lyrics: converted in-process plugins to external programs

In-process plugins are very problematic.  It is much easier and
flexible to move the lyrics plugins to external programs, with a
trivial protocol.  This is work in progress, among the things missing:

 - protocol specification, including exit codes
 - plugin installation
 - plugin search directory
 - run-time configuration (currently hard coded)
 - automatic polling (using glib's main loop?)
 - better and more robust error handling

1 files changed, 68 insertions, 0 deletions

diff --git a/lyrics/leoslyrics.py b/lyrics/leoslyrics.py
new file mode 100755
index 000000000..0cee65aee
--- /dev/null
+++ b/lyrics/leoslyrics.py
@@ -0,0 +1,68 @@
+#!/usr/bin/python
+#
+# Load lyrics from leoslyrics.com
+#
+# Author: Max Kellermann <max@duempel.org>
+#
+
+from sys import argv, exit
+from urllib import urlencode, urlopen
+from xml.sax import make_parser, SAXException
+from xml.sax.handler import ContentHandler
+
+class SearchContentHandler(ContentHandler):
+    def __init__(self):
+        self.code = None
+        self.hid = None
+
+    def startElement(self, name, attrs):
+        if name == 'response':
+            self.code = int(attrs['code'])
+        elif name == 'result':
+            if self.hid is None or attrs['exactMatch'] == 'true':
+                self.hid = attrs['hid']
+
+def search(artist, title):
+    query = urlencode({'auth': 'ncmpc',
+                       'artist': artist,
+                       'songtitle': title})
+    url = "http://api.leoslyrics.com/api_search.php?" + query
+    f = urlopen(url)
+    handler = SearchContentHandler()
+    parser = make_parser()
+    parser.setContentHandler(handler)
+    parser.parse(f)
+    return handler.hid
+
+class LyricsContentHandler(ContentHandler):
+    def __init__(self):
+        self.code = None
+        self.is_text = False
+        self.text = None
+
+    def startElement(self, name, attrs):
+        if name == 'text':
+            self.text = ''
+            self.is_text = True
+        else:
+            self.is_text = False
+
+    def characters(self, chars):
+        if self.is_text:
+            self.text += chars
+
+def lyrics(hid):
+    query = urlencode({'auth': 'ncmpc',
+                       'hid': hid})
+    url = "http://api.leoslyrics.com/api_lyrics.php?" + query
+    f = urlopen(url)
+    handler = LyricsContentHandler()
+    parser = make_parser()
+    parser.setContentHandler(handler)
+    parser.parse(f)
+    return handler.text
+
+hid = search(argv[1], argv[2])
+if hid is None:
+    exit(2)
+print lyrics(hid)