Method handleBackspace

packages/pi-tui/src/components/editor.ts:1370–1425

()

	}

	private handleBackspace(): void {
		this.exitHistoryBrowsing();
		this.lastAction = null;

		if (this.state.cursorCol > 0) {
			this.pushUndoSnapshot();

			// Delete grapheme before cursor (handles emojis, combining characters, etc.)
			const line = this.state.lines[this.state.cursorLine] || "";
			const beforeCursor = line.slice(0, this.state.cursorCol);

			// Find the last grapheme in the text before cursor
			const graphemes = [...this.segment(beforeCursor, "grapheme")];
			const lastGrapheme = graphemes[graphemes.length - 1];
			const graphemeLength = lastGrapheme ? lastGrapheme.segment.length : 1;

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

			this.state.lines[this.state.cursorLine] = before + after;
			this.setCursorCol(this.state.cursorCol - graphemeLength);
		} else if (this.state.cursorLine > 0) {
			this.pushUndoSnapshot();

			// Merge with previous line
			const currentLine = this.state.lines[this.state.cursorLine] || "";
			const previousLine = this.state.lines[this.state.cursorLine - 1] || "";

			this.state.lines[this.state.cursorLine - 1] = previousLine + currentLine;
			this.state.lines.splice(this.state.cursorLine, 1);

			this.state.cursorLine--;
			this.setCursorCol(previousLine.length);
		}

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

		// Update or re-trigger autocomplete after backspace
		if (this.autocompleteState) {
			this.updateAutocomplete();
		} else {
			// If autocomplete was cancelled (no matches), re-trigger if we're in a completable context
			const currentLine = this.state.lines[this.state.cursorLine] || "";
			const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
			// Slash command context
			if (this.isInSlashCommandContext(textBeforeCursor)) {
				this.tryTriggerAutocomplete();
			}
			// Symbol-based completion context like @, #, or provider triggers
			else if (this.autocompleteTriggerPattern.test(textBeforeCursor)) {
				this.tryTriggerAutocomplete();
			}
		}
	}

	/**