dotfiles @ 924e5620b7a1f6a6187b406508edc84b062f545f

function prompt_vcs

  set -l dir $PWD

  set -l depth 0

  while test "$dir" != / # -a $depth -lt 20

    if test -d "$dir/.jj"

      _prompt_vcs_jj

      return

    else if test -d "$dir/.git"

      _prompt_vcs_git $dir

      return

    end

    set dir (path dirname $dir)

  end

end

function _prompt_vcs_seg -a label

  printf '%s%s%s' (set_color normal) (set_color blue) $label (set_color normal) (set_color normal)

end

function _prompt_vcs_jj

  command -sq jj; or return

  set -l head (jj log --no-graph -r @ -T 'change_id.shortest()' 2>/dev/null)

  test -n "$head"; and _prompt_vcs_seg "jj: $head"

end

function _prompt_vcs_git -a root

  set -l git_dir "$root/.git"

  if test -f "$git_dir"

    read -l gitdir_line < "$git_dir"

    set git_dir (string replace 'gitdir: ' '' -- $gitdir_line)

  end

  set -l head_file "$git_dir/HEAD"

  test -f "$head_file"; or return

  read -l head < "$head_file"

  set -l m (string match -r '^ref: refs/heads/(.*)' -- $head)

  if test -n "$m[2]"

    _prompt_vcs_seg $m[2]

  else

    _prompt_vcs_seg (string sub -l 7 -- $head)

  end

end