Added plugin

beetsplug/substitute.py

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+# This file is part of beets.
+# Copyright 2016, Adrian Sampson.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+
+"""Uses user-specified substituting rules to canonicalize names for path
+formats without modifying the tags of the songs.
+"""
+from beets.plugins import BeetsPlugin
+import re
+
+_substitute_rules = []
+
+class Substitute(BeetsPlugin):
+    def __init__(self):
+        super(Substitute, self).__init__()
+        self.template_funcs['substitute'] = _tmpl_substitute
+
+        for key, view in self.config.items():
+            value = view.as_str()
+            pattern = re.compile(key.lower())
+            _substitute_rules.append((pattern, value))
+
+def _tmpl_substitute(text):
+    if text:
+         for pattern, replacement in _substitute_rules:
+              if pattern.match(text.lower()):
+                  return replacement
+         return text
+    else:
+         return u''

docs/plugins/substitute.rst

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+Substitute Plugin
+==============
+
+The ``substitute`` plugin lets you easily substitute values in your templates and
+path formats. Specifically, it is intended to let you *canonicalize* names
+such as artists: for example, perhaps you want albums from The Jimi Hendrix
+Experience to be sorted into the same folder as solo Hendrix albums.
+
+To use field substituting, first enable the ``substitute`` plugin
+(see :ref:`using-plugins`).
+Then, make a ``substitute:`` section in your config file to contain your rules.
+Each rule consists of a a regular expression pattern, and a
+replacement value. Rules are written ``regex: replacement``.
+For example, this line implements the Jimi Hendrix example above::
+
+    rewrite:
+        The Jimi Hendrix Experience: Jimi Hendrix
+
+The pattern is a case-insensitive regular expression. This means you can use
+ordinary regular expression syntax to match multiple artists. For example, you
+might use::
+
+    rewrite:
+        .*jimi hendrix.*: Jimi Hendrix
+
+This plugin is intented as a replacement for the ``rewrite`` plugin. Indeed, while
+the ``rewrite`` plugin modifies the metadata, this plugin does not.