#!/bin/sh
#
# lint_includes -- look for unneeded includes via lint
#
#	Runs lint, looks for the following messages:
#	E_INCL_MNO_US include file may be unnecessary: %s
#	E_INCL_MNO_US_TITLE include file may be unnecessary
#	E_INCL_MNUSD include file may be unnecessary: %s
#	E_INCL_MNUSD_TITLE include file may be unnecessary
#	E_INCL_NO_US include file is unnecessary: %s
#	E_INCL_NO_US_TITLE include file is unnecessary
#	E_INCL_NUSD include file is unnecessary: %s
#	E_INCL_NUSD_TITLE include file is unnecessary
#
ProgName=`basename $0`
Verbose=0

# Turn on almost everything, but use one-line errors for greping.
LINTOPTS='-errchk -errhdr=%all -errfmt=simple -errsecurity -Nlevel -Ncheck=macro -XCC -Xtransition -errtags'

main() {

	if [ $# -lt 1 ]; then
		say "$ProgName error: you must supply at least one C file"
		say "Usage: $0 file"
		exit 1
	fi
	if [ "$1" = "-v" ]; then
		Verbose=1
		shift
	fi
						
	lint $LINTOPTS "$@" 2>&1 |\
	if [ $Verbose -eq 1 ]; then
		cat
	else
		postprocess
	fi
}

#
# postprocess -- make multi-line message single-line and filter.
#
postprocess() {

	nawk '
	BEGIN { prev = ""; }
	/.*/ {
		# print ">>> " $0;
		if ( $0 ~ /^lint/) {
			# print "<<< lint error"
			# Lint error, print it
			print $0;
			prev = "";
		}
		else if ($0 ~ /E_INCL_[MN][NOU]/) {
			# print "<<< matched"
			# Matched, see if it was multi-line
			if ($0 !~ /^"/ && prev != "") {
				# print "<<< multi-line";
				printf("%s ", prev);
				prev = "";
			}
			# print "<<< the matched line";
			print $0;
		}
		else if ($0 ~ /^"/) {
			# beginning of a possible multi-line message
			# print "<<< saved for possible multi-line";
			prev = $0;
		}
	}
'
}

say() {
	echo "$@" 1>&2
}

main "$@"