fix: align input editor with message content padding

Adds paddingX option to Editor component and hardcodes paddingX: 1 in
coding-agent editors so the cursor/text aligns with chat message content.

packages/coding-agent/CHANGELOG.md

@@ -15,6 +15,7 @@
 ### Fixed
 
 - Fixed crash during auto-compaction when summarization fails (e.g., quota exceeded). Now displays error message instead of crashing ([#792](https://github.com/badlogic/pi-mono/issues/792))
+- Input editor now aligns with message content padding ([#791](https://github.com/badlogic/pi-mono/pull/791) by [@ferologics](https://github.com/ferologics))
 - Fixed `--no-extensions` flag not preventing extension discovery ([#776](https://github.com/badlogic/pi-mono/issues/776))
 - Fixed extension messages rendering twice on startup when `pi.sendMessage({ display: true })` is called during `session_start` ([#765](https://github.com/badlogic/pi-mono/pull/765) by [@dannote](https://github.com/dannote))
 - Fixed `PI_CODING_AGENT_DIR` env var not expanding tilde (`~`) to home directory ([#778](https://github.com/badlogic/pi-mono/pull/778) by [@aliou](https://github.com/aliou))

packages/coding-agent/src/modes/interactive/components/custom-editor.ts

@@ -1,4 +1,4 @@
-import { Editor, type EditorTheme, type TUI } from "@mariozechner/pi-tui";
+import { Editor, type EditorOptions, type EditorTheme, type TUI } from "@mariozechner/pi-tui";
 import type { AppAction, KeybindingsManager } from "../../../core/keybindings.js";
 
 /**
@@ -15,8 +15,8 @@ export class CustomEditor extends Editor {
 	/** Handler for extension-registered shortcuts. Returns true if handled. */
 	public onExtensionShortcut?: (data: string) => boolean;
 
-	constructor(tui: TUI, theme: EditorTheme, keybindings: KeybindingsManager) {
+	constructor(tui: TUI, theme: EditorTheme, keybindings: KeybindingsManager, options?: EditorOptions) {
-		super(tui, theme);
+		super(tui, theme, options);
 		this.keybindings = keybindings;
 	}
 

packages/coding-agent/src/modes/interactive/components/extension-editor.ts

@@ -7,7 +7,15 @@ import { spawnSync } from "node:child_process";
 import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
-import { Container, Editor, getEditorKeybindings, Spacer, Text, type TUI } from "@mariozechner/pi-tui";
+import {
+	Container,
+	Editor,
+	type EditorOptions,
+	getEditorKeybindings,
+	Spacer,
+	Text,
+	type TUI,
+} from "@mariozechner/pi-tui";
 import type { KeybindingsManager } from "../../../core/keybindings.js";
 import { getEditorTheme, theme } from "../theme/theme.js";
 import { DynamicBorder } from "./dynamic-border.js";
@@ -27,6 +35,7 @@ export class ExtensionEditorComponent extends Container {
 		prefill: string | undefined,
 		onSubmit: (value: string) => void,
 		onCancel: () => void,
+		options?: EditorOptions,
 	) {
 		super();
 
@@ -44,7 +53,7 @@ export class ExtensionEditorComponent extends Container {
 		this.addChild(new Spacer(1));
 
 		// Create editor
-		this.editor = new Editor(tui, getEditorTheme());
+		this.editor = new Editor(tui, getEditorTheme(), options);
 		if (prefill) {
 			this.editor.setText(prefill);
 		}

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -241,7 +241,7 @@ export class InteractiveMode {
 		this.statusContainer = new Container();
 		this.widgetContainer = new Container();
 		this.keybindings = KeybindingsManager.create();
-		this.defaultEditor = new CustomEditor(this.ui, getEditorTheme(), this.keybindings);
+		this.defaultEditor = new CustomEditor(this.ui, getEditorTheme(), this.keybindings, { paddingX: 1 });
 		this.editor = this.defaultEditor;
 		this.editorContainer = new Container();
 		this.editorContainer.addChild(this.editor as Component);
@@ -1150,6 +1150,7 @@ export class InteractiveMode {
 					this.hideExtensionEditor();
 					resolve(undefined);
 				},
+				{ paddingX: 1 },
 			);
 
 			this.editorContainer.clear();

packages/tui/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- `EditorOptions` with optional `paddingX` for horizontal content padding ([#791](https://github.com/badlogic/pi-mono/pull/791) by [@ferologics](https://github.com/ferologics))
+
 ### Changed
 
 - Hardware cursor is now disabled by default for better terminal compatibility. Set `PI_HARDWARE_CURSOR=1` to enable (replaces `PI_NO_HARDWARE_CURSOR=1` which disabled it).

packages/tui/src/components/editor.ts

@@ -242,6 +242,10 @@ export interface EditorTheme {
 	selectList: SelectListTheme;
 }
 
+export interface EditorOptions {
+	paddingX?: number;
+}
+
 export class Editor implements Component, Focusable {
 	private state: EditorState = {
 		lines: [""],
@@ -254,6 +258,7 @@ export class Editor implements Component, Focusable {
 
 	protected tui: TUI;
 	private theme: EditorTheme;
+	private paddingX: number = 0;
 
 	// Store last render width for cursor navigation
 	private lastWidth: number = 80;
@@ -287,10 +292,12 @@ export class Editor implements Component, Focusable {
 	public onChange?: (text: string) => void;
 	public disableSubmit: boolean = false;
 
-	constructor(tui: TUI, theme: EditorTheme) {
+	constructor(tui: TUI, theme: EditorTheme, options: EditorOptions = {}) {
 		this.tui = tui;
 		this.theme = theme;
 		this.borderColor = theme.borderColor;
+		const paddingX = options.paddingX ?? 0;
+		this.paddingX = Number.isFinite(paddingX) ? Math.max(0, Math.floor(paddingX)) : 0;
 	}
 
 	setAutocompleteProvider(provider: AutocompleteProvider): void {
@@ -364,13 +371,17 @@ export class Editor implements Component, Focusable {
 	}
 
 	render(width: number): string[] {
+		const maxPadding = Math.max(0, Math.floor((width - 1) / 2));
+		const paddingX = Math.min(this.paddingX, maxPadding);
+		const contentWidth = Math.max(1, width - paddingX * 2);
+
 		// Store width for cursor navigation
-		this.lastWidth = width;
+		this.lastWidth = contentWidth;
 
 		const horizontal = this.borderColor("─");
 
-		// Layout the text - use full width
+		// Layout the text - use content width
-		const layoutLines = this.layoutText(width);
+		const layoutLines = this.layoutText(contentWidth);
 
 		// Calculate max visible lines: 30% of terminal height, minimum 5 lines
 		const terminalRows = this.tui.terminal.rows;
@@ -395,6 +406,8 @@ export class Editor implements Component, Focusable {
 		const visibleLines = layoutLines.slice(this.scrollOffset, this.scrollOffset + maxVisibleLines);
 
 		const result: string[] = [];
+		const leftPadding = " ".repeat(paddingX);
+		const rightPadding = leftPadding;
 
 		// Render top border (with scroll indicator if scrolled down)
 		if (this.scrollOffset > 0) {
@@ -432,7 +445,7 @@ export class Editor implements Component, Focusable {
 					// lineVisibleWidth stays the same - we're replacing, not adding
 				} else {
 					// Cursor is at the end - check if we have room for the space
-					if (lineVisibleWidth < width) {
+					if (lineVisibleWidth < contentWidth) {
 						// We have room - add highlighted space
 						const cursor = "\x1b[7m \x1b[0m";
 						displayText = before + marker + cursor;
@@ -458,10 +471,10 @@ export class Editor implements Component, Focusable {
 			}
 
 			// Calculate padding based on actual visible width
-			const padding = " ".repeat(Math.max(0, width - lineVisibleWidth));
+			const padding = " ".repeat(Math.max(0, contentWidth - lineVisibleWidth));
 
 			// Render the line (no side borders, just horizontal lines above and below)
-			result.push(displayText + padding);
+			result.push(`${leftPadding}${displayText}${padding}${rightPadding}`);
 		}
 
 		// Render bottom border (with scroll indicator if more content below)
@@ -476,8 +489,12 @@ export class Editor implements Component, Focusable {
 
 		// Add autocomplete list if active
 		if (this.isAutocompleting && this.autocompleteList) {
-			const autocompleteResult = this.autocompleteList.render(width);
+			const autocompleteResult = this.autocompleteList.render(contentWidth);
-			result.push(...autocompleteResult);
+			for (const line of autocompleteResult) {
+				const lineWidth = visibleWidth(line);
+				const linePadding = " ".repeat(Math.max(0, contentWidth - lineWidth));
+				result.push(`${leftPadding}${line}${linePadding}${rightPadding}`);
+			}
 		}
 
 		return result;

packages/tui/src/index.ts

@@ -10,7 +10,7 @@ export {
 // Components
 export { Box } from "./components/box.js";
 export { CancellableLoader } from "./components/cancellable-loader.js";
-export { Editor, type EditorTheme } from "./components/editor.js";
+export { Editor, type EditorOptions, type EditorTheme } from "./components/editor.js";
 export { Image, type ImageOptions, type ImageTheme } from "./components/image.js";
 export { Input } from "./components/input.js";
 export { Loader } from "./components/loader.js";