Method insertCharacter

packages/pi-tui/src/components/editor.ts:1190–1248

(char: string, skipUndoCoalescing?: boolean)

	// All the editor methods from before...
	private insertCharacter(char: string, skipUndoCoalescing?: boolean): void {
		this.exitHistoryBrowsing();

		// Undo coalescing (fish-style):
		// - Consecutive word chars coalesce into one undo unit
		// - Space captures state before itself (so undo removes space+following word together)
		// - Each space is separately undoable
		// Skip coalescing when called from atomic operations (e.g., handlePaste)
		if (!skipUndoCoalescing) {
			if (isWhitespaceChar(char) || this.lastAction !== "type-word") {
				this.pushUndoSnapshot();
			}
			this.lastAction = "type-word";
		}

		const line = this.state.lines[this.state.cursorLine] || "";

		const before = line.slice(0, this.state.cursorCol);
		const after = line.slice(this.state.cursorCol);

		this.state.lines[this.state.cursorLine] = before + char + after;
		this.setCursorCol(this.state.cursorCol + char.length);

		if (this.onChange) {
			this.onChange(this.getText());
		}

		// Check if we should trigger or update autocomplete
		if (!this.autocompleteState) {
			// Auto-trigger for "/" at the start of a line (slash commands)
			if (char === "/" && this.isAtStartOfMessage()) {
				this.tryTriggerAutocomplete();
			}
			// Auto-trigger for symbol-based completion like @, #, or provider triggers at token boundaries
			else if (this.autocompleteTriggerCharacters.includes(char)) {
				const currentLine = this.state.lines[this.state.cursorLine] || "";
				const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
				const charBeforeSymbol = textBeforeCursor[textBeforeCursor.length - 2];
				if (textBeforeCursor.length === 1 || charBeforeSymbol === " " || charBeforeSymbol === "\t") {
					this.tryTriggerAutocomplete();
				}
			}
			// Also auto-trigger when typing letters in a slash command or symbol completion context
			else if (/[a-zA-Z0-9.\-_]/.test(char)) {
				const currentLine = this.state.lines[this.state.cursorLine] || "";
				const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
				// Check if we're in a slash command (with or without space for arguments)
				if (this.isInSlashCommandContext(textBeforeCursor)) {
					this.tryTriggerAutocomplete();
				}
				// Check if we're in a symbol-based completion context like @, #, or provider triggers
				else if (this.autocompleteTriggerPattern.test(textBeforeCursor)) {
					this.tryTriggerAutocomplete();
				}
			}
		} else {
			this.updateAutocomplete();
		}