view tests/test-log-exthook.t @ 40501:30a7d3b6b281

narrow: rework logic to check whether we need to widen and narrow

This patch reworks logic which calculates whether we need to extend or narrow
our working copy or not.

We filter the addincludes, removeincludes, addexcludes and removeexcludes passed
from user to the actual added and removed includes and excludes. What that means
is a user can pass an already included path as addincludes, a path which is not
included as removeincludes etc. In such situations the old logic use to think we
need to do some work, whereas we don't need to do that work.

In old logic, even if we don't have anything new to include but it believes we
need to call widen, this adds some good amount of work on large repository. A
widen calls involves computing incomming csets, calling the narrow_widen() which
in non-ellipses cases goes through all the set of csets which are available
which can take ~2-3 mins on large repos. Those 2-3 minutes are spend on doing
nothing which a client can prevent by checking is there really anything which
needs to be included.

The tests changes shows that we don't go to the server anymore in such cases
which is nice.

Differential Revision: https://phab.mercurial-scm.org/D5183

Test hg log changeset printer external hook
-------------------------------------------

  $ cat > $TESTTMP/logexthook.py <<EOF
  > from __future__ import absolute_import
  > import codecs
  > from mercurial import (
  >   commands,
  >   logcmdutil,
  >   repair,
  > )
  > def rot13description(self, ctx):
  >     summary = codecs.encode("summary", 'rot-13')
  >     description = ctx.description().strip().splitlines()[0].encode('rot13')
  >     self.ui.write("%s:     %s\n" % (summary, description))
  > def reposetup(ui, repo):
  >     logcmdutil.changesetprinter._exthook = rot13description
  > EOF

Prepare the repository

  $ hg init empty
  $ cd empty
  $ touch ROOT
  $ hg commit -A -m "Root" ROOT

  $ touch a b c
  $ hg commit -A -m "Add A, B, C" a b c

Check the log

  $ hg log --config extensions.t=$TESTTMP/logexthook.py
  changeset:   1:70fc82b23320
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  fhzznel:     Nqq N, O, P
  summary:     Add A, B, C
  
  changeset:   0:b00443a54871
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  fhzznel:     Ebbg
  summary:     Root
  
Check that exthook is working with graph log too

  $ hg log -G --config extensions.t=$TESTTMP/logexthook.py
  @  changeset:   1:70fc82b23320
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  fhzznel:     Nqq N, O, P
  |  summary:     Add A, B, C
  |
  o  changeset:   0:b00443a54871
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     fhzznel:     Ebbg
     summary:     Root