1 files changed, 78 insertions, 0 deletions
diff --git a/include/Minify.class.php b/include/Minify.class.php
new file mode 100644
index 0000000..ad66f32
--- /dev/null
+++ b/include/Minify.class.php
@@ -0,0 +1,78 @@
+<?php
+
+class Minify {
+
+    private static function _compileFiles($files, $directory, $compressor, $cacheFile) {
+        $lastmtime = self::_getMTime($files, $directory);
+        if (!file_exists($cacheFile) || filemtime($cacheFile) < $lastmtime) {
+            $out = '';
+            foreach ($files as $file) {
+                $fullPath = implode(
+                    DIRECTORY_SEPARATOR,
+                    [
+                        BASEPATH, 'src', $directory, $file
+                    ]
+                );
+                $content = file_get_contents($fullPath) . PHP_EOL;
+                if (!preg_match('/\.min\./', $file)) {
+                    $content = call_user_func($compressor, $content);
+                }
+                $out .= $content;
+            }
+            file_put_contents($cacheFile, $out);
+        }
+        return $lastmtime;
+    }
+
+    public static function minifyJS($scripts, $cacheFile) {
+        require_once(implode(
+            DIRECTORY_SEPARATOR,
+            [BASEPATH, 'lib', 'JShrink.php']
+        ));
+        return self::_compileFiles(
+            $scripts, '_js', array('Minifier', 'minify'), $cacheFile
+        );
+    }
+
+    public static function minifyCSS($sheets, $cacheFile) {
+        require_once(implode(
+            DIRECTORY_SEPARATOR,
+            [BASEPATH, 'lib', 'CssMin.php']
+        ));
+        return self::_compileFiles(
+            $sheets, '_css', array('CssMin', 'minify'), $cacheFile
+        );
+    }
+
+    private static function _getMTime($files, $directory) {
+        $timestamp = max(
+            array_map(
+                function($file) use($directory) {
+                    $path = implode(
+                        DIRECTORY_SEPARATOR,
+                        [BASEPATH, 'src', $directory, $file]
+                    );
+                    $mtime = filemtime($path);
+                    return $mtime;
+                },
+                $files
+            )
+        );
+        $resourceConfig = implode(
+            DIRECTORY_SEPARATOR,
+            [BASEPATH, 'config', 'resources.json']
+        );
+        if (file_exists($resourceConfig)) {
+            return max([filemtime($resourceConfig), $timestamp]);
+        }
+        return $timestamp;
+    }
+
+    public static function getMTime($scripts, $sheets) {
+        return max(self::_getMTime($scripts, '_js'),
+                   self::_getMTime($sheets, '_css'));
+    }
+
+}
+
+?>