view tests/test-eol-tag.t @ 32903:27932a76a88d

dagop: split module hosting DAG-related algorithms from revset

This module hosts the following functions. They are somewhat similar (e.g.
scanning revisions using heap queue or stack) and seem non-trivial in
algorithmic point of view.

 - _revancestors()
 - _revdescendants()
 - reachableroots()
 - _toposort()

I was thinking of adding revset._fileancestors() generator for better follow()
implementation, but it would be called from context.py as well. So I decided
to create new module.

Naming is hard. I couldn't come up with any better module name, so it's called
"dag operation" now. I rejected the following candidates:

 - ancestor.py - existing, revlog-level DAG algorithm
 - ancestorset.py - doesn't always return a set
 - dagalgorithm.py - hard to type
 - dagutil.py - existing
 - revancestor.py - I want to add fileancestors()

  % wc -l mercurial/dagop.py mercurial/revset.py
    339 mercurial/dagop.py
   2020 mercurial/revset.py
   2359 total

https://bz.mercurial-scm.org/2493

Testing tagging with the EOL extension

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > eol =
  > 
  > [eol]
  > native = CRLF
  > EOF

setup repository

  $ hg init repo
  $ cd repo
  $ cat > .hgeol <<EOF
  > [patterns]
  > ** = native
  > EOF
  $ printf "first\r\nsecond\r\nthird\r\n" > a.txt
  $ hg commit --addremove -m 'checkin'
  adding .hgeol
  adding a.txt

Tag:

  $ hg tag 1.0

Rewrite .hgtags file as it would look on a new checkout:

  $ hg update -q null
  $ hg update -q

Touch .hgtags file again:

  $ hg tag 2.0

  $ cd ..