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#!/bin/bash
#
# DESCRIPTION:
#
# Set the bash prompt according to:
# * the branch/status of the current git repository
# * the branch of the current subversion repository
# * the return value of the previous command
#
# USAGE:
#
# 1. Save this file as ~/.git_svn_bash_prompt
# 2. Add the following line to the end of your ~/.profile or ~/.bash_profile:
# . ~/.git_svn_bash_prompt
#
# AUTHOR:
#
# Tim Sweet based on original work by:
# Scott Woods <scott@westarete.com>
# West Arete Computing
#
# Based on work by halbtuerke and lakiolen.
#
# http://gist.github.com/31967
# The various escape codes that we can use to color our prompt.
RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
CYAN="\[\033[0;36m\]"
BLUE="\[\033[0;34m\]"
GREEN="\[\033[0;32m\]"
DEFAULT="\[\e[0m\]"
# Detect whether the current directory is a git repository.
function is_git_repository {
git branch > /dev/null 2>&1
}
# Detect whether the current directory is a subversion repository.
function is_svn_repository {
test -d .svn
}
# 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 [[ ${git_status} =~ "Untracked files" ]]; then
remote=""
state="${RED}"
elif [[ ${git_status} =~ "Changes to be committed" ]]; then
remote=""
state="${YELLOW}"
# Set arrow icon based on status against remote.
elif [[ ${git_status} =~ "Your branch is ahead" ]]; then
remote=""
state="${GREEN}"
elif [[ ${git_status} =~ "Your branch is behind" ]]; then
remote=""
state="${RED}"
elif [[ ${git_status} =~ "Your branch and (.*) have diverged" ]]; then
remote=""
state="${YELLOW}"
else
remote=""
state="${CYAN}"
fi
# Get the name of the branch.
branch_pattern="^# On branch ([^${IFS}]*)"
if [[ ${git_status} =~ ${branch_pattern} ]]; then
branch=${BASH_REMATCH[1]}
fi
# Set the final branch string.
BRANCH="${state}(${branch})${remote}${DEFAULT} "
}
# Determine the branch information for this subversion repository. No support
# for svn status, since that needs to hit the remote repository.
function set_svn_branch {
# Capture the output of the "git status" command.
svn_info="$(svn info | egrep '^URL: ' 2> /dev/null)"
# Get the name of the branch.
branch_pattern="^URL: .*/(branches|tags)/([^/]+)"
trunk_pattern="^URL: .*/trunk(/.*)?$"
if [[ ${svn_info} =~ $branch_pattern ]]; then
branch=${BASH_REMATCH[2]}
elif [[ ${svn_info} =~ $trunk_pattern ]]; then
branch='trunk'
fi
# Set the final branch string.
BRANCH="(${branch}) "
}
# Return the prompt symbol to use, colorized based on the return value of the
# previous command.
function set_prompt_symbol () {
if test $1 -eq 0 ; then
PROMPT_SYMBOL="\$"
else
PROMPT_SYMBOL="${RED}\$${DEFAULT}"
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 BRANCH variable.
if is_git_repository ; then
set_git_branch
elif is_svn_repository ; then
set_svn_branch
else
BRANCH=''
fi
# Set the bash prompt variable.
PS1="[ \[\033[0;35m\]\u@\h \[\033[0;34m\]\w ${BRANCH}\[\033[0m\]] \n\[\033[0;34m\]\$\[\033[0m\] "
}
# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt
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