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codemod: simplify nested withs

This is the result of running:

  python codemod_nestedwith.py **/*.py

where codemod_nestedwith.py looks like this:

#!/usr/bin/env python
# codemod_nestedwith.py - codemod tool to rewrite nested with
#
# Copyright 2017 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import, print_function

import sys

import redbaron

def readpath(path):
    with open(path) as f:
        return f.read()

def writepath(path, content):
    with open(path, 'w') as f:
        f.write(content)

def main(argv):
    if not argv:
        print('Usage: codemod_nestedwith.py FILES')

    for i, path in enumerate(argv):
        print('(%d/%d) scanning %s' % (i + 1, len(argv), path))
        changed = False
        red = redbaron.RedBaron(readpath(path))
        processed = set()
        for node in red.find_all('with'):
            if node in processed or node.type != 'with':
                continue
            top = node
            child = top[0]
            while True:
                if len(top) > 1 or child.type != 'with':
                    break
                # estimate line length after merging two "with"s
                new = '%swith %s:' % (top.indentation, top.contexts.dumps())
                new += ', %s' % child.contexts.dumps()
                # only do the rewrite if the end result is within 80 chars
                if len(new) > 80:
                    break
                processed.add(child)
                top.contexts.extend(child.contexts)
                top.value = child.value
                top.value.decrease_indentation(4)
                child = child[0]
                changed = True
        if changed:
            print('updating %s' % path)
            writepath(path, red.dumps())

if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))


Differential Revision: https://phab.mercurial-scm.org/D77

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories

# 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()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)