filemerge: add non-interactive :merge-local and :merge-other

filemerge: add non-interactive :merge-local and :merge-other

There are two non-interactive internal merge tools, :other and :local,
but they don't really merge, they just pick all changes from the local
or other version of the file. In some situations, it is known that we
want a merge and also know that all merge conflicts should be resolved
in one direction. Although external merge tools can do this, sometimes
it can be convenient to do so from within hg, without invoking a merge
tool. These new :merge-local and :merge-other tools can do just that.

--- a/mercurial/filemerge.py	Wed Aug 12 08:53:01 2015 -0400
+++ b/mercurial/filemerge.py	Thu Sep 10 09:41:11 2015 -0400
@@ -286,6 +286,38 @@
         labels.append('base')
     return _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels)
 
+def _imergeauto(repo, mynode, orig, fcd, fco, fca, toolconf, files,
+                labels=None, localorother=None):
+    """
+    Generic driver for _imergelocal and _imergeother
+    """
+    assert localorother is not None
+    tool, toolpath, binary, symlink = toolconf
+    if symlink:
+        repo.ui.warn(_('warning: :merge-%s cannot merge symlinks '
+                       'for %s\n') % (localorother, fcd.path()))
+        return False, 1
+    a, b, c, back = files
+    r = simplemerge.simplemerge(repo.ui, a, b, c, label=labels,
+                                localorother=localorother)
+    return True, r
+
+@internaltool('merge-local', True)
+def _imergelocal(*args, **kwargs):
+    """
+    Like :merge, but resolve all conflicts non-interactively in favor
+    of the local changes."""
+    success, status = _imergeauto(localorother='local', *args, **kwargs)
+    return success, status
+
+@internaltool('merge-other', True)
+def _imergeother(*args, **kwargs):
+    """
+    Like :merge, but resolve all conflicts non-interactively in favor
+    of the other changes."""
+    success, status = _imergeauto(localorother='other', *args, **kwargs)
+    return success, status
+
 @internaltool('tagmerge', True,
               _("automatic tag merging of %s failed! "
                 "(use 'hg resolve --tool :merge' or another merge "

--- a/tests/test-conflict.t	Wed Aug 12 08:53:01 2015 -0400
+++ b/tests/test-conflict.t	Thu Sep 10 09:41:11 2015 -0400
@@ -232,3 +232,65 @@
   5
   >>>>>>> other
   Hop we are done.
+
+Add some unconflicting changes on each head, to make sure we really
+are merging, unlike :local and :other
+
+  $ hg up -C
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ printf "\n\nEnd of file\n" >> a
+  $ hg ci -m "Add some stuff at the end"
+  $ hg up -r 1
+  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ printf "Start of file\n\n\n" > tmp
+  $ cat a >> tmp
+  $ mv tmp a
+  $ hg ci -m "Add some stuff at the beginning"
+
+Now test :merge-other and :merge-local
+
+  $ hg merge
+  merging a
+  warning: conflicts during merge.
+  merging a incomplete! (edit conflicts, then use 'hg resolve --mark')
+  1 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
+  [1]
+  $ hg resolve --tool :merge-other a
+  merging a
+  (no more unresolved files)
+  $ cat a
+  Start of file
+  
+  
+  Small Mathematical Series.
+  1
+  2
+  3
+  6
+  8
+  Hop we are done.
+  
+  
+  End of file
+
+  $ hg up -C
+  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ hg merge --tool :merge-local
+  merging a
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)
+  $ cat a
+  Start of file
+  
+  
+  Small Mathematical Series.
+  1
+  2
+  3
+  4
+  5
+  Hop we are done.
+  
+  
+  End of file

--- a/tests/test-help.t	Wed Aug 12 08:53:01 2015 -0400
+++ b/tests/test-help.t	Thu Sep 10 09:41:11 2015 -0400
@@ -1220,6 +1220,14 @@
         partially merged file. Markers will have two sections, one for each side
         of merge.
   
+      ":merge-local"
+        Like :merge, but resolve all conflicts non-interactively in favor of the
+        local changes.
+  
+      ":merge-other"
+        Like :merge, but resolve all conflicts non-interactively in favor of the
+        other changes.
+  
       ":merge3"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will fail if there are any conflicts and leave markers in the