manifold/web/components/avatar.tsx

import Router from 'next/router'
import clsx from 'clsx'
import { UserCircleIcon } from '@heroicons/react/solid'

export function Avatar(props: {
  username?: string
  avatarUrl?: string
  noLink?: boolean
  size?: number | 'xs' | 'sm'
  className?: string
}) {
  const { username, avatarUrl, noLink, size, className } = props
  const s = size == 'xs' ? 6 : size === 'sm' ? 8 : size || 10

  const onClick =
    noLink && username
      ? undefined
      : (e: any) => {
          e.stopPropagation()
          Router.push(`/${username}`)
        }

  // there can be no avatar URL or username in the feed, we show a "submit comment"
  // item with a fake grey user circle guy even if you aren't signed in
  return avatarUrl ? (
    <img
      className={clsx(
        'flex-shrink-0 rounded-full rounded-full bg-white object-cover',
        `w-${s} h-${s}`,
        !noLink && 'cursor-pointer',
        className
      )}
      src={avatarUrl}
      onClick={onClick}
      alt={username}
    />
  ) : (
    <UserCircleIcon
      className={clsx(
        `flex-shrink-0 rounded-full bg-white w-${s} h-${s} text-gray-500`,
        className
      )}
      aria-hidden="true"
    />
  )
}