[PATCH evolve-ext v3] evolve: make split respect rev args passed without --rev or -r

[Kostia Balytskyi]

# HG changeset patch
# User Kostia Balytskyi <ikostia at fb.com>
# Date 1454345046 28800
#      Mon Feb 01 08:44:06 2016 -0800
# Node ID a4e9419585c8137237bf268a69a8935ed2d14d26
# Parent  983f2e4dbe5d4d97d6ca82f6679913d75c1f2577
evolve: make split respect rev args passed without --rev or -r

Currently, if one runs `hg split .` or `hg split`, it will fail
with an exception. This happens becuase we only expect revision
args to be passed as --rev/-r ones and don't treat unnamed args
properly or add default values if no args are provided.

diff --git a/hgext/evolve.py b/hgext/evolve.py
--- a/hgext/evolve.py
+++ b/hgext/evolve.py
@@ -2729,15 +2729,12 @@
     tr = wlock = lock = None
     newcommits = []
 
-    revopt = opts.get('rev')
-    if revopt:
-        revs = scmutil.revrange(repo, revopt)
-        if len(revs) != 1:
-            raise error.Abort(_("you can only specify one revision to split"))
-        else:
-            rev = list(revs)[0]
+    revarg = (list(revs) + opts.get('rev')) or '.'
+    revs = scmutil.revrange(repo, revarg)
+    if len(revs) != 1:
+        raise error.Abort(_("you can only specify one revision to split"))
     else:
-        rev = '.'
+        rev = list(revs)[0]
 
     try:
         wlock = repo.wlock()
diff --git a/tests/test-split.t b/tests/test-split.t
--- a/tests/test-split.t
+++ b/tests/test-split.t
@@ -335,4 +335,41 @@
   abort: cannot split commit: ced8fbcce3a7 not a head
   [255]
 
+Changing evolution level to createmarkers
+  $ echo "[experimental]" >> $HGRCPATH
+  $ echo "evolution=createmarkers" >> $HGRCPATH
 
+Running split without any revision operates on the parent of the working copy
+  $ hg split << EOF
+  > q
+  > EOF
+  (leaving bookmark bookB)
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  adding _d
+  diff --git a/_d b/_d
+  new file mode 100644
+  examine changes to '_d'? [Ynesfdaq?] q
+  
+  abort: user quit
+  [255]
+
+Running split with tip revision, specified as unnamed argument
+  $ hg split . << EOF
+  > q
+  > EOF
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  adding _d
+  diff --git a/_d b/_d
+  new file mode 100644
+  examine changes to '_d'? [Ynesfdaq?] q
+  
+  abort: user quit
+  [255]
+
+Running split with both unnamed and named revision arguments shows an error msg
+  $ hg split . --rev .^ << EOF
+  > q
+  > EOF
+  abort: you can only specify one revision to split
+  [255]
+