#!/bin/bash
#
###############################################################################
#
# portage-config: Show any configuration instructions at the end of installed
#                 ebuilds (contained within the pkg_postinst function).
#
# Stuart Shelton, 20040207.
#
# Revision History
# ----------------
# 20040207 SRCS Initial Version
# 20040421 SRCS Make use of functions.sh, use qpkg, general improvements.
# 20040718 SRCS Convert to equery
#
###############################################################################
#
# set -o xtrace

NAME="$( basename ${0} )"
# QPKG="/usr/bin/equery"
# QPKGOPTS="-q -C list -i \*"
QPKG="$( type -p epm )"
QPKGOPTS="-qGa"

[ -d /dev/shm -a -w /dev/shm ] && TMP="/dev/shm"

# VERBOSE=1

function die() {
        exit ${1:-1}
}

function error() {
        warn "$@"
        die 1
}

function warn() {
	echo -e "$@" >&2
}

function verbose() {
        if [ -n "$VERBOSE" ]; then
                warn "$@"
        fi
}

function showHelp() {
        echo "Usage: $NAME [package]"
        echo "       Where package is in the form \"category/ebuild\""
        die 1
}

# Portage functions - which should be overridden...

function einfo() {
	echo "$@"
}

function ewarn() {
	echo "$@"
}

[ -r /etc/init.d/functions.sh ] && source /etc/init.d/functions.sh

[ -x "$( type -p equery )" ] || error "Please install \"app-portage/gentoolkit\""
[ -x "$( type -p portageq )" ] || error "Please install \"sys-apps/portage\""

if (( $# > 1 )); then
	showHelp
fi
if [ "$1" = "--help" -o "$1" = "-h" ]; then
	showHelp
fi

FIFO=${TMP:-/tmp}/$NAME.list
[ -e $FIFO ] && rm -f $FIFO
touch $FIFO
[ -f $FIFO ] || error "Cannot create or read from file \"$FIFO\""
TEMPFILE=${TMP:-/tmp}/$NAME.tmp
[ -e $TEMPFILE ] && rm -f $TEMPFILE
touch $TEMPFILE
[ -f $TEMPFILE ] || error "Cannot create or read from file \"$TEMPFILE\""

if (( 0 == $# )); then
	warn -n "Building package list... "
	$QPKG $QPKGOPTS | sed 's/^\[.*\] \[.*\] //' | grep -v "^$" | cut -d" " -f1 &>$FIFO
	warn -e "Done\n"
else
	warn -n "Building package list for \"$1\"... "
	$QPKG $QPKGOPTS | grep -i "\/$1-" | sed 's/^\[.*\] \[.*\] //' | grep -v "^$" | cut -d" " -f1 &>$FIFO
	# Grr... qpkg/equery doesn't return false if no packages exist
	if (( 0 == $( cat $FIFO | wc -l ) )); then
		error "Cannot find ebuild \"$1\""
	else
		warn -e "Found \"$( cat $FIFO )\"\n"
	fi
fi

PORTDIR="$( /usr/bin/portageq portdir 2>/dev/null )"
PORTDIR="${PORTDIR:-/usr/portage}"

while read LINE; do
	verbose "$NAME: Checking $LINE"
	DIR="$( echo $LINE | cut -d "/" -f 1 )"
	EBUILD="$( echo $LINE | cut -d " " -f 1 | cut -d "/" -f 2 )"
	PACKAGE="$( echo $EBUILD | sed 's/-[0-9].*$//' )"

	FILE="$PORTDIR/$DIR/$PACKAGE/$EBUILD.ebuild"
	if [ -r "$FILE" ]; then
		RESULT="$( grep pkg_config $FILE )"
		if [ -n "$RESULT" ]; then
			verbose "Running \"ebuild config\" for $FILE"
			echo "Configuration available: run \"ebuild $FILE config\"" >&2
		fi
		RESULT="$( grep pkg_postinst $FILE )"
		if [ -n "$RESULT" ]; then
			verbose "$FILE has post-install section"
			cat $FILE | awk ' \
				/^[[:space:]]*}[[:space:]]*$/						{ OUTPUT=0 } ; \
				OUTPUT==1								{ print $0 } ; \
				/^[[:space:]]*pkg_postinst[[:space:]]*(.*)[[:space:]]*{[[:space:]]*$/	{ OUTPUT=1 } ' > $TEMPFILE
			if [ -n "$( grep -E "ewarn|einfo" $TEMPFILE )" ]; then
				echo "$DIR/$EBUILD:"
				# This next step is potentially dangerous...
				eval "$( grep -E "^[[:space:]]*ewarn[[:space:]]+|^[[:space:]]*einfo[[:space:]]+" $TEMPFILE )"
			fi
		else
			if (( 0 != $# )); then
				echo "$FILE has no post-install section"
			fi
		fi
	else
		warn "Cannot find ebuild for $DIR/$EBUILD"
	fi
done < $FIFO

rm $FIFO $TEMPFILE
unset FIFO TEMPFILE