#!/bin/bash

proc die {
	echo "ERROR: $ifsjoin(Argv)" > /dev/stderr
	patch -p0 make.conf.example < make.conf.example.diff
	exit 1
}

if [[ ! -f make.conf.example || ! -f make.conf.example.x86.diff || ! -d ../.git ]] {
	echo "ERROR: current directory is invalid" > /dev/stderr
	exit 1
}

git diff --no-prefix --relative="$[basename $[pwd]]" make.conf.example > make.conf.example.diff
git checkout -- make.conf.example

setglobal archs = ''()
for x in [make.conf.example.*.diff] {
	setglobal archs = '('"$(basename ${x:18} .diff)")
}


for arch in [$(archs[@])] {
	echo "* Patching $(arch)"
	cp make.conf.example make.conf.example.$(arch) || die "copy failed"
	patch -p0 make.conf.example.$(arch) < make.conf.example.$(arch).diff > /dev/null || die "arch-patch failed"
	patch -p0 make.conf.example.$(arch) < make.conf.example.diff > /dev/null || die "patch failed"
}

echo "* Re-patching make.conf.example"
patch -p0 make.conf.example < make.conf.example.diff > /dev/null || die "repatch failed"

for arch in [$(archs[@])] {
	echo "* Creating diff for $(arch)"
	diff -u make.conf.example make.conf.example.$(arch) > make.conf.example.$(arch).diff
	[[ -z ${KEEP_ARCH_MAKE_CONF_EXAMPLE} ]] && rm -f make.conf.example.$(arch) make.conf.example.$(arch).orig
}

rm make.conf.example.diff

echo "Done"