#!/bin/bash

pkgconfig=/usr/bin/pkg-config
test -x $pkgconfig || {
    cat > /dev/null
    exit 0
}

[ $# -ge 1 ] || {
    cat > /dev/null
    exit 0
}

case $1 in
-P|--provides)
    while read filename ; do
    case "${filename}" in
    *.pc)
	# Assume that this file doesn't contain useful information.
	if [[ "$(dirname ${filename})" =~ pkgconfig ]]; then
	    pcfiles=${pcfiles}" ${filename}"
	    PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$(dirname ${filename})
	fi
	;;
    esac
    done
        if [ -n "$pcfiles" ]
	then
	    # Query the dependencies of the package.
	    PKG_CONFIG_PATH=$PKG_CONFIG_PATH $pkgconfig --print-errors --print-provides $pcfiles | while read n r v ; do
		# We have a dependency.  Make a note that we need the pkgconfig
		# tool for this package.
		test -z "$v" && test -n "$r" && echo "Error with pkgconfig($n)" >&2 && exit 1
		echo "pkgconfig($n)" "$r" "$v"
	    done
	    test ${PIPESTATUS[0]} -ne 0 && echo "$pkgconfig returned an error" >&2 && exit 1
	    # The dependency on the pkgconfig package itself.
	fi
    ;;
-R|--requires)
    while read filename ; do
    case "${filename}" in
    *.pc)
	if [[ "$(dirname ${filename})" =~ pkgconfig ]]; then
	    pcfiles=${pcfiles}" ${filename}"
	    PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$(dirname ${filename})
	fi
    esac
    done
    if [ -n "$pcfiles" ]
    then
	PKG_CONFIG_PATH=$PKG_CONFIG_PATH $pkgconfig --print-errors --print-requires ${pcfiles} | while read n r v ; do
		test -z "$v" && test -n "$r" && echo "Error with pkgconfig($n)" >&2 && exit 1
		echo "pkgconfig($n)" "$r" "$v"
	done
	test ${PIPESTATUS[0]} -ne 0 && echo "$pkgconfig returned an error" >&2 && exit 1
    fi
    ;;
esac
exit 0