bash_prompt

#!/usr/bin/env bash

if tput setaf 1 &> /dev/null; then
    tput sgr0; # reset colors
    bold="\[$(tput bold)\]";
    italic="\[$(tput sitm)\]";
    reset="\[$(tput sgr0)\]";
    purple="\[$(tput setaf 5)\]"
    black="\[$(tput setaf 0)\]"
    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="\[$(tput setaf 7)\]"
    orange="\[$(tput setaf 166)\]"
    gray="\[$(tput setaf 246)\]"
fi;


_sep="${gray} \[•\] ${reset}"
_dir="${red}\w${reset}"
_host="${italic}${blue}\H${reset}${_sep}";

find_git_branch() {
  # Based on: http://stackoverflow.com/a/13003854/170413
  local branch
  if branch=$(git rev-parse --abbrev-ref HEAD 2> /dev/null); then
    if [[ "$branch" == "HEAD" ]]; then
      branch='detached*'
    fi
    echo "${green}(${branch})${reset} "
  else
    echo ""
  fi
}

find_git_dirty() {
  local status=$(git status --porcelain 2> /dev/null)
  if [[ "$status" != "" ]]; then
    echo '*'
  else
    echo ''
  fi
}

# Determine active Python virtualenv details.
find_virtualenv() {
    if test -z "$VIRTUAL_ENV" ; then
        echo ""
    else
        echo "$cyan[`basename \"$VIRTUAL_ENV\"`] "
    fi
}

# Highlight the user name when logged in as root.
USER=$(whoami)
if [[ "$USER" == "root" ]]; then
    user="${italic}${bold}$red\u${reset}${_sep}";
else
    user="$yellow\u${reset}${_sep}";
fi;

prompt_command() {
    ret_code=$?
    # Are we running in a shell invoked from Vim?
    if [[ "$VIM" ]]; then
        vim="${red}(Vim)${reset} "
    else
        vim=""
    fi

    # Did last command return non-zero value?
    if [ "${ret_code}" != 0 ]; then
        ret_str="${red}❯❯${reset} "
    else
        ret_str="${green}❯${reset} "
    fi

    PS1="\n${user}${_host}${_dir}\n${vim}$(find_virtualenv)$(find_git_branch)${ret_str}"
}

HISTSIZE=9000
HISTFILESIZE=$HISTSIZE

_bash_history_sync() {
    builtin history -a         #1
    HISTFILESIZE=$HISTSIZE     #2
    #builtin history -c         #3
    #builtin history -r         #4
}

history() {                  #5
    _bash_history_sync
    builtin history "$@"
}

export PROMPT_COMMAND="prompt_command; _bash_history_sync"
export PS2="${blue}.... ${reset}"