Adds handling of the case where no document file is defined.

papers/commands/open_cmd.py

@@ -2,6 +2,7 @@ import subprocess
 
 from .. import color
 from .. import repo
+from ..paper import NoDocumentFile
 
 def parser(subparsers, config):
     parser = subparsers.add_parser('open', help='{}open the paper in a pdf viewer{}'.format(color.normal, color.end))
@@ -11,7 +12,15 @@ def parser(subparsers, config):
 def command(config, citekey):
     rp = repo.Repository()
     paper = rp.paper_from_any(citekey, fatal = True)
-    filepath = paper.metadata['path']
+    try:
+        if paper.check_file():
+            filepath = paper.get_file_path()
+
+            p = subprocess.Popen(['open', filepath])
+            print('{}{}{} opened.{}'.format(
+                color.filepath, filepath, color.normal, color.end))
+    except NoDocumentFile:
+        print('{}error{}: No document associated to this entry {}{}{}'.format(
+            color.error, color.normal, color.citekey, citekey, color.end))
+        exit(-1)
 
-    p = subprocess.Popen(['open', filepath])
-    print('{}{}{} opened.{}'.format(color.filepath, filepath, color.normal, color.end))