Add pastealacon backend for CapPaste

Sadly, not posting for now, for two reasons:
* we get a captcha very often
* the form page seems invalid and mechanize is not able to select the form

weboob/backends/pastealacon/pages.py

@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+
+# Copyright(C) 2011 Laurent Bachelier
+#
+# This file is part of weboob.
+#
+# weboob is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# weboob is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with weboob. If not, see <http://www.gnu.org/licenses/>.
+
+
+from weboob.tools.browser import BasePage
+
+from urlparse import urlparse
+import re
+
+__all__ = ['PastePage']
+
+class PastePage(BasePage):
+    def fill_paste(self, paste):
+        root = self.document.getroot()
+        header = self.parser.select(root, 'id("content")//h3', 1, 'xpath')
+        matches = re.match(r'Posted by (?P<author>.+) on (?P<date>.+) \(', header.text)
+        paste.title = matches.groupdict().get('author')
+        paste.contents = self.parser.select(root, '//textarea[@id="code"]', 1, 'xpath').text
+        return paste
+
+    def get_id(self):
+        """
+        Find out the ID from the URL
+        """
+        path = urlparse(self.url).path
+        return path[1:]