Git colored prompt

.bashrc

# This is a fork of a fork of a fork... of probably https://www.marc-eymard.fr/linux/bash-prompt
# Add the following lines inside your ~/.bashrc

# START : git, coloration

if [ -z "$PS1_ORIG" ]; then
        PS1_ORIG=$PS1
        OLD_PROMPT_COMMAND=$PROMPT_COMMAND
fi

RED='\001\033[31m\002'
YELLOW='\001\033[33m\002'
GREEN='\001\033[32m\002'
BLUE='\001\033[34m\002'
DARK_BLUE='\001\033[36m\002'
COLOR_NONE='\001\033[00m\002'

function parse_git_branch {
        local AHEAD='↑'
        local LATE='↓'
        local DIVERGE='↕'
        local NOT_CLEAN='!'

        git rev-parse --git-dir &> /dev/null

        if [ $? != 0 ]; then
                echo "NOT_A_GIT_REPO"
        else
                git_status="$(git status 2> /dev/null)"
                branch_pattern="^# On branch ([^${IFS}]*)"
                remote_pattern="# Your branch is (.*)"
                diverge_pattern="# Your branch and (.*) have diverged"

                if [[ ! ${git_status} =~ "working tree clean" ]]; then
                        state="${RED}${NOT_CLEAN}"
                fi

                # add an else if or two here if you want to get more specific
                if [[ ${git_status} =~ ${remote_pattern} ]]; then
                        if [[ ${BASH_REMATCH[1]} =~ "ahead of" ]]; then
                                remote="${YELLOW}${AHEAD}"
                        else
                                remote="${YELLOW}${LATE}"
                        fi
                fi

                if [[ ${git_status} =~ ${diverge_pattern} ]]; then
                        remote="${YELLOW}${DIVERGE}"
                fi

		branch=$(git rev-parse --abbrev-ref HEAD 2> /dev/null)

		echo " (${branch})${remote}${state}"
        fi
}

function prompt_func() {
        previous_return_value=$?;
        local git_result=$(parse_git_branch)

        if [ "$git_result" == "NOT_A_GIT_REPO" ]; then
                eval ${OLD_PROMPT_COMMAND}
                PS1=$PS1_ORIG
        else
                local GIT_TOPLEVEL=$(git rev-parse --show-toplevel)
                local prompt="${BLUE}[${RED}${PWD/#${GIT_TOPLEVEL%/*}/}${GREEN}${git_result}${BLUE}]${COLOR_NONE}"
                local SEP="➔"

                eval ${OLD_PROMPT_COMMAND} #Set the title value

                if test $previous_return_value -eq 0; then
                        PS1="${prompt}${SEP}${COLOR_NONE} "
                else
                        PS1="${prompt}${RED}${SEP}${COLOR_NONE} "
                fi
        fi
}

PROMPT_COMMAND=prompt_func

# END : git, coloration