Git branch, dirty and stash state in Bash prompt.

directory-and-git-state.sh

# Tweak presentation and add commits ahead/behind.
# Quick fork by @mcjim to add stash status and tweak to suit his style.
# http://henrik.nyh.se/2008/12/git-dirty-prompt
# http://www.simplisticcomplexity.com/2008/03/13/show-your-git-branch-name-in-your-prompt/
#   host dir master $   # clean working directory
#   host dir master* $  # dirty working directory
#   host dir master*^ $  # dirty working directory with stash
#   host dir master^ $  # clean working directory with stash

function parse_git_dirty {
  status=$(git status --porcelain -b 2> /dev/null)
  aheadRegex="ahead ([0-9]+)"
  behindRegex="behind ([0-9]+)"

  [[ $status =~ $aheadRegex ]] && ahead="${BASH_REMATCH[1]}" || ahead="0"
  [[ $status =~ $behindRegex ]] && behind="${BASH_REMATCH[1]}" || behind="0"

  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit, working directory clean" ]] && echo -n ", dirty"
  [[ $ahead != "0" ]] && echo -n ", ↑${ahead}"
  [[ $behind != "0" ]] && echo -n ", ↓${behind}"
}
function parse_git_stash {
  [[ $(git stash list 2> /dev/null | tail -n1) != "" ]] && echo " \/ stash"
}
function parse_git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/\1$(parse_git_dirty)$(parse_git_stash)/"
}
PS1='\[\e[0;33m\]${HOSTNAME}\[\e[m\]  |  \W  |  \[\e[0;36m\]$(parse_git_branch)\[\e[m\]\n${USER} $ '