def changeset(web, req, tmpl):
    ctx = webutil.changectx(web.repo, req)
    showtags = webutil.showtag(web.repo, tmpl, 'changesettag', ctx.node())
    showbranch = webutil.nodebranchnodefault(ctx)

    files = []
    parity = paritygen(web.stripecount)
    for f in ctx.files():
        template = f in ctx and 'filenodelink' or 'filenolink'
        files.append(tmpl(template,
                          node=ctx.hex(), file=f,
                          parity=parity.next()))

    parity = paritygen(web.stripecount)
    diffs = webutil.diffs(web.repo, tmpl, ctx, None, parity)
    return tmpl('changeset',
                diff=diffs,
                rev=ctx.rev(),
                node=ctx.hex(),
                parent=webutil.parents(ctx),
                child=webutil.children(ctx),
                changesettag=showtags,
                changesetbranch=showbranch,
                author=ctx.user(),
                desc=ctx.description(),
                date=ctx.date(),
                files=files,
                archives=web.archivelist(ctx.hex()),
                tags=webutil.nodetagsdict(web.repo, ctx.node()),
                branch=webutil.nodebranchnodefault(ctx),
                inbranch=webutil.nodeinbranch(web.repo, ctx),
                branches=webutil.nodebranchdict(web.repo, ctx))

def changelog(web, req, tmpl, shortlog = False):
    if 'node' in req.form:
        ctx = webutil.changectx(web.repo, req)
    else:
        if 'rev' in req.form:
            hi = req.form['rev'][0]
        else:
            hi = len(web.repo) - 1
        try:
            ctx = web.repo[hi]
        except error.RepoError:
            return _search(web, tmpl, hi) # XXX redirect to 404 page?

    def changelist(limit=0, **map):
        l = [] # build a list in forward order for efficiency
        for i in xrange(start, end):
            ctx = web.repo[i]
            n = ctx.node()
            showtags = webutil.showtag(web.repo, tmpl, 'changelogtag', n)
            files = webutil.listfilediffs(tmpl, ctx.files(), n, web.maxfiles)

            l.insert(0, {"parity": parity.next(),
                         "author": ctx.user(),
                         "parent": webutil.parents(ctx, i - 1),
                         "child": webutil.children(ctx, i + 1),
                         "changelogtag": showtags,
                         "desc": ctx.description(),
                         "date": ctx.date(),
                         "files": files,
                         "rev": i,
                         "node": hex(n),
                         "tags": webutil.nodetagsdict(web.repo, n),
                         "inbranch": webutil.nodeinbranch(web.repo, ctx),
                         "branches": webutil.nodebranchdict(web.repo, ctx)
                        })

        if limit > 0:
            l = l[:limit]

        for e in l:
            yield e

    maxchanges = shortlog and web.maxshortchanges or web.maxchanges
    cl = web.repo.changelog
    count = len(cl)
    pos = ctx.rev()
    start = max(0, pos - maxchanges + 1)
    end = min(count, start + maxchanges)
    pos = end - 1
    parity = paritygen(web.stripecount, offset=start-end)

    changenav = webutil.revnavgen(pos, maxchanges, count, web.repo.changectx)

    return tmpl(shortlog and 'shortlog' or 'changelog',
                changenav=changenav,
                node=hex(ctx.node()),
                rev=pos, changesets=count,
                entries=lambda **x: changelist(limit=0,**x),
                latestentry=lambda **x: changelist(limit=1,**x),
                archives=web.archivelist("tip"))

def filediff(web, req, tmpl):
    fctx, ctx = None, None
    try:
        fctx = webutil.filectx(web.repo, req)
    except LookupError:
        ctx = webutil.changectx(web.repo, req)
        path = webutil.cleanpath(web.repo, req.form['file'][0])
        if path not in ctx.files():
            raise

    if fctx is not None:
        n = fctx.node()
        path = fctx.path()
    else:
        n = ctx.node()
        # path already defined in except clause

    parity = paritygen(web.stripecount)
    diffs = webutil.diffs(web.repo, tmpl, fctx or ctx, [path], parity)
    rename = fctx and webutil.renamelink(fctx) or []
    ctx = fctx and fctx or ctx
    return tmpl("filediff",
                file=path,
                node=hex(n),
                rev=ctx.rev(),
                date=ctx.date(),
                desc=ctx.description(),
                author=ctx.user(),
                rename=rename,
                branch=webutil.nodebranchnodefault(ctx),
                parent=webutil.parents(ctx),
                child=webutil.children(ctx),
                diff=diffs)

def filelog(web, req, tmpl):

    try:
        fctx = webutil.filectx(web.repo, req)
        f = fctx.path()
        fl = fctx.filelog()
    except error.LookupError:
        f = webutil.cleanpath(web.repo, req.form['file'][0])
        fl = web.repo.file(f)
        numrevs = len(fl)
        if not numrevs: # file doesn't exist at all
            raise
        rev = webutil.changectx(web.repo, req).rev()
        first = fl.linkrev(0)
        if rev < first: # current rev is from before file existed
            raise
        frev = numrevs - 1
        while fl.linkrev(frev) > rev:
            frev -= 1
        fctx = web.repo.filectx(f, fl.linkrev(frev))

    count = fctx.filerev() + 1
    pagelen = web.maxshortchanges
    start = max(0, fctx.filerev() - pagelen + 1) # first rev on this page
    end = min(count, start + pagelen) # last rev on this page
    parity = paritygen(web.stripecount, offset=start-end)

    def entries(limit=0, **map):
        l = []

        repo = web.repo
        for i in xrange(start, end):
            iterfctx = fctx.filectx(i)

            l.insert(0, {"parity": parity.next(),
                         "filerev": i,
                         "file": f,
                         "node": hex(iterfctx.node()),
                         "author": iterfctx.user(),
                         "date": iterfctx.date(),
                         "rename": webutil.renamelink(iterfctx),
                         "parent": webutil.parents(iterfctx),
                         "child": webutil.children(iterfctx),
                         "desc": iterfctx.description(),
                         "tags": webutil.nodetagsdict(repo, iterfctx.node()),
                         "branch": webutil.nodebranchnodefault(iterfctx),
                         "inbranch": webutil.nodeinbranch(repo, iterfctx),
                         "branches": webutil.nodebranchdict(repo, iterfctx)})

        if limit > 0:
            l = l[:limit]

        for e in l:
            yield e

    nodefunc = lambda x: fctx.filectx(fileid=x)
    nav = webutil.revnavgen(end - 1, pagelen, count, nodefunc)
    return tmpl("filelog", file=f, node=hex(fctx.node()), nav=nav,
                entries=lambda **x: entries(limit=0, **x),
                latestentry=lambda **x: entries(limit=1, **x))

def changelog(web, req, tmpl, shortlog=False):

    query = ''
    if 'node' in req.form:
        ctx = webutil.changectx(web.repo, req)
    elif 'rev' in req.form:
        return _search(web, req, tmpl)
    else:
        ctx = web.repo['tip']

    def changelist():
        revs = []
        if pos != -1:
            revs = web.repo.changelog.revs(pos, 0)
        curcount = 0
        for rev in revs:
            curcount += 1
            if curcount > revcount + 1:
                break

            entry = webutil.changelistentry(web, web.repo[rev], tmpl)
            entry['parity'] = parity.next()
            yield entry

    revcount = shortlog and web.maxshortchanges or web.maxchanges
    if 'revcount' in req.form:
        try:
            revcount = int(req.form.get('revcount', [revcount])[0])
            revcount = max(revcount, 1)
            tmpl.defaults['sessionvars']['revcount'] = revcount
        except ValueError:
            pass

    lessvars = copy.copy(tmpl.defaults['sessionvars'])
    lessvars['revcount'] = max(revcount / 2, 1)
    morevars = copy.copy(tmpl.defaults['sessionvars'])
    morevars['revcount'] = revcount * 2

    count = len(web.repo)
    pos = ctx.rev()
    parity = paritygen(web.stripecount)

    changenav = webutil.revnav(web.repo).gen(pos, revcount, count)

    entries = list(changelist())
    latestentry = entries[:1]
    if len(entries) > revcount:
        nextentry = entries[-1:]
        entries = entries[:-1]
    else:
        nextentry = []

    return tmpl(shortlog and 'shortlog' or 'changelog', changenav=changenav,
                node=ctx.hex(), rev=pos, changesets=count,
                entries=entries,
                latestentry=latestentry, nextentry=nextentry,
                archives=web.archivelist("tip"), revcount=revcount,
                morevars=morevars, lessvars=lessvars, query=query)

def graph(web, req, tmpl):

    rev = webutil.changectx(web.repo, req).rev()
    bg_height = 39
    revcount = web.maxshortchanges
    if "revcount" in req.form:
        revcount = int(req.form.get("revcount", [revcount])[0])
        revcount = max(revcount, 1)
        tmpl.defaults["sessionvars"]["revcount"] = revcount

    lessvars = copy.copy(tmpl.defaults["sessionvars"])
    lessvars["revcount"] = max(revcount / 2, 1)
    morevars = copy.copy(tmpl.defaults["sessionvars"])
    morevars["revcount"] = revcount * 2

    max_rev = len(web.repo) - 1
    revcount = min(max_rev, revcount)
    revnode = web.repo.changelog.node(rev)
    revnode_hex = hex(revnode)
    uprev = min(max_rev, rev + revcount)
    downrev = max(0, rev - revcount)
    count = len(web.repo)
    changenav = webutil.revnavgen(rev, revcount, count, web.repo.changectx)
    startrev = rev
    # if starting revision is less than 60 set it to uprev
    if rev < web.maxshortchanges:
        startrev = uprev

    dag = graphmod.dagwalker(web.repo, range(startrev, downrev - 1, -1))
    tree = list(graphmod.colored(dag, web.repo))
    canvasheight = (len(tree) + 1) * bg_height - 27
    data = []
    for (id, type, ctx, vtx, edges) in tree:
        if type != graphmod.CHANGESET:
            continue
        node = str(ctx)
        age = templatefilters.age(ctx.date())
        desc = templatefilters.firstline(ctx.description())
        desc = cgi.escape(templatefilters.nonempty(desc))
        user = cgi.escape(templatefilters.person(ctx.user()))
        branch = ctx.branch()
        branch = branch, web.repo.branchtags().get(branch) == ctx.node()
        data.append((node, vtx, edges, desc, user, age, branch, ctx.tags(), ctx.bookmarks()))

    return tmpl(
        "graph",
        rev=rev,
        revcount=revcount,
        uprev=uprev,
        lessvars=lessvars,
        morevars=morevars,
        downrev=downrev,
        canvasheight=canvasheight,
        jsdata=data,
        bg_height=bg_height,
        node=revnode_hex,
        changenav=changenav,
    )

def comparison(web, req, tmpl):
    ctx = webutil.changectx(web.repo, req)
    if 'file' not in req.form:
        raise ErrorResponse(HTTP_NOT_FOUND, 'file not given')
    path = webutil.cleanpath(web.repo, req.form['file'][0])
    rename = path in ctx and webutil.renamelink(ctx[path]) or []

    parsecontext = lambda v: v == 'full' and -1 or int(v)
    if 'context' in req.form:
        context = parsecontext(req.form['context'][0])
    else:
        context = parsecontext(web.config('web', 'comparisoncontext', '5'))

    def filelines(f):
        if util.binary(f.data()):
            mt = mimetypes.guess_type(f.path())[0]
            if not mt:
                mt = 'application/octet-stream'
            return [_('(binary file %s, hash: %s)') % (mt, hex(f.filenode()))]
        return f.data().splitlines()

    parent = ctx.p1()
    leftrev = parent.rev()
    leftnode = parent.node()
    rightrev = ctx.rev()
    rightnode = ctx.node()
    if path in ctx:
        fctx = ctx[path]
        rightlines = filelines(fctx)
        if path not in parent:
            leftlines = ()
        else:
            pfctx = parent[path]
            leftlines = filelines(pfctx)
    else:
        rightlines = ()
        fctx = ctx.parents()[0][path]
        leftlines = filelines(fctx)

    comparison = webutil.compare(tmpl, context, leftlines, rightlines)
    return tmpl('filecomparison',
                file=path,
                node=hex(ctx.node()),
                rev=ctx.rev(),
                date=ctx.date(),
                desc=ctx.description(),
                extra=ctx.extra(),
                author=ctx.user(),
                rename=rename,
                branch=webutil.nodebranchnodefault(ctx),
                parent=webutil.parents(fctx),
                child=webutil.children(fctx),
                leftrev=leftrev,
                leftnode=hex(leftnode),
                rightrev=rightrev,
                rightnode=hex(rightnode),
                comparison=comparison)

def filediff(web, req, tmpl):
    """
    /diff/{revision}/{path}
    -----------------------

    Show how a file changed in a particular commit.

    The ``filediff`` template is rendered.

    This hander is registered under both the ``/diff`` and ``/filediff``
    paths. ``/diff`` is used in modern code.
    """
    fctx, ctx = None, None
    try:
        fctx = webutil.filectx(web.repo, req)
    except LookupError:
        ctx = webutil.changectx(web.repo, req)
        path = webutil.cleanpath(web.repo, req.form['file'][0])
        if path not in ctx.files():
            raise

    if fctx is not None:
        n = fctx.node()
        path = fctx.path()
        ctx = fctx.changectx()
    else:
        n = ctx.node()
        # path already defined in except clause

    parity = paritygen(web.stripecount)
    style = web.config('web', 'style', 'paper')
    if 'style' in req.form:
        style = req.form['style'][0]

    diffs = webutil.diffs(web.repo, tmpl, ctx, None, [path], parity, style)
    if fctx:
        rename = webutil.renamelink(fctx)
        ctx = fctx
    else:
        rename = []
        ctx = ctx
    return tmpl("filediff",
                file=path,
                node=hex(n),
                rev=ctx.rev(),
                symrev=webutil.symrevorshortnode(req, ctx),
                date=ctx.date(),
                desc=ctx.description(),
                extra=ctx.extra(),
                author=ctx.user(),
                rename=rename,
                branch=webutil.nodebranchnodefault(ctx),
                parent=webutil.parents(ctx),
                child=webutil.children(ctx),
                tags=webutil.nodetagsdict(web.repo, n),
                bookmarks=webutil.nodebookmarksdict(web.repo, n),
                diff=diffs)

def changeset(web, req, tmpl):
    ctx = webutil.changectx(web.repo, req)
    basectx = webutil.basechangectx(web.repo, req)
    if basectx is None:
        basectx = ctx.p1()
    showtags = webutil.showtag(web.repo, tmpl, 'changesettag', ctx.node())
    showbookmarks = webutil.showbookmark(web.repo, tmpl, 'changesetbookmark',
                                         ctx.node())
    showbranch = webutil.nodebranchnodefault(ctx)

    files = []
    parity = paritygen(web.stripecount)
    for blockno, f in enumerate(ctx.files()):
        template = f in ctx and 'filenodelink' or 'filenolink'
        files.append(tmpl(template,
                          node=ctx.hex(), file=f, blockno=blockno + 1,
                          parity=parity.next()))

    style = web.config('web', 'style', 'paper')
    if 'style' in req.form:
        style = req.form['style'][0]

    parity = paritygen(web.stripecount)
    diffs = webutil.diffs(web.repo, tmpl, ctx, basectx, None, parity, style)

    parity = paritygen(web.stripecount)
    diffstatgen = webutil.diffstatgen(ctx, basectx)
    diffstat = webutil.diffstat(tmpl, ctx, diffstatgen, parity)

    return tmpl('changeset',
                diff=diffs,
                rev=ctx.rev(),
                node=ctx.hex(),
                parent=webutil.parents(ctx),
                child=webutil.children(ctx),
                basenode=basectx.hex(),
                changesettag=showtags,
                changesetbookmark=showbookmarks,
                changesetbranch=showbranch,
                author=ctx.user(),
                desc=ctx.description(),
                extra=ctx.extra(),
                date=ctx.date(),
                files=files,
                diffsummary=lambda **x: webutil.diffsummary(diffstatgen),
                diffstat=diffstat,
                archives=web.archivelist(ctx.hex()),
                tags=webutil.nodetagsdict(web.repo, ctx.node()),
                bookmarks=webutil.nodebookmarksdict(web.repo, ctx.node()),
                branch=webutil.nodebranchnodefault(ctx),
                inbranch=webutil.nodeinbranch(web.repo, ctx),
                branches=webutil.nodebranchdict(web.repo, ctx))

def archive(web, req, tmpl):
    type_ = req.form.get('type', [None])[0]
    allowed = web.configlist("web", "allow_archive")
    key = req.form['node'][0]

    if type_ not in web.archives:
        msg = 'Unsupported archive type: %s' % type_
        raise ErrorResponse(HTTP_NOT_FOUND, msg)

    if not ((type_ in allowed or
        web.configbool("web", "allow" + type_, False))):
        msg = 'Archive type not allowed: %s' % type_
        raise ErrorResponse(HTTP_FORBIDDEN, msg)

    reponame = re.sub(r"\W+", "-", os.path.basename(web.reponame))
    cnode = web.repo.lookup(key)
    arch_version = key
    if cnode == key or key == 'tip':
        arch_version = short(cnode)
    name = "%s-%s" % (reponame, arch_version)

    ctx = webutil.changectx(web.repo, req)
    pats = []
    matchfn = None
    file = req.form.get('file', None)
    if file:
        pats = ['path:' + file[0]]
        matchfn = scmutil.match(ctx, pats, default='path')
        if pats:
            files = [f for f in ctx.manifest().keys() if matchfn(f)]
            if not files:
                raise ErrorResponse(HTTP_NOT_FOUND,
                    'file(s) not found: %s' % file[0])

    mimetype, artype, extension, encoding = web.archive_specs[type_]
    headers = [
        ('Content-Disposition', 'attachment; filename=%s%s' % (name, extension))
        ]
    if encoding:
        headers.append(('Content-Encoding', encoding))
    req.headers.extend(headers)
    req.respond(HTTP_OK, mimetype)

    archival.archive(web.repo, req, cnode, artype, prefix=name,
                     matchfn=matchfn,
                     subrepos=web.configbool("web", "archivesubrepos"))
    return []

def changeset(web, req, tmpl):
    ctx = webutil.changectx(web.repo, req)
    showtags = webutil.showtag(web.repo, tmpl, "changesettag", ctx.node())
    showbookmarks = webutil.showbookmark(web.repo, tmpl, "changesetbookmark", ctx.node())
    showbranch = webutil.nodebranchnodefault(ctx)

    files = []
    parity = paritygen(web.stripecount)
    for blockno, f in enumerate(ctx.files()):
        template = f in ctx and "filenodelink" or "filenolink"
        files.append(tmpl(template, node=ctx.hex(), file=f, blockno=blockno + 1, parity=parity.next()))

    style = web.config("web", "style", "paper")
    if "style" in req.form:
        style = req.form["style"][0]

    parity = paritygen(web.stripecount)
    diffs = webutil.diffs(web.repo, tmpl, ctx, None, parity, style)

    parity = paritygen(web.stripecount)
    diffstatgen = webutil.diffstatgen(ctx)
    diffstat = webutil.diffstat(tmpl, ctx, diffstatgen, parity)

    return tmpl(
        "changeset",
        diff=diffs,
        rev=ctx.rev(),
        node=ctx.hex(),
        parent=webutil.parents(ctx),
        child=webutil.children(ctx),
        changesettag=showtags,
        changesetbookmark=showbookmarks,
        changesetbranch=showbranch,
        author=ctx.user(),
        desc=ctx.description(),
        date=ctx.date(),
        files=files,
        diffsummary=lambda **x: webutil.diffsummary(diffstatgen),
        diffstat=diffstat,
        archives=web.archivelist(ctx.hex()),
        tags=webutil.nodetagsdict(web.repo, ctx.node()),
        bookmarks=webutil.nodebookmarksdict(web.repo, ctx.node()),
        branch=webutil.nodebranchnodefault(ctx),
        inbranch=webutil.nodeinbranch(web.repo, ctx),
        branches=webutil.nodebranchdict(web.repo, ctx),
    )

def changeset(web, req, tmpl):
    """
    /changeset[/{revision}]
    -----------------------

    Show information about a single changeset.

    A URL path argument is the changeset identifier to show. See ``hg help
    revisions`` for possible values. If not defined, the ``tip`` changeset
    will be shown.

    The ``changeset`` template is rendered. Contents of the ``changesettag``,
    ``changesetbookmark``, ``filenodelink``, ``filenolink``, and the many
    templates related to diffs may all be used to produce the output.
    """
    ctx = webutil.changectx(web.repo, req)

    return tmpl('changeset', **webutil.changesetentry(web, req, tmpl, ctx))

def graph(web, req, tmpl):
    rev = webutil.changectx(web.repo, req).rev()
    bg_height = 39

    revcount = 25
    if 'revcount' in req.form:
        revcount = int(req.form.get('revcount', [revcount])[0])
        tmpl.defaults['sessionvars']['revcount'] = revcount

    lessvars = copy.copy(tmpl.defaults['sessionvars'])
    lessvars['revcount'] = revcount / 2
    morevars = copy.copy(tmpl.defaults['sessionvars'])
    morevars['revcount'] = revcount * 2

    max_rev = len(web.repo) - 1
    revcount = min(max_rev, revcount)
    revnode = web.repo.changelog.node(rev)
    revnode_hex = hex(revnode)
    uprev = min(max_rev, rev + revcount)
    downrev = max(0, rev - revcount)
    count = len(web.repo)
    changenav = webutil.revnavgen(rev, revcount, count, web.repo.changectx)

    dag = graphmod.revisions(web.repo, rev, downrev)
    tree = list(graphmod.colored(dag))
    canvasheight = (len(tree) + 1) * bg_height - 27;
    data = []
    for (id, type, ctx, vtx, edges) in tree:
        if type != graphmod.CHANGESET:
            continue
        node = short(ctx.node())
        age = templatefilters.age(ctx.date())
        desc = templatefilters.firstline(ctx.description())
        desc = cgi.escape(templatefilters.nonempty(desc))
        user = cgi.escape(templatefilters.person(ctx.user()))
        branch = ctx.branch()
        branch = branch, web.repo.branchtags().get(branch) == ctx.node()
        data.append((node, vtx, edges, desc, user, age, branch, ctx.tags()))

    return tmpl('graph', rev=rev, revcount=revcount, uprev=uprev,
                lessvars=lessvars, morevars=morevars, downrev=downrev,
                canvasheight=canvasheight, jsdata=data, bg_height=bg_height,
                node=revnode_hex, changenav=changenav)

def archive(web, req, tmpl):
    """
    /archive/{revision}.{format}[/{path}]
    -------------------------------------

    Obtain an archive of repository content.

    The content and type of the archive is defined by a URL path parameter.
    ``format`` is the file extension of the archive type to be generated. e.g.
    ``zip`` or ``tar.bz2``. Not all archive types may be allowed by your
    server configuration.

    The optional ``path`` URL parameter controls content to include in the
    archive. If omitted, every file in the specified revision is present in the
    archive. If included, only the specified file or contents of the specified
    directory will be included in the archive.

    No template is used for this handler. Raw, binary content is generated.
    """

    type_ = req.form.get('type', [None])[0]
    allowed = web.configlist("web", "allow_archive")
    key = req.form['node'][0]

    if type_ not in web.archives:
        msg = 'Unsupported archive type: %s' % type_
        raise ErrorResponse(HTTP_NOT_FOUND, msg)

    if not ((type_ in allowed or
        web.configbool("web", "allow" + type_, False))):
        msg = 'Archive type not allowed: %s' % type_
        raise ErrorResponse(HTTP_FORBIDDEN, msg)

    reponame = re.sub(r"\W+", "-", os.path.basename(web.reponame))
    cnode = web.repo.lookup(key)
    arch_version = key
    if cnode == key or key == 'tip':
        arch_version = short(cnode)
    name = "%s-%s" % (reponame, arch_version)

    ctx = webutil.changectx(web.repo, req)
    pats = []
    matchfn = scmutil.match(ctx, [])
    file = req.form.get('file', None)
    if file:
        pats = ['path:' + file[0]]
        matchfn = scmutil.match(ctx, pats, default='path')
        if pats:
            files = [f for f in ctx.manifest().keys() if matchfn(f)]
            if not files:
                raise ErrorResponse(HTTP_NOT_FOUND,
                    'file(s) not found: %s' % file[0])

    mimetype, artype, extension, encoding = web.archive_specs[type_]
    headers = [
        ('Content-Disposition', 'attachment; filename=%s%s' % (name, extension))
        ]
    if encoding:
        headers.append(('Content-Encoding', encoding))
    req.headers.extend(headers)
    req.respond(HTTP_OK, mimetype)

    archival.archive(web.repo, req, cnode, artype, prefix=name,
                     matchfn=matchfn,
                     subrepos=web.configbool("web", "archivesubrepos"))
    return []

def comparison(web, req, tmpl):
    ctx = webutil.changectx(web.repo, req)
    if "file" not in req.form:
        raise ErrorResponse(HTTP_NOT_FOUND, "file not given")
    path = webutil.cleanpath(web.repo, req.form["file"][0])
    rename = path in ctx and webutil.renamelink(ctx[path]) or []

    parsecontext = lambda v: v == "full" and -1 or int(v)
    if "context" in req.form:
        context = parsecontext(req.form["context"][0])
    else:
        context = parsecontext(web.config("web", "comparisoncontext", "5"))

    def filelines(f):
        if binary(f.data()):
            mt = mimetypes.guess_type(f.path())[0]
            if not mt:
                mt = "application/octet-stream"
            return [_("(binary file %s, hash: %s)") % (mt, hex(f.filenode()))]
        return f.data().splitlines()

    if path in ctx:
        fctx = ctx[path]
        rightrev = fctx.filerev()
        rightnode = fctx.filenode()
        rightlines = filelines(fctx)
        parents = fctx.parents()
        if not parents:
            leftrev = -1
            leftnode = nullid
            leftlines = ()
        else:
            pfctx = parents[0]
            leftrev = pfctx.filerev()
            leftnode = pfctx.filenode()
            leftlines = filelines(pfctx)
    else:
        rightrev = -1
        rightnode = nullid
        rightlines = ()
        fctx = ctx.parents()[0][path]
        leftrev = fctx.filerev()
        leftnode = fctx.filenode()
        leftlines = filelines(fctx)

    comparison = webutil.compare(tmpl, context, leftlines, rightlines)
    return tmpl(
        "filecomparison",
        file=path,
        node=hex(ctx.node()),
        rev=ctx.rev(),
        date=ctx.date(),
        desc=ctx.description(),
        extra=ctx.extra(),
        author=ctx.user(),
        rename=rename,
        branch=webutil.nodebranchnodefault(ctx),
        parent=webutil.parents(fctx),
        child=webutil.children(fctx),
        leftrev=leftrev,
        leftnode=hex(leftnode),
        rightrev=rightrev,
        rightnode=hex(rightnode),
        comparison=comparison,
    )

def manifest(web, req, tmpl):
    ctx = webutil.changectx(web.repo, req)
    path = webutil.cleanpath(web.repo, req.form.get('file', [''])[0])
    mf = ctx.manifest()
    node = ctx.node()

    files = {}
    dirs = {}
    parity = paritygen(web.stripecount)

    if path and path[-1] != "/":
        path += "/"
    l = len(path)
    abspath = "/" + path

    for f, n in mf.iteritems():
        if f[:l] != path:
            continue
        remain = f[l:]
        elements = remain.split('/')
        if len(elements) == 1:
            files[remain] = f
        else:
            h = dirs # need to retain ref to dirs (root)
            for elem in elements[0:-1]:
                if elem not in h:
                    h[elem] = {}
                h = h[elem]
                if len(h) > 1:
                    break
            h[None] = None # denotes files present

    if mf and not files and not dirs:
        raise ErrorResponse(HTTP_NOT_FOUND, 'path not found: ' + path)

    def filelist(**map):
        for f in sorted(files):
            full = files[f]

            fctx = ctx.filectx(full)
            yield {"file": full,
                   "parity": parity.next(),
                   "basename": f,
                   "date": fctx.date(),
                   "size": fctx.size(),
                   "permissions": mf.flags(full)}

    def dirlist(**map):
        for d in sorted(dirs):

            emptydirs = []
            h = dirs[d]
            while isinstance(h, dict) and len(h) == 1:
                k,v = h.items()[0]
                if v:
                    emptydirs.append(k)
                h = v

            path = "%s%s" % (abspath, d)
            yield {"parity": parity.next(),
                   "path": path,
                   "emptydirs": "/".join(emptydirs),
                   "basename": d}

    return tmpl("manifest",
                rev=ctx.rev(),
                node=hex(node),
                path=abspath,
                up=webutil.up(abspath),
                upparity=parity.next(),
                fentries=filelist,
                dentries=dirlist,
                archives=web.archivelist(hex(node)),
                tags=webutil.nodetagsdict(web.repo, node),
                inbranch=webutil.nodeinbranch(web.repo, ctx),
                branches=webutil.nodebranchdict(web.repo, ctx))

def changelog(web, req, tmpl, shortlog=False):
    """
    /changelog[/{revision}]
    -----------------------

    Show information about multiple changesets.

    If the optional ``revision`` URL argument is absent, information about
    all changesets starting at ``tip`` will be rendered. If the ``revision``
    argument is present, changesets will be shown starting from the specified
    revision.

    If ``revision`` is absent, the ``rev`` query string argument may be
    defined. This will perform a search for changesets.

    The argument for ``rev`` can be a single revision, a revision set,
    or a literal keyword to search for in changeset data (equivalent to
    :hg:`log -k`).

    The ``revcount`` query string argument defines the maximum numbers of
    changesets to render.

    For non-searches, the ``changelog`` template will be rendered.
    """

    query = ''
    if 'node' in req.form:
        ctx = webutil.changectx(web.repo, req)
    elif 'rev' in req.form:
        return _search(web, req, tmpl)
    else:
        ctx = web.repo['tip']

    def changelist():
        revs = []
        if pos != -1:
            revs = web.repo.changelog.revs(pos, 0)
        curcount = 0
        for rev in revs:
            curcount += 1
            if curcount > revcount + 1:
                break

            entry = webutil.changelistentry(web, web.repo[rev], tmpl)
            entry['parity'] = parity.next()
            yield entry

    if shortlog:
        revcount = web.maxshortchanges
    else:
        revcount = web.maxchanges

    if 'revcount' in req.form:
        try:
            revcount = int(req.form.get('revcount', [revcount])[0])
            revcount = max(revcount, 1)
            tmpl.defaults['sessionvars']['revcount'] = revcount
        except ValueError:
            pass

    lessvars = copy.copy(tmpl.defaults['sessionvars'])
    lessvars['revcount'] = max(revcount / 2, 1)
    morevars = copy.copy(tmpl.defaults['sessionvars'])
    morevars['revcount'] = revcount * 2

    count = len(web.repo)
    pos = ctx.rev()
    parity = paritygen(web.stripecount)

    changenav = webutil.revnav(web.repo).gen(pos, revcount, count)

    entries = list(changelist())
    latestentry = entries[:1]
    if len(entries) > revcount:
        nextentry = entries[-1:]
        entries = entries[:-1]
    else:
        nextentry = []

    return tmpl(shortlog and 'shortlog' or 'changelog', changenav=changenav,
                node=ctx.hex(), rev=pos, changesets=count,
                entries=entries,
                latestentry=latestentry, nextentry=nextentry,
                archives=web.archivelist("tip"), revcount=revcount,
                morevars=morevars, lessvars=lessvars, query=query)

def comparison(web, req, tmpl):
    """
    /comparison/{revision}/{path}
    -----------------------------

    Show a comparison between the old and new versions of a file from changes
    made on a particular revision.

    This is similar to the ``diff`` handler. However, this form features
    a split or side-by-side diff rather than a unified diff.

    The ``context`` query string argument can be used to control the lines of
    context in the diff.

    The ``filecomparison`` template is rendered.
    """
    ctx = webutil.changectx(web.repo, req)
    if 'file' not in req.form:
        raise ErrorResponse(HTTP_NOT_FOUND, 'file not given')
    path = webutil.cleanpath(web.repo, req.form['file'][0])
    rename = path in ctx and webutil.renamelink(ctx[path]) or []

    parsecontext = lambda v: v == 'full' and -1 or int(v)
    if 'context' in req.form:
        context = parsecontext(req.form['context'][0])
    else:
        context = parsecontext(web.config('web', 'comparisoncontext', '5'))

    def filelines(f):
        if util.binary(f.data()):
            mt = mimetypes.guess_type(f.path())[0]
            if not mt:
                mt = 'application/octet-stream'
            return [_('(binary file %s, hash: %s)') % (mt, hex(f.filenode()))]
        return f.data().splitlines()

    parent = ctx.p1()
    leftrev = parent.rev()
    leftnode = parent.node()
    rightrev = ctx.rev()
    rightnode = ctx.node()
    if path in ctx:
        fctx = ctx[path]
        rightlines = filelines(fctx)
        if path not in parent:
            leftlines = ()
        else:
            pfctx = parent[path]
            leftlines = filelines(pfctx)
    else:
        rightlines = ()
        fctx = ctx.parents()[0][path]
        leftlines = filelines(fctx)

    comparison = webutil.compare(tmpl, context, leftlines, rightlines)
    return tmpl('filecomparison',
                file=path,
                node=hex(ctx.node()),
                rev=ctx.rev(),
                date=ctx.date(),
                desc=ctx.description(),
                extra=ctx.extra(),
                author=ctx.user(),
                rename=rename,
                branch=webutil.nodebranchnodefault(ctx),
                parent=webutil.parents(fctx),
                child=webutil.children(fctx),
                leftrev=leftrev,
                leftnode=hex(leftnode),
                rightrev=rightrev,
                rightnode=hex(rightnode),
                comparison=comparison)

def manifest(web, req, tmpl):
    """
    /manifest[/{revision}[/{path}]]
    -------------------------------

    Show information about a directory.

    If the URL path arguments are omitted, information about the root
    directory for the ``tip`` changeset will be shown.

    Because this handler can only show information for directories, it
    is recommended to use the ``file`` handler instead, as it can handle both
    directories and files.

    The ``manifest`` template will be rendered for this handler.
    """
    ctx = webutil.changectx(web.repo, req)
    path = webutil.cleanpath(web.repo, req.form.get('file', [''])[0])
    mf = ctx.manifest()
    node = ctx.node()

    files = {}
    dirs = {}
    parity = paritygen(web.stripecount)

    if path and path[-1] != "/":
        path += "/"
    l = len(path)
    abspath = "/" + path

    for full, n in mf.iteritems():
        # the virtual path (working copy path) used for the full
        # (repository) path
        f = decodepath(full)

        if f[:l] != path:
            continue
        remain = f[l:]
        elements = remain.split('/')
        if len(elements) == 1:
            files[remain] = full
        else:
            h = dirs # need to retain ref to dirs (root)
            for elem in elements[0:-1]:
                if elem not in h:
                    h[elem] = {}
                h = h[elem]
                if len(h) > 1:
                    break
            h[None] = None # denotes files present

    if mf and not files and not dirs:
        raise ErrorResponse(HTTP_NOT_FOUND, 'path not found: ' + path)

    def filelist(**map):
        for f in sorted(files):
            full = files[f]

            fctx = ctx.filectx(full)
            yield {"file": full,
                   "parity": parity.next(),
                   "basename": f,
                   "date": fctx.date(),
                   "size": fctx.size(),
                   "permissions": mf.flags(full)}

    def dirlist(**map):
        for d in sorted(dirs):

            emptydirs = []
            h = dirs[d]
            while isinstance(