Do not remake unmodified files

diff --git a/make_static.PL b/make_static.PL
index fe06da94e4a10cadfca343d5fc8b06fa05e9a070..0a10891e04c3264a835fc4a5d1c9cb95475c1cdd 100644 (file)
--- 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
+       }
 }