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@mbarkhau
Created February 6, 2019 18:06
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.bash_prompt
#!/bin/bash
#
# DESCRIPTION:
#
# Set the bash prompt according to:
# * the active virtualenv
# * the branch of the current git/mercurial 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="\[\033[0;31m\]"
YELLOW="\[\033[1;33m\]"
GREEN="\[\033[0;32m\]"
BLUE="\[\033[1;34m\]"
PURPLE="\[\033[0;35m\]"
LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
WHITE="\[\033[1;37m\]"
LIGHT_GRAY="\[\033[0;37m\]"
COLOR_NONE="\[\e[0m\]"
# determine git branch name
function parse_git_branch(){
git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}
# determine mercurial branch name
function parse_hg_branch(){
hg branch 2> /dev/null | awk '{print " (" $1 ")"}'
}
# Determine the branch/state information for this git repository.
function set_git_branch() {
# Get the name of the branch.
branch=$(parse_git_branch)
# if not git then maybe mercurial
if [ "$branch" == "" ]
then
branch=$(parse_hg_branch)
fi
# Set the final branch string.
BRANCH="${PURPLE}${branch}${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 "$VIRTUAL_ENV" ; then
PYTHON_VIRTUALENV=""
else
PYTHON_VIRTUALENV="${BLUE}[`basename \"$VIRTUAL_ENV\"`]${COLOR_NONE} "
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.
set_git_branch
# Set the bash prompt variable.
PS1="
${PYTHON_VIRTUALENV}${GREEN}\u@\h${COLOR_NONE}:${YELLOW}\w${COLOR_NONE}${BRANCH}${CONDA_PROMPT_MODIFIER}
${PROMPT_SYMBOL} "
}
# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt
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