#!/bin/bash
# read the CFLAGS line from an rpm .spec file and prune out the prefix stuff
# this is for spec files which have %build and the CFLAGS=blah blah ./configure ...
FOUND_LINE=0
while read LINE ; do
	(( LINE_COUNT++ )) 
	CHUNK=$LINE	
	if [[ ${CHUNK:0:7} = "CFLAGS=" ]] && [[ $FOUND_LINE -eq 0 ]] ; then
		if [[ ${CHUNK:8} != "" ]] ; then
			# get the CFLAGS -everything to the left of ./configure
			CFLAGS=${CHUNK%./configure*}
			# remove these variables which we don't use
			CFLAGS=${CFLAGS/\$RPM_OPT_FLAGS /}
			CFLAGS=${CFLAGS/\$EXTRACFLAGS/}
			# the configure options are everything to the right of ./configure
			CHUNK=${CHUNK#*./configure}
			# remove the --prefix stuff
			CHUNK=${CHUNK/--prefix=/}
			CHUNK=${CHUNK/\%\{_prefix\}/}
			# if --prefix was hard coded above then it still remains (/usr)
			# so skip to the next '--'option to the right
			CHUNK=--${CHUNK#*--}
			# substitute these rpm options with slackware defaults
			CHUNK=${CHUNK/\%\{_infodir\}/\/usr\/info}
			CHUNK=${CHUNK/\%\{_mandir\}/\/usr\/man}
			CHUNK=${CHUNK/\%\{_datadir\}/\/usr\/lib}
			CHUNK=${CHUNK/\%\{_sysconfdir\}/\/etc}
			echo $CFLAGS
			echo $CHUNK
		fi
		FOUND_LINE=1
	fi
done