#!/bin/bash

PS1="$"
basedir=`pwd`
echo "Rebuilding patch files from current fork state..."

function cleanupPatches {
    cd "$1"
    for patch in *.patch; do
        gitver=$(tail -n 2 $patch | grep -ve "^$" | tail -n 1)
        diffs=$(git diff --staged $patch | grep -E "^(\+|\-)" | grep -Ev "(From [a-z0-9]{32,}|\-\-\- a|\+\+\+ b|.index)")

        testver=$(echo "$diffs" | tail -n 2 | grep -ve "^$" | tail -n 1 | grep "$gitver")
        if [ "x$testver" != "x" ]; then
            mingw=$(uname -s | grep "MINGW")
            if [ "x$mingw" != "x" ]; then
                diffs=$(echo "$diffs" | head -n $(($(echo "$diffs" | wc -l | sed -r 's/^ +//' | cut -d ' ' -f 1) - 2)))
            else
                diffs=$(echo "$diffs" | head -n -2)
            fi
        fi
        

        if [ "x$diffs" == "x" ] ; then
            git reset HEAD $patch >/dev/null
            git checkout -- $patch >/dev/null
        fi
    done
}

function savePatches {
    what=$1
    target=$2
    cd "$basedir/$target"
    git format-patch --no-stat -N -o "$basedir/${what}-Patches/" upstream/upstream
    cd "$basedir"
    git add "$basedir/${what}-Patches"
    cleanupPatches "$basedir/${what}-Patches"
    echo "  Patches saved for $what to $what-Patches/"
}

#savePatches Bukkit Spigot-API
#savePatches CraftBukkit Spigot-Server
savePatches Spigot-API PaperSpigot-API
savePatches Spigot-Server PaperSpigot-Server