diff mercurial/merge.py @ 44270:f546d2170b0f

merge: introduce a clean_update() for that use-case

I find it hard to understand what value to pass for all the arguments
to `merge.update()`. I would like to introduce functions that are more
specific to each use-case. We already have `graft()`. This patch
introduces a `clean_update()` and uses it in some places to show that
it works.

Differential Revision: https://phab.mercurial-scm.org/D7902

--- a/mercurial/merge.py	Wed Feb 05 16:16:15 2020 -0500
+++ b/mercurial/merge.py	Wed Jan 15 15:30:25 2020 -0800
@@ -2597,6 +2597,15 @@
     return stats
 
 
+def clean_update(ctx, wc=None):
+    """Do a clean update to the given commit.
+
+    This involves updating to the commit and discarding any changes in the
+    working copy.
+    """
+    return update(ctx.repo(), ctx.rev(), branchmerge=False, force=True, wc=wc)
+
+
 def graft(
     repo,
     ctx,