextDocumentItem(uri=a_uri, language_id="tcl", version=1, text=a_src)
+    )
+
+    # Update indices for file A so proc_signatures gets populated
+    doc_a = LSP_SERVER.workspace.get_text_document(a_uri)
+    LSP_SERVER.update_poco_completion_for_file(doc_a)
+
+    # File B calls the proc
+    b_lines = [
+        "set y [myproc 42]",
+    ]
+    b_src = "\n".join(b_lines)
+    b_uri = (tmp_path / "b.tcl").as_uri()
+    LSP_SERVER.workspace.put_text_document(
+        lsp.TextDocumentItem(uri=b_uri, language_id="tcl", version=1, text=b_src)
+    )
+
+    call_line = 0
+    call_char = b_lines[0].index("myproc") + 2
+
+    params = lsp.DefinitionParams(
+        text_document=lsp.TextDocumentIdentifier(uri=b_uri),
+        position=lsp.Position(line=call_line, character=call_char),
+    )
+
+    result = goto_definition(params)
+    loc = _extract_first_location(result)
+
+    assert loc is not None
+    assert loc.uri == a_uri
+    start = loc.range.start
+    end = loc.range.end
+    assert start.line == 0
+    assert a_lines[start.line][start.character : end.character] == "myproc"
+

server/tests/python_tests/test_hover_proc_docs.py

@@ -0,0 +1,103 @@
+import os
+import sys
+from pathlib import Path
+
+# Ensure server/src is on the path for imports
+THIS_DIR = Path(__file__).parent
+SRC_DIR = THIS_DIR.parent.parent / "src"
+if str(SRC_DIR) not in sys.path:
+    sys.path.insert(0, str(SRC_DIR))
+
+import lsprotocol.types as lsp  # type: ignore
+from tools.proc_docs import build_proc_docs, is_proc_declaration_position
+from lsp_server import LSP_SERVER, hover  # type: ignore
+
+
+def test_build_proc_docs_extracts_block_and_tags():
+    source = (
+        "#____________________________________________________________________________________________\n"
+        "# <Documentation>\n"
+        "# This procedure creates a new directory if it does not exist.\n"
+        "# <Arguments>\n"
+        "# directory\n"
+        "#\tThe full pathname of the directory to be created.\n"
+        "# <Returnvalue>\n"
+        "# 0 - directory created or already exists\n"
+        "# 1 - error\n"
+        "#______________________________________________________________________________________________\n"
+        "proc LIB_FH_create_directory {directory} {\n"
+        "    return 0\n"
+        "}\n"
+    )
+
+    from tools.parser import CustomParser
+
+    tree = CustomParser().parse(source)
+    docs = build_proc_docs(tree, source)
+
+    assert "LIB_FH_create_directory" in docs
+    md = docs["LIB_FH_create_directory"]
+    # Tags become markdown headings
+    assert "### Documentation" in md
+    assert "### Arguments" in md
+    assert "### Return value" in md
+    # Content preserved
+    assert "creates a new directory" in md
+
+
+def test_hover_shows_doc_on_usage_but_not_on_declaration(tmp_path: Path):
+    # Build a TCL file with a documented proc and a usage
+    source_lines = [
+        "#_________________________________________________________________________________________________",
+        "# <Documentation>",
+        "# Function to delete the file",
+        "#_________________________________________________________________________________________________",
+        "proc SERVICE_remove_file {file} {",
+        "    if {![SERVICE_check_file_exists $file]} {return}",
+        "    MOM_remove_file $file",
+        "}",
+        "",
+        "proc SERVICE_check_file_exists {file} {",
+        "    if {[file exists $file]} {return 1}",
+        "    return 0",
+        "}",
+        "",
+        "# usage below",
+        "SERVICE_remove_file \"C:/tmp/x\"",
+    ]
+    source = "\n".join(source_lines)
+
+    # Register document with server
+    uri = Path(tmp_path / "test.tcl").as_uri()
+    LSP_SERVER.workspace.put_text_document(
+        lsp.TextDocumentItem(uri=uri, language_id="tcl", version=1, text=source)
+    )
+
+    # Force server to parse and build proc docs
+    doc = LSP_SERVER.workspace.get_text_document(uri)
+    LSP_SERVER.update_poco_completion_for_file(doc)
+
+    # 1) Hover on usage -> should return docs
+    usage_line = source_lines.index("SERVICE_remove_file \"C:/tmp/x\"")
+    char_index = source_lines[usage_line].find("SERVICE_remove_file") + 5  # inside the token
+
+    params = lsp.HoverParams(
+        text_document=lsp.TextDocumentIdentifier(uri=uri),
+        position=lsp.Position(line=usage_line, character=char_index),
+    )
+    result = hover(params)
+    assert result is not None
+    assert "Function to delete the file" in result.contents.value  # type: ignore[attr-defined]
+
+    # 2) Hover on declaration name -> should be None
+    decl_line = source_lines.index("proc SERVICE_remove_file {file} {")
+    decl_char = source_lines[decl_line].find("SERVICE_remove_file") + 2
+    assert is_proc_declaration_position(source, decl_line, decl_char)
+
+    params_decl = lsp.HoverParams(
+        text_document=lsp.TextDocumentIdentifier(uri=uri),
+        position=lsp.Position(line=decl_line, character=decl_char),
+    )
+    none_result = hover(params_decl)
+    assert none_result is None
+

server/tests/python_tests/test_proc_docs.py

@@ -0,0 +1,75 @@
+import sys
+from pathlib import Path
+
+# Ensure server/src is on sys.path for imports
+THIS_DIR = Path(__file__).parent
+SRC_DIR = THIS_DIR.parent.parent / "src"
+if str(SRC_DIR) not in sys.path:
+    sys.path.insert(0, str(SRC_DIR))
+
+import lsprotocol.types as lsp  # type: ignore
+from tools.parser import CustomParser
+from tools.proc_docs import build_proc_docs
+
+
+def test_example_is_marked_as_tcl_code_block():
+    source_lines = [
+        "#____________________________________________________________________________________________",
+        "# <Documentation>",
+        "# This procedure creates a new directory if it does not exist.",
+        "# <Arguments>",
+        "# directory",
+        "#\tThe full pathname of the directory to be created.",
+        "# <Returnvalue>",
+        "# 0 - directory created or already exists",
+        "# 1 - error",
+        "# <Example>",
+        "# name: Example 1",
+        "# code: LIB_FH_create_directory \"C:/Temp/Test\"",
+        "# desc: If error = 0, the directory is created.",
+        "proc LIB_FH_create_directory {directory} {",
+        "    return 0",
+        "}",
+    ]
+    source = "\n".join(source_lines)
+
+    tree = CustomParser().parse(source)
+    docs = build_proc_docs(tree, source)
+
+    assert "LIB_FH_create_directory" in docs
+    md = docs["LIB_FH_create_directory"]
+
+    # Headings preserved
+    assert "### Documentation" in md
+    assert "### Arguments" in md
+    assert "### Return value" in md
+    assert "### Example" in md
+
+    # Code fence with tcl language hint and the code line present
+    assert "```tcl" in md
+    assert "LIB_FH_create_directory \"C:/Temp/Test\"" in md
+    assert md.strip().endswith("```")
+
+
+def test_internal_example_is_marked_as_tcl_code_block():
+    source_lines = [
+        "# <Internal Documentation>",
+        "# Helper utility",
+        "# <Internal Example>",
+        "# code: puts \"hello\"",
+        "proc helper {} {",
+        "    return",
+        "}",
+    ]
+    source = "\n".join(source_lines)
+
+    tree = CustomParser().parse(source)
+    docs = build_proc_docs(tree, source)
+
+    assert "helper" in docs
+    md = docs["helper"]
+
+    assert "### Internal Documentation" in md
+    assert "### Internal Example" in md
+    assert "```tcl" in md and "puts \"hello\"" in md and md.strip().endswith("```")
+

syntaxes/tcl.tmLanguage.json

@@ -1,30 +1,19 @@
 {
-    "fileTypes": [
-        "tcl"
-    ],
+    "fileTypes": [ "tcl" ],
     "name": "tcl",
     "patterns": [
-        {
-            "include": "#main"
-        }
+        { "include": "#main" }
     ],
     "scopeName": "source.tcl",
+    "uuid": "c7017136-2ff2-48e9-bdb0-570cf238b4a2",
     "repository": {
         "main": {
-            "patterns": [
-                {
-                    "include": "#command"
-                }
-            ]
+            "patterns": [ { "include": "#command" } ]
         },
         "args": {
             "patterns": [
-                {
-                    "include": "#quoted_args"
-                },
-                {
-                    "include": "#numeric"
-                },
+                { "include": "#quoted_args" },
+                { "include": "#numeric" },
                 {
                     "match": "((?<=;)\\s*#.*$)",
                     "name": "comment.tcl",
@@ -36,22 +25,10 @@
             "patterns": [
                 {
                     "begin": "((?<!\\\\)\\{)",
-                    "beginCaptures": {
-                        "1": {
-                            "name": "punctuation.tcl"
-                        }
-                    },
-                    "patterns": [
-                        {
-                            "include": "#braced__1"
-                        }
-                    ],
-                    "end": "(\\}([^\\s\\]]*))",
-                    "endCaptures": {
-                        "1": {
-                            "name": "punctuation.tcl"
-                        }
-                    }
+                    "beginCaptures": { "1": { "name": "punctuation.tcl" } },
+                    "patterns": [ { "include": "#braced__1" } ],
+                    "end": "(\\}([^\\s\\]\\x{0022}]*))",
+                    "endCaptures": { "1": { "name": "punctuation.tcl" } }
                 }
             ]
         },
@@ -61,42 +38,24 @@
                     "match": "(\\\\(?:\\d{1,3}|x[a-fA-F0-9]{1,2}|u[a-fA-F0-9]{1,4}|U[a-fA-F0-9]{1,8}|.))",
                     "name": "constant.character.escape.tcl"
                 },
-                {
-                    "include": "#keywords"
-                },
+                { "include": "#keywords" },
                 {
                     "match": "((?<={)\\s*(?:after|append|apply|array|auto_execok|auto_import|auto_load|auto_mkindex|auto_qualify|auto_reset|bgerror|binary|break|catch|cd|chan|clock|close|concat|continue|coroutine|dde|dict|encoding|eof|error|eval|exec|exit|expr|fblocked|fconfigure|fcopy|fileevent|file|flush|foreach|for|format|gets|global|glob|history|http|if|incr|info|interp|join|lappend|lassign|lindex|linsert|list|llength|lmap|load|lrange|lrepeat|lreplace|lreverse|lsearch|lset|lsort|memory|my|namespace|nextto|next|oo::class|oo::copy|oo::define|oo::objdefine|oo::object|open|package|parray|pid|pkg::create|pkg_mkIndex|platform::shell|proc|puts|pwd|read|regexp|registry|regsub|rename|return|scan|seek|self|set|socket|source|split|string|subst|switch|tailcall|tcl::prefix|tcl_endOfWord|tcl_findLibrary|tcl_startOfNextWord|tcl_startOfPreviousWord|tcl_wordBreakAfter|tcl_wordBreakBefore|tell|throw|time|trace|try|unknown|unload|unset|update|uplevel|upvar|variable|vwait|while|yieldto|yield)\\s+)",
                     "name": "keyword.tcl",
                     "comment": "Special handling for known commands."
                 },
-                {
-                    "include": "#braced_inner"
-                },
-                {
-                    "include": "#args"
-                }
+                { "include": "#braced_inner" },
+                { "include": "#args" }
             ]
         },
         "braced_inner": {
             "patterns": [
                 {
                     "begin": "(\\{)",
-                    "beginCaptures": {
-                        "1": {
-                            "name": "punctuation.tcl"
-                        }
-                    },
-                    "patterns": [
-                        {
-                            "include": "#braced_inner__1"
-                        }
-                    ],
+                    "beginCaptures": { "1": { "name": "punctuation.tcl" } },
+                    "patterns": [ { "include": "#braced_inner__1" } ],
                     "end": "(\\})",
-                    "endCaptures": {
-                        "1": {
-                            "name": "punctuation.tcl"
-                        }
-                    }
+                    "endCaptures": { "1": { "name": "punctuation.tcl" } }
                 }
             ]
         },
@@ -106,15 +65,9 @@
                     "match": "(\\\\[\\x{007b}\\x{007d}])",
                     "name": "constant.character.escape.tcl"
                 },
-                {
-                    "include": "#numeric"
-                },
-                {
-                    "include": "#braced_inner"
-                },
-                {
-                    "include": "#args"
-                }
+                { "include": "#numeric" },
+                { "include": "#braced_inner" },
+                { "include": "#args" }
             ]
         },
         "braced_lit": {
@@ -139,22 +92,10 @@
             "patterns": [
                 {
                     "begin": "(\\\\\\s*$)",
-                    "beginCaptures": {
-                        "1": {
-                            "name": "constant.character.escape.tcl"
-                        }
-                    },
-                    "patterns": [
-                        {
-                            "include": "#command__1"
-                        }
-                    ],
+                    "beginCaptures": { "1": { "name": "constant.character.escape.tcl" } },
+                    "patterns": [ { "include": "#command__1" } ],
                     "end": "((?<!\\\\\\s)$)",
-                    "endCaptures": {
-                        "1": {
-                            "name": "none.tcl"
-                        }
-                    }
+                    "endCaptures": { "1": { "name": "none.tcl" } }
                 },
                 {
                     "match": "(^\\s*#.*)",
@@ -169,73 +110,41 @@
                 {
                     "match": "(?<=^|{)(\\s*proc\\s+)(\\S+\\s+)((?:(?<!\\\\){)(?:[^\\x{007b}\\x{007d}\\n]*(?:\\g<1>(?:\\\\{|\\\\}|[^\\x{007b}\\x{007d}])*)*)})",
                     "captures": {
-                        "1": {
-                            "name": "keyword.tcl"
-                        },
-                        "2": {
-                            "name": "entity.name.function.tcl"
-                        },
-                        "3": {
-                            "name": "none.tcl"
-                        }
+                        "1": { "name": "keyword.tcl" },
+                        "2": { "name": "entity.name.function.tcl" },
+                        "3": { "name": "none.tcl" }
                     },
                     "comment": "Proc command."
                 },
+                { "include": "#regexp" },
+                { "include": "#keywords" },
                 {
-                    "include": "#regexp"
-                },
-                {
-                    "include": "#keywords"
-                },
-                {
-                    "match": "(^\\s*\\S+|(?:(?<=[^\\x{005c}]\\[)[^\\s\\]]++(?!\\])))",
+                    "match": "(^\\s*[^\\s\\x{0022}]+|(?:(?<=[^\\x{005c}]\\[)[^\\s\\]]+))",
                     "name": "keyword.tcl",
                     "comment": "All other commands. (NOTE: Iro doesn't support possessive quantifiers, but the grammar does; be sure to replace the second + with ++ after regenerating!)"
                 },
-                {
-                    "include": "#args"
-                }
+                { "include": "#args" }
             ]
         },
         "command__1": {
             "patterns": [
-                {
-                    "include": "#keywords"
-                },
-                {
-                    "include": "#args"
-                }
+                { "include": "#keywords" },
+                { "include": "#args" }
             ]
         },
         "embedded": {
             "patterns": [
                 {
                     "begin": "((?<!\\\\)\\[)",
-                    "beginCaptures": {
-                        "1": {
-                            "name": "punctuation.tcl"
-                        }
-                    },
-                    "patterns": [
-                        {
-                            "include": "#embedded__1"
-                        }
-                    ],
+                    "beginCaptures": { "1": { "name": "punctuation.tcl" } },
+                    "patterns": [ { "include": "#embedded__1" } ],
                     "end": "((?<!\\\\)\\])",
-                    "endCaptures": {
-                        "1": {
-                            "name": "punctuation.tcl"
-                        }
-                    }
+                    "endCaptures": { "1": { "name": "punctuation.tcl" } }
                 }
             ]
         },
         "embedded__1": {
-            "patterns": [
-                {
-                    "include": "#command"
-                }
-            ]
+            "patterns": [ { "include": "#command" } ]
         },
         "keywords": {
             "patterns": [
@@ -263,30 +172,16 @@
             "patterns": [
                 {
                     "begin": "((?<!\\\\)\")",
-                    "beginCaptures": {
-                        "1": {
-                            "name": "string.tcl"
-                        }
-                    },
-                    "patterns": [
-                        {
-                            "include": "#quoted__1"
-                        }
-                    ],
+                    "beginCaptures": { "1": { "name": "string.tcl" } },
+                    "patterns": [ { "include": "#quoted__1" } ],
                     "end": "(\")",
-                    "endCaptures": {
-                        "1": {
-                            "name": "string.tcl"
-                        }
-                    }
+                    "endCaptures": { "1": { "name": "string.tcl" } }
                 }
             ]
         },
         "quoted__1": {
             "patterns": [
-                {
-                    "include": "#quoted_args"
-                },
+                { "include": "#quoted_args" },
                 {
                     "match": "([^\\x{0024}\\x{005b}\\x{0022}\\x{005c}]+)",
                     "name": "string.tcl"
@@ -295,22 +190,14 @@
         },
         "quoted_args": {
             "patterns": [
-                {
-                    "include": "#braced"
-                },
-                {
-                    "include": "#quoted"
-                },
-                {
-                    "include": "#embedded"
-                },
+                { "include": "#braced" },
+                { "include": "#quoted" },
+                { "include": "#embedded" },
                 {
                     "match": "(\\\\(?:\\d{1,3}|x[a-fA-F0-9]{1,2}|u[a-fA-F0-9]{1,4}|U[a-fA-F0-9]{1,8}|.))",
                     "name": "constant.character.escape.tcl"
                 },
-                {
-                    "include": "#variable"
-                }
+                { "include": "#variable" }
             ]
         },
         "regexp": {
@@ -318,57 +205,27 @@
                 {
                     "begin": "((?<=^|[\\[\\x{007b}\\x{003b}])\\s*(?:regexp|regsub)\\s+)((?:(?:(?:-about|-all|-expanded|-indices|-inline|-lineanchor|-linestop|-line|-nocase|(?:-index\\s+(?:end|\\d+)(?:[\\+\\-]-?\\d+)?))\\s+)*(?:--\\s+)?)?)",
                     "beginCaptures": {
-                        "1": {
-                            "name": "keyword.tcl"
-                        },
-                        "2": {
-                            "name": "none.tcl"
-                        }
+                        "1": { "name": "keyword.tcl" },
+                        "2": { "name": "none.tcl" }
                     },
-                    "patterns": [
-                        {
-                            "include": "#regexp__1"
-                        }
-                    ],
+                    "patterns": [ { "include": "#regexp__1" } ],
                     "end": "(\\s+)",
-                    "endCaptures": {
-                        "1": {
-                            "name": "none.tcl"
-                        }
-                    }
+                    "endCaptures": { "1": { "name": "none.tcl" } }
                 },
-                {
-                    "include": "#args"
-                }
+                { "include": "#args" }
             ]
         },
         "regexp__1": {
             "patterns": [
-                {
-                    "include": "#braced_lit_re"
-                },
+                { "include": "#braced_lit_re" },
                 {
                     "begin": "((?:(?<!\\\\)\"))",
-                    "beginCaptures": {
-                        "1": {
-                            "name": "string.regexp.tcl"
-                        }
-                    },
-                    "patterns": [
-                        {
-                            "include": "#regexp__2"
-                        }
-                    ],
+                    "beginCaptures": { "1": { "name": "string.regexp.tcl" } },
+                    "patterns": [ { "include": "#regexp__2" } ],
                     "end": "((?:(?<!\\\\)\"))",
-                    "endCaptures": {
-                        "1": {
-                            "name": "string.regexp.tcl"
-                        }
-                    }
-                },
-                {
-                    "include": "#variable"
+                    "endCaptures": { "1": { "name": "string.regexp.tcl" } }
                 },
+                { "include": "#variable" },
                 {
                     "match": "(\\S+)",
                     "name": "string.regexp.tcl",
@@ -378,15 +235,9 @@
         },
         "regexp__2": {
             "patterns": [
-                {
-                    "include": "#braced_lit_re"
-                },
-                {
-                    "include": "#embedded"
-                },
-                {
-                    "include": "#variable"
-                },
+                { "include": "#braced_lit_re" },
+                { "include": "#embedded" },
+                { "include": "#variable" },
                 {
                     "match": "(\\\\\"|[^\\x{0022}])",
                     "name": "string.regexp.tcl",
@@ -404,15 +255,9 @@
         },
         "word_lit__1": {
             "patterns": [
-                {
-                    "include": "#braced_lit"
-                },
-                {
-                    "include": "#embedded"
-                },
-                {
-                    "include": "#variable"
-                },
+                { "include": "#braced_lit" },
+                { "include": "#embedded" },
+                { "include": "#variable" },
                 {
                     "match": "(\\\\\"|[^\\x{0022}])",
                     "name": "string.tcl",