[PATCH 1 of 7 V2 mergedriver] filemerge: add a wrapper around the filemerge function

[Siddharth Agarwal]

# HG changeset patch
# User Siddharth Agarwal <sid0 at fb.com>
# Date 1444591868 25200
#      Sun Oct 11 12:31:08 2015 -0700
# Node ID 395dc7b3880c9e2b3c485a418237cb8ca9191687
# Parent  f32ecec8697102c6daeda1f3a98711a8305f928d
filemerge: add a wrapper around the filemerge function

We'll introduce a separate premerge function that calls the same code.

diff --git a/hgext/largefiles/uisetup.py b/hgext/largefiles/uisetup.py
--- a/hgext/largefiles/uisetup.py
+++ b/hgext/largefiles/uisetup.py
@@ -102,7 +102,7 @@ def uisetup(ui):
                                     overrides.mergerecordupdates)
     entry = extensions.wrapfunction(merge, 'update',
                                     overrides.mergeupdate)
-    entry = extensions.wrapfunction(filemerge, 'filemerge',
+    entry = extensions.wrapfunction(filemerge, '_filemerge',
                                     overrides.overridefilemerge)
     entry = extensions.wrapfunction(cmdutil, 'copy',
                                     overrides.overridecopy)
diff --git a/mercurial/filemerge.py b/mercurial/filemerge.py
--- a/mercurial/filemerge.py
+++ b/mercurial/filemerge.py
@@ -435,7 +435,7 @@ def _formatlabels(repo, fcd, fco, fca, l
         newlabels.append(_formatconflictmarker(repo, ca, tmpl, labels[2], pad))
     return newlabels
 
-def filemerge(repo, mynode, orig, fcd, fco, fca, labels=None):
+def _filemerge(repo, mynode, orig, fcd, fco, fca, labels=None):
     """perform a 3-way merge in the working directory
 
     mynode = parent node before merge
@@ -567,5 +567,8 @@ def _check(r, ui, tool, fcd, files):
 
     return r
 
+def filemerge(repo, mynode, orig, fcd, fco, fca, labels=None):
+    return _filemerge(repo, mynode, orig, fcd, fco, fca, labels=labels)
+
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = internals.values()