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1import type { ServerProviderSkill } from "@t3tools/contracts";
2import { preloadPatchFile } from "@pierre/diffs/ssr";
3import { useAtomValue } from "@effect/atom-react";
4import * as Effect from "effect/Effect";
5import { AsyncResult, Atom } from "effect/reactivity";
6import { useEffect, useRef, useState } from "react";
7import {
8 ComposerPromptEditorTiptap as ComposerPromptEditor,
9 type ComposerPromptEditorHandle,
10} from "../ComposerPromptEditorTiptap";
11import { EMPTY_COMPOSER_CONTEXT_RECORDS } from "../composerContextPresentation";
12import { terminalThemeFromApp } from "../ThreadTerminalDrawer";
13import { useRenderedAppearance, useTheme } from "../../hooks/useTheme";
14import { DEFAULT_COMPOSER_PLACEHOLDER } from "../../composerPlaceholder";
15import { resolveDiffThemeName, type DiffThemeName } from "../../lib/diffRendering";
16import { PREFERRED_HIGHLIGHTER } from "../../lib/syntaxHighlighting";
17import { GhosttyTerminalSurface } from "~/terminal/ghostty/surface";
18
19const PREVIEW_SKILLS: ReadonlyArray<ServerProviderSkill> = [
20 { name: "frontend-design", path: ".agents/skills/frontend-design/SKILL.md", enabled: true },
21];
22
23const PROMPT_PREVIEW_TEXT =
24 "Use $frontend-design to fix the flaky test in " +
25 "[surface.test.ts](apps/web/src/terminal/ghostty/surface.test.ts) and align the header with " +
26 "[SettingsPanels.tsx](apps/web/src/components/settings/SettingsPanels.tsx) before shipping.";
27
28function noop() {}
29
30export function PromptFontPreview() {
31 const editorRef = useRef<ComposerPromptEditorHandle>(null);
32 const [prompt, setPrompt] = useState(PROMPT_PREVIEW_TEXT);
33 const [cursor, setCursor] = useState(PROMPT_PREVIEW_TEXT.length);
34 const onChange = (nextValue: string, nextCursor: number) => {
35 setPrompt(nextValue);
36 setCursor(nextCursor);
37 };
38 return (
39 <div className="mt-1 mb-2 rounded-control surface-well px-3 py-2">
40 <ComposerPromptEditor
41 ariaLabel="Prompt font preview"
42 editorRef={editorRef}
43 value={prompt}
44 cursor={cursor}
45 contextRecords={EMPTY_COMPOSER_CONTEXT_RECORDS}
46 skills={PREVIEW_SKILLS}
47 disabled={false}
48 placeholder={DEFAULT_COMPOSER_PLACEHOLDER}
49 className="max-h-42"
50 onChange={onChange}
51 onPaste={noop}
52 />
53 </div>
54 );
55}
56
57const DIFF_PREVIEW_PATCH = [
58 "diff --git a/src/formatUser.ts b/src/formatUser.ts",
59 "--- a/src/formatUser.ts",
60 "+++ b/src/formatUser.ts",
61 "@@ -1,3 +1,3 @@",
62 " export function formatUser(user: User) {",
63 "- return user.name.toUpperCase();",
64 "+ return `${user.name} <${user.email}>`; // 0O 1lI",
65 " }",
66 "",
67].join("\n");
68
69// FileDiff remounts can retain unhighlighted frames after a race; use static highlighted HTML in shadow DOM.
70function loadDiffPreviewHtml(theme: DiffThemeName): Promise<readonly string[]> {
71 return preloadPatchFile({
72 patch: DIFF_PREVIEW_PATCH,
73 options: { diffStyle: "unified", theme, preferredHighlighter: PREFERRED_HIGHLIGHTER },
74 }).then((results) => results.map((result) => result.prerenderedHTML));
75}
76
77// Unlayered shadow-root rules override Pierre surfaces with app code tokens to match the diff panel.
78const DIFF_PREVIEW_THEME_BRIDGE = `
79 :host {
80 color: var(--code-foreground);
81 background-color: var(--code-background);
82 --diffs-fg: var(--code-foreground);
83 --diffs-bg: var(--code-background);
84 --diffs-light-bg: var(--code-background);
85 --diffs-dark-bg: var(--code-background);
86 }
87 [data-diffs-header] {
88 background-color: var(--code-background);
89 color: var(--code-foreground);
90 }
91`;
92
93// Each host is keyed by its html, so the ref callback runs once per document.
94// React detaches a cleanup-less ref callback with null when an appearance switch drops the host.
95function StaticDiffHtml({ html }: { html: string }) {
96 const attachHtml = (host: HTMLDivElement | null) => {
97 if (host === null) return;
98 const shadow = host.shadowRoot ?? host.attachShadow({ mode: "open" });
99 shadow.innerHTML = html;
100 const bridge = document.createElement("style");
101 bridge.textContent = DIFF_PREVIEW_THEME_BRIDGE;
102 shadow.append(bridge);
103 };
104 return <div ref={attachHtml} />;
105}
106
107const diffPreviewHtmlAtom = Atom.family((theme: DiffThemeName) =>
108 Atom.make(Effect.promise(() => loadDiffPreviewHtml(theme))).pipe(
109 Atom.keepAlive,
110 Atom.withLabel(`settings-diff-preview:${theme}`),
111 ),
112);
113
114export function CodeFontPreview() {
115 const resolvedTheme = useRenderedAppearance();
116 const loadedHtml = AsyncResult.getOrElse(
117 useAtomValue(diffPreviewHtmlAtom(resolveDiffThemeName(resolvedTheme))),
118 () => null,
119 );
120 // An appearance switch keeps the previous theme's preview up while the new one renders.
121 const [htmlByFile, setHtmlByFile] = useState(loadedHtml);
122 if (loadedHtml !== null && loadedHtml !== htmlByFile) setHtmlByFile(loadedHtml);
123 if (htmlByFile === null) return null;
124 // Boxed like the terminal preview below it.
125 return (
126 <div className="mt-1 mb-2 space-y-2 overflow-hidden rounded-control border border-border">
127 {htmlByFile.map((html) => (
128 <StaticDiffHtml key={html} html={html} />
129 ))}
130 </div>
131 );
132}
133
134const TERMINAL_PROMPT =
135 "\x1b[1;32m→\x1b[0m \x1b[1;36mt3code\x1b[0m \x1b[1;34mgit:(\x1b[1;31mmain\x1b[1;34m)\x1b[0m \x1b[1;33m✗\x1b[0m ";
136const TERMINAL_PREVIEW_TRANSCRIPT =
137 `${TERMINAL_PROMPT}vpr dev\r\n` +
138 "\r\n" +
139 " \x1b[1;32mVITE\x1b[0m \x1b[32mv7.1.1\x1b[0m \x1b[2mready in\x1b[0m \x1b[1m1.24s\x1b[0m\r\n" +
140 "\r\n" +
141 " \x1b[32m→\x1b[0m \x1b[2mLocal:\x1b[0m \x1b[4;36mhttp://127.0.0.1:5173/\x1b[0m\r\n" +
142 " \x1b[32m→\x1b[0m \x1b[2mNetwork:\x1b[0m \x1b[4;36mhttp://192.168.1.24:5173/\x1b[0m\r\n" +
143 "\r\n" +
144 " \x1b[32m✓ 85 passed\x1b[0m \x1b[33m△ 2 warnings\x1b[0m \x1b[31m✗ 0 failed\x1b[0m\r\n" +
145 "\r\n" +
146 " \x1b[42;30m READY \x1b[0m \x1b[2mwatching for changes, press\x1b[0m \x1b[1mq\x1b[0m \x1b[2mto quit\x1b[0m\r\n" +
147 "\r\n" +
148 TERMINAL_PROMPT;
149const TERMINAL_PREVIEW_ROWS = TERMINAL_PREVIEW_TRANSCRIPT.split("\r\n").length;
150
151function previewTerminalFont(family: string, size: number): { family?: string; size: number } {
152 const trimmed = family.trim();
153 return trimmed.length > 0 ? { family: trimmed, size } : { size };
154}
155
156export function TerminalFontPreview({ family, size }: { family: string; size: number }) {
157 const mountRef = useRef<HTMLDivElement>(null);
158 const [surface, setSurface] = useState<GhosttyTerminalSurface | null>(null);
159 const [initialFont] = useState(() => previewTerminalFont(family, size));
160 const { theme, resolvedTheme } = useTheme();
161
162 // The box grows with the font so the whole transcript shows without scrolling.
163 // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- applies the font to the Ghostty preview surface and resizes its DOM box to fit the rows
164 useEffect(() => {
165 if (!surface) return;
166 void surface.setFont(previewTerminalFont(family, size)).then(() => {
167 const mount = mountRef.current;
168 if (!mount) return;
169 // The border sits inside the box's height and is not part of the terminal's grid.
170 const border = mount.offsetHeight - mount.clientHeight;
171 mount.style.height = `${surface.heightForRows(TERMINAL_PREVIEW_ROWS) + border}px`;
172 surface.fit();
173 });
174 }, [surface, family, size]);
175
176 // Palette changes may preserve light/dark mode; re-read terminal tokens for every theme change.
177 // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- pushes theme tokens read from the DOM's computed styles into the Ghostty preview surface
178 useEffect(() => {
179 const mount = mountRef.current;
180 if (!mount || !surface) return;
181 surface.setTheme(terminalThemeFromApp(mount));
182 // oxlint-disable-next-line react/exhaustive-effect-dependencies -- The tokens come from the DOM's computed styles, which a theme change rewrites.
183 }, [surface, theme, resolvedTheme]);
184
185 const mountSurface = (mount: HTMLDivElement) => {
186 mountRef.current = mount;
187 let cancelled = false;
188 let created: GhosttyTerminalSurface | null = null;
189 let lineLength = 0;
190
191 const echo = (data: string) => {
192 if (!created) return;
193 if (data === "\r") {
194 created.write(`\r\n${TERMINAL_PROMPT}`);
195 lineLength = 0;
196 return;
197 }
198 if (data === "\x7f" || data === "\b") {
199 if (lineLength > 0) {
200 created.write("\b \b");
201 lineLength -= 1;
202 }
203 return;
204 }
205 if (data.startsWith("\x1b")) return;
206 const printable = [...data]
207 .filter((character) => character >= " " && character !== "\x7f")
208 .join("");
209 if (printable.length === 0) return;
210 created.write(printable);
211 lineLength += printable.length;
212 };
213
214 void GhosttyTerminalSurface.create(mount, {
215 theme: terminalThemeFromApp(mount),
216 font: initialFont,
217 onData: echo,
218 onResize: noop,
219 onSelectionChange: noop,
220 beforeKey: (event) => event.key !== "Tab",
221 onLinkActivate: noop,
222 }).then((next) => {
223 if (cancelled) {
224 next.dispose();
225 return;
226 }
227 created = next;
228 next.write(TERMINAL_PREVIEW_TRANSCRIPT);
229 setSurface(next);
230 });
231
232 return () => {
233 cancelled = true;
234 created?.dispose();
235 mountRef.current = null;
236 setSurface(null);
237 };
238 };
239
240 return (
241 <div
242 ref={mountSurface}
243 className="relative mt-1 mb-2 overflow-hidden rounded-control border border-border"
244 aria-label="Terminal font preview"
245 />
246 );
247}