feat(plugin): add keyword Tab indentation and selection formatting

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

1 files changed, 29 insertions, 2 deletions

diff --git a/plugin/src/extension.js b/plugin/src/extension.js
index 1101ed6..a7b4834 100644
--- a/plugin/src/extension.js
+++ b/plugin/src/extension.js
@@ -1,6 +1,33 @@
 'use strict';
 
-// Language registration and TextMate highlighting are declarative.
-function activate() {}
+const vscode = require('vscode');
+const { indentationEdits } = require('./indentation');
+const { codeOnly } = require('./lexical');
+const languageId = 'cie-pseudocode';
+
+function formatLines(document, startLine, endLine, keepBlankIndent = false) {
+	const lines = document.getText().split(/\r?\n/);
+	return indentationEdits(lines, startLine, endLine, keepBlankIndent).map(edit =>
+		vscode.TextEdit.replace(new vscode.Range(edit.line, 0, edit.line, edit.length), edit.text));
+}
+
+function activate(context) {
+	context.subscriptions.push(
+		vscode.languages.registerDocumentRangeFormattingEditProvider(languageId, {
+			provideDocumentRangeFormattingEdits(document, range) {
+				const endLine = range.end.character === 0 && range.end.line > range.start.line
+					? range.end.line - 1 : range.end.line;
+				return formatLines(document, range.start.line, endLine);
+			}
+		}),
+		vscode.languages.registerOnTypeFormattingEditProvider(languageId, {
+			provideOnTypeFormattingEdits(document, position, char) {
+				if (char !== '\n' && !/^\s*(?:ELSE|ENDIF|ENDWHILE|UNTIL|NEXT|ENDFUNCTION|ENDPROCEDURE|ENDTYPE)\b/.test(
+					codeOnly(document.lineAt(position.line).text))) return [];
+				return formatLines(document, position.line, position.line, char === '\n');
+			}
+		}, '\n', 'E', 'F', 'L', 'T', 'N')
+	);
+}
 
 module.exports = { activate };