1 files changed, 48 insertions, 0 deletions
diff --git a/youtube_dl/postprocessor/metadatafromtitle.py b/youtube_dl/postprocessor/metadatafromtitle.py
new file mode 100644
index 0000000..f5c14d9
--- /dev/null
+++ b/youtube_dl/postprocessor/metadatafromtitle.py
@@ -0,0 +1,48 @@
+from __future__ import unicode_literals
+
+import re
+
+from .common import PostProcessor
+
+
+class MetadataFromTitlePP(PostProcessor):
+    def __init__(self, downloader, titleformat):
+        super(MetadataFromTitlePP, self).__init__(downloader)
+        self._titleformat = titleformat
+        self._titleregex = (self.format_to_regex(titleformat)
+                            if re.search(r'%\(\w+\)s', titleformat)
+                            else titleformat)
+
+    def format_to_regex(self, fmt):
+        r"""
+        Converts a string like
+           '%(title)s - %(artist)s'
+        to a regex like
+           '(?P<title>.+)\ \-\ (?P<artist>.+)'
+        """
+        lastpos = 0
+        regex = ''
+        # replace %(..)s with regex group and escape other string parts
+        for match in re.finditer(r'%\((\w+)\)s', fmt):
+            regex += re.escape(fmt[lastpos:match.start()])
+            regex += r'(?P<' + match.group(1) + '>.+)'
+            lastpos = match.end()
+        if lastpos < len(fmt):
+            regex += re.escape(fmt[lastpos:])
+        return regex
+
+    def run(self, info):
+        title = info['title']
+        match = re.match(self._titleregex, title)
+        if match is None:
+            self._downloader.to_screen(
+                '[fromtitle] Could not interpret title of video as "%s"'
+                % self._titleformat)
+            return [], info
+        for attribute, value in match.groupdict().items():
+            info[attribute] = value
+            self._downloader.to_screen(
+                '[fromtitle] parsed %s: %s'
+                % (attribute, value if value is not None else 'NA'))
+
+        return [], info