mah_prompt.sh

################################################################################
# terminal/prompt stuff
################################################################################
BLUE="\[\033[0;34m\]"
CYAN="\[\033[0;36m\]"
GREEN="\[\033[0;32m\]"
RED="\[\033[0;31m\]"
MAGENTA="\[\033[0;35m\]"
YELLOW="\[\033[0;33m\]"
WHITE="\[\033[1;37m\]"
ENDCOLOR="\[\033[0m\]"

# Colored ls output
export CLICOLOR=1
export LSCOLORS=dxfxcxdxbxegedabagacad
# export TERM="xterm-color"

# Turn off the bell
# xset b 0

COLOR1=$CYAN
COLOR2=$GREEN
COLOR3=$CYAN
COLOR4=$RED

if [ $UID = 0 ]; then
  # I am root
  COLOR2=$RED
fi

parse_git_branch() {
  git rev-parse --git-dir &> /dev/null
  git_status="$(git status 2> /dev/null)"
  branch_pattern="^On branch ([^${IFS}]*)"
  remote_pattern="^Your branch is ([[:alnum:]]*)"
  diverge_pattern="^Your branch and (.*) have diverged"

  if [[ ${git_status} =~ ${branch_pattern} ]]; then
    branch=${BASH_REMATCH[1]}
    if [[ ${git_status} =~ "Changes to be committed" ]]; then
      state="${state}${GREEN}S"
    fi
    if [[ ${git_status} =~ "Changes not staged for commit" ]]; then
      state="${state}${YELLOW}C"
    fi
    if [[ ${git_status} =~ "Untracked files" ]]; then
      state="${state}${CYAN}U"
    fi

    # add an else if or two here if you want to get more specific
    if [[ ${git_status} =~ ${remote_pattern} ]]; then
      if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
        remote="${YELLOW}↑"
      else
        remote="${YELLOW}↓"
      fi
    fi
    if [[ ${git_status} =~ ${diverge_pattern} ]]; then
      remote="${YELLOW}↕"
    fi

    if [[ -n ${state} ]]; then
      state=" ${state}"
    fi
    echo -e " $GREEN[${YELLOW}${branch}${remote}${state}${GREEN}]"
  fi
}

parse_rvm_gemset() {
  if [[ -f ./Gemfile ]]; then
    GEMSET=$(basename "$GEM_HOME")
    echo -e " $GREEN[${RED}${GEMSET}${GREEN}]"
  fi
}

prompt_func() {
  nametab $(basename $(pwd))
  export PS1="$COLOR2($COLOR3\u@$RED\h$COLOR2::$(date '+%Y-%m-%d %H:%M')) $COLOR2($COLOR3\w$COLOR2)$(parse_git_branch)$(parse_rvm_gemset)\n$COLOR1\$$ENDCOLOR "
}
alias prompt_func=prompt_func
export PROMPT_COMMAND="history -a; history -c; history -r; prompt_func"