tests/test-eolfilename.t

wrapfunction: use functools.partial if possible

Every `extensions.bind` call inserts a frame in traceback:

   ... in closure
     return func(*(args + a), **kw)

which makes traceback noisy.

The Python stdlib has a `functools.partial` which is backed by C code and
does not pollute traceback. However it does not support instancemethod and
sets `args` attribute which could be problematic for alias handling.

This patch makes `wrapfunction` use `functools.partial` if we are wrapping a
function directly exported by a module (so it's impossible to be a class or
instance method), and special handles `wrapfunction` results so alias
handling code could handle `args` just fine.

As an example, `hg rebase -s . -d . --traceback` got 6 lines removed in my
setup:

   File "hg/mercurial/dispatch.py", line 898, in _dispatch
     cmdpats, cmdoptions)
  -File "hg/mercurial/extensions.py", line 333, in closure
  -  return func(*(args + a), **kw)
   File "hg/hgext/journal.py", line 84, in runcommand
     return orig(lui, repo, cmd, fullargs, *args)
  -File "hg/mercurial/extensions.py", line 333, in closure
  -  return func(*(args + a), **kw)
   File "fb-hgext/hgext3rd/fbamend/hiddenoverride.py", line 119, in runcommand
     result = orig(lui, repo, cmd, fullargs, *args)
   File "hg/mercurial/dispatch.py", line 660, in runcommand
     ret = _runcommand(ui, options, cmd, d)
  -File "hg/mercurial/extensions.py", line 333, in closure
  -  return func(*(args + a), **kw)
   File "hg/hgext/pager.py", line 69, in pagecmd
     return orig(ui, options, cmd, cmdfunc)
   ....

Differential Revision: https://phab.mercurial-scm.org/D632

#require eol-in-paths

https://bz.mercurial-scm.org/352

test issue352

  $ hg init foo
  $ cd foo
  $ A=`printf 'he\rllo'`
  $ echo foo > "$A"
  $ hg add
  adding he\r (no-eol) (esc)
  llo
  abort: '\n' and '\r' disallowed in filenames: 'he\rllo'
  [255]
  $ hg ci -A -m m
  adding he\r (no-eol) (esc)
  llo
  abort: '\n' and '\r' disallowed in filenames: 'he\rllo'
  [255]
  $ rm "$A"
  $ echo foo > "hell
  > o"
  $ hg add
  adding hell
  o
  abort: '\n' and '\r' disallowed in filenames: 'hell\no'
  [255]
  $ hg ci -A -m m
  adding hell
  o
  abort: '\n' and '\r' disallowed in filenames: 'hell\no'
  [255]
  $ echo foo > "$A"
  $ hg debugwalk
  matcher: <alwaysmatcher>
  f  he\r (no-eol) (esc)
  llo  he\r (no-eol) (esc)
  llo
  f  hell
  o  hell
  o

  $ echo bla > quickfox
  $ hg add quickfox
  $ hg ci -m 2
  $ A=`printf 'quick\rfox'`
  $ hg cp quickfox "$A"
  abort: '\n' and '\r' disallowed in filenames: 'quick\rfox'
  [255]
  $ hg mv quickfox "$A"
  abort: '\n' and '\r' disallowed in filenames: 'quick\rfox'
  [255]

https://bz.mercurial-scm.org/2036

  $ cd ..

test issue2039

  $ hg init bar
  $ cd bar
  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > color =
  > [color]
  > mode = ansi
  > EOF
  $ A=`printf 'foo\nbar'`
  $ B=`printf 'foo\nbar.baz'`
  $ touch "$A"
  $ touch "$B"
  $ hg status --color=always
  \x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mfoo\x1b[0m (esc)
  \x1b[0;35;1;4mbar\x1b[0m (esc)
  \x1b[0;35;1;4m? \x1b[0m\x1b[0;35;1;4mfoo\x1b[0m (esc)
  \x1b[0;35;1;4mbar.baz\x1b[0m (esc)

  $ cd ..