# statichttprepo.py - simple http repository class for mercurial

#

# This provides read-only repo access to repositories exported via static http

#

# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

from i18n import _

import changelog, filelog, httprangereader

import repo, localrepo, manifest, os, urllib, urllib2, util

class rangereader(httprangereader.httprangereader):

    def read(self, size=None):

        try:

            return httprangereader.httprangereader.read(self, size)

        except urllib2.HTTPError, inst:

            raise IOError(None, inst)

        except urllib2.URLError, inst:

            raise IOError(None, inst.reason[1])

def opener(base):

    """return a function that opens files over http"""

    p = base

    def o(path, mode="r"):

        f = "/".join((p, urllib.quote(path)))

        return rangereader(f)

    return o

class statichttprepository(localrepo.localrepository):

    def __init__(self, ui, path):

        self._url = path

        self.ui = ui

        self.path = path.rstrip('/') + "/.hg"

        self.opener = opener(self.path)

        # find requirements

        try:

            requirements = self.opener("requires").read().splitlines()

        except IOError:

            requirements = []

        # check them

        for r in requirements:

            if r not in self.supported:

                raise repo.RepoError(_("requirement '%s' not supported") % r)

        # setup store

        if "store" in requirements:

            self.encodefn = util.encodefilename

            self.decodefn = util.decodefilename

            self.spath = self.path + "/store"

        else:

            self.encodefn = lambda x: x

            self.decodefn = lambda x: x

            self.spath = self.path

        self.sopener = util.encodedopener(opener(self.spath), self.encodefn)

        self.manifest = manifest.manifest(self.sopener)

        self.changelog = changelog.changelog(self.sopener)

        self.tagscache = None

        self.nodetagscache = None

        self.encodepats = None

        self.decodepats = None

    def url(self):

        return 'static-' + self._url

    def dev(self):

        return -1

    def local(self):

        return False

def instance(ui, path, create):

    if create:

        raise util.Abort(_('cannot create new static-http repository'))

    return statichttprepository(ui, path[7:])