changeset 33823:a0aad86b3b6a

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
author Gregory Szorc <gregory.szorc@gmail.com>
date Sun, 06 Aug 2017 16:47:25 -0700
parents 558f5b2ee10e
children 707750e5310b
files mercurial/repository.py
diffstat 1 files changed, 36 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/mercurial/repository.py	Sun Aug 13 11:04:42 2017 -0700
+++ b/mercurial/repository.py	Sun Aug 06 16:47:25 2017 -0700
@@ -9,6 +9,11 @@
 
 import abc
 
+from .i18n import _
+from . import (
+    error,
+)
+
 class _basepeer(object):
     """Represents a "connection" to a repository.
 
@@ -228,5 +233,36 @@
         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."""