May 26, 2009

Speedy Bash Prompt: Git and Subversion Integration

I had tried using a number of other bash scripts to display git and svn info in the prompt, but things had become pretty sluggish. Sure things would cache after the first time I cd’d into the directory, but often I was stuck waiting while that first try happened. I couldn’t take it any more. I wanted some info still in the prompt, but I didn’t need that much, so I trimmed things down.

scm_ps1() {
    local s=
    if [[ -d ".svn" ]] ; then
        s=\(svn:$(svn info | sed -n -e '/^Revision: \([0-9]*\).*$/s//\1/p' )\)
    else
        s=$(__git_ps1 "(git:%s)")
    fi
    echo -n "$s"
}
export PS1="\[\033[00;32m\]\u\[\033[00;32m\]@\[\033[00;32m\]\h:\[\033[01;34m\]\w \[\033[31m\]\$(scm_ps1)\[\033[00m\]$\[\033[00m\] "

This requires you have the git bash compleation script installed for the __git_ps1 command. Which I have on OS X from MacPorts (if you used the +bash_compleation option) and from Apt on Ubuntu.

You will need to source these in your .bash_login.

For all the bashy compleations:

if [ -f /opt/local/etc/bash_completion ]; then
. /opt/local/etc/bash_completion
fi

Just for git:

if [ -f /opt/local/etc/bash_completion.d/git ]; then
. /opt/local/etc/bash_completion.d/git
fi

If interested check out the home/bash_login script in my dotfiles project.