#!/bin/bash

# Target Branch
# Defaults to HEAD
giturltarget=${1:-HEAD}
giturlreference="the current branch"
if [ "$giturltarget" != "HEAD" ]; then
    giturlreference=$giturltarget
fi

# Current rev:
giturlcurrev=`git rev-list --max-count=1 $giturltarget`
# Find all remote branches that have the current rev as their tip
for giturlremote in `git remote`
do
    giturlhasrev=`git ls-remote $giturlremote | grep "$giturlcurrev.*refs/heads/" | sed 's|.*refs/heads/||'`
    if [ "$giturlhasrev" ]; then
        echo "For sharing $giturlreference via the remote repo $giturlremote:"
        echo ""
        giturlremoteurl=`git config -l | grep ${giturlremote}.url | cut -f2 -d= | sed 's/\\([^@]*@\\|[^:]*:\\/\\/\\)\\([^:\\/]*\\)[:\\/]\\(.*\\)/\\2:\\3/'`
        if [ "$giturlremote" == "origin" ]; then
            giturlremote=remote_name
            echo "Change remote_name as appropriate in the below commands."
            echo ""
        fi
        echo "You need only add the remote once, regardless of how many branches you wish to look at."
        echo "To add this repo as $giturlremote:"
        echo " Read-only (git protocol):"
        echo "  git remote add $giturlremote git://`echo $giturlremoteurl | sed 's/:/\\//'`"
        echo " Read-write (ssh protocol):"
        echo "  git remote add $giturlremote git@$giturlremoteurl"
        echo ""
        echo "Once you have the remote added you can check out this branch:"
        giturlshowor=
        for giturlbranch in $giturlhasrev
        do
            if [ "$giturlshowor" ]; then
                echo "or"
            fi
            giturlshortbranch=`echo $giturlbranch | sed 's|.*/||'`
            echo "git checkout -b $giturlshortbranch $giturlremote/$giturlbranch"
            giturlshowor=yes
        done
        echo ""
    fi
done