#!/bin/bash

usage() {
	cat <<- EOF
	usage: tools/dep-tree [variant] [variant]
	If no parameter is given the selected-variant is used.
	Possible variants: node layer3
	To display the tree pipe it to dot:
	tools/dep-tree | dot -Tx11
	EOF
}

builddir=./build
variant=$(cat selected_variant)
[ $# = 0 ] || variant="$@"
feeds=$builddir/feeds
feed=fff

tmpfile=$(mktemp)

write_deps() {
	local deps
	local dep
	local pkg=$1
	deps=$(awk -v RS="@@" "/Package: $pkg\\n/ { print }" "${feeds}/${feed}".index | grep ^Depends: | sed 's/Depends: //' | tr -d +)
	for dep in $deps; do
		echo "\"$pkg\" -> \"$dep\"" >> "$tmpfile"
	done
	for dep in $deps; do
		grep "Package:" "${feeds}/${feed}.index" | grep " $dep$" &> /dev/null && write_deps "$dep"
	done
}

for v in base $variant; do
	defaults="$defaults fff-$v"
done
# start tree
for package in $defaults; do
	write_deps "$package"
done

# write the gv file to stdout
echo "digraph G {"
sort "$tmpfile" | uniq | grep -v libc | grep -v libssp | grep -v libpthread | grep -v librt
echo "}"
[ -s $tmpfile ] || usage
rm "$tmpfile"


# vim: ts=4