bash_git_prompt

#!/bin/bash

########################################################################
# Create a custom prompt with some useful Git info 
########################################################################

# here is a specific bash (no zsh) customized git prompt
# it does less than provided git-prompt (https://raw.githubusercontent.com/git/git/master/contrib/completion/git-prompt.sh) but tries to be faster

# Load some colors constants
source ~/pretty-git-for-bash/bash_colors
source ~/pretty-git-for-bash/bash_unicode_chars

# Be sure to use a unicode compliant locale (to be able to display unicode chars in Prompt)
export LC_ALL="en_US.UTF-8"
export LC_CTYPE="en_US.UTF-8"
export LANG="en_US.UTF-8"
export LANGUAGE="en_US.UTF-8"

# Parse 'git status' result and put some info in PS1 prompt.
function parse_git_status {
  git rev-parse --git-dir &> /dev/null
  git_status="$(git status 2> /dev/null)"

  # check if current directory is a git dir (if true, 'git status' must contain "On branch xxx")
  if [[ ! -z `echo "${git_status}" | grep "On branch"` ]]; then
    branch_name=`echo "${git_status}" | grep "On branch" | sed "s/.*On branch \(.*\)/\1/"`

    # check if local branch is ahead/behing of remote branch, or if both have diverged.
    if [[ ! -z `echo "${git_status}" | grep "have diverged"` ]]; then
      remote=" ${BG_GREEN_FG_PURPLE}<>"
    else
      if [[ ! -z `echo "${git_status}" | grep "ahead"` ]]; then
        remote=" ${BG_GREEN_FG_BLUE}>"
      else
        if [[ ! -z `echo "${git_status}" | grep "behind"` ]]; then
          remote=" ${BG_GREEN_FG_BLUE}<"
        fi
      fi
    fi
    
    # check if we are working on clean directory (no untracked file) or not
    if [[ ! ${git_status}} == *"working directory clean"* ]]; then
      state="${BG_GREEN_FG_RED}¤"
    fi

    echo "${BG_GREEN_FG_BLACK} (${branch_name}${remote}${state}${BG_GREEN_FG_BLACK}) " 
  fi
}

function get_git_info {
  branch_name=`(git symbolic-ref HEAD 2> /dev/null || git rev-parse --short HEAD 2> /dev/null) | sed "s#refs/heads/##"`
  
  if [[ ! -z "$branch_name" ]]; then
    echo "${BG_GREEN_FG_BLACK} (${branch_name})"
  else
    echo ""
  fi
}

function prompt_func() {
  if [[ ! -z "$PRETTY_GIT_FAST_MODE" ]]; then
    PS1="${BG_YELLOW_FG_BLACK} \u@\h ${BG_BLUE_FG_WHITE} \W $(get_git_info)${COLOR_OFF} > "
  else
    PS1="${BG_YELLOW_FG_BLACK} \u@\h ${BG_BLUE_FG_WHITE} \W $(parse_git_status)${COLOR_OFF} > "
  fi
}

PROMPT_COMMAND=prompt_func