.bash_prompt

#!/bin/bash
#
# DESCRIPTION:
#
#   Set the bash prompt according to:
#    * the active virtualenv
#    * the branch/status of the current git repository
#    * the return value of the previous command
#    * the fact you just came from Windows and are used to having newlines in
#      your prompts.
#
# USAGE:
#
#   1. Save this file as ~/.bash_prompt
#   2. Add the following line to the end of your ~/.bashrc or ~/.bash_profile:
#        . ~/.bash_prompt
#
# LINEAGE:
#
#   Based on work by woods
#
#   https://gist.github.com/31967

# The various escape codes that we can use to color our prompt.
         RED="\[\033[0;31m\]"
        AQUA="\[\033[5;49;36m\]"
      YELLOW="\[\033[0;33m\]"
       GREEN="\[\033[0;32m\]"
        BLUE="\[\033[0;34m\]"
   LIGHT_RED="\[\033[0;31m\]"
LIGHT_PURPLE="\[\033[0;49;95m\]"
 LIGHT_GREEN="\[\033[1;32m\]"
       WHITE="\[\033[4:40;37m\]"
  LIGHT_GRAY="\[\033[2;49;96m\]"
  COLOR_NONE="\[\e[0m\]"

# Detect whether the current directory is a git repository.
function is_git_repository {
  git branch > /dev/null 2>&1
}

# Determine the branch/state information for this git repository.
function set_git_branch {
  # Capture the output of the "git status" command.
  git_status="$(git status 2> /dev/null)"

  # Set color based on clean/staged/dirty.
  if [[ ${git_status} =~ "working directory clean" ]]; then
    state="${GREEN}"
  elif [[ ${git_status} =~ "Changes to be committed" ]]; then
    state="${YELLOW}"
  else
    state="${LIGHT_RED}"
  fi

  # Set arrow icon based on status against remote.
  remote_pattern="# Your branch is (ahead|behind)+ "
  if [[ ${git_status} =~ ${remote_pattern} ]]; then
    if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
      remote="↑"
    else
      remote="↓"
    fi
  else
    remote=""
  fi
  diverge_pattern="# Your branch and (.*) have diverged"
  if [[ ${git_status} =~ ${diverge_pattern} ]]; then
    remote="↕"
  fi

  # Get the name of the branch.
  branch="$(git rev-parse --abbrev-ref HEAD)"

  # Set the final branch string.
  BRANCH="${state}(${branch})${remote}${COLOR_NONE}"
}

# Return the prompt symbol to use, colorized based on the return value of the
# previous command.
function set_prompt_symbol () {
  if test $1 -eq 0 ; then
      PROMPT_SYMBOL="\$"
  else
      PROMPT_SYMBOL="${LIGHT_RED}\$${COLOR_NONE}"
  fi
}

# Determine active Python virtualenv details.
function set_virtualenv () {
  if test -z "$VIRTUAL_ENV" ; then
      PYTHON_VIRTUALENV=""
  else
      PYTHON_VIRTUALENV="${WHITE}[`basename \"$VIRTUAL_ENV\"`]${COLOR_NONE} "
  fi
}

VC_PROMPT=$'\033[5;49;95m%b\033[1;49;97m'
VC_PROMPT_EX="$VC_PROMPT%m%u"
set_vcprompt() {
  path=`pwd`
  vcprompt -f "$VC_PROMPT_EX"
}

# Set the full bash prompt.
function set_bash_prompt () {
  # Set the PROMPT_SYMBOL variable. We do this first so we don't lose the
  # return value of the last command.
  set_prompt_symbol $?

  # Set the PYTHON_VIRTUALENV variable.
  set_virtualenv

  # Set the BRANCH variable.
  if is_git_repository ; then
    BRANCH="${LIGHT_GRAY}on${COLOR_NONE} ($(set_vcprompt)${COLOR_NONE}) "
    #set_git_branch
  else
    BRANCH="${COLOR_NONE}"
  fi

  # temporary
  #VTE_PWD_THING=""
  #if [ $TILIX_ID ] || [ $VTE_VERSION ]; then
  #  VTE_PWD_THING="$(__vte_osc7)"
  #fi
  # Set the bash prompt variable.
  PS1="
\u@${YELLOW}\h ${LIGHT_GRAY}${BRANCH}${AQUA}\w${COLOR_NONE}
${PYTHON_VIRTUALENV}${PROMPT_SYMBOL} "
}

# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt