Show git branch info in PS1

.bashrc_git_ps1

# ~/.bashrc_git_ps1
# echo . ~/.bashrc_git_ps1 >> ~/.bashrc
# 
# show git branch and time since last commit with color
# see: https://ihower.tw/blog/archives/5436

function git_branch {
    ref=$(git symbolic-ref HEAD 2> /dev/null) || return;
    echo "("${ref#refs/heads/}") ";
}

function git_since_last_commit {
    now=`date +%s`;
    last_commit=$(git log --pretty=format:%at -1 2> /dev/null) || return;
    seconds_since_last_commit=$((now-last_commit));
    minutes_since_last_commit=$((seconds_since_last_commit/60));
    hours_since_last_commit=$((minutes_since_last_commit/60));
    minutes_since_last_commit=$((minutes_since_last_commit%60));

    echo "${hours_since_last_commit}h${minutes_since_last_commit}m ";
}

PS1="\[\033[38;5;11m\]\u\[$(tput sgr0)\]@\h:[\[\033[1;32m\]\w\[\033[0m\]] \[\033[0m\]\[\033[1;36m\]\$(git_branch)\[\033[0;33m\]\$(git_since_last_commit)\[\033[0m\]$ "