Adds remove command.

papers/commands/__init__.py

@@ -6,4 +6,5 @@ import init_cmd
 import list_cmd
 import open_cmd
 import edit_cmd
+import remove_cmd
 import websearch_cmd

papers/commands/remove_cmd.py

@@ -0,0 +1,20 @@
+from .. import repo
+
+
+def parser(subparsers, config):
+    parser = subparsers.add_parser('remove', help='removes a paper')
+    parser.add_argument('reference',
+            help='reference to the paper (citekey or number)')
+    return parser
+
+
+def command(config, ui, reference):
+    rp = repo.Repository.from_directory()
+    key = rp.citekey_from_ref(reference, fatal=True)
+    paper = rp.paper_from_citekey(key)
+    are_you_sure = ("Are you sure you want to delete paper [%s]"
+        " (this will also delete associated documents)?"
+        % ui.colored(paper.citekey, color='citekey'))
+    sure = ui.input_yn(question=are_you_sure, default='n')
+    if sure:
+        rp.remove(paper.citekey)

papers/papers

@@ -17,6 +17,7 @@ cmds = collections.OrderedDict([
         ('export', commands.export_cmd),
         ('list', commands.list_cmd),
         ('edit', commands.edit_cmd),
+        ('remove', commands.remove_cmd),
         ('open', commands.open_cmd),
         ('websearch', commands.websearch_cmd)
         ])