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Set color bash prompt according to git/svn branch, and return status of last command.
#!/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:
#
# 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.
# Reset
Color_Off="\[\033[0m\]" # Text Reset
# Regular Colors
Black="\[\033[0;30m\]" # Black
Red="\[\033[0;31m\]" # Red
Green="\[\033[0;32m\]" # Green
Yellow="\[\033[0;33m\]" # Yellow
Blue="\[\033[0;34m\]" # Blue
Purple="\[\033[0;35m\]" # Purple
Cyan="\[\033[0;36m\]" # Cyan
White="\[\033[0;37m\]" # White
# Bold
BBlack="\[\033[1;30m\]" # Black
BRed="\[\033[1;31m\]" # Red
BGreen="\[\033[1;32m\]" # Green
BYellow="\[\033[1;33m\]" # Yellow
BBlue="\[\033[1;34m\]" # Blue
BPurple="\[\033[1;35m\]" # Purple
BCyan="\[\033[1;36m\]" # Cyan
BWhite="\[\033[1;37m\]" # White
# Underline
UBlack="\[\033[4;30m\]" # Black
URed="\[\033[4;31m\]" # Red
UGreen="\[\033[4;32m\]" # Green
UYellow="\[\033[4;33m\]" # Yellow
UBlue="\[\033[4;34m\]" # Blue
UPurple="\[\033[4;35m\]" # Purple
UCyan="\[\033[4;36m\]" # Cyan
UWhite="\[\033[4;37m\]" # White
# Background
On_Black="\[\033[40m\]" # Black
On_Red="\[\033[41m\]" # Red
On_Green="\[\033[42m\]" # Green
On_Yellow="\[\033[43m\]" # Yellow
On_Blue="\[\033[44m\]" # Blue
On_Purple="\[\033[45m\]" # Purple
On_Cyan="\[\033[46m\]" # Cyan
On_White="\[\033[47m\]" # White
# High Intensty
IBlack="\[\033[0;90m\]" # Black
IRed="\[\033[0;91m\]" # Red
IGreen="\[\033[0;92m\]" # Green
IYellow="\[\033[0;93m\]" # Yellow
IBlue="\[\033[0;94m\]" # Blue
IPurple="\[\033[0;95m\]" # Purple
ICyan="\[\033[0;96m\]" # Cyan
IWhite="\[\033[0;97m\]" # White
# Bold High Intensty
BIBlack="\[\033[1;90m\]" # Black
BIRed="\[\033[1;91m\]" # Red
BIGreen="\[\033[1;92m\]" # Green
BIYellow="\[\033[1;93m\]" # Yellow
BIBlue="\[\033[1;94m\]" # Blue
BIPurple="\[\033[1;95m\]" # Purple
BICyan="\[\033[1;96m\]" # Cyan
BIWhite="\[\033[1;97m\]" # White
# High Intensty backgrounds
On_IBlack="\[\033[0;100m\]" # Black
On_IRed="\[\033[0;101m\]" # Red
On_IGreen="\[\033[0;102m\]" # Green
On_IYellow="\[\033[0;103m\]" # Yellow
On_IBlue="\[\033[0;104m\]" # Blue
On_IPurple="\[\033[10;95m\]" # Purple
On_ICyan="\[\033[0;106m\]" # Cyan
On_IWhite="\[\033[0;107m\]" # White
# Various variables you might want for your PS1 prompt instead
Time12h="\t"
Time12a="\@"
PathShort="\w"
PathFull="\W"
NewLine="\n"
Jobs="\j"
# 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 [[ ${git_status} =~ "working directory clean" ]]; then
state="${Green}"
elif [[ ${git_status} =~ "Changes to be committed" ]]; then
state="${Yellow}"
else
state="${Red}"
fi
# Set arrow icon based on status against remote.
remote_pattern="# Your branch is (.*) of"
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} =~ ${diverge_pattern} ]]; then
remote=""
fi
# Get the name of the branch.
branch_pattern="^# On branch ([^${IFS}]*)"
if [[ ${git_status} =~ ${branch_pattern} ]]; then
branch=${BASH_REMATCH[1]}
fi
# Set the final branch string.
BRANCH="${state}(${branch})${remote}${Color_Off} "
}
# 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}\$${Color_Off}"
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="\u@\h \w ${BRANCH}${PROMPT_SYMBOL} "
}
# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt
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