Create cache for Markdown content. #51

libs/Cache.php

@@ -0,0 +1,95 @@
+<?php namespace Todaymade\Daux;
+
+use Symfony\Component\Console\Output\OutputInterface;
+use Todaymade\Daux\Daux;
+
+class Cache {
+
+    static $printed = false;
+
+    protected static function getDirectory()
+    {
+        $dir = sys_get_temp_dir() . DIRECTORY_SEPARATOR . "dauxio" . DIRECTORY_SEPARATOR;
+
+        if (!Cache::$printed) {
+            Cache::$printed = true;
+            Daux::writeln("Using cache dir '$dir'", OutputInterface::VERBOSITY_VERBOSE);
+        }
+
+        return $dir;
+    }
+
+    /**
+     * Store an item in the cache for a given number of minutes.
+     *
+     * @param  string  $key
+     * @param  mixed   $value
+     * @return void
+     */
+    public static function put($key, $value)
+    {
+        Cache::ensureCacheDirectoryExists($path = Cache::path($key));
+        file_put_contents($path, serialize($value));
+    }
+
+    /**
+     * Create the file cache directory if necessary.
+     *
+     * @param  string  $path
+     * @return void
+     */
+    protected static function ensureCacheDirectoryExists($path)
+    {
+        $parent = dirname($path);
+
+        if (!file_exists($parent)) {
+            mkdir($parent, 0777, true);
+        }
+    }
+
+    /**
+     * Remove an item from the cache.
+     *
+     * @param  string  $key
+     * @return bool
+     */
+    public static function forget($key)
+    {
+        $path = Cache::path($key);
+
+        if (file_exists($path)) {
+            return unlink($path);
+        }
+
+        return false;
+    }
+
+    /**
+     * Retrieve an item from the cache by key.
+     *
+     * @param  string|array  $key
+     * @return mixed
+     */
+    public static function get($key)
+    {
+        $path = Cache::path($key);
+
+        if (file_exists($path)) {
+            return file_get_contents($path);
+        }
+
+        return null;
+    }
+
+    /**
+     * Get the full path for the given cache key.
+     *
+     * @param  string  $key
+     * @return string
+     */
+    protected static function path($key)
+    {
+        $parts = array_slice(str_split($hash = sha1($key), 2), 0, 2);
+        return Cache::getDirectory().'/'.implode('/', $parts).'/'.$hash;
+    }
+}