Start linux implementation of Open with

src/calibre/gui2/open_with.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python2
+# vim:fileencoding=utf-8
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__ = 'GPL v3'
+__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
+
+import os
+
+from calibre import force_unicode, walk
+from calibre.constants import iswindows, isosx, filesystem_encoding
+
+if iswindows:
+    pass
+elif isosx:
+    pass
+else:
+    def parse_desktop_file(path):
+        try:
+            with open(path, 'rb') as f:
+                raw = f.read()
+                raw
+        except EnvironmentError:
+            return
+
+    def find_programs(extensions):
+        extensions = {ext.lower() for ext in extensions}
+        data_dirs = [os.environ.get('XDG_DATA_HOME') or os.path.expanduser('~/.local/share')]
+        data_dirs += (os.environ.get('XDG_DATA_DIRS') or '/usr/local/share/:/usr/share/').split(os.pathsep)
+        data_dirs = [force_unicode(x, filesystem_encoding).rstrip(os.sep) for x in data_dirs]
+        data_dirs = [x for x in data_dirs if x and os.path.isdir(x)]
+        desktop_files = {}
+        for base in data_dirs:
+            for f in walk(os.path.join(base, 'applications')):
+                if f.endswith('.desktop'):
+                    bn = os.path.basename(f)
+                    if f not in desktop_files:
+                        desktop_files[bn] = f
+
+if __name__ == '__main__':
+    print (find_programs('jpg jpeg'.split()))
+