Git Prompt

.profile

# original git prompt from ray
#     http://raysohn.com/posts/simple-git-prompt.html
# Fix wrapping behavior (escape non-printing characters)
#     http://www.tldp.org/HOWTO/Bash-Prompt-HOWTO/nonprintingchars.html
# Output escaped non-printing characters from a function
#     http://stackoverflow.com/a/13997892/490592
# Maintain new tab behavior in Terminal.app
#     http://superuser.com/a/623305/75328

simple_git_prompt () {

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

    if [ -n "$branch" ]
    then
        local red="\[\033[31m\]"
        local green="\[\033[32m\]"
        local reset="\[\033[0m\]"

        if [ -n "$(git status -z 2> /dev/null)" ]
        then
            git_info="(${red}✘${reset} $branch) "   # dirty index
        else
            git_info="(${green}✔${reset} $branch) " # clean index
        fi
    fi

    PS1="\u@\h \W $git_info\$ "
}
PROMPT_COMMAND="simple_git_prompt; $PROMPT_COMMAND"