bash settings with virtualenv

.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="\[\033[0;31m\]"
    GYELLOW="\[\e[93m\]"
    LYELLOW="\[\e[1;33m\]"
      GREEN="\[\033[0;32m\]"
       BLUE="\[\033[1;34m\]"
  LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
      WHITE="\[\033[1;37m\]"
 LIGHT_GRAY="\[\033[0;37m\]"
 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_GRAY}"
  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=" ${state}git:[${branch}]${remote}${COLOR_NONE} "
}

# Return the prompt symbol to use, colorized based on the return value of the
# previous command.
function set_prompt_symbol () {
        PROMPT_SYMBOL="\[\e[37;1m\]";
        PROMPT_SYMBOL+="\u@ ";
        PROMPT_SYMBOL+="\[\e[36;1m\]";
        PROMPT_SYMBOL+="\W";
        PROMPT_SYMBOL+="\[\e[31m\]";
        PROMPT_SYMBOL+="\$ ";
        PROMPT_SYMBOL+="\[\e[0m\]";
}

# Determine active Python virtualenv details.
function set_virtualenv () {
  if [[ `pyenv version-name` == "system" ]] ; then
      PYTHON_VIRTUALENV=""
  else 
  VENVNAME="$(pyenv version-name)"
  COLOR="$LYELLOW"
    if [ "$(pyenv global)" != "$(pyenv version-name)" ] ; then
        PYTHON_VIRTUALENV="${COLOR}pyenv:[`pyenv version-name`]${COLOR_NONE}"
        pyenvFLAG="1"
    else
        pyenvFLAG="0"
    fi
  fi
}

# 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
    set_git_branch
    gitFLAG="1"
  else
    BRANCH=''
    gitFLAG="0"
  fi

  # Set the bash prompt variable.
  FLAG="1"
  [ "$gitFLAG" == "$pyenvFLAG" ] && [ "$gitFLAG" ==  "0" ] && FLAG="0"
  if [ "$FLAG" == "1"  ] ; then
  PS1="${PYTHON_VIRTUALENV}${BRANCH}
${PROMPT_SYMBOL}"
  else if [ "$FLAG" == "0" ] ; then
   PS1="${PROMPT_SYMBOL}"
   fi
  fi
}

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