def _filerevision(web, tmpl, fctx):
    f = fctx.path()
    text = fctx.data()
    parity = paritygen(web.stripecount)

    if binary(text):
        mt = mimetypes.guess_type(f)[0] or 'application/octet-stream'
        text = '(binary:%s)' % mt

    def lines():
        for lineno, t in enumerate(text.splitlines(True)):
            yield {"line": t,
                   "lineid": "l%d" % (lineno + 1),
                   "linenumber": "% 6d" % (lineno + 1),
                   "parity": parity.next()}

    return tmpl("filerevision",
                file=f,
                path=webutil.up(f),
                text=lines(),
                rev=fctx.rev(),
                node=hex(fctx.node()),
                author=fctx.user(),
                date=fctx.date(),
                desc=fctx.description(),
                branch=webutil.nodebranchnodefault(fctx),
                parent=webutil.parents(fctx),
                child=webutil.children(fctx),
                rename=webutil.renamelink(fctx),
                permissions=fctx.manifest().flags(f))

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 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

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

    Show changeset information for each line in a file.

    The ``fileannotate`` template is rendered.
    """
    fctx = webutil.filectx(web.repo, req)
    f = fctx.path()
    parity = paritygen(web.stripecount)
    diffopts = patch.difffeatureopts(web.repo.ui, untrusted=True,
                                     section='annotate', whitespace=True)

    def annotate(**map):
        last = None
        if util.binary(fctx.data()):
            mt = (mimetypes.guess_type(fctx.path())[0]
                  or 'application/octet-stream')
            lines = enumerate([((fctx.filectx(fctx.filerev()), 1),
                                '(binary:%s)' % mt)])
        else:
            lines = enumerate(fctx.annotate(follow=True, linenumber=True,
                                            diffopts=diffopts))
        for lineno, ((f, targetline), l) in lines:
            fnode = f.filenode()

            if last != fnode:
                last = fnode

            yield {"parity": parity.next(),
                   "node": f.hex(),
                   "rev": f.rev(),
                   "author": f.user(),
                   "desc": f.description(),
                   "extra": f.extra(),
                   "file": f.path(),
                   "targetline": targetline,
                   "line": l,
                   "lineno": lineno + 1,
                   "lineid": "l%d" % (lineno + 1),
                   "linenumber": "% 6d" % (lineno + 1),
                   "revdate": f.date()}

    return tmpl("fileannotate",
                file=f,
                annotate=annotate,
                path=webutil.up(f),
                rev=fctx.rev(),
                node=fctx.hex(),
                author=fctx.user(),
                date=fctx.date(),
                desc=fctx.description(),
                extra=fctx.extra(),
                rename=webutil.renamelink(fctx),
                branch=webutil.nodebranchnodefault(fctx),
                parent=webutil.parents(fctx),
                child=webutil.children(fctx),
                permissions=fctx.manifest().flags(f))

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

        repo = web.repo
        revs = repo.changelog.revs(start, end - 1)
        if latestonly:
            for r in revs:
                pass
            revs = (r,)
        for i in revs:
            iterfctx = fctx.filectx(i)

            l.append({"parity": parity.next(),
                      "filerev": i,
                      "file": f,
                      "node": iterfctx.hex(),
                      "author": iterfctx.user(),
                      "date": iterfctx.date(),
                      "rename": webutil.renamelink(iterfctx),
                      "parent": webutil.parents(iterfctx),
                      "child": webutil.children(iterfctx),
                      "desc": iterfctx.description(),
                      "extra": iterfctx.extra(),
                      "tags": webutil.nodetagsdict(repo, iterfctx.node()),
                      "bookmarks": webutil.nodebookmarksdict(
                          repo, iterfctx.node()),
                      "branch": webutil.nodebranchnodefault(iterfctx),
                      "inbranch": webutil.nodeinbranch(repo, iterfctx),
                      "branches": webutil.nodebranchdict(repo, iterfctx)})
        for e in reversed(l):
            yield e

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 annotate(web, req, tmpl):
    fctx = webutil.filectx(web.repo, req)
    f = fctx.path()
    parity = paritygen(web.stripecount)
    diffopts = patch.diffopts(web.repo.ui, untrusted=True, section="annotate")

    def annotate(**map):
        last = None
        if binary(fctx.data()):
            mt = mimetypes.guess_type(fctx.path())[0] or "application/octet-stream"
            lines = enumerate([((fctx.filectx(fctx.filerev()), 1), "(binary:%s)" % mt)])
        else:
            lines = enumerate(fctx.annotate(follow=True, linenumber=True, diffopts=diffopts))
        for lineno, ((f, targetline), l) in lines:
            fnode = f.filenode()

            if last != fnode:
                last = fnode

            yield {
                "parity": parity.next(),
                "node": f.hex(),
                "rev": f.rev(),
                "author": f.user(),
                "desc": f.description(),
                "extra": f.extra(),
                "file": f.path(),
                "targetline": targetline,
                "line": l,
                "lineid": "l%d" % (lineno + 1),
                "linenumber": "% 6d" % (lineno + 1),
                "revdate": f.date(),
            }

    return tmpl(
        "fileannotate",
        file=f,
        annotate=annotate,
        path=webutil.up(f),
        rev=fctx.rev(),
        node=fctx.hex(),
        author=fctx.user(),
        date=fctx.date(),
        desc=fctx.description(),
        extra=fctx.extra(),
        rename=webutil.renamelink(fctx),
        branch=webutil.nodebranchnodefault(fctx),
        parent=webutil.parents(fctx),
        child=webutil.children(fctx),
        permissions=fctx.manifest().flags(f),
    )

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 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,
    )