# Test the config layer generated by environment variables

from __future__ import absolute_import, print_function

import os

from mercurial import (

    encoding,

    extensions,

    rcutil,

    ui as uimod,

    util,

)

from mercurial.utils import procutil

testtmp = encoding.environ[b'TESTTMP']

# prepare hgrc files

def join(name):

    return os.path.join(testtmp, name)

with open(join(b'sysrc'), 'wb') as f:

    f.write(b'[ui]\neditor=e0\n[pager]\npager=p0\n')

with open(join(b'userrc'), 'wb') as f:

    f.write(b'[ui]\neditor=e1')

# replace rcpath functions so they point to the files above

def systemrcpath():

    return [join(b'sysrc')]

def userrcpath():

    return [join(b'userrc')]

extensions.wrapfunction(rcutil, 'default_rc_resources', lambda orig: [])

rcutil.systemrcpath = systemrcpath

rcutil.userrcpath = userrcpath

# utility to print configs

def printconfigs(env):

    encoding.environ = env

    rcutil._rccomponents = None  # reset cache

    ui = uimod.ui.load()

    for section, name, value in ui.walkconfig():

        source = ui.configsource(section, name)

        procutil.stdout.write(

            b'%s.%s=%s # %s\n' % (section, name, value, util.pconvert(source))

        )

    procutil.stdout.write(b'\n')

# environment variable overrides

printconfigs({})

printconfigs({b'EDITOR': b'e2', b'PAGER': b'p2'})