.gitprompt.sh

#!/bin/sh

function async_run()
{
  {
    $1 &> /dev/null
  }&
}

function git_prompt_dir()
{
  # assume the git-prompt-exe is in the same directory as this script
  # code thanks to http://stackoverflow.com/questions/59895
  if [ -z "${__GIT_PROMPT_DIR}" ]; then
    local SOURCE="${BASH_SOURCE[0]}"
    while [ -h "${SOURCE}" ]; do
      local DIR="$( cd -P "$( dirname "${SOURCE}" )" && pwd )"
      SOURCE="$(readlink "${SOURCE}")"
      [[ $SOURCE != /* ]] && SOURCE="${DIR}/${SOURCE}"
    done
    __GIT_PROMPT_DIR="$( cd -P "$( dirname "${SOURCE}" )" && pwd )"
  fi
}

function git_prompt_config()
{
  # Colors
  ResetColor="\[\033[0m\]"            # Text reset

  # Bold
  local BoldGreen="\[\033[1;32m\]"    # Green
  local BoldBlue="\[\033[1;34m\]"     # Blue

  # High Intensty
  local IntenseBlack="\[\033[0;90m\]" # Grey

  # Bold High Intensty
  local Magenta="\[\033[1;95m\]"      # Purple

  # Regular Colors
  local Yellow="\[\033[0;33m\]"
  local White='\[\033[37m\]'
  local Red="\[\033[0;31m\]"
  local Blue="\[\033[0;34m\]"

  # Default values for the appearance of the prompt. Configure at will.
  GIT_PROMPT_PREFIX="["
  GIT_PROMPT_SUFFIX="]"
  GIT_PROMPT_SEPARATOR="|"
  GIT_PROMPT_BRANCH_COLOR="${Magenta}"
  GIT_PROMPT_STAGED_COLOR="${Red}● "
  GIT_PROMPT_CONFLICTS_COLOR="${Red}✖ "
  GIT_PROMPT_CHANGED_COLOR="${Blue}✚ "
  GIT_PROMPT_REMOTE=" "
  GIT_PROMPT_UNTRACKED="…"
  GIT_PROMPT_CLEAN_COLOR="${BoldGreen}✔"

  # Various variables you might want for your PS1 prompt instead
  local Time12a="\$(date +%H:%M)"
  local PathShort="\w"

  if [ "x${GIT_PROMPT_START}" == "x" ]; then
    PROMPT_START="${BoldGreen}${PathShort}${ResetColor}"
  else
    PROMPT_START="${GIT_PROMPT_START}"
  fi

  if [ "x${GIT_PROMPT_END}" == "x" ]; then
    PROMPT_END=" \n${Blue}${Time12a}${ResetColor} $ "
  else
    PROMPT_END="${GIT_PROMPT_END}"
  fi

  EMPTY_PROMPT="${PROMPT_START}$($prompt_callback)${PROMPT_END}"

  # fetch remote revisions every other $GIT_PROMPT_FETCH_TIMEOUT (default 5) minutes
  GIT_PROMPT_FETCH_TIMEOUT=${1-5}
  if [ "x$__GIT_STATUS_CMD" == "x" ]
  then
    git_prompt_dir
    __GIT_STATUS_CMD="${__GIT_PROMPT_DIR}/git-prompt-exe"
  fi
}

function setGitPrompt() {

  local EMPTY_PROMPT
  local __GIT_STATUS_CMD

  git_prompt_config

  local repo=`git rev-parse --show-toplevel 2> /dev/null`
  if [[ ! -e "${repo}" ]]; then
    PS1="${EMPTY_PROMPT}"
    return
  fi

  checkUpstream
  updatePrompt
}

function checkUpstream() {
  local GIT_PROMPT_FETCH_TIMEOUT
  git_prompt_config

  local FETCH_HEAD="${repo}/.git/FETCH_HEAD"
  # Fech repo if local is stale for more than $GIT_FETCH_TIMEOUT minutes
  if [[ ! -e "${FETCH_HEAD}"  ||  -e `find "${FETCH_HEAD}" -mmin +${GIT_PROMPT_FETCH_TIMEOUT}` ]]
  then
    if [[ -n $(git remote show) ]]; then
      async_run "git fetch --quiet"
      disown
    fi
  fi
}

function updatePrompt() {
  local GIT_PROMPT_PREFIX
  local GIT_PROMPT_SUFFIX
  local GIT_PROMPT_SEPARATOR
  local GIT_PROMPT_BRANCH_COLOR
  local GIT_PROMPT_STAGED_COLOR
  local GIT_PROMPT_CONFLICTS_COLOR
  local GIT_PROMPT_CHANGED_COLOR
  local GIT_PROMPT_REMOTE
  local GIT_PROMPT_UNTRACKED
  local GIT_PROMPT_CLEAN_COLOR
  local PROMPT_START
  local PROMPT_END
  local EMPTY_PROMPT
  local ResetColor
  local Blue
  local GIT_PROMPT_FETCH_TIMEOUT
  local __GIT_STATUS_CMD

  git_prompt_config

  local -a GitStatus
  GitStatus=($("${__GIT_STATUS_CMD}" 2>/dev/null))

  local GIT_BRANCH=${GitStatus[0]}
  local GIT_REMOTE=${GitStatus[1]}
  if [[ "." == "$GIT_REMOTE" ]]; then
    unset GIT_REMOTE
  fi
  local GIT_STAGED=${GitStatus[2]}
  local GIT_CONFLICTS=${GitStatus[3]}
  local GIT_CHANGED=${GitStatus[4]}
  local GIT_UNTRACKED=${GitStatus[5]}
  local GIT_CLEAN=${GitStatus[6]}

  if [[ -n "${GitStatus}" ]]; then
    local STATUS=" ${GIT_PROMPT_PREFIX}${GIT_PROMPT_BRANCH_COLOR}${GIT_BRANCH}${ResetColor}"

    if [[ -n "${GIT_REMOTE}" ]]; then
      STATUS="${STATUS}${GIT_PROMPT_REMOTE}${GIT_REMOTE}${ResetColor}"
    fi

    STATUS="${STATUS}${GIT_PROMPT_SEPARATOR}"
    if [ "${GIT_STAGED}" -ne "0" ]; then
      STATUS="${STATUS}${GIT_PROMPT_STAGED_COLOR}${GIT_STAGED}${ResetColor}"
    fi

    if [ "${GIT_CONFLICTS}" -ne "0" ]; then
      STATUS="${STATUS}${GIT_PROMPT_CONFLICTS_COLOR}${GIT_CONFLICTS}${ResetColor}"
    fi

    if [ "${GIT_CHANGED}" -ne "0" ]; then
      STATUS="${STATUS}${GIT_PROMPT_CHANGED_COLOR}${GIT_CHANGED}${ResetColor}"
    fi

    if [ "${GIT_UNTRACKED}" -ne "0" ]; then
      STATUS="${STATUS}${GIT_PROMPT_UNTRACKED}${GIT_UNTRACKED}${ResetColor}"
    fi

    if [ "${GIT_CLEAN}" -eq "1" ]; then
      STATUS="${STATUS}${GIT_PROMPT_CLEAN_COLOR}"
    fi

    STATUS="${STATUS}${ResetColor}${GIT_PROMPT_SUFFIX}"


    PS1="${PROMPT_START}$($prompt_callback)${STATUS}${PROMPT_END}"
    if [[ -n "${VIRTUAL_ENV}" ]]; then
      PS1="${Blue}($(basename "${VIRTUAL_ENV}"))${ResetColor} ${PS1}"
    fi

  else
    PS1="${EMPTY_PROMPT}"
  fi
}

function prompt_callback_default {
    return
}

if [ "`type -t prompt_callback`" = 'function' ]; then
    prompt_callback="prompt_callback"
else
    prompt_callback="prompt_callback_default"
fi

if [ -z "$OLD_GITPROMPT" ]; then
  OLD_GITPROMPT=$PS1
fi

if [ -z "$PROMPT_COMMAND" ]; then
  PROMPT_COMMAND=setGitPrompt
else
  PROMPT_COMMAND=${PROMPT_COMMAND%% }; # remove trailing spaces
  PROMPT_COMMAND=${PROMPT_COMMAND%\;}; # remove trailing semi-colon
  PROMPT_COMMAND="$PROMPT_COMMAND;setGitPrompt"
fi