Add a script to indent make(1)'s .if/.for blocks.

Sponsored by:	Absolight

Tools/scripts/indent_make_if.pl

@@ -0,0 +1,42 @@
+#!/usr/bin/env perl
+# $FreeBSD$
+# perltidy -bext=/ -i=8 -et=8 -l=132 -pt=2 -ce -cti=1
+
+use strict;
+use utf8;
+use warnings;
+
+my $extension = '.orig';
+my $oldargv   = q{};
+my $indent;
+my $argvout;
+LINE: while (<>) {
+
+	# For each file, save a .orig backup.
+	if ($ARGV ne $oldargv) {
+		my $backup;
+		if ($extension !~ /[*]/) {
+			$backup = $ARGV . $extension;
+		} else {
+			($backup = $extension) =~ s/[*]/$ARGV/g;
+		}
+		rename $ARGV, $backup;
+		open $argvout, '>', $ARGV;
+		$oldargv = $ARGV;
+		$indent  = 0;
+	}
+
+	if (/^[.]\s*(?:if|for)/o) {    # if/for -> indent and increase indent
+		s/^[.]\s*/"." . "  " x $indent/oe;
+		$indent++;
+	} elsif (/^[.]\s*end(?:if|for)/o) {    # endif/endfor -> decrease indent and indent
+		$indent--;
+		s/^[.]\s*/"." . "  " x $indent/oe;
+	} elsif (/^[.]\s*(?:else|elif)/o) {    # else/elif -> indent one level down
+		s/^[.]\s*/"." . "  " x ($indent - 1)/oe;
+	}
+} continue {
+
+	# Print the line.
+	print {$argvout} $_;
+}