bash prompt

[mcepl]

Is your feature request related to a problem? Please describe.
When using osc as a VCS I would like to have a similar prompt indicating the status of my checkout as I have for git. With fish shell it was a trivial to add a function:

function fish_osc_prompt
    [ -d .git ] && return
    set -l osc_binary (type -p osc)
    if [ -n "$osc_binary" -a -x "$osc_binary" -a -f .osc/_package ]
        set -l osc_str (osc status 2>/dev/null |cut -d' ' -f 1|sort|uniq -c|tr -d ' \n')
        # if [ -n "$osc_str" ]
            printf ' (%s)' $osc_str
        # end
    end
end

but I don’t know how to do it with osc.

Describe the solution you'd like
Similar short snippet I would source in ~/.bashrc.

[mcepl]

Hmm, this could work:

#!/bin/bash

__osc_prompt() {
    # Git has a precedence
    if [ -d .git ] ; then
        # Test for the existence of bash function
        declare -F __git_ps1 >/dev/null && printf "%s" "$(__git_ps1 "$@")"
        return
    fi
    # Are we even in the OSC checkout?
    [ -d .osc ] || return

    local osc_binary osc_pattern osc_str; 
    osc_binary=$(type -p osc)
    if [ -n "$1" ] ; then osc_pattern="${*}" ; else osc_pattern="(%s)" ; fi
    if [ -n "$osc_binary" ] && [ -x "$osc_binary" ] && [ -f .osc/_package ] ; then
        osc_str="$(osc status 2>/dev/null |cut -d' ' -f 1|sort|uniq -c|tr -d ' \n')"
        # shellcheck disable=SC2059
        printf " ${osc_pattern}" $osc_str
    fi
}

What do you think?

[dmach]

Sorry it took me so long to look into this.
It seems to be working somehow, but I'd prefer to make it faster (it adds about 1s delay before printing a new prompt line). It probably requires some work on my end to provide desired functionality from osc and do it sufficiently fast.