Adds option to open document with another programm.

papers/commands/open_cmd.py

@@ -8,20 +8,26 @@ from .. import configs
 def parser(subparsers, config):
     parser = subparsers.add_parser('open',
             help='open the paper in a pdf viewer')
+    parser.add_argument('-w', '--with', dest='with_command', default=None,
+            help='command to use to open the document file')
     parser.add_argument('citekey',
             help='the paper associated citekey')
     return parser
 
 
-def command(config, ui, citekey):
+def command(config, ui, with_command, citekey):
     rp = repo.Repository.from_directory(config)
     paper = rp.paper_from_ref(citekey, fatal=True)
+    if with_command is None:
+        with_command = config.get(configs.MAIN_SECTION, 'open-cmd')
     try:
         filepath = paper.get_document_path()
-        subprocess.Popen([config.get(configs.MAIN_SECTION, 'open-cmd'),
-                          filepath])
-        print("%s opened." % ui.colored(filepath, 'filepath'))
+        subprocess.Popen([with_command, filepath])
+        ui.print_("%s opened." % ui.colored(filepath, 'filepath'))
     except NoDocumentFile:
         ui.error("No document associated with the entry %s."
                  % ui.colored(citekey, 'citekey'))
         ui.exit()
+    except OSError:
+        ui.error("Command does not exist: %s." % with_command)
+        ui.exit(127)