package-addon.sh

#!/bin/sh
#
# This relies on addons specifying the external dependencies in their toc file.
# Blizzard conveniently ignores everything after the first space in the
# OptionalDependency field so we can use something like this:
#
#   ## OptionalDependency: FooLibrary git@github.com:you/FooLibrary.git deadbeef:Lib/
#
# Where deadbeef:Lib/ is the tree-ish we want to extract and put into Libs/FooLibrary.
#

# git-archive which works even if the remote doens't support git-upload-archive.
archive () {
	GITDIR="$(mktemp -d $TMPDIR/XXXXXXX)"
	git clone --bare --quiet "$2" "$GITDIR"
	git --git-dir "$GITDIR" archive --prefix="$1/" "$3" | tar -xf -

	RET="$(git --git-dir "$GITDIR" describe --always)"
	rm -rf "$GITDIR"

	echo "$RET"
}

# Create a temporary directory where we'll build the package.
ROOT="$(mktemp -d $TMPDIR/XXXXXXX)"
pushd "$ROOT"

# The source of the addon goes into a subdirectory so that when the user
# extracts the package into the AddOns directory it'll just work.
NAME="$(archive "$1" "$2" "$3")"
pushd "$1"

# Extract all optional dependencies into Libs/
cat "$1.toc" | sed -n -e '/^## OptionalDeps/ { s/## OptionalDeps: //; p; }' | \
	while read name source treeish; do
		archive "Libs/$name" "$source" "$treeish"
done

# Go back to the directory where we started in
popd
popd

# Create the package and clean up
tar -cvC "$ROOT" . | xz > "$NAME.tar.xz"
rm -rf "$ROOT"