Extension to run a command on download

closes #317

share/gpodder/extensions/command_on_download.py

@@ -0,0 +1,70 @@
+# -*- coding: utf-8 -*-
+#
+# gPodder extension for running a command on successful episode download
+#
+
+import datetime
+import logging
+import os
+import subprocess
+
+logger = logging.getLogger(__name__)
+
+__title__ = 'Run a Command on Download'
+__description__ = 'Run the `extensions.command_on_download.command` on download'
+__authors__ = 'Eric Le Lay <elelay@macports.org>'
+__category__ = 'post-download'
+
+
+DefaultConfig = {
+    'command': "zenity --info --width=600 --text=\"file=$filename "
+               "podcast=$podcast title=$title published=$published "
+               "section=$section playlist_title=$playlist_title\""
+}
+
+
+class gPodderExtension:
+    def __init__(self, container):
+        self.container = container
+
+    def on_episode_downloaded(self, episode):
+        cmd_template = self.container.config.command
+        info = self.read_episode_info(episode)
+        if info is None:
+            return
+
+        self.run_command(cmd_template, info)
+
+    def read_episode_info(self, episode):
+        filename = episode.local_filename(create=False, check_only=True)
+        if filename is None:
+            logger.warn("%s: missing episode filename", __title__)
+            return None
+        info = {
+            'filename': filename,
+            'playlist_title': None,
+            'podcast': None,
+            'published': None,
+            'section': None,
+            'title': None,
+        }
+
+        info['podcast'] = episode.channel.title
+        info['title'] = episode.title
+        info['section'] = episode.channel.section
+
+        published = datetime.datetime.fromtimestamp(episode.published)
+        info['published'] = published.strftime('%Y-%m-%d %H:%M')
+        info['playlist_title'] = episode.playlist_title()
+        return info
+
+    def run_command(self, command, info):
+        env = os.environ.copy()
+        env.update(info)
+
+        proc = subprocess.Popen(command, shell=True, env=env)
+        proc.wait()
+        if proc.returncode == 0:
+            logger.info("%s succeeded", command)
+        else:
+            logger.warn("%s run with exit code %i", command, proc.returncode)