# HG changeset patch
# User Phil Cohen <phillco@fb.com>
# Date 2017-08-14 03:06:52
# Node ID b3571dc0e6b8ddc21d5ba9c13acf9dd08ffae74b
# Parent  de573184686e01c9d56c0ee79d0bcdc81e310370

simplemerge: add optional context parameters to simplemerge

Rename the existing parameters for clarity.

These will, in subsequent patches, allow callers to redirect reads (of the
three sides of the merge) and writes (of the result) to the given contexts,
instead of using the filesystem.

While in most cases, the writes will go to a workingfilectx, this opens the
door for it to be a memfilectx in the case of an in-memory merge.

Repo will be necessary in a subsequent comit.

Differential Revision: https://phab.mercurial-scm.org/D372

diff --git a/mercurial/simplemerge.py b/mercurial/simplemerge.py
--- a/mercurial/simplemerge.py
+++ b/mercurial/simplemerge.py
@@ -408,7 +408,8 @@ def _verifytext(text, path, ui, opts):
             raise error.Abort(msg)
     return text
 
-def simplemerge(ui, local, base, other, **opts):
+def simplemerge(ui, localfile, basefile, otherfile,
+                localctx=None, basectx=None, otherctx=None, repo=None, **opts):
     def readfile(filename):
         f = open(filename, "rb")
         text = f.read()
@@ -421,8 +422,8 @@ def simplemerge(ui, local, base, other, 
         name_b = None
         name_base = None
     else:
-        name_a = local
-        name_b = other
+        name_a = localfile
+        name_b = otherfile
         name_base = None
         labels = opts.get('label', [])
         if len(labels) > 0:
@@ -435,16 +436,16 @@ def simplemerge(ui, local, base, other, 
             raise error.Abort(_("can only specify three labels."))
 
     try:
-        localtext = readfile(local)
-        basetext = readfile(base)
-        othertext = readfile(other)
+        localtext = readfile(localfile)
+        basetext = readfile(basefile)
+        othertext = readfile(otherfile)
     except error.Abort:
         return 1
 
-    local = os.path.realpath(local)
+    localfile = os.path.realpath(localfile)
     if not opts.get('print'):
-        opener = vfsmod.vfs(os.path.dirname(local))
-        out = opener(os.path.basename(local), "w", atomictemp=True)
+        opener = vfsmod.vfs(os.path.dirname(localfile))
+        out = opener(os.path.basename(localfile), "w", atomictemp=True)
     else:
         out = ui.fout