prompt.fish

#!/usr/bin/env fish
# -*- coding: utf-8 -*-

# prompt
function fish_prompt
  echo "\e[0;31mλ>\e[0m "
end

# NOTE: used to track prev command for pre-exec
set -g _PREV_CMD ""

# pre-exec handler
# if command is empty, print the current directory

function fish_preexec --on-event fish_preexec
  # NOTE: use regex to extract command ONLY
  # from last entry in history

  set -g _PREV_CMD (string match -r '^[A-Za-z]*' $argv)

  #? debug
  # echo "set _PREV_CMD '$_PREV_CMD'"
end

function fish_preprompt --on-event fish_prompt
  if test $_PREV_CMD = "" -o $_PREV_CMD = "where" -o $_PREV_CMD = "cd" -o $_PREV_CMD = "clear"
    # echo (pwd)
    echo "\e[0;31m$(pwd)\e[0m"
  end

  #? reset prev CMD
  set -g _PREV_CMD ""
end






####

# set --path -a NESTED_FISH_LABELS

# function fish_prompt
#   set -l command_status $status
#   set -l question_mark_in_circle '?'\u20dd

#   set -l color_orange (set_color DE935F brred) # base16 color 09
#   set -l color_brown (set_color A3685A)        # base16 color 0F

#   # print hostname if client is remote
#   set_color red
#   if set -q SSH_TTY
#     echo -n '@'(hostname)' '
#   else
#     echo -n '# '
#   end

#   # print nesting
#   if test (count $NESTED_FISH_LABELS) -gt 0
#     echo -ns '[' (set_color yellow) \
#       (string join (set_color red)/(set_color yellow) $NESTED_FISH_LABELS) \
#       (set_color red) '] '
#   end

#   # print current location
#   if [ "$PWD" = "$HOME" ]
#     set_color green; echo -n '~'
#   else
#     set -l parent_dir (dirname "$PWD")
#     set_color blue
#     if [ "$parent_dir" = "$HOME" ]
#       echo -n '~'
#     else
#       echo -n (basename "$parent_dir")
#     end
#     echo -n ' → '
#     set_color green; echo -n (basename "$PWD")
#   end
#   echo -n ' '

#   # show some pretty git information if we're in a git repo
#   set -l is_git_worktree (git rev-parse --is-inside-work-tree 2>/dev/null)
#   if test "$is_git_worktree" = true
#     if git rev-parse '@{u}' >/dev/null 2>&1
#       # if an upstream is set, check how far ahead/behind the branch is
#       set -l git_commits_ahead (git rev-list '@{u}..HEAD' | wc -l | awk '{print $1}')
#       set -l git_commits_behind (git rev-list 'HEAD..@{u}' | wc -l | awk '{print $1}')
#       if [ \( "$git_commits_ahead" -eq 0 \) -a \( "$git_commits_behind" -eq 0 \) ]
#         set_color blue; echo -n '⦿'
#       else
#         if [ "$git_commits_behind" -gt 0 ]
#           set_color red; echo -n "↓$git_commits_behind"
#         end
#         if [ "$git_commits_ahead" -gt 0 ]
#           echo -n "$color_orange↑$git_commits_ahead"
#         end
#       end
#     else
#       # otherwise, indicate that an upstream is unknown
#       echo -n "$color_orange$question_mark_in_circle"
#     end

#     set -l git_branch (git branch 2>/dev/null | sed -n '/\* /s///p')
#     if test -n "$git_branch"
#       set_color blue; echo -n ' ['
#       # color the branch name differently if the working tree is dirty
#       if [ (count (git status --porcelain)) -gt 0 ]
#         echo -n "$color_orange"
#       else
#         set_color yellow
#       end
#       echo -n "$git_branch"
#       set_color blue; echo -n '] '
#     end
#   end

#   if [ "$command_status" -eq 0 ]
#     echo -n $color_brown'λ: '
#   else
#     set_color red; echo -n 'λ! '
#   end
#   set_color normal
# end