#!/bin/sh
# xpcdeps pcfile ... - finds package matching the Requires: section of pkg-config files
cleanup() {
	[ -n "$tempdir" ] &&
	[ -d "$tempdir" ] &&
	rm -rf -- "$tempdir"
}
trap cleanup EXIT INT TERM

tempdir="$(mktemp -d)"

# This takes 1 argument which is the name of the file to write to and reads
# lines from stdin in the form of '$pkgname $file'
create_pcfile() {
	branch=$(git symbolic-ref -q --short HEAD 2>/dev/null)
	while read -r pkgname file ; do
		# We search for Requires.private: because even they are required
		# for usage with --cflags
		for rpkg in $( xbps-query --repository=hostdir/binpkgs/"$branch" --cat="$file" "$pkgname" | grep "Requires:\|Requires.private" | cut -d: -f2 | sed 's/,/ /g' ) ; do
			printf "%s\\n" "$rpkg" >> "$tempdir/$1.pc"
		done
	done
}

grab_local() {
	branch=$(git symbolic-ref -q --short HEAD 2>/dev/null)
	for pkg in hostdir/binpkgs/$branch/* ; do
		pkg="${pkg##*/}"
		pcfile="$(xbps-query -i --repository=hostdir/binpkgs/"$branch" -f "${pkg%-*}" | grep "$1.pc")"
		if [ -n "$pcfile" ] ; then
			printf "%s %s\\n" "${pkg%-*}" "$pcfile"
			touch "$tempdir/$1.pc"
		fi
	done | create_pcfile "$1"

	# Check if the file doesn't exist, we can't check if it empty because emptyness
	# means the Requires: is defined but is empty
	[ -f "$tempdir/$1.pc" ] || return 1
}

grab_requires() {
	for pkg; do
		xlocate "usr/\(lib\|share\)/pkgconfig/$pkg.pc" |
		{ grep . || { echo "xpcdeps: No pkg-config file for $pkg found." 1>&2 ; exit 1; } } |
		create_pcfile "$pkg"
	done
}

get_package_from_requires() {
	while read -r pkg ; do
		xlocate "usr/\(lib\|share\)/pkgconfig/$pkg.pc" |
		{ grep . || { printf -- "UNKNOWN PKG PLEASE FIX -> %s\\n" "$pkg" 1>&2 ; return; } } |
		while read -r pkgname file ; do
			file="${file##*/}"
			printf "%s -> %s\\n" "${pkgname%-*}" "${file%*.pc}"
		done
	done
}

sanitize_pcfile() {
	# remove special symbols ( < > = { } $ ) 
	# remove version numbers
	# remove all duplicates
	sed -i -e '/[${<=>}]/d' \
		   -e '/[a-zA-Z]/!d' "$1"
	sort -o "$1" -u "$1"
}

for arg; do
	grab_local "$arg" || \
		grab_requires "$arg" && \
		[ -f "$tempdir/$arg.pc" ] && \
		sanitize_pcfile "$tempdir/$arg.pc" && \
		get_package_from_requires < "$tempdir/$arg.pc"
done