From e03f21ba522ca8a658ccbb7e22a4fba7c3196a43 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Thu, 21 Jan 2016 17:02:21 +0000
Subject: [PATCH] Do not recompile lua generated headers all time

---
 src/rspamadm/lua_preprocess.pl | 93 +++++++++++++++++++++++-----------
 1 file changed, 64 insertions(+), 29 deletions(-)

diff --git a/src/rspamadm/lua_preprocess.pl b/src/rspamadm/lua_preprocess.pl
index b17994684..d1e8f4689 100644
--- a/src/rspamadm/lua_preprocess.pl
+++ b/src/rspamadm/lua_preprocess.pl
@@ -2,50 +2,85 @@
 
 use warnings FATAL => 'all';
 use strict;
+use Digest::MD5;
 
-my ($in_dir, $out_dir) = @ARGV;
+my ( $in_dir, $out_dir ) = @ARGV;
 my @files = <$in_dir/*.lua>;
 
 sub quote_file {
-    my ($in, $out) = @_;
-
-    while (<$in>) {
-        if (/^--.USE\s*"(\S+)"$/) {
-            open(my $inc, '<', "$in_dir/$1.lua.in") or die "missing include $1";
-            quote_file($inc, $out);
-        }
-        else {
-            s/^\s*//; # remove unnecessary spaces at the beginning
-            next if /^--/; # skip comments
-            next if /^\s*$/; # skip empty lines
-            s/(.)/'$1',/g; # split as 'c',
-            s/\'\\\'/\'\\\\'/g; # escape backslashes
-            s/\'\'\'/\'\\\'\'/g; # escape single quotes
-            print $out "$_'\\n',";
-        }
-    }
+	my ( $in, $out ) = @_;
+
+	while (<$in>) {
+		if (/^--.USE\s*"(\S+)"$/) {
+			open( my $inc, '<', "$in_dir/$1.lua.in" )
+			  or die "missing include $1";
+			quote_file( $inc, $out );
+		}
+		else {
+			s/^\s*//;    # remove unnecessary spaces at the beginning
+			next if /^--/;      # skip comments
+			next if /^\s*$/;    # skip empty lines
+			s/(.)/'$1',/g;          # split as 'c',
+			s/\'\\\'/\'\\\\'/g;     # escape backslashes
+			s/\'\'\'/\'\\\'\'/g;    # escape single quotes
+			print $out "$_'\\n',";
+		}
+	}
 }
 
-foreach my $file (@files) {
-    if ($file =~ /([^\/.]+)(.lua)$/) {
-        my $fname = "$1$2";
-        my $varname = "rspamadm_script_$1";
-        my $definename = uc $varname;
+sub digest_for_file {
+	my ($file) = @_;
+
+	open( my $in, '<', $file ) or die "file missing";
+	my $digest = Digest::MD5->new->addfile($in)->hexdigest;
+
+	return $digest;
+}
+
+sub changed {
+	my ( $file, $outfile ) = @_;
 
-        open(my $in, '<', $file) or die "input missing";
-        open(my $out, '>', "$out_dir/$fname.h") or die "output missing";
+	open( my $out, '<', $outfile ) or return 1;
+
+	my $in_checksum = digest_for_file($file);
+	my $ln          = <$out>;
+
+	if ( $ln =~ /^.*id:(\S+)\s.*$/ ) {
+		if ( $in_checksum ne $1 ) {
+			return 1;
+		}
+		else {
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+foreach my $file (@files) {
+	if ( $file =~ /([^\/.]+)(.lua)$/ ) {
+		my $fname      = "$1$2";
+		my $varname    = "rspamadm_script_$1";
+		my $definename = uc $varname;
+		my $outfile    = "$out_dir/$fname.h";
 
-        print $out <<EOD;
+		if ( changed( $file, $outfile ) ) {
+			open( my $in,  '<', $file )    or die "input missing";
+			open( my $out, '>', $outfile ) or die "output missing";
+			my $checksum = digest_for_file($file);
+			print $out <<EOD;
+/* id:$checksum */
 #ifndef ${definename}_GUARD_H
 #define ${definename}_GUARD_H
 
 static const char ${varname}\[\] = {
 EOD
-        quote_file($in, $out);
+			quote_file( $in, $out );
 
-        print $out <<EOD;
+			print $out <<EOD;
 '\\0'};
 #endif
 EOD
-    }
+		}
+	}
 }
-- 
2.39.5