paperclip/packages/plugins/plugin-workspace-diff/src/ui/index.tsx

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import type { PluginDetailTabProps } from "@paperclipai/plugin-sdk/ui";
import { copyTextToClipboard, usePluginData, usePluginToast } from "@paperclipai/plugin-sdk/ui";
import { DIFFS_TAG_NAME, getSingularPatch } from "@pierre/diffs";
import type { PatchDiffProps } from "@pierre/diffs/react";
import { useFileDiffInstance } from "@pierre/diffs/react";
import {
createElement,
type KeyboardEvent,
type PointerEvent,
type ReactNode,
useCallback,
useEffect,
useMemo,
useRef,
useState,
} from "react";
import {
diffSummary,
fileName,
initialExpandedFileSet,
nextExpandedFileSet,
statusLabel,
toFileViewModels,
type DiffFileViewModel,
type DiffPatchViewModel,
type DiffRenderMode,
} from "../diff-model.js";
import type { WorkspaceDiffResponse } from "../contracts.js";
type WorkspaceDiffData = WorkspaceDiffResponse;
type WorkspacePatchDiffOptions = PatchDiffProps<undefined>["options"];
type DiffViewMode = "working-tree" | "head";
type LucideIconProps = { size?: number };
const DEFAULT_FILE_SIDEBAR_WIDTH = 280;
const MIN_FILE_SIDEBAR_WIDTH = 220;
const MAX_FILE_SIDEBAR_WIDTH = 520;
const FILE_SIDEBAR_WIDTH_STEP = 16;
const FILE_SIDEBAR_WIDTH_STORAGE_KEY = "paperclip.workspace-diff.files-sidebar-width";
function makeLucideIcon(paths: ReactNode) {
return function LucideIcon({ size = 16 }: LucideIconProps) {
return (
<svg
aria-hidden="true"
viewBox="0 0 24 24"
fill="none"
stroke="currentColor"
strokeWidth="2"
strokeLinecap="round"
strokeLinejoin="round"
style={{ width: size, height: size, display: "block" }}
>
{paths}
</svg>
);
};
}
// Plugin bundles cannot import host-only lucide-react; this mirrors lucide RefreshCw.
const RefreshCwIcon = makeLucideIcon(
<>
<path d="M3 12a9 9 0 0 1 9-9 9.75 9.75 0 0 1 6.74 2.74L21 8" />
<path d="M21 3v5h-5" />
<path d="M21 12a9 9 0 0 1-9 9 9.75 9.75 0 0 1-6.74-2.74L3 16" />
<path d="M8 16H3v5" />
</>,
);
function readInitialView(): DiffViewMode {
if (typeof window === "undefined") return "working-tree";
return new URLSearchParams(window.location.search).get("diffView") === "head" ? "head" : "working-tree";
}
function hasInitialViewParam() {
if (typeof window === "undefined") return false;
return new URLSearchParams(window.location.search).has("diffView");
}
function readInitialBaseRef() {
if (typeof window === "undefined") return "";
return new URLSearchParams(window.location.search).get("baseRef") ?? "";
}
function buttonClass(active = false) {
return [
"inline-flex h-8 items-center justify-center rounded-md border px-2.5 text-xs font-medium transition-colors",
active
? "border-foreground/20 bg-foreground text-background"
: "border-border bg-background text-muted-foreground hover:text-foreground",
].join(" ");
}
function iconButtonClass(active = false) {
return [
"inline-flex h-7 w-7 items-center justify-center rounded-md border text-xs transition-colors",
active
? "border-foreground/20 bg-foreground text-background"
: "border-border bg-background text-muted-foreground hover:text-foreground",
].join(" ");
}
function clampFileSidebarWidth(width: number) {
return Math.min(MAX_FILE_SIDEBAR_WIDTH, Math.max(MIN_FILE_SIDEBAR_WIDTH, width));
}
function readStoredFileSidebarWidth() {
if (typeof window === "undefined") return DEFAULT_FILE_SIDEBAR_WIDTH;
try {
const stored = window.localStorage.getItem(FILE_SIDEBAR_WIDTH_STORAGE_KEY);
if (!stored) return DEFAULT_FILE_SIDEBAR_WIDTH;
const parsed = Number.parseInt(stored, 10);
return Number.isFinite(parsed) ? clampFileSidebarWidth(parsed) : DEFAULT_FILE_SIDEBAR_WIDTH;
} catch {
return DEFAULT_FILE_SIDEBAR_WIDTH;
}
}
function writeStoredFileSidebarWidth(width: number) {
if (typeof window === "undefined") return;
try {
window.localStorage.setItem(FILE_SIDEBAR_WIDTH_STORAGE_KEY, String(clampFileSidebarWidth(width)));
} catch {
// Storage can be unavailable; keep resize interactive even when persistence fails.
}
}
function useIsDesktopDiffLayout() {
const [isDesktop, setIsDesktop] = useState(() => {
if (typeof window === "undefined" || typeof window.matchMedia !== "function") return false;
return window.matchMedia("(min-width: 1024px)").matches;
});
useEffect(() => {
if (typeof window === "undefined" || typeof window.matchMedia !== "function") return;
const query = window.matchMedia("(min-width: 1024px)");
const update = () => setIsDesktop(query.matches);
query.addEventListener("change", update);
return () => query.removeEventListener("change", update);
}, []);
return isDesktop;
}
function warningText(file: DiffFileViewModel) {
if (file.binary) return "Binary file";
if (file.oversized) return "Too large to render";
if (file.truncated) return "Patch truncated";
if (file.warnings.length > 0) return file.warnings[0]?.message ?? "Diff warning";
if (file.patches.every((patch) => !patch.patch)) return "No text patch";
return null;
}
const PATCH_KIND_LABELS: Record<DiffPatchViewModel["kind"], string> = {
staged: "Staged",
unstaged: "Unstaged",
head: "Head",
untracked: "Untracked",
};
function patchKindLabel(kind: DiffPatchViewModel["kind"]) {
return PATCH_KIND_LABELS[kind] ?? "Patch";
}
function patchWarningText(patch: DiffPatchViewModel) {
if (patch.binary) return "Binary file";
if (patch.oversized) return "Too large to render";
if (patch.truncated) return "Patch truncated";
if (patch.warnings.length > 0) return patch.warnings[0]?.message ?? "Diff warning";
if (!patch.patch) return "No text patch";
return null;
}
function FileRow({
file,
active,
expanded,
onSelect,
onToggle,
onCopy,
}: {
file: DiffFileViewModel;
active: boolean;
expanded: boolean;
onSelect: () => void;
onToggle: () => void;
onCopy: () => void;
}) {
const warning = warningText(file);
const expandLabel = expanded ? "Collapse file" : "Expand file";
const fileAriaLabel = expanded ? `Collapse ${file.path}` : `Expand ${file.path}`;
return (
<div
className={[
"group border-b border-border/70 px-3 py-2 last:border-b-0",
active ? "bg-accent/60" : "bg-background hover:bg-muted/45",
].join(" ")}
>
<div key="main" className="flex min-w-0 items-start gap-2">
<button
key="toggle"
type="button"
className="mt-0.5 text-muted-foreground hover:text-foreground"
onClick={onToggle}
title={expandLabel}
aria-label={fileAriaLabel}
>
{expanded ? "−" : "+"}
</button>
<button
key="select"
type="button"
className="min-w-0 flex-1 text-left"
onClick={onSelect}
>
<div key="name" className="truncate text-sm font-medium text-foreground">{fileName(file.path)}</div>
<div key="path" className="truncate font-mono text-[11px] text-muted-foreground">{file.path}</div>
</button>
<button
key="copy"
type="button"
className="text-muted-foreground opacity-0 transition-opacity hover:text-foreground group-hover:opacity-100"
onClick={onCopy}
title="Copy path"
aria-label={`Copy ${file.path}`}
>
⧉
</button>
</div>
<div key="meta" className="mt-1 flex flex-wrap items-center gap-x-2 gap-y-1 pl-5 text-[11px] text-muted-foreground">
<span key="status">{statusLabel(file.status)}</span>
<span key="additions" className="font-mono text-emerald-700 dark:text-emerald-300">{`+${file.additions}`}</span>
<span key="deletions" className="font-mono text-red-700 dark:text-red-300">{`-${file.deletions}`}</span>
{warning ? <span key="warning" className="text-amber-700 dark:text-amber-300">{warning}</span> : null}
</div>
</div>
);
}
// The upstream React wrapper emits React 19 key warnings for its internal slot array.
// This mounts the same Diffs custom element through the exported imperative hook.
function WorkspacePatchDiff({
patch,
options,
}: {
patch: string;
options: WorkspacePatchDiffOptions;
}) {
const fileDiff = useMemo(() => getSingularPatch(patch), [patch]);
const { ref } = useFileDiffInstance({
fileDiff,
options,
// This tab only shows a diff; it does not open an edit session.
edit: false,
editorOptions: undefined,
metrics: undefined,
lineAnnotations: undefined,
selectedLines: undefined,
prerenderedHTML: undefined,
hasGutterRenderUtility: false,
hasCustomHeader: false,
disableWorkerPool: false,
});
return createElement(DIFFS_TAG_NAME, { ref });
}
function EmptyState() {
return (
<div className="border border-dashed border-border bg-background px-4 py-8 text-center">
<div className="text-sm font-medium text-foreground">No workspace changes</div>
<div className="mt-1 text-sm text-muted-foreground">
The workspace matches its current comparison target.
</div>
</div>
);
}
function LoadingState() {
return (
<div className="border border-dashed border-border bg-background px-4 py-8 text-center text-sm text-muted-foreground">
Loading workspace changes…
</div>
);
}
export function ErrorState({
message,
onRetry,
}: {
message: string;
onRetry: () => void;
}) {
return (
<div className="border border-destructive/30 bg-destructive/5 px-4 py-3 text-sm" role="alert">
<div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
<div className="min-w-0">
<div className="font-medium text-foreground">Unable to load workspace changes.</div>
<div className="mt-1 text-muted-foreground">
Retry the request or open the details below for the technical error.
</div>
</div>
<button
type="button"
className={buttonClass(false)}
onClick={onRetry}
aria-label="Retry loading workspace changes"
>
Retry
</button>
</div>
<details className="mt-3">
<summary className="cursor-pointer text-xs font-medium text-muted-foreground hover:text-foreground">
Troubleshooting details
</summary>
<pre className="mt-2 max-h-40 overflow-auto whitespace-pre-wrap break-words border border-border bg-background px-3 py-2 font-mono text-xs text-muted-foreground">
{message || "No error message was provided."}
</pre>
</details>
</div>
);
}
function FileDiffPanel({
file,
mode,
lineWrap,
}: {
file: DiffFileViewModel;
mode: DiffRenderMode;
lineWrap: boolean;
}) {
const warning = warningText(file);
if (warning) {
return (
<div className="border border-dashed border-border bg-background px-4 py-6 text-sm text-muted-foreground">
{warning ?? "No renderable patch is available for this file."}
</div>
);
}
return (
<div className="space-y-3">
{file.patches.map((patch, index) => {
const patchWarning = patchWarningText(patch);
return (
<div key={`${patch.kind}:${index}`} className="overflow-hidden border border-border bg-background">
{file.patches.length > 1 ? (
<div className="flex items-center gap-2 border-b border-border bg-muted/30 px-3 py-2 text-xs text-muted-foreground">
<span className="font-medium text-foreground">{patchKindLabel(patch.kind)}</span>
<span className="font-mono text-emerald-700 dark:text-emerald-300">{`+${patch.additions}`}</span>
<span className="font-mono text-red-700 dark:text-red-300">{`-${patch.deletions}`}</span>
</div>
) : null}
{patchWarning || !patch.patch ? (
<div className="px-4 py-6 text-sm text-muted-foreground">
{patchWarning ?? "No renderable patch is available for this file."}
</div>
) : (
<WorkspacePatchDiff
patch={patch.patch}
options={{
diffStyle: mode,
overflow: lineWrap ? "wrap" : "scroll",
disableLineNumbers: false,
themeType: "system",
}}
/>
)}
</div>
);
})}
</div>
);
}
function CollapsedFilePanel({
file,
onExpand,
}: {
file: DiffFileViewModel;
onExpand: () => void;
}) {
const title = file.longDiff ? "Large diff folded" : "Diff folded";
const details = file.lineCount > 0
? `${file.lineCount.toLocaleString()} lines`
: statusLabel(file.status);
return (
<div className="border border-dashed border-border bg-background px-4 py-5 text-sm text-muted-foreground">
<div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
<div className="min-w-0">
<div className="font-medium text-foreground">{title}</div>
<div className="mt-1 font-mono text-xs">{details}</div>
</div>
<button
type="button"
className={buttonClass(false)}
onClick={onExpand}
aria-label={`Show diff for ${file.path}`}
>
Show file
</button>
</div>
</div>
);
}
export function ChangesTab({ context }: PluginDetailTabProps) {
const toast = usePluginToast();
const [mode, setMode] = useState<DiffRenderMode>("split");
const [lineWrap, setLineWrap] = useState(false);
const [view, setView] = useState<DiffViewMode>(() => readInitialView());
const [baseRef, setBaseRef] = useState(() => readInitialBaseRef());
const baseRefTouchedRef = useRef(Boolean(baseRef.trim()));
const viewTouchedRef = useRef(hasInitialViewParam());
const [includeUntracked, setIncludeUntracked] = useState(false);
const [expandedFiles, setExpandedFiles] = useState<Set<string>>(() => new Set());
const [selectedPath, setSelectedPath] = useState<string | null>(null);
const [fileSidebarWidth, setFileSidebarWidth] = useState(() => readStoredFileSidebarWidth());
const [fileSidebarResizing, setFileSidebarResizing] = useState(false);
const fileSidebarWidthRef = useRef(fileSidebarWidth);
const fileSidebarDragRef = useRef<{ startX: number; startWidth: number } | null>(null);
const fileSectionRefs = useRef(new Map<string, HTMLElement>());
const diffScrollRef = useRef<HTMLElement | null>(null);
const scrollSyncFrameRef = useRef<number | null>(null);
const usesDesktopDiffLayout = useIsDesktopDiffLayout();
const requestedBaseRef = baseRef.trim();
const effectiveView = view === "head" && !requestedBaseRef ? "working-tree" : view;
const fileSidebarStyle = useMemo(
() => usesDesktopDiffLayout ? { width: `${fileSidebarWidth}px` } : undefined,
[fileSidebarWidth, usesDesktopDiffLayout],
);
const params = useMemo(() => ({
workspaceId: context.entityId,
companyId: context.companyId ?? "",
projectId: context.projectId ?? "",
entityType: context.entityType,
view: effectiveView,
baseRef: requestedBaseRef || null,
includeUntracked,
}), [context.companyId, context.entityId, context.entityType, context.projectId, effectiveView, includeUntracked, requestedBaseRef]);
const { data, loading, error, refresh } = usePluginData<WorkspaceDiffData>("workspace-diff", params);
const files = useMemo(() => toFileViewModels(data), [data]);
const summary = useMemo(() => diffSummary(data), [data]);
const selectedFile = files.find((file) => file.path === selectedPath) ?? files[0] ?? null;
const compareLabel = `${data?.baseRef ? `base ${data.baseRef}` : "working tree"}${data?.headSha ? ` · ${data.headSha.slice(0, 12)}` : ""}`;
const setFileSectionRef = useCallback((filePath: string) => (node: HTMLElement | null) => {
if (node) fileSectionRefs.current.set(filePath, node);
else fileSectionRefs.current.delete(filePath);
}, []);
const selectFile = useCallback((filePath: string) => {
setSelectedPath(filePath);
window.requestAnimationFrame(() => {
fileSectionRefs.current.get(filePath)?.scrollIntoView({
block: "start",
behavior: "smooth",
});
});
}, []);
const syncSelectedPathFromScroll = useCallback(() => {
const container = diffScrollRef.current;
if (!container || files.length === 0) return;
const containerTop = container.getBoundingClientRect().top;
let nextPath = files[0]?.path ?? null;
for (const file of files) {
const section = fileSectionRefs.current.get(file.path);
if (!section) continue;
const offsetFromScrollTop = section.getBoundingClientRect().top - containerTop;
if (offsetFromScrollTop <= 48) {
nextPath = file.path;
} else {
break;
}
}
if (nextPath) {
setSelectedPath((current) => current === nextPath ? current : nextPath);
}
}, [files]);
const handleDiffScroll = useCallback(() => {
if (scrollSyncFrameRef.current !== null) return;
scrollSyncFrameRef.current = window.requestAnimationFrame(() => {
scrollSyncFrameRef.current = null;
syncSelectedPathFromScroll();
});
}, [syncSelectedPathFromScroll]);
const commitFileSidebarWidth = useCallback((nextWidth: number) => {
const clamped = clampFileSidebarWidth(nextWidth);
fileSidebarWidthRef.current = clamped;
setFileSidebarWidth(clamped);
writeStoredFileSidebarWidth(clamped);
}, []);
const handleFileSidebarPointerDown = useCallback((event: PointerEvent<HTMLDivElement>) => {
if (!usesDesktopDiffLayout) return;
event.preventDefault();
event.currentTarget.setPointerCapture(event.pointerId);
fileSidebarDragRef.current = {
startX: event.clientX,
startWidth: fileSidebarWidthRef.current,
};
setFileSidebarResizing(true);
}, [usesDesktopDiffLayout]);
const handleFileSidebarPointerMove = useCallback((event: PointerEvent<HTMLDivElement>) => {
const drag = fileSidebarDragRef.current;
if (!drag) return;
const nextWidth = clampFileSidebarWidth(drag.startWidth + event.clientX - drag.startX);
fileSidebarWidthRef.current = nextWidth;
setFileSidebarWidth(nextWidth);
}, []);
const endFileSidebarResize = useCallback(() => {
if (!fileSidebarDragRef.current) return;
fileSidebarDragRef.current = null;
setFileSidebarResizing(false);
writeStoredFileSidebarWidth(fileSidebarWidthRef.current);
}, []);
const handleFileSidebarKeyDown = useCallback((event: KeyboardEvent<HTMLDivElement>) => {
if (!usesDesktopDiffLayout) return;
if (event.key === "ArrowLeft") {
event.preventDefault();
commitFileSidebarWidth(fileSidebarWidth - FILE_SIDEBAR_WIDTH_STEP);
} else if (event.key === "ArrowRight") {
event.preventDefault();
commitFileSidebarWidth(fileSidebarWidth + FILE_SIDEBAR_WIDTH_STEP);
} else if (event.key === "Home") {
event.preventDefault();
commitFileSidebarWidth(MIN_FILE_SIDEBAR_WIDTH);
} else if (event.key === "End") {
event.preventDefault();
commitFileSidebarWidth(MAX_FILE_SIDEBAR_WIDTH);
}
}, [commitFileSidebarWidth, fileSidebarWidth, usesDesktopDiffLayout]);
useEffect(() => {
const defaultBaseRef = data?.defaultBaseRef?.trim();
if (!defaultBaseRef) return;
if (!baseRef.trim() && !baseRefTouchedRef.current) {
setBaseRef(defaultBaseRef);
}
if (view === "working-tree" && !viewTouchedRef.current) {
setView("head");
}
}, [baseRef, data?.defaultBaseRef, view]);
useEffect(() => {
if (files.length === 0) {
setExpandedFiles(new Set());
setSelectedPath(null);
return;
}
setExpandedFiles(initialExpandedFileSet(files));
setSelectedPath((current) => files.some((file) => file.path === current) ? current : files[0]?.path ?? null);
}, [files]);
useEffect(() => {
return () => {
if (scrollSyncFrameRef.current !== null) {
window.cancelAnimationFrame(scrollSyncFrameRef.current);
}
};
}, []);
useEffect(() => {
if (!fileSidebarResizing || typeof document === "undefined") return;
const previousCursor = document.body.style.cursor;
const previousUserSelect = document.body.style.userSelect;
document.body.style.cursor = "col-resize";
document.body.style.userSelect = "none";
return () => {
document.body.style.cursor = previousCursor;
document.body.style.userSelect = previousUserSelect;
};
}, [fileSidebarResizing]);
const copyPath = async (filePath: string) => {
try {
await copyTextToClipboard(filePath);
toast({ title: "Path copied", body: filePath });
} catch {
toast({ title: "Copy failed", body: filePath, tone: "error" });
}
};
return (
<div className="space-y-3">
<div key="toolbar" className="flex flex-col gap-3 border-b border-border pb-3 lg:flex-row lg:items-center lg:justify-between">
<div key="summary" className="min-w-0">
<div key="summary-line" className="flex flex-wrap items-center gap-2 text-sm">
<span key="changed" className="font-medium text-foreground">{summary.changedLabel}</span>
<span key="lines" className="font-mono text-xs text-muted-foreground">{summary.lineLabel}</span>
{summary.truncated ? (
<span key="truncated" className="text-xs text-amber-700 dark:text-amber-300">Truncated</span>
) : null}
{summary.warningCount > 0 ? (
<span key="warnings" className="text-xs text-muted-foreground">{summary.warningCount} warnings</span>
) : null}
</div>
<div key="compare" className="mt-1 truncate font-mono text-xs text-muted-foreground">
{compareLabel}
</div>
</div>
<div key="actions" className="flex flex-wrap items-center gap-2">
<div key="layout" className="inline-flex gap-1" aria-label="Diff layout">
<button key="split" type="button" className={buttonClass(mode === "split")} onClick={() => setMode("split")}>
Split
</button>
<button key="unified" type="button" className={buttonClass(mode === "unified")} onClick={() => setMode("unified")}>
Unified
</button>
</div>
<button
key="line-wrap"
type="button"
className={buttonClass(lineWrap)}
onClick={() => setLineWrap((value) => !value)}
title={lineWrap ? "Disable line wrapping" : "Enable line wrapping"}
aria-pressed={lineWrap}
>
{lineWrap ? "Wrap on" : "Wrap lines"}
</button>
<div key="view" className="inline-flex gap-1" aria-label="Diff comparison">
<button
key="working-tree"
type="button"
className={buttonClass(effectiveView === "working-tree")}
onClick={() => {
viewTouchedRef.current = true;
setView("working-tree");
}}
>
Working tree
</button>
<button
key="head"
type="button"
className={buttonClass(effectiveView === "head")}
onClick={() => {
viewTouchedRef.current = true;
setView("head");
}}
>
Against ref
</button>
</div>
{view === "head" ? (
<input
key="base-ref"
className="h-8 w-40 rounded-md border border-border bg-background px-2.5 font-mono text-xs outline-none transition-colors placeholder:text-muted-foreground focus:border-foreground/40"
value={baseRef}
onChange={(event) => {
baseRefTouchedRef.current = true;
setBaseRef(event.target.value);
}}
placeholder="origin/master"
aria-label="Base ref"
/>
) : null}
{view === "working-tree" ? (
<button
key="untracked"
type="button"
className={buttonClass(includeUntracked)}
onClick={() => setIncludeUntracked((value) => !value)}
>
{includeUntracked ? "Untracked shown" : "Show untracked"}
</button>
) : null}
<button
key="refresh"
type="button"
className={iconButtonClass(false)}
onClick={() => refresh()}
title="Refresh changes"
aria-label="Refresh changes"
>
<RefreshCwIcon />
</button>
</div>
</div>
{loading ? (
<LoadingState />
) : error ? (
<ErrorState message={error.message} onRetry={refresh} />
) : files.length === 0 ? (
<EmptyState />
) : (
<div key="content" className="flex flex-col gap-3 lg:h-[70vh] lg:min-h-[560px] lg:max-h-[820px] lg:flex-row">
<aside
key="files"
className="relative flex min-w-0 flex-col border border-border bg-background lg:h-full lg:shrink-0 lg:overflow-hidden"
style={fileSidebarStyle}
>
<div key="heading" className="border-b border-border px-3 py-2 text-xs font-medium uppercase tracking-[0.14em] text-muted-foreground">
Files
</div>
<div key="list" className="max-h-[70vh] overflow-auto lg:max-h-none lg:flex-1">
{files.map((file, index) => (
<FileRow
key={`${file.path}:${index}`}
file={file}
active={file.path === selectedFile?.path}
expanded={expandedFiles.has(file.path)}
onSelect={() => selectFile(file.path)}
onToggle={() => setExpandedFiles((current) => nextExpandedFileSet(current, file.path))}
onCopy={() => void copyPath(file.path)}
/>
))}
</div>
<div
role="separator"
aria-label="Resize file list"
aria-orientation="vertical"
aria-valuemin={MIN_FILE_SIDEBAR_WIDTH}
aria-valuemax={MAX_FILE_SIDEBAR_WIDTH}
aria-valuenow={fileSidebarWidth}
tabIndex={0}
className={[
"absolute inset-y-0 right-0 z-20 hidden w-3 cursor-col-resize touch-none outline-none lg:block",
"before:absolute before:inset-y-0 before:left-1/2 before:w-px before:-translate-x-1/2 before:bg-transparent before:transition-colors",
"hover:before:bg-border focus-visible:before:bg-ring",
fileSidebarResizing ? "before:bg-ring" : "",
].join(" ")}
onPointerDown={handleFileSidebarPointerDown}
onPointerMove={handleFileSidebarPointerMove}
onPointerUp={endFileSidebarResize}
onPointerCancel={endFileSidebarResize}
onLostPointerCapture={endFileSidebarResize}
onKeyDown={handleFileSidebarKeyDown}
/>
</aside>
<main
key="diffs"
ref={diffScrollRef}
className="max-h-[70vh] min-w-0 flex-1 space-y-3 overflow-auto lg:h-full lg:max-h-none lg:pr-1"
onScroll={handleDiffScroll}
>
{files
.map((file, index) => (
<section
key={`${file.path}:${index}`}
ref={setFileSectionRef(file.path)}
className={file.path === selectedFile?.path ? "scroll-mt-2" : undefined}
>
<div
key="header"
className="sticky top-0 z-30 flex min-w-0 items-center justify-between gap-3 border border-b-0 border-border bg-background px-3 py-2 shadow-sm"
>
<div key="left" className="flex min-w-0 items-start gap-2">
<button
key="collapse"
type="button"
className="mt-0.5 text-muted-foreground hover:text-foreground"
title={expandedFiles.has(file.path) ? "Collapse file" : "Expand file"}
aria-label={expandedFiles.has(file.path) ? `Collapse ${file.path}` : `Expand ${file.path}`}
onClick={() => setExpandedFiles((current) => nextExpandedFileSet(current, file.path))}
>
{expandedFiles.has(file.path) ? "−" : "+"}
</button>
<button
key="select"
type="button"
className="min-w-0 text-left"
onClick={() => selectFile(file.path)}
>
<div key="path" className="truncate text-sm font-medium">{file.path}</div>
{file.oldPath ? (
<div key="old-path" className="truncate font-mono text-[11px] text-muted-foreground">
from {file.oldPath}
</div>
) : null}
</button>
</div>
<div key="actions" className="flex shrink-0 items-center gap-1">
<button
key="copy"
type="button"
className={iconButtonClass(false)}
title="Copy path"
aria-label={`Copy ${file.path}`}
onClick={() => void copyPath(file.path)}
>
⧉
</button>
</div>
</div>
{expandedFiles.has(file.path) ? (
<FileDiffPanel key="diff" file={file} mode={mode} lineWrap={lineWrap} />
) : (
<CollapsedFilePanel
key="collapsed"
file={file}
onExpand={() => setExpandedFiles((current) => nextExpandedFileSet(current, file.path))}
/>
)}
</section>
))}
</main>
</div>
)}
</div>
);
}