--- a/mercurial/copies.py Wed Aug 07 19:18:20 2019 +0530
+++ b/mercurial/copies.py Tue Aug 06 03:17:40 2019 +0200
@@ -809,3 +809,28 @@
continue
if dst in wctx:
wctx[dst].markcopied(src)
+
+def computechangesetcopies(ctx):
+ """return the copies data for a changeset
+
+ The copies data are returned as a pair of dictionnary (p1copies, p2copies).
+
+ Each dictionnary are in the form: `{newname: oldname}`
+ """
+ p1copies = {}
+ p2copies = {}
+ p1 = ctx.p1()
+ p2 = ctx.p2()
+ narrowmatch = ctx._repo.narrowmatch()
+ for dst in ctx.files():
+ if not narrowmatch(dst) or dst not in ctx:
+ continue
+ copied = ctx[dst].renamed()
+ if not copied:
+ continue
+ src, srcnode = copied
+ if src in p1 and p1[src].filenode() == srcnode:
+ p1copies[dst] = src
+ elif src in p2 and p2[src].filenode() == srcnode:
+ p2copies[dst] = src
+ return p1copies, p2copies