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import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';
import { CheckIcon, CopyIcon } from 'lucide-react';
import {
type ComponentProps,
createContext,
type HTMLAttributes,
useContext,
useEffect,
useRef,
useState,
} from 'react';
import { type BundledLanguage, codeToHtml, type ShikiTransformer } from 'shiki';
type CodeBlockProps = HTMLAttributes<HTMLDivElement> & {
code: string;
language: BundledLanguage;
showLineNumbers?: boolean;
};
type CodeBlockContextType = {
code: string;
};
const CodeBlockContext = createContext<CodeBlockContextType>({
code: '',
});
const lineNumberTransformer: ShikiTransformer = {
name: 'line-numbers',
line(node, line) {
node.children.unshift({
type: 'element',
tagName: 'span',
properties: {
className: [
'inline-block',
'min-w-10',
'mr-4',
'text-right',
'select-none',
'text-muted-foreground',
],
},
children: [{ type: 'text', value: String(line) }],
});
},
};
export async function highlightCode(
code: string,
language: BundledLanguage,
showLineNumbers = false,
) {
const transformers: ShikiTransformer[] = showLineNumbers ? [lineNumberTransformer] : [];
return await Promise.all([
codeToHtml(code, {
lang: language,
theme: 'one-light',
transformers,
}),
codeToHtml(code, {
lang: language,
theme: 'one-dark-pro',
transformers,
}),
]);
}
export const CodeBlock = ({
code,
language,
showLineNumbers = false,
className,
children,
...props
}: CodeBlockProps) => {
const [html, setHtml] = useState<string>('');
const [darkHtml, setDarkHtml] = useState<string>('');
const mounted = useRef(false);
useEffect(() => {
highlightCode(code, language, showLineNumbers).then(([light, dark]) => {
if (!mounted.current) {
setHtml(light);
setDarkHtml(dark);
mounted.current = true;
}
});
return () => {
mounted.current = false;
};
}, [code, language, showLineNumbers]);
return (
<CodeBlockContext.Provider value={{ code }}>
<div
className={cn(
'group relative w-full overflow-hidden rounded-md border bg-background text-foreground',
className,
)}
{...props}
>
<div className="relative">
<div
className="overflow-auto dark:hidden [&>pre]:m-0 [&>pre]:bg-background! [&>pre]:p-4 [&>pre]:text-foreground! [&>pre]:text-sm [&_code]:font-mono [&_code]:text-sm"
// biome-ignore lint/security/noDangerouslySetInnerHtml: "this is needed."
dangerouslySetInnerHTML={{ __html: html }}
/>
<div
className="hidden overflow-auto dark:block [&>pre]:m-0 [&>pre]:bg-background! [&>pre]:p-4 [&>pre]:text-foreground! [&>pre]:text-sm [&_code]:font-mono [&_code]:text-sm"
// biome-ignore lint/security/noDangerouslySetInnerHtml: "this is needed."
dangerouslySetInnerHTML={{ __html: darkHtml }}
/>
{children && (
<div className="absolute top-2 right-2 flex items-center gap-2">{children}</div>
)}
</div>
</div>
</CodeBlockContext.Provider>
);
};
export type CodeBlockCopyButtonProps = ComponentProps<typeof Button> & {
onCopy?: () => void;
onError?: (error: Error) => void;
timeout?: number;
};
export const CodeBlockCopyButton = ({
onCopy,
onError,
timeout = 2000,
children,
className,
...props
}: CodeBlockCopyButtonProps) => {
const [isCopied, setIsCopied] = useState(false);
const { code } = useContext(CodeBlockContext);
const copyToClipboard = async () => {
if (typeof window === 'undefined' || !navigator?.clipboard?.writeText) {
onError?.(new Error('Clipboard API not available'));
return;
}
try {
await navigator.clipboard.writeText(code);
setIsCopied(true);
onCopy?.();
setTimeout(() => setIsCopied(false), timeout);
} catch (error) {
onError?.(error as Error);
}
};
const Icon = isCopied ? CheckIcon : CopyIcon;
return (
<Button
className={cn('shrink-0', className)}
onClick={copyToClipboard}
size="icon"
variant="ghost"
{...props}
>
{children ?? <Icon size={14} />}
</Button>
);
};
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