commit: move editor outside transaction

The commit editor is now invoked before files and manifest are
committed. The editor is now run with only the wlock held and aborting
an edit no longer requires rolling back a transaction. Changes to
files during a commit still result in undefined behavior.

(This is preliminary work for committing subrepositories)

mercurial/localrepo.py

@@ -810,9 +810,14 b' class localrepository(repo.repository):'
                 if f in ms and ms[f] == 'u':
                     raise util.Abort(_("unresolved merge conflicts "
                                                     "(see hg resolve)"))
+
             wctx = context.workingctx(self, (p1, p2), text, user, date,
                                       extra, changes)
-            ret = self.commitctx(wctx, editor, True)
+            if editor:
+                wctx._text = editor(self, wctx,
+                                    changes[1], changes[0], changes[2])
+
+            ret = self.commitctx(wctx, True)
             ms.reset()
 
             # update dirstate
@@ -829,7 +834,7 b' class localrepository(repo.repository):'
                 self.dirstate.invalidate() # didn't successfully commit
             wlock.release()
 
-    def commitctx(self, ctx, editor=None, error=False):
+    def commitctx(self, ctx, error=False):
         """Add a new revision to current repository.
 
         Revision information is passed via the context argument.
@@ -870,13 +875,6 b' class localrepository(repo.repository):'
                     else:
                         remove.append(f)
 
-            updated, added = [], []
-            for f in sorted(changed):
-                if f in m1 or f in m2:
-                    updated.append(f)
-                else:
-                    added.append(f)
-
             # update manifest
             m1.update(new)
             removed = [f for f in sorted(remove) if f in m1 or f in m2]
@@ -890,9 +888,6 b' class localrepository(repo.repository):'
                                    p2.manifestnode(), (new, removed1))
 
             text = ctx.description()
-            if editor:
-                text = editor(self, ctx, added, updated, removed)
-
             lines = [line.rstrip() for line in text.rstrip().splitlines()]
             while lines and not lines[0]:
                 del lines[0]

tests/test-commit.out

@@ -1,6 +1,4 b''
 % commit date test
-transaction abort!
-rollback completed
 abort: empty commit message
 abort: impossible time zone offset: 4444444
 abort: invalid date: '1\t15.1' 
@@ -116,6 +114,4 b" HG: branch 'default'"
 HG: added added
 HG: changed changed
 HG: removed removed
-transaction abort!
-rollback completed
 abort: empty commit message

tests/test-import.out

@@ -32,8 +32,6 b' added 1 changesets with 2 changes to 2 f'
 updating working directory
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
-transaction abort!
-rollback completed
 abort: empty commit message
 % import of plain diff should be ok with message
 requesting all changes
@@ -150,8 +148,6 b' added 1 changesets with 2 changes to 2 f'
 updating working directory
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
-transaction abort!
-rollback completed
 abort: empty commit message
 % hg export in email, should use patch header
 requesting all changes

tests/test-keyword.out

@@ -112,10 +112,6 b' A a'
 A b
 % default keyword expansion including commit hook
 % interrupted commit should not change state or run commit hook
-a
-b
-transaction abort!
-rollback completed
 abort: empty commit message
 % status
 A a
@@ -281,8 +277,6 b' xxx $'
 ignore $Id$
 a
 % interrupted commit should not change state
-transaction abort!
-rollback completed
 abort: empty commit message
 % status
 M a

tests/test-record.out

@@ -53,9 +53,7 b' date: Thu Jan 01 00:00:00 1970 +0'
 % select files but no hunks
 diff --git a/empty-rw b/empty-rw
 new file mode 100644
-examine changes to 'empty-rw'? [Ynsfdaq?]  transaction abort!
-rollback completed
-abort: empty commit message
+examine changes to 'empty-rw'? [Ynsfdaq?]  abort: empty commit message
 
 changeset:   -1:000000000000
 tag:         tip