.bash_prompt

#!/usr/bin/env bash

# Based on:
# @gf3’s Sexy Bash Prompt, inspired by “Extravagant Zsh Prompt”
# Shamelessly copied from https://github.com/gf3/dotfiles
# Screenshot: http://i.imgur.com/s0Blh.png

if [[ $COLORTERM = gnome-* && $TERM = xterm ]] && infocmp gnome-256color >/dev/null 2>&1; then
  export TERM=gnome-256color
elif infocmp xterm-256color >/dev/null 2>&1; then
  export TERM=xterm-256color
fi

if tput setaf 1 &> /dev/null; then
  tput sgr0
  RED=$(tput setaf 1)
  GREEN=$(tput setaf 2)
  YELLOW=$(tput setaf 3)
  BLUE=$(tput setaf 4)
  MAGENTA=$(tput setaf 5)
  CYAN=$(tput setaf 6)
  WHITE=$(tput setaf 7)
  BOLD=$(tput bold)
  RESET=$(tput sgr0)
else
  RED="\033[1;31m"
  GREEN="\033[1;32m"
  YELLOW="\033[1;33m"
  BLUE="\033[1;34m"
  MAGENTA="\033[1;35m"
  CYAN="\033[1;36m"
  WHITE="\033[1;37m"
  BOLD=""
  RESET="\033[m"
fi

export RED
export GREEN
export YELLOW
export BLUE
export MAGENTA
export CYAN
export WHITE
export BOLD
export RESET

# check whether printf supports -v
__git_printf_supports_v=
printf -v __git_printf_supports_v -- '%s' yes >/dev/null 2>&1

__scm_prompt() {
  if [ "$TERM_PROGRAM" == "Apple_Terminal" ] && [ -z "$INSIDE_EMACS" ]; then
    # Identify the directory using a "file:" scheme URL,
    # including the host name to disambiguate local vs.
    # remote connections. Percent-escape spaces.
    local SEARCH=' '
    local REPLACE='%20'
    local PWD_URL="file://$HOSTNAME${PWD//$SEARCH/$REPLACE}"
    printf '\e]7;%s\a' "$PWD_URL"
  fi

    local pcmode=no
  local ps1pc_start='\u@\h:\w '
  local ps1pc_end='\$ '
  local printf_format=' \[$YELLOW\][\[$RESET\]%s\[$YELLOW\]]\[$RESET\]'

  case "$#" in
    2|3)  pcmode=yes
      ps1pc_start="$1"
      ps1pc_end="$2"
      printf_format="${3:-$printf_format}"
    ;;
    0|1)  printf_format="${1:-$printf_format}"
    ;;
    *)  return
    ;;
  esac

  local git_repo_info
  git_repo_info="$(git rev-parse --git-dir 2> /dev/null)"

  if [ -n "$git_repo_info" ]; then
    local index_added=0 index_modified=0 index_deleted=0
    local working_added=0 working_modified=0 working_deleted=0
    local branch_status
    local git_status line x y

    IFS=$'\n'
    git_status="$(git status --branch --porcelain 2> /dev/null)"

    for line in $git_status; do
      x=${line:0:1}; y=${line:1:1};
      if [[ $x = '?' ]]; then
        let working_added++
      elif [[ $x = '#' && $y = '#' ]]; then
        branch_status=${line:3}
      else
        [[ $x = 'A' ]] && let index_added++
        [[ $x = 'M' ]] && let index_modified++
        [[ $x = 'D' ]] && let index_deleted++
        [[ $y = 'M' ]] && let working_modified++
        [[ $y = 'D' ]] && let working_deleted++
      fi
    done

    local status_info="git:";
    if [[ $branch_status =~ "[ahead" ]]; then
      status_info+="\[$GREEN\]"
    elif [[ $branch_status =~ "[behind" ]]; then
      status_info+="\[$RED\]"
    else
      status_info+="\[$CYAN\]"
    fi
    status_info+=$(echo $branch_status | sed -e 's/\.\{3\}.*//');
    status_info+="\[$RESET\]"

    if [[ index_added -gt 0 || index_modified -gt 0 || index_deleted -gt 0 ]]; then
      status_info+="\[$GREEN\]"
      status_info+=" +$index_added"
      status_info+=" ~$index_modified"
      status_info+=" -$index_deleted"
      status_info+="\[$RESET\]"
    fi
    if [[ working_added -gt 0 || working_modified -gt 0 || working_deleted -gt 0 ]]; then
      status_info+="\[$RED\]"
      status_info+=" +$working_added"
      status_info+=" ~$working_modified"
      status_info+=" -$working_deleted"
      status_info+="\[$RESET\]"
    fi

    if [ $pcmode = yes ]; then
      if [ "${__git_printf_supports_v-}" != yes ]; then
        status_info=$(printf -- "$printf_format" "$status_info")
      else
        printf -v status_info -- "$printf_format" "$status_info"
      fi
      PS1="$ps1pc_start$status_info$ps1pc_end"
    else
      printf -- "$printf_format" "$status_info"
    fi
  elif [ $pcmode = yes ]; then
    #In PC mode PS1 always needs to be set
    PS1="$ps1pc_start$ps1pc_end"
  fi
}

PROMPT_COMMAND='__scm_prompt "\u@\h:\w" "\\\$ "'