#!/bin/bash
 
if [ $# -ne 2 ] ; then
    echo "Usage:"
    echo "   $0 <git-dir> <base-tag>"
    exit 1
fi
 
git_dir="$1"
base_tag="$2"
 
target_dir="$(pwd)"
 
pushd "$git_dir" >/dev/null
git format-patch -k -o "$target_dir" "$base_tag" >/dev/null
popd >/dev/null
 
echo "# Patches exported from source git"
 
i=1
for p in *.patch ; do
    printf "# "
    sed '/^Subject:/{s/^Subject: //;p};d' "$p"
    printf "Patch%s: %s\n" $i "$p"
    i=$(($i + 1))
done