From cf2b01396b310e9c46c9acb1b835f4e222e2c9bf Mon Sep 17 00:00:00 2001
From: Marius Gavrilescu <marius@ieval.ro>
Date: Mon, 9 Mar 2015 17:09:38 +0200
Subject: [PATCH] Do not remake unmodified files

---
 make_static.PL | 52 ++++++++++++++++++++++++++++++++++----------------
 1 file changed, 36 insertions(+), 16 deletions(-)

diff --git a/make_static.PL b/make_static.PL
index fe06da9..0a10891 100644
--- a/make_static.PL
+++ b/make_static.PL
@@ -10,22 +10,42 @@ use File::Slurp qw/read_file write_file/;
 mkdir 'static';
 mkdir 'static/css';
 
-my $common_css;
-$common_css .= read_file $_ for <css/*.css>;
-for (<css/themes/*>) {
-	my ($theme) = m,themes/(.*)\.css,;
-	my $css = read_file $_;
-	$css .= $common_css;
-	write_file "static/css/$theme.css", CSS::Minifier::XS::minify $css;
+sub make_css {
+	my $common_css;
+	$common_css .= read_file $_ for <css/*.css>;
+	for (<css/themes/*>) {
+		my ($theme) = m,themes/(.*)\.css,;
+		my $css = read_file $_;
+		$css .= $common_css;
+		write_file "static/css/$theme.css", CSS::Minifier::XS::minify $css;
+	}
 }
 
-if (-f 'compiler.jar') {
-	system java => -jar => 'compiler.jar', qw,-O SIMPLE --create_source_map static/js.map --js_output_file static/js.js --language_in ECMASCRIPT5_STRICT --source_map_location_mapping js/|/static/js/,, <js/*>;
-	my $js = read_file 'static/js.js';
-	write_file 'static/js.js', '//# sourceMappingURL=/static/js.map', "\n", $js;
-	system 'cp', '-rp', 'js', 'static/';
-} else {
-	my $js;
-	$js .= read_file $_ for <js/*.js>;
-	write_file 'static/js.js', JavaScript::Minifier::XS::minify $js;
+sub make_js {
+	if (-f 'compiler.jar') {
+		system java => -jar => 'compiler.jar', qw,-O SIMPLE --create_source_map static/js.map --js_output_file static/js.js --language_in ECMASCRIPT5_STRICT --source_map_location_mapping js/|/static/js/,, <js/*>;
+		my $js = read_file 'static/js.js';
+		write_file 'static/js.js', '//# sourceMappingURL=/static/js.map', "\n", $js;
+		system 'cp', '-rp', 'js', 'static/';
+	} else {
+		my $js;
+		$js .= read_file $_ for <js/*.js>;
+		write_file 'static/js.js', JavaScript::Minifier::XS::minify $js;
+	}
+}
+
+my $css_mtime = -M 'static/css/slate.css' // 0;
+for (<css/*>, <css/themes/*>) {
+	if (!$css_mtime || $css_mtime > -M) {
+		make_css;
+		last
+	}
+}
+
+my $js_mtime = -M 'static/js.js' // 0;
+for (<js/*>) {
+	if (!$js_mtime || $js_mtime > -M) {
+		make_js;
+		last
+	}
 }
-- 
2.30.2