update check at startup

papers/configs.py

@@ -15,17 +15,18 @@ DFT_PLUGINS = ''
 
 DFT_CONFIG = {'papers_dir'  : os.path.expanduser('~/.papers'),
               'doc_dir'     : 'doc',
-              'import_copy' : 'yes',
-              'import_move' : 'no',
-              'color'       : 'yes',
+              'import_copy' : True,
+              'import_move' : False,
+              'color'       : True,
               'version'     : 3,
+              'version_warning' : True,
 
               'open_cmd'    : 'open',
               'edit_cmd'    : DFT_EDIT_CMD,
               'plugins'     : DFT_PLUGINS
              }
 
-BOOLEANS = {'import_copy', 'import_move', 'color'}
+BOOLEANS = {'import_copy', 'import_move', 'color', 'version_warning'}
 
 
 # package-shared config that can be accessed using :

papers/papers_cmd.py

@@ -9,6 +9,7 @@ from .ui import UI
 from . import configs
 from . import commands
 from . import plugins
+from .__init__ import __version__
 
 cmds = collections.OrderedDict([
         ('init',        commands.init_cmd),
@@ -25,6 +26,26 @@ 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)')
+            sys.exit()
+        elif repo_version < code_version:
+            ui.print_(
+                'warning: your repository version (v{})'.format(repo_version)
+                + 'must be updated to version {}.\n'.format(code_version)
+                + "run 'papers update'.")
+            sys.exit()
+
 
 def execute(raw_args = sys.argv):
     # loading config
@@ -34,6 +55,8 @@ def execute(raw_args = sys.argv):
 
     ui = UI(config)
 
+    _update_check(config, ui)
+
     # Extend with plugin commands
     plugins.load_plugins(ui, config.plugins.split())
     for p in plugins.get_plugins().values():