Code Block

1"use client";
2// beui.dev/components/agents/code-block
3 
4import { Check, Copy, FileCode2, LoaderCircle } from "lucide-react";
5import { motion, useReducedMotion } from "motion/react";
6import {
7  type ReactNode,
8  useCallback,
9  useEffect,
10  useLayoutEffect,
11  useMemo,
12  useRef,
13  useState,
14} from "react";
15import {
16  type AgentCodeLanguage,
17  AgentCodeLine,
18  useAgentCodeTokens,
19} from "@/components/agents/agent-code";
20import { SPRING_PRESS } from "@/lib/ease";
21import { cn } from "@/lib/utils";
22 
23export type CodeBlockStatus = "streaming" | "complete";
24 
25export interface CodeBlockProps {
26  code: string;
27  language?: AgentCodeLanguage;
28  filename?: ReactNode;
29  status?: CodeBlockStatus;
30  showLineNumbers?: boolean;
31  highlightLines?: number[];
32  maxHeight?: number;
33  wrap?: boolean;
34  copyable?: boolean;
35  onCopy?: () => void | Promise<void>;
36  className?: string;
37}
38 
39export function CodeBlock({
40  code,
41  language = "typescript",
42  filename,
43  status = "complete",
44  showLineNumbers = true,
45  highlightLines = [],
46  maxHeight = 280,
47  wrap = false,
48  copyable = true,
49  onCopy,
50  className,
51}: CodeBlockProps) {
52  const reduce = useReducedMotion() ?? false;
53  const viewportRef = useRef<HTMLDivElement>(null);
54  const copyTimer = useRef<number | undefined>(undefined);
55  const [copied, setCopied] = useState(false);
56  const streaming = status === "streaming";
57  const tokens = useAgentCodeTokens(code, language);
58  const highlighted = useMemo(
59    () => new Set(highlightLines),
60    [highlightLines],
61  );
62  let offset = 0;
63  const lines = code.split("\n").map((content) => {
64    const line = { content, offset };
65    offset += content.length + 1;
66    return line;
67  });
68 
69  useEffect(
70    () => () => {
71      if (copyTimer.current) window.clearTimeout(copyTimer.current);
72    },
73    [],
74  );
75 
76  useLayoutEffect(() => {
77    const viewport = viewportRef.current;
78    if (!viewport || !streaming) return;
79 
80    const frame = requestAnimationFrame(() => {
81      if (viewport.scrollHeight <= viewport.clientHeight) return;
82      if (typeof viewport.scrollTo === "function") {
83        viewport.scrollTo({
84          top: viewport.scrollHeight,
85          behavior: reduce ? "auto" : "smooth",
86        });
87      } else {
88        viewport.scrollTop = viewport.scrollHeight;
89      }
90    });
91    return () => cancelAnimationFrame(frame);
92  });
93 
94  const handleCopy = useCallback(async () => {
95    if (onCopy) await onCopy();
96    else await navigator.clipboard?.writeText(code);
97 
98    setCopied(true);
99// … truncated