revset: make match function initiate query from full set by default

This change is intended to avoid exposing the implementation detail to
callers. I'm going to extend fullreposet to support "null" revision, so
these mfunc calls will have to use fullreposet() instead of spanset().

mercurial/commands.py

@@ -2885,7 +2885,7 b' def debugrevspec(ui, repo, expr, **opts)'
             weight, optimizedtree = revset.optimize(newtree, True)
             ui.note("* optimized:\n", revset.prettyformat(optimizedtree), "\n")
     func = revset.match(ui, expr)
-    for c in func(repo, revset.spanset(repo)):
+    for c in func(repo):
         ui.write("%s\n" % c)
 
 @command('debugsetparents', [], _('REV1 [REV2]'))

mercurial/hgweb/webcommands.py

@@ -237,7 +237,7 b' def _search(web, req, tmpl):'
 
         mfunc = revset.match(web.repo.ui, revdef)
         try:
-            revs = mfunc(web.repo, revset.spanset(web.repo))
+            revs = mfunc(web.repo)
             return MODE_REVSET, revs
             # ParseError: wrongly placed tokens, wrongs arguments, etc
             # RepoLookupError: no such revision, e.g. in 'revision:'

mercurial/localrepo.py

@@ -482,7 +482,7 b' class localrepository(object):'
         '''Return a list of revisions matching the given revset'''
         expr = revset.formatspec(expr, *args)
         m = revset.match(None, expr)
-        return m(self, revset.spanset(self))
+        return m(self)
 
     def set(self, expr, *args):
         '''

mercurial/revset.py

@@ -2448,7 +2448,9 b' def match(ui, spec, repo=None):'
         tree = findaliases(ui, tree, showwarning=ui.warn)
     tree = foldconcat(tree)
     weight, tree = optimize(tree, True)
-    def mfunc(repo, subset):
+    def mfunc(repo, subset=None):
+        if subset is None:
+            subset = spanset(repo)
         if util.safehasattr(subset, 'isascending'):
             result = getset(repo, subset, tree)
         else:

mercurial/scmutil.py

@@ -672,11 +672,11 b' def revrange(repo, revs):'
         # fall through to new-style queries if old-style fails
         m = revset.match(repo.ui, spec, repo)
         if seen or l:
-            dl = [r for r in m(repo, revset.spanset(repo)) if r not in seen]
+            dl = [r for r in m(repo) if r not in seen]
             l = l + revset.baseset(dl)
             seen.update(dl)
         else:
-            l = m(repo, revset.spanset(repo))
+            l = m(repo)
 
     return l
 

mercurial/templater.py

@@ -393,7 +393,7 b' def revset(context, mapping, args):'
 
     def query(expr):
         m = revsetmod.match(repo.ui, expr)
-        return m(repo, revsetmod.spanset(repo))
+        return m(repo)
 
     if len(args) > 1:
         formatargs = list([a[0](context, mapping, a[1]) for a in args[1:]])