amend: add config option to update time to current in hg amend (issue5828)

The given config option i.e. `rewrite.update-timestamp` updates date to
current when //True//. However when only date is to be updated to current
with the working directory clean and no other attributes changing then it
does not amend as stated in issue 5828. Further when `--date` flag is specified
along with the new config option then `--date` is given priority over the
config option.

Differential Revision: https://phab.mercurial-scm.org/D5491

mercurial/cmdutil.py

@@ -2443,6 +2443,12 b' def amend(ui, repo, old, extra, pats, op'
         user = opts.get('user') or old.user()
         date = opts.get('date') or old.date()
 
+        if ui.configbool('rewrite', 'update-timestamp'):
+            if opts.get('date'):
+                pass
+            else:
+                date = dateutil.makedate()
+
         # Parse the date to allow comparison between date and old.date()
         date = dateutil.parsedate(date)
 
@@ -2558,12 +2564,14 b' def amend(ui, repo, old, extra, pats, op'
         if ((not changes)
             and newdesc == old.description()
             and user == old.user()
-            and date == old.date()
             and pureextra == old.extra()):
             # nothing changed. continuing here would create a new node
             # anyway because of the amend_source noise.
             #
             # This not what we expect from amend.
+            if (date == old.date() or
+                (ui.configbool('rewrite', 'update-timestamp') and
+                 not opts.get('date'))):
             return old.node()
 
         commitphase = None

mercurial/configitems.py

@@ -991,6 +991,9 b" coreconfigitem('storage', 'mmap-threshol"
     default='1MB',
     alias=[('experimental', 'mmapindexthreshold')],
 )
+coreconfigitem('rewrite', 'update-timestamp',
+    default=False,
+)
 coreconfigitem('storage', 'new-repo-backend',
     default='revlogv1',
 )

mercurial/help/config.txt

@@ -1806,6 +1806,13 b' have a definite end point.'
 
 Alias definitions for revsets. See :hg:`help revsets` for details.
 
+``rewrite``
+-----------
+
+``update-timestamp``
+    If true, updates the date and time of the changeset to current. It is only
+    applicable for hg amend in current version.
+
 ``storage``
 -----------
 

tests/test-amend.t

@@ -365,3 +365,128 b' When history-editing-backup config optio'
   $ hg amend
 
 #endif
+==========================================
+Test update-timestamp config option|
+==========================================
+  $ cat >> testmocks.py << EOF
+  > # mock out util.makedate() to supply testable values
+  > import os
+  > from mercurial import pycompat, util
+  > from mercurial.utils import dateutil
+  > 
+  > def mockmakedate():
+  >     filename = os.path.join(os.environ['TESTTMP'], 'testtime')
+  >     try:
+  >         with open(filename, 'rb') as timef:
+  >             time = float(timef.read()) + 1
+  >     except IOError:
+  >         time = 0.0
+  >     with open(filename, 'wb') as timef:
+  >         timef.write(pycompat.bytestr(time))
+  >     return (time, 0)
+  > 
+  > dateutil.makedate = mockmakedate
+  > EOF
+
+  $ cat >> $HGRCPATH << EOF
+  > [extensions]
+  > amend=
+  > testmocks=`pwd`/testmocks.py
+  > EOF
+
+  $ hg init $TESTTMP/repo5
+  $ cd $TESTTMP/repo5
+  $ echo a>a
+  $ hg ci -Am 'commit 1'
+  adding a
+#if obsstore-on
+
+When updatetimestamp is False
+
+  $ hg amend --date '1997-1-1 0:1'
+  $ hg log --limit 1
+  changeset:   1:036a159be19d
+  tag:         tip
+  parent:      -1:000000000000
+  user:        test
+  date:        Wed Jan 01 00:01:00 1997 +0000
+  summary:     commit 1
+  
+ When update-timestamp is True and no other change than the date
+
+  $ hg amend --config rewrite.update-timestamp=True
+  nothing changed
+  [1]
+  $ hg log --limit 1
+  changeset:   1:036a159be19d
+  tag:         tip
+  parent:      -1:000000000000
+  user:        test
+  date:        Wed Jan 01 00:01:00 1997 +0000
+  summary:     commit 1
+  
+When update-timestamp is True and there is other change than the date
+  $ hg amend --user foobar --config rewrite.update-timestamp=True
+  $ hg log --limit 1
+  changeset:   2:3ba48b892280
+  tag:         tip
+  parent:      -1:000000000000
+  user:        foobar
+  date:        Thu Jan 01 00:00:02 1970 +0000
+  summary:     commit 1
+  
+
+When date option is applicable and update-timestamp is True
+  $ hg amend  --date '1998-1-1 0:1' --config rewrite.update-timestamp=True
+  $ hg log --limit 1
+  changeset:   3:626aee031885
+  tag:         tip
+  parent:      -1:000000000000
+  user:        foobar
+  date:        Thu Jan 01 00:01:00 1998 +0000
+  summary:     commit 1
+  
+#else
+
+When updatetimestamp is False
+
+  $ hg amend --date '1997-1-1 0:1'
+  $ hg log --limit 1
+  changeset:   0:036a159be19d
+  tag:         tip
+  user:        test
+  date:        Wed Jan 01 00:01:00 1997 +0000
+  summary:     commit 1
+  
+ When update-timestamp is True and no other change than the date
+
+  $ hg amend --config rewrite.update-timestamp=True
+  nothing changed
+  [1]
+  $ hg log --limit 1
+  changeset:   0:036a159be19d
+  tag:         tip
+  user:        test
+  date:        Wed Jan 01 00:01:00 1997 +0000
+  summary:     commit 1
+  
+When update-timestamp is True and there is other change than the date
+  $ hg amend --user foobar --config rewrite.update-timestamp=True
+  $ hg log --limit 1
+  changeset:   0:3ba48b892280
+  tag:         tip
+  user:        foobar
+  date:        Thu Jan 01 00:00:02 1970 +0000
+  summary:     commit 1
+  
+
+When date option is applicable and update-timestamp is True
+  $ hg amend  --date '1998-1-1 0:1' --config rewrite.update-timestamp=True
+  $ hg log --limit 1
+  changeset:   0:626aee031885
+  tag:         tip
+  user:        foobar
+  date:        Thu Jan 01 00:01:00 1998 +0000
+  summary:     commit 1
+  
+#endif