#!/bin/sh -e

PROG="${0##*/}"

: "${TMPDIR:=$HOME/tmp}"
TMPFILE="$(mktemp "$TMPDIR/$PROG.XXXXXX")"

Exit()
{
	RETVAL=$?
	trap "" EXIT
	rm -f "$TMPFILE"
	exit $RETVAL
}

trap "Exit " SIGHUP SIGPIPE SIGINT SIGTERM EXIT

RemoveEmpty()
{
	awk 'BEGIN{empty=0} /^.+$/{empty=0} /^$/{if(!empty){print;empty=1}} {if(!empty)print $0}' <$1 >"$TMPFILE" &&
		cat "$TMPFILE" >"$1"
}

RemoveClean()
{
	awk 'BEGIN{clean=0} {printed=0} /^%(pre|post|trig|files|changelog)/{clean=0} /^./{if(clean){print "%clean";clean=0}} /^%clean$/{clean=1;printed=1} /^$/{if(clean){printed=1}} {if(!printed)print $0}' <$1 >"$TMPFILE" &&
		cat "$TMPFILE" >"$1"
}

CleanFiles()
{
	awk 'BEGIN{found=0} {printed=0} /^./{found=0} /^%(description|prep|build|install|pre|post|trig|files|changelog)([^_]|$)/{found=1} /^%(pre|post|trig).*[ 	]-p[ 	]/{found=0} /^$/{if(found)printed=1} {if(!printed)print $0}' <$1 >"$TMPFILE" &&
		cat "$TMPFILE" >"$1"
}

for F in "$@"; do
	perl -pi -e 's/%\{([A-Za-z_0-9]+)\}([^A-Za-z_0-9]|$)/%$1$2/g' "$F"
	perl -pi -e 's/%\{([A-Za-z_0-9]+)\}([^A-Za-z_0-9]|$)/%$1$2/g' "$F"
	perl -pi -e 's/%\{([A-Za-z_0-9]+)\}([^A-Za-z_0-9]|$)/%$1$2/g' "$F"
	perl -pi -e 's/[ 	]+$//g' "$F"
	perl -pi -e 's/^([A-Za-z_0-9]+:)[ 	]+/\1 /g' "$F"
	perl -pi -e 's/^%make\s+/%make_build /g;s/%_prefix/%prefix/g;s/%_initrddir/%_initdir/g;s/%_install_info/%install_info/g;s/%_remove_install_info/%uninstall_info/g' "$F"
	perl -pi -e 's/^prereq: /PreReq: /ig;s/^buildrequires: /BuildRequires: /ig;s/^buildprereq: /BuildPreReq: /ig' "$F"

	perl -pi -e 's/^buildroot: .*//ig' "$F"
	perl -pi -e 's/^rm\s+-rf\s+"?\$RPM_BUILD_ROOT"?$//g' "$F"
	perl -pi -e 's/^%defattr\s*\(\s*-\s*,\s*root\s*,\s*root\s*(,\s*(-|0?755)\s*)?\)//g' "$F"

	RemoveEmpty "$F"
	RemoveClean "$F"
	CleanFiles "$F"
done