repository: implement generic capability methods on peer class

These methods are part of the peer interface, are generic, and can
be implemented in terms of other members of the peer interface. So we
implement them on the peer base class as a convenience.

The implementation is essentially copied from peer.py. The code
in peer.py will eventually be deleted.

Differential Revision: https://phab.mercurial-scm.org/D334

mercurial/repository.py

@@ -9,6 +9,11 b' from __future__ import absolute_import'
 
 import abc
 
+from .i18n import _
+from . import (
+    error,
+)
+
 class _basepeer(object):
     """Represents a "connection" to a repository.
 
@@ -228,5 +233,36 b' class peer(_basepeer, _basewirecommands)'
         calls. However, they must all support this API.
         """
 
+    def capable(self, name):
+        """Determine support for a named capability.
+
+        Returns ``False`` if capability not supported.
+
+        Returns ``True`` if boolean capability is supported. Returns a string
+        if capability support is non-boolean.
+        """
+        caps = self.capabilities()
+        if name in caps:
+            return True
+
+        name = '%s=' % name
+        for cap in caps:
+            if cap.startswith(name):
+                return cap[len(name):]
+
+        return False
+
+    def requirecap(self, name, purpose):
+        """Require a capability to be present.
+
+        Raises a ``CapabilityError`` if the capability isn't present.
+        """
+        if self.capable(name):
+            return
+
+        raise error.CapabilityError(
+            _('cannot %s; remote repository does not support the %r '
+              'capability') % (purpose, name))
+
 class legacypeer(peer, _baselegacywirecommands):
     """peer but with support for legacy wire protocol commands."""