did even more refactoring with the suggestions of sampsyo. added documentation page

beetsplug/fix_permissions.py

@@ -1,40 +0,0 @@
-'''
-Fixes file permissions after the file gets written on import.
-
-Put something like the following in your config.yaml to configure:
-
-    fix_permissions:
-            file: '644'
-
-IMPORTANT: Needs to be a string.
-'''
-
-import os
-from beets import config
-from beets.plugins import BeetsPlugin
-
-
-def check_permissions(path, permission):
-    ''' checks the permissions on the written path '''
-    return oct(os.stat(path).st_mode & 0o777) == oct(permission)
-
-
-class FixPermissions(BeetsPlugin):
-    ''' our plugin class '''
-    pass
-
-
-@FixPermissions.listen('after_write')
-def fix_permissions(path):
-    ''' running the permission fixer '''
-
-    # getting the config
-    file_perm = int(config['fix_permissions'].get()['file'], 8)
-
-    # doing the permission magic
-    os.chmod(path, file_perm)
-
-    # check permissions
-    if not check_permissions(path, file_perm):
-        message = 'There was a problem fixing permission on {}'.format(path)
-        print(message)

beetsplug/permissions.py

@@ -0,0 +1,48 @@
+"""Fixes file permissions after the file gets written on import. Put something
+like the following in your config.yaml to configure:
+
+    permissions:
+            file: 644
+"""
+import os
+from beets import config, util
+from beets.plugins import BeetsPlugin
+
+
+def check_permissions(path, permission):
+    """Checks the permissions of a path.
+    """
+    return oct(os.stat(path).st_mode & 0o777) == oct(permission)
+
+
+class Permissions(BeetsPlugin):
+    def __init__(self):
+        super(Permissions, self).__init__()
+
+        # Adding defaults.
+        self.config.add({
+            u'file': 644
+        })
+
+
+@Permissions.listen('after_write')
+def permissions(path):
+    """Running the permission fixer.
+    """
+    # Getting the config
+    file_perm = config['permissions']['file'].get()
+
+    # If the config is a int it will first convert it to a string and back
+    # to an oct int. Else it just converts it to oct.
+    if isinstance(file_perm, int):
+        file_perm = int(str(file_perm), 8)
+    else:
+        file_perm = int(file_perm, 8)
+
+    # Changing permissions on the path.
+    os.chmod(util.bytestring_path(path), file_perm)
+
+    # Checks if the path has the permissions configured.
+    if not check_permissions(util.bytestring_path(path), file_perm):
+        message = 'There was a problem setting permission on {}'.format(path)
+        print(message)

docs/plugins/permissions.rst

@@ -0,0 +1,18 @@
+Permissions Plugin
+==================
+
+The ``permissions`` plugin allows you to set file permissions after they got written.
+
+To use the ``permissions`` plugin, enable it in your configuration (see
+:ref:`using-plugins`).
+
+Configuration
+-------------
+
+To configure the plugin, make an ``permissions:`` section in your configuration
+file. You need to use **octal modes** to configure permissions. 
+
+Here's an example::
+
+    permissions:
+        file: 644