# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1523630707 -32400
# Node ID 141017c7f7a96a44c8fabb12b5d2b30d911abb24
# Parent  03d7f885d5f2cbf25ebcb205a7ed90e6b864a892
log: fix crash on empty revision with --copies switch

If a revset is empty, .max() raises ValueError.

I don't see any reason to recompute the revs, so I made it reuse the one
returned by logcmdutil.getrevs(). If no revs specified by command line,
the endrev will be smartset.spanset(repo) + 1, which is basically the same
as len(repo), the default of getrenamedfn(). If --follow specified,
revs.max() points to the working parent, which seems more correct.

diff -r 03d7f885d5f2 -r 141017c7f7a9 mercurial/commands.py
--- a/mercurial/commands.py	Tue Apr 17 21:59:58 2018 +0900
+++ b/mercurial/commands.py	Fri Apr 13 23:45:07 2018 +0900
@@ -3477,8 +3477,8 @@
     getrenamed = None
     if opts.get('copies'):
         endrev = None
-        if opts.get('rev'):
-            endrev = scmutil.revrange(repo, opts.get('rev')).max() + 1
+        if revs:
+            endrev = revs.max() + 1
         getrenamed = templatekw.getrenamedfn(repo, endrev=endrev)
 
     ui.pager('log')
diff -r 03d7f885d5f2 -r 141017c7f7a9 tests/test-log.t
--- a/tests/test-log.t	Tue Apr 17 21:59:58 2018 +0900
+++ b/tests/test-log.t	Fri Apr 13 23:45:07 2018 +0900
@@ -656,6 +656,9 @@
   6 
 #endif
 
+log copies, empty set
+
+  $ hg log --copies -r '0 and not 0'
 
 log -p d