ConfigManager: add a method to remove an entry

application/config/ConfigManager.php

@@ -147,6 +147,33 @@ public function set($setting, $value, $write = false, $isLoggedIn = false)
         }
     }
 
+    /**
+     * Remove a config element from the config file.
+     *
+     * @param string $setting    Asked setting, keys separated with dots.
+     * @param bool   $write      Write the new setting in the config file, default false.
+     * @param bool   $isLoggedIn User login state, default false.
+     *
+     * @throws \Exception Invalid
+     */
+    public function remove($setting, $write = false, $isLoggedIn = false)
+    {
+        if (empty($setting) || ! is_string($setting)) {
+            throw new \Exception(t('Invalid setting key parameter. String expected, got: '). gettype($setting));
+        }
+
+        // During the ConfigIO transition, map legacy settings to the new ones.
+        if ($this->configIO instanceof ConfigPhp && isset(ConfigPhp::$LEGACY_KEYS_MAPPING[$setting])) {
+            $setting = ConfigPhp::$LEGACY_KEYS_MAPPING[$setting];
+        }
+
+        $settings = explode('.', $setting);
+        self::removeConfig($settings, $this->loadedConfig);
+        if ($write) {
+            $this->write($isLoggedIn);
+        }
+    }
+
     /**
      * Check if a settings exists.
      *
@@ -289,6 +316,27 @@ protected static function setConfig($settings, $value, &$conf)
         $conf[$setting] = $value;
     }
 
+    /**
+     * Recursive function which find asked setting in the loaded config and deletes it.
+     *
+     * @param array $settings Ordered array which contains keys to find.
+     * @param array $conf     Loaded settings, then sub-array.
+     *
+     * @return mixed Found setting or NOT_FOUND flag.
+     */
+    protected static function removeConfig($settings, &$conf)
+    {
+        if (!is_array($settings) || count($settings) == 0) {
+            return self::$NOT_FOUND;
+        }
+
+        $setting = array_shift($settings);
+        if (count($settings) > 0) {
+            return self::removeConfig($settings, $conf[$setting]);
+        }
+        unset($conf[$setting]);
+    }
+
     /**
      * Set a bunch of default values allowing Shaarli to start without a config file.
      */

tests/config/ConfigManagerTest.php

@@ -81,6 +81,18 @@ public function testSetWriteGetNested()
         $this->assertEquals('testSetWriteGetNested', $this->conf->get('foo.bar.key.stuff'));
     }
 
+    public function testSetDeleteNested()
+    {
+        $this->conf->set('foo.bar.key.stuff', 'testSetDeleteNested');
+        $this->assertTrue($this->conf->exists('foo.bar'));
+        $this->assertTrue($this->conf->exists('foo.bar.key.stuff'));
+        $this->assertEquals('testSetDeleteNested', $this->conf->get('foo.bar.key.stuff'));
+
+        $this->conf->remove('foo.bar');
+        $this->assertFalse($this->conf->exists('foo.bar.key.stuff'));
+        $this->assertFalse($this->conf->exists('foo.bar'));
+    }
+
     /**
      * Set with an empty key.
      *
@@ -103,6 +115,17 @@ public function testSetArrayKey()
         $this->conf->set(array('foo' => 'bar'), 'stuff');
     }
 
+    /**
+     * Remove with an empty key.
+     *
+     * @expectedException \Exception
+     * @expectedExceptionMessageRegExp #^Invalid setting key parameter. String expected, got.*#
+     */
+    public function testRmoveEmptyKey()
+    {
+        $this->conf->remove('');
+    }
+
     /**
      * Try to write the config without mandatory parameter (e.g. 'login').
      *