This .gitrc activates when you're in a directory that is a git repo. It tells you the branch you're on, with color handling of the bash prompt according to the branch/status. For example, the prompt would look like this: [~/foo](master) $ with (master) colored GREEN, until you've added a file to the repo, but not committed it, then it will turn …

gitrc

#!/bin/bash
#
# Set your bash prompt according to the branch/status of the current git repository.
# Relies on git output being in English.
# Set an alias with
#    $ echo "alias git='LANGUAGE=en_US.UTF-8 git'" >> ~/.bash_profile
#
# Forked from https://gist.github.com/philcryer/5066010
#
RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
GREEN="\[\033[0;32m\]"
BLUE="\[\033[0;34m\]"
LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
WHITE="\[\033[1;37m\]"
LIGHT_GRAY="\[\033[0;37m\]"
COLOR_NONE="\[\e[0m\]"

function is_git_repository {
    git branch > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        true
    else
        false
    fi
}

function parse_git_branch {
    # Only display git info if we're inside a git repository.
    if ! is_git_repository ; then
        return 1
    fi

    # Capture the output of the "git status" command.
    git_status="$(git status 2> /dev/null)"

    # Set color based on clean/staged/dirty.
    if [[ ${git_status} =~ "working tree clean" ]]; then
        state="${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 (ahead|behind)"
    if [[ ${git_status} =~ ${remote_pattern} ]]; then
        if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
            remote="↑"
        else
            remote="↓"
        fi
    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

    # Detached
    detached_pattern="^HEAD detached at ([^${IFS}]*)"
    if [[ ${git_status} =~ ${detached_pattern} ]]; then
        branch="HEAD detached ${BASH_REMATCH[1]}"
    fi

    # Display the prompt.
    echo "${state}(${branch})${remote}${COLOR_NONE} "
}

function prompt_symbol {
    echo "\$"
}

function prompt_func {
    last_return_value=$?
    PS1="[\w]$(parse_git_branch)$(prompt_symbol $last_return_value) "
}

PROMPT_COMMAND=prompt_func