revset: raise RepoLookupError to make present() predicate continue the query stable

revset: raise RepoLookupError to make present() predicate continue the query

Before this patch, "bookmark()", "named()" and "tag()" predicates
raise "Abort", when the specified pattern doesn't match against
existing ones.

This prevents "present()" predicate from continuing the query, because
it only catches "RepoLookupError".

This patch raises "RepoLookupError" instead of "Abort", to make
"present()" predicate continue the query, even if "bookmark()",
"named()" or "tag()" in the sub-query of it are aborted.

This patch doesn't contain raising "RepoLookupError" for "re:" pattern
in "tag()", because "tag()" treats it differently from others. Actions
of each predicates at failure of pattern matching can be summarized as
below:

  predicate  "literal:"  "re:"
  ---------- ----------- ------------
  bookmark   abort       abort
  named      abort       abort
  tag        abort       continue (*1)

  branch     abort       continue (*2)
  ---------- ----------- ------------

"tag()" may have to abort in the (*1) case for similarity, but this
change may break backward compatibility of existing revset queries. It
seems to have to be changed on "default" branch (with "BC" ?).

On the other hand, (*2) seems to be reasonable, even though it breaks
similarity, because "branch()" in this case doesn't check exact
existence of branches, but does pick up revisions of which branch
matches against the pattern.

This patch also adds tests for "branch()" to clarify behavior around
"present()" of similar predicates, even though this patch doesn't
change "branch()".

--- a/mercurial/revset.py	Sun Feb 01 09:36:47 2015 +0900
+++ b/mercurial/revset.py	Sat Jan 31 01:00:50 2015 +0900
@@ -496,7 +496,8 @@
         if kind == 'literal':
             bmrev = repo._bookmarks.get(pattern, None)
             if not bmrev:
-                raise util.Abort(_("bookmark '%s' does not exist") % bm)
+                raise error.RepoLookupError(_("bookmark '%s' does not exist")
+                                            % bm)
             bms.add(repo[bmrev].rev())
         else:
             matchrevs = set()
@@ -504,8 +505,8 @@
                 if matcher(name):
                     matchrevs.add(bmrev)
             if not matchrevs:
-                raise util.Abort(_("no bookmarks exist that match '%s'")
-                                 % pattern)
+                raise error.RepoLookupError(_("no bookmarks exist"
+                                              " that match '%s'") % pattern)
             for bmrev in matchrevs:
                 bms.add(repo[bmrev].rev())
     else:
@@ -1262,15 +1263,16 @@
     namespaces = set()
     if kind == 'literal':
         if pattern not in repo.names:
-            raise util.Abort(_("namespace '%s' does not exist") % ns)
+            raise error.RepoLookupError(_("namespace '%s' does not exist")
+                                        % ns)
         namespaces.add(repo.names[pattern])
     else:
         for name, ns in repo.names.iteritems():
             if matcher(name):
                 namespaces.add(ns)
         if not namespaces:
-            raise util.Abort(_("no namespace exists that match '%s'")
-                             % pattern)
+            raise error.RepoLookupError(_("no namespace exists"
+                                          " that match '%s'") % pattern)
 
     names = set()
     for ns in namespaces:
@@ -1816,7 +1818,8 @@
             # avoid resolving all tags
             tn = repo._tagscache.tags.get(pattern, None)
             if tn is None:
-                raise util.Abort(_("tag '%s' does not exist") % pattern)
+                raise error.RepoLookupError(_("tag '%s' does not exist")
+                                            % pattern)
             s = set([repo[tn].rev()])
         else:
             s = set([cl.rev(n) for t, n in repo.tagslist() if matcher(t)])

--- a/tests/test-bookmarks.t	Sun Feb 01 09:36:47 2015 +0900
+++ b/tests/test-bookmarks.t	Sat Jan 31 01:00:50 2015 +0900
@@ -133,8 +133,13 @@
   
 
   $ hg log -r 'bookmark(unknown)'
-  abort: bookmark 'unknown' does not exist
+  abort: bookmark 'unknown' does not exist!
   [255]
+  $ hg log -r 'bookmark("re:unknown")'
+  abort: no bookmarks exist that match 'unknown'!
+  [255]
+  $ hg log -r 'present(bookmark("literal:unknown"))'
+  $ hg log -r 'present(bookmark("re:unknown"))'
 
   $ hg help revsets | grep 'bookmark('
       "bookmark([name])"

--- a/tests/test-revset.t	Sun Feb 01 09:36:47 2015 +0900
+++ b/tests/test-revset.t	Sat Jan 31 01:00:50 2015 +0900
@@ -709,7 +709,7 @@
 we can use patterns when searching for tags
 
   $ log 'tag("1..*")'
-  abort: tag '1..*' does not exist
+  abort: tag '1..*' does not exist!
   [255]
   $ log 'tag("re:1..*")'
   6
@@ -720,11 +720,17 @@
   $ log 'tag("re:0..*")'
 
   $ log 'tag(unknown)'
-  abort: tag 'unknown' does not exist
+  abort: tag 'unknown' does not exist!
   [255]
+  $ log 'tag("re:unknown")'
+  $ log 'present(tag("unknown"))'
+  $ log 'present(tag("re:unknown"))'
   $ log 'branch(unknown)'
   abort: unknown revision 'unknown'!
   [255]
+  $ log 'branch("re:unknown")'
+  $ log 'present(branch("unknown"))'
+  $ log 'present(branch("re:unknown"))'
   $ log 'user(bob)'
   2
 
@@ -772,6 +778,15 @@
   3
   1
 
+  $ log 'named("unknown")'
+  abort: namespace 'unknown' does not exist!
+  [255]
+  $ log 'named("re:unknown")'
+  abort: no namespace exists that match 'unknown'!
+  [255]
+  $ log 'present(named("unknown"))'
+  $ log 'present(named("re:unknown"))'
+
 issue2437
 
   $ log '3 and p1(5)'