contrib/hgweb.wsgi

crecord: re-enable reviewing a patch before comitting it

The "r" option for this feature was copied into Mercurial from
crecord, but the actual implementation never made it into hg until
now. It's a moderately useful feature that allows the user to edit the
patch in a text editor before comitting it for good.

This requires a test, so we must also enable a corresponding testing
'R' option that skips the confirmation dialogue. In addition, we also
need a help text for the editor when reviewing the final patch.

As for why this is a useful feature if we can already edit hunks in an
editor, I would like to offer the following points:

    * editing hunks does not show the entire patch all at once

      ** furthermore, the hunk "tree" in the TUI has no root that could be
         selected for edition

    * it is helpful to be able to see the entire final patch for
      confirmation

      ** within this view, the unselected hunks are hidden, which is
         visusally cleaner

      ** this works as a final review of the complete result, which is
         a bit more difficult to do conceptually via hunk editing

    * this feature was already in crecord, so it was an oversight to
      not bring it to core

    * it works and is consistent with editing hunks

# An example WSGI for use with mod_wsgi, edit as necessary
# See https://mercurial-scm.org/wiki/modwsgi for more information

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

# enable demandloading to reduce startup time
from mercurial import demandimport; demandimport.enable()

from mercurial.hgweb import hgweb
application = hgweb(config)