Subject: Re: [StGIT PATCH] Bash snippet to show branch and patch in bash prompt

From: Eran Tromer <[email-masked]>
Date: Mon, 30 Oct 2006 11:57:03 +0200

On 2006-10-30 01:37, Robin Rosenberg wrote:
> +# include this in your bashrc or copy to /etc/bash_completions.d
> +
> +if [ "$PS1" ]; then
> +    # trap 'PS1="\u@\h [$(stg top)] \w]\$ "' DEBUG
> +    function stgtag
> +    {
> +	br=$(stg branch 2>/dev/null)
> +	top=$(stg top 2>/dev/null)
> +	if [[ -n "$br$top" ]];then
> +	    echo "[$top@$br]"
> +	    return
> +	fi
> +    }
> +    PS1='\u@\h$(stgtag)\w\$ '
> +
> +fi

That's an annoying 430ms delay at every prompt, on my box. Does StGIT do
something expensive on every invocation?

Ben Clifford'd solution is pretty much instantaneous, and the following
extends it to StGIT (in a less clean but much faster way):

----------------------------------------------
__prompt_githead() {
    __PS_GIT="$(git-symbolic-ref HEAD 2>/dev/null)" || exit
    __PS_GIT="$(basename $__PS_GIT)"
    echo -n " $__PS_GIT"
    __PS_GIT=$(cat "${GIT_DIR:-.git}/patches/$__PS_GIT/current" \
               2>/dev/null) || exit
    echo -n ":$__PS_GIT"
}
PS1='[\u@\h \W$(__prompt_githead)]\$ '
----------------------------------------------