import sys, os, subprocess

if subprocess.call(['python', '%s/hghave' % os.environ['TESTDIR'],

                    'cacheable']):

    sys.exit(80)

from mercurial import util, scmutil, extensions, hg, ui

filecache = scmutil.filecache

class fakerepo(object):

    def __init__(self):

        self._filecache = {}

    def join(self, p):

        return p

    def sjoin(self, p):

        return p

    @filecache('x')

    def cached(self):

        print 'creating'

        return 'string from function'

    def invalidate(self):

        for k in self._filecache:

            try:

                delattr(self, k)

            except AttributeError:

                pass

def basic(repo):

    repo.cached

    repo.invalidate()

    repo.cached

    # create empty file

    f = open('x', 'w')

    f.close()

    repo.invalidate()

    # should recreate the object

    repo.cached

    f = open('x', 'w')

    f.write('a')

    f.close()

    repo.invalidate()

    # should recreate the object

    repo.cached

    repo.invalidate()

    repo.cached

    # atomic replace file, size doesn't change

    # hopefully st_mtime doesn't change as well so this doesn't use the cache

    # because of inode change

    f = scmutil.opener('.')('x', 'w', atomictemp=True)

    f.write('b')

    f.close()

    repo.invalidate()

    repo.cached

def fakeuncacheable():

    def wrapcacheable(orig, *args, **kwargs):

        return False

    def wrapinit(orig, *args, **kwargs):

        pass

    originit = extensions.wrapfunction(util.cachestat, '__init__', wrapinit)

    origcacheable = extensions.wrapfunction(util.cachestat, 'cacheable',

                                            wrapcacheable)

    try:

        os.remove('x')

    except OSError:

        pass

    basic(fakerepo())

    util.cachestat.cacheable = origcacheable

    util.cachestat.__init__ = originit

def test_filecache_synced():

    # test old behaviour that caused filecached properties to go out of sync

    os.system('hg init && echo a >> a && hg ci -qAm.')

    repo = hg.repository(ui.ui())

    # first rollback clears the filecache, but changelog to stays in __dict__

    repo.rollback()

    repo.commit('.')

    # second rollback comes along and touches the changelog externally

    # (file is moved)

    repo.rollback()

    # but since changelog isn't under the filecache control anymore, we don't

    # see that it changed, and return the old changelog without reconstructing

    # it

    repo.commit('.')

def setbeforeget(repo):

    os.remove('x')

    repo.cached = 'string set externally'

    repo.invalidate()

    print repo.cached

    repo.invalidate()

    f = open('x', 'w')

    f.write('a')

    f.close()

    print repo.cached

print 'basic:'

print

basic(fakerepo())

print

print 'fakeuncacheable:'

print

fakeuncacheable()

test_filecache_synced()

print

print 'setbeforeget:'

print

setbeforeget(fakerepo())