File Diff

1"use client";
2// beui.dev/components/agents/file-diff
3 
4import {
5  Check,
6  ChevronDown,
7  Copy,
8  FileCode2,
9  LoaderCircle,
10} from "lucide-react";
11import { motion, useReducedMotion } from "motion/react";
12import {
13  type ReactNode,
14  useCallback,
15  useEffect,
16  useId,
17  useLayoutEffect,
18  useRef,
19  useState,
20} from "react";
21import {
22  type AgentCodeLanguage,
23  AgentCodeLine,
24  useAgentCodeTokens,
25} from "@/components/agents/agent-code";
26import { AgentDisclosure } from "@/components/agents/agent-disclosure";
27import { SPRING_PRESS, SPRING_SWAP } from "@/lib/ease";
28import { cn } from "@/lib/utils";
29 
30export type FileDiffStatus = "streaming" | "complete";
31export type FileDiffLineType = "added" | "removed" | "context";
32 
33export interface FileDiffLine {
34  id: string;
35  type?: FileDiffLineType;
36  oldLine?: number;
37  newLine?: number;
38  content: string;
39}
40 
41export interface FileDiffProps {
42  file: ReactNode;
43  lines: FileDiffLine[];
44  status?: FileDiffStatus;
45  open?: boolean;
46  defaultOpen?: boolean;
47  onOpenChange?: (open: boolean) => void;
48  collapseOnComplete?: boolean;
49  maxHeight?: number;
50  language?: AgentCodeLanguage;
51  copyText?: string;
52  onCopy?: () => void | Promise<void>;
53  className?: string;
54}
55 
56function ChangeCount({ value, type }: { value: number; type: "added" | "removed" }) {
57  if (!value) return null;
58  return (
59    <span
60      className={cn(
61        "font-mono text-xs tabular-nums",
62        type === "added"
63          ? "text-emerald-600 dark:text-emerald-400"
64          : "text-rose-600 dark:text-rose-400",
65      )}
66    >
67      {type === "added" ? "+" : "−"}
68      {value}
69    </span>
70  );
71}
72 
73export function FileDiff({
74  file,
75  lines,
76  status = "streaming",
77  open,
78  defaultOpen = true,
79  onOpenChange,
80  collapseOnComplete = true,
81  maxHeight = 220,
82  language = "typescript",
83  copyText,
84  onCopy,
85  className,
86}: FileDiffProps) {
87  const reduce = useReducedMotion() ?? false;
88  const baseId = useId();
89  const triggerId = `${baseId}-trigger`;
90  const contentId = `${baseId}-content`;
91  const viewportRef = useRef<HTMLDivElement>(null);
92  const previousStatus = useRef(status);
93  const copyTimer = useRef<number | undefined>(undefined);
94  const [copied, setCopied] = useState(false);
95  const [internalOpen, setInternalOpen] = useState(defaultOpen);
96  const currentOpen = open ?? internalOpen;
97  const streaming = status === "streaming";
98  const additions = lines.filter((line) => line.type === "added").length;
99// … truncated