Simplifies loading of plugins parsers.

- Plugins now only present a get_commands method taking the parser to
  populate as argument and returning an iterable with which the cmds
  dictionary is updated (i.e. the plugins returns the command callbacks).
- The name attribute in plugins is now a class attribute.

papers/papers_cmd.py

@@ -11,6 +11,7 @@ from . import commands
 from . import plugins
 from .__init__ import __version__
 
+
 cmds = collections.OrderedDict([
         ('init',        commands.init_cmd),
         ('add',         commands.add_cmd),
@@ -26,18 +27,20 @@ cmds = collections.OrderedDict([
         ('update',      commands.update_cmd),
         ])
 
+
 def _update_check(config, ui):
     if config.version_warning:
         code_version = int(__version__)
         repo_version = int(config.version)
 
         if repo_version > code_version:
-            ui.print_('warning: your repository was generated with an newer version'
-                      ' of papers (v{}) than the one you are using (v{}).\n'.format(
-                       repo_version, code_version) +
-                      '         you should not use papers until you install the '
-                      'newest version. (use version_warning in you papersrc '
-                      'to bypass this error)')
+            ui.warning(
+                    'your repository was generated with an newer version'
+                    ' of papers (v{}) than the one you are using (v{}).'
+                    '\n'.format(repo_version, code_version) +
+                    'You should not use papers until you install the '
+                    'newest version. (use version_warning in you papersrc '
+                    'to bypass this error)')
             sys.exit()
         elif repo_version < code_version:
             ui.print_(
@@ -47,7 +50,7 @@ def _update_check(config, ui):
             sys.exit()
 
 
-def execute(raw_args = sys.argv):
+def execute(raw_args=sys.argv):
     # loading config
     config = configs.Config()
     config.load()
@@ -58,17 +61,16 @@ def execute(raw_args = sys.argv):
 
     _update_check(config, ui)
 
-    # Extend with plugin commands
-    plugins.load_plugins(ui, config.plugins.split())
-    for p in plugins.get_plugins().values():
-        if getattr(p, 'parser') and getattr(p, 'command'):
-            cmds.update(collections.OrderedDict([(p.name, p)]))
-
     parser = argparse.ArgumentParser(description="research papers repository")
     subparsers = parser.add_subparsers(title="valid commands", dest="command")
 
     for cmd_mod in cmds.values():
-        subparser = cmd_mod.parser(subparsers)  # why do we return the subparser ?
+        cmd_mod.parser(subparsers)
+
+    # Extend with plugin commands
+    plugins.load_plugins(ui, config.plugins.split())
+    for p in plugins.get_plugins().values():
+        cmds.update(p.get_commands(subparsers))
 
     args = parser.parse_args(raw_args[1:])
     cmd = args.command

papers/plugins.py

@@ -11,34 +11,14 @@ class PapersPlugin(object):
     functionality by defining a subclass of PapersPlugin and overriding
     the abstract methods defined here.
     """
-    def __init__(self):
-        """Perform one-time plugin setup.
+
+    name = None
+
+    def get_commands(self, subparsers):
+        """Populates the parser with plugins specific command.
+        Returns iterable of pairs (command name, command function to call).
         """
-        self.name = self.__module__.split('.')[-1]
-
-    #ui and given again to stay consistent with the core papers cmd.
-    #two options:
-    #- create specific cases in script papers/papers
-    #- do not store self.ui and use them if needed when command is called
-    #this may end up with a lot of function with config/ui in argument
-    #or just keep it that way...
-    def parser(self, subparsers):
-        """ Should return the parser with plugins specific command.
-        This is a basic example
-        """
-        parser = subparsers.add_parser(self.name, help="echo string in argument")
-        parser.add_argument('strings', nargs='*', help='the strings')
-        return parser
-
-    def command(self, args):
-        """This function will be called with argument defined in the parser above
-        This is a basic example
-        """
-
-        strings = args.strings
-
-        for s in strings:
-            print(s)
+        return []
 
     @classmethod
     def get_instance(cls):

papers/plugs/texnote/texnote.py

@@ -36,9 +36,9 @@ DFT_BIBSTYLE_INFO = 'ieeetr'
 
 class TexnotePlugin(PapersPlugin):
 
-    def __init__(self):
-        self.name = SECTION
+    name = SECTION
 
+    def __init__(self):
         self.texcmds = collections.OrderedDict([
                         ('remove', self.remove),
                         ('edit', self.edit),
@@ -61,7 +61,7 @@ class TexnotePlugin(PapersPlugin):
         if not files.check_file(TPL_BIB):
             self.generate_bib()
 
-    def parser(self, subparsers):
+    def get_commands(self, subparsers):
         parser = subparsers.add_parser(self.name, help='edit advance note in latex')
         sub = parser.add_subparsers(title='valid texnote commands', dest='texcmd')
         # remove
@@ -113,7 +113,7 @@ class TexnotePlugin(PapersPlugin):
         p = sub.add_parser('extract_note',
                 help='extract core note from its reference')
         add_references_argument(p, single=True)
-        return parser
+        return [(self.name, self.command)]
 
     def command(self, args):
         self._ensure_init()