# HG changeset patch
# User Sushil khanchi <sushilkhanchi97@gmail.com>
# Date 1541861405 -3600
# Node ID df22f010cf2473047a458442404666565bb92717
# Parent  323b3dac5bba6bd6c24c82fb4c1cdb61e80c2f9f
next: make next command --evolve by default

Before this patch, if we need to evolve to update to the next child,
we were suggesting the user to use --evolve flag. This patch make some
changes to evolve by default in that conditions.

After making next command to evolve by default we have to consider
the following points:

1) If we don't need to evolve while updating to the next child:

  a) And if wdir is dirty, we suggest to use --merge flag
  b) if wdir is clean, we simply update to next child (if ambiguous,
     prompt the user to select one)

2) If we need to evolve:

  a) when wdir is dirty, we suggest the user to use `hg shelve` first,
     to make wdir clean. As we don't support --merge while evovling.
  b) when wdir is clean, we evolve the next cset.

Changes made in test-prev-next.t reflect the changed behaviour.

diff -r 323b3dac5bba -r df22f010cf24 hgext3rd/evolve/__init__.py
--- a/hgext3rd/evolve/__init__.py	Sat Nov 10 16:05:34 2018 +0100
+++ b/hgext3rd/evolve/__init__.py	Sat Nov 10 15:50:05 2018 +0100
@@ -1105,7 +1105,7 @@
     [('B', 'move-bookmark', False,
         _('move active bookmark after update')),
      ('m', 'merge', False, _('bring uncommitted change along')),
-     ('', 'evolve', False, _('evolve the next changeset if necessary')),
+     ('', 'evolve', True, _('evolve the next changeset if necessary')),
      ('', 'no-topic', False, _('ignore topic and move topologically')),
      ('n', 'dry-run', False,
       _('do not perform actions, just print what would be done'))],
@@ -1128,11 +1128,6 @@
         if len(wparents) != 1:
             raise error.Abort(_('merge in progress'))
 
-        # check for dirty wdir if --evolve is passed
-        if opts['evolve']:
-            hint = _('use `hg amend`, `hg revert` or `hg shelve`')
-            cmdutil.bailifchanged(repo, hint=hint)
-
         children = [ctx for ctx in wparents[0].children() if not ctx.obsolete()]
         topic = _getcurrenttopic(repo)
         filtered = set()
@@ -1144,13 +1139,21 @@
         displayer = compat.changesetdisplayer(ui, repo, {'template': template})
 
         # check if we need to evolve while updating to the next child revision
+        needevolve = False
         aspchildren = evolvecmd._aspiringchildren(repo, [repo['.'].rev()])
         if topic:
             filtered.update(repo[c] for c in aspchildren
                             if repo[c].topic() != topic)
             aspchildren = [ctx for ctx in aspchildren if ctx not in filtered]
+        if aspchildren:
+            needevolve = True
 
-        if not opts['merge']:
+        # check if working directory is clean before we evolve the next cset
+        if needevolve:
+            hint = _('use `hg amend`, `hg revert` or `hg shelve`')
+            cmdutil.bailifchanged(repo, hint=hint)
+
+        if not opts['merge'] and not needevolve:
             # we only skip the check if noconflict is set
             if ui.config('commands', 'update.check') == 'noconflict':
                 pass
@@ -1173,16 +1176,12 @@
             else:
                 return _updatetonext(ui, repo, repo[choosedrev], displayer, opts)
         else:
-            if not opts['evolve'] or not aspchildren:
+            if not aspchildren:
                 if filtered:
                     ui.warn(_('no children on topic "%s"\n') % topic)
                     ui.warn(_('do you want --no-topic\n'))
                 else:
                     ui.warn(_('no children\n'))
-                if aspchildren:
-                    msg = _('(%i unstable changesets to be evolved here, '
-                            'do you want --evolve?)\n')
-                    ui.warn(msg % len(aspchildren))
                 return 1
             elif 1 < len(aspchildren):
                 cheader = _("ambiguous next (unstable) changeset, choose one to"