LibreChat/client/src/components/Messages/Content/CodeBlock.tsx

import copy from 'copy-to-clipboard';
import { InfoIcon } from 'lucide-react';
import React, { useRef, useState, RefObject } from 'react';
import Clipboard from '~/components/svg/Clipboard';
import CheckMark from '~/components/svg/CheckMark';
import useLocalize from '~/hooks/useLocalize';
import cn from '~/utils/cn';

type CodeBarProps = {
  lang: string;
  codeRef: RefObject<HTMLElement>;
  plugin?: boolean;
  error?: boolean;
};

type CodeBlockProps = Pick<CodeBarProps, 'lang' | 'plugin' | 'error'> & {
  codeChildren: React.ReactNode;
  classProp?: string;
};

const CodeBar: React.FC<CodeBarProps> = React.memo(({ lang, codeRef, error, plugin = null }) => {
  const localize = useLocalize();
  const [isCopied, setIsCopied] = useState(false);
  return (
    <div className="relative flex items-center rounded-tl-md rounded-tr-md bg-gray-700 px-4 py-2 font-sans text-xs text-gray-200 dark:bg-gray-700">
      <span className="">{lang}</span>
      {plugin === true ? (
        <InfoIcon className="ml-auto flex h-4 w-4 gap-2 text-white/50" />
      ) : (
        <button
          type="button"
          className={cn(
            'ml-auto flex gap-2',
            error === true ? 'h-4 w-4 items-start text-white/50' : '',
          )}
          onClick={async () => {
            const codeString = codeRef.current?.textContent;
            if (codeString != null) {
              setIsCopied(true);
              copy(codeString, { format: 'text/plain' });

              setTimeout(() => {
                setIsCopied(false);
              }, 3000);
            }
          }}
        >
          {isCopied ? (
            <>
              <CheckMark className="h-[18px] w-[18px]" />
              {error === true ? '' : localize('com_ui_copied')}
            </>
          ) : (
            <>
              <Clipboard />
              {error === true ? '' : localize('com_ui_copy_code')}
            </>
          )}
        </button>
      )}
    </div>
  );
});

const CodeBlock: React.FC<CodeBlockProps> = ({
  lang,
  codeChildren,
  classProp = '',
  plugin = null,
  error,
}) => {
  const codeRef = useRef<HTMLElement>(null);
  const language = plugin || error ? 'json' : lang;

  return (
    <div className="w-full rounded-md bg-gray-900 text-xs text-white/80">
      <CodeBar lang={lang} codeRef={codeRef} plugin={!!plugin} error={error} />
      <div className={cn(classProp, 'overflow-y-auto p-4')}>
        <code
          ref={codeRef}
          className={cn(
            plugin || error ? '!whitespace-pre-wrap' : `hljs language-${language} !whitespace-pre`,
          )}
        >
          {codeChildren}
        </code>
      </div>
    </div>
  );
};

export default CodeBlock;