fish_prompt.fish

# A lambda (λ) prompt.
#
# Yellow and red depending on exit status.
# Underlined if git status is dirty.
# Uppercase (Λ) if ahead of the remote.

#left hand side prompt
function fish_prompt
    if is_status_okay
        set_color yellow
    else
        set_color red
    end

    if is_git_dirty
        set_color --underline
    end

    if is_git_ahead
        echo -n 'Λ'
    else
        echo -n 'λ'
        set_color normal
    end
    set_color normal
    echo -n ' '
end

function fish_right_prompt
    set_color black
    echo "░▒▓█"
    set_color brcyan --background black
    # Show directory name
    echo -n (dirname (prompt_pwd))/
    # show directory in red if not writeable, otherwise highlight the basename of directory
    if not [ -w (pwd) ]
        set_color red
    else
        set_color cyan
    end
    echo -n (basename (prompt_pwd))
    echo -n " "
    # Show length of command execution in seconds
    if test $CMD_DURATION
        set duration (echo "$CMD_DURATION 1000" | awk '{printf "%.3fs", $1 / $2}')
        set_color yellow --background black
        echo -n "Ω$duration"
        set_color normal
    end
end

#right hand side prompt
#  function fish_right_prompt
#  set_color brblack
#  echo -n (hostname | cut -d . -f 1)
#  echo -n '|'
#  set_color $fish_color_cwd
#  echo -n (prompt_pwd)
#  set_color normal
#  echo -n ' '

#  if is_git
#    set_color magenta
#    echo -n (git_branch)' '
#    set_color normal
#  end
#end

#git functions
function git_branch
    if is_git
        echo (git rev-parse --abbrev-ref HEAD 2> /dev/null)
    end
end

function is_git
    git symbolic-ref HEAD >/dev/null 2>&1
end

function is_git_ahead
    set -l revs (git rev-list origin/(git_branch)..HEAD ^ /dev/null)
    [ "$revs" != "" ]
end

function is_git_dirty
    is_git
    and [ (git status | tail -n1) != "nothing to commit, working tree clean" ]
end

function is_status_okay
    [ $status = 0 ]
end