agent_backend/components/ui/marker.tsx

import * as React from 'react';
import { mergeProps } from '@base-ui/react/merge-props';
import { useRender } from '@base-ui/react/use-render';
import { cva, type VariantProps } from 'class-variance-authority';

import { cn } from '@/lib/utils';

const markerVariants = cva(
  "gap-2 text-sm text-muted-foreground [a]:hover:text-foreground [a]:underline-offset-3 [a]:underline [&_svg:not([class*='size-'])]:size-4 min-h-4 text-left group/marker relative flex w-full items-center",
  {
    variants: {
      variant: {
        default: '',
        separator:
          'before:h-px before:min-w-0 before:flex-1 before:bg-border after:h-px after:min-w-0 after:flex-1 after:bg-border before:mr-1 after:ml-1',
        border: 'border-b border-border pb-2',
      },
    },
  },
);

function Marker({
  className,
  variant = 'default',
  render,
  ...props
}: useRender.ComponentProps<'div'> & VariantProps<typeof markerVariants>) {
  return useRender({
    defaultTagName: 'div',
    props: mergeProps<'div'>(
      {
        className: cn(markerVariants({ variant, className })),
      },
      props,
    ),
    render,
    state: {
      slot: 'marker',
      variant,
    },
  });
}

function MarkerIcon({ className, ...props }: React.ComponentProps<'span'>) {
  return (
    <span
      data-slot="marker-icon"
      aria-hidden="true"
      className={cn(
        "size-4 [&_svg:not([class*='size-'])]:size-4 shrink-0",
        className,
      )}
      {...props}
    />
  );
}

function MarkerContent({ className, ...props }: React.ComponentProps<'span'>) {
  return (
    <span
      data-slot="marker-content"
      className={cn(
        'group-data-[variant=separator]/marker:flex-none group-data-[variant=separator]/marker:text-center *:[a]:hover:text-foreground *:[a]:underline *:[a]:underline-offset-3 min-w-0 wrap-break-word',
        className,
      )}
      {...props}
    />
  );
}

export { Marker, MarkerIcon, MarkerContent, markerVariants };