# -*- coding: utf-8 -*-

"""

    rhodecode.controllers.changeset

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    changeset controller for pylons showoing changes beetween

    revisions

    :created_on: Apr 25, 2010

    :author: marcink

    :copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>

    :license: GPLv3, see COPYING for more details.

"""

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import logging

import traceback

from collections import defaultdict

from webob.exc import HTTPForbidden

from pylons import tmpl_context as c, url, request, response

from pylons.i18n.translation import _

from pylons.controllers.util import redirect

from pylons.decorators import jsonify

from rhodecode.lib.vcs.exceptions import RepositoryError, ChangesetError, \

    ChangesetDoesNotExistError

from rhodecode.lib.vcs.nodes import FileNode

import rhodecode.lib.helpers as h

from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator

from rhodecode.lib.base import BaseRepoController, render

from rhodecode.lib.utils import EmptyChangeset

from rhodecode.lib.compat import OrderedDict

from rhodecode.lib import diffs

from rhodecode.model.comment import ChangesetCommentsModel

from rhodecode.model.changeset_status import ChangesetStatusModel

from rhodecode.model.meta import Session

from rhodecode.lib.diffs import wrapped_diff

log = logging.getLogger(__name__)

def _update_with_GET(params, GET):

    for k in ['diff1', 'diff2', 'diff']:

        params[k] += GET.getall(k)

def anchor_url(revision, path, GET):

    fid = h.FID(revision, path)

    return h.url.current(anchor=fid, **dict(GET))

def get_ignore_ws(fid, GET):

    ig_ws_global = GET.get('ignorews')

    ig_ws = filter(lambda k: k.startswith('WS'), GET.getall(fid))

    if ig_ws:

        try:

            return int(ig_ws[0].split(':')[-1])

        except:

            pass

    return ig_ws_global

def _ignorews_url(GET, fileid=None):

    fileid = str(fileid) if fileid else None

    params = defaultdict(list)

    _update_with_GET(params, GET)

    lbl = _('show white space')

    ig_ws = get_ignore_ws(fileid, GET)

    ln_ctx = get_line_ctx(fileid, GET)

    # global option

    if fileid is None:

        if ig_ws is None:

            params['ignorews'] += [1]

            lbl = _('ignore white space')

        ctx_key = 'context'

        ctx_val = ln_ctx

    # per file options

    else:

        if ig_ws is None:

            params[fileid] += ['WS:1']

            lbl = _('ignore white space')

        ctx_key = fileid

        ctx_val = 'C:%s' % ln_ctx

    # if we have passed in ln_ctx pass it along to our params

    if ln_ctx:

        params[ctx_key] += [ctx_val]

    params['anchor'] = fileid

    img = h.image(h.url('/images/icons/text_strikethrough.png'), lbl, class_='icon')

    return h.link_to(img, h.url.current(**params), title=lbl, class_='tooltip')

def get_line_ctx(fid, GET):

    ln_ctx_global = GET.get('context')

    ln_ctx = filter(lambda k: k.startswith('C'), GET.getall(fid))

    if ln_ctx:

        retval = ln_ctx[0].split(':')[-1]

    else:

        retval = ln_ctx_global

    try:

        return int(retval)

    except:

        return

def _context_url(GET, fileid=None):

    """

    Generates url for context lines

    :param fileid:

    """

    fileid = str(fileid) if fileid else None

    ig_ws = get_ignore_ws(fileid, GET)

    ln_ctx = (get_line_ctx(fileid, GET) or 3) * 2

    params = defaultdict(list)

    _update_with_GET(params, GET)

    # global option

    if fileid is None:

        if ln_ctx > 0:

            params['context'] += [ln_ctx]

        if ig_ws:

            ig_ws_key = 'ignorews'

            ig_ws_val = 1

    # per file option

    else:

        params[fileid] += ['C:%s' % ln_ctx]

        ig_ws_key = fileid

        ig_ws_val = 'WS:%s' % 1

    if ig_ws:

        params[ig_ws_key] += [ig_ws_val]

    lbl = _('%s line context') % ln_ctx

    params['anchor'] = fileid

    img = h.image(h.url('/images/icons/table_add.png'), lbl, class_='icon')

    return h.link_to(img, h.url.current(**params), title=lbl, class_='tooltip')

class ChangesetController(BaseRepoController):

    @LoginRequired()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def __before__(self):

        super(ChangesetController, self).__before__()

        c.affected_files_cut_off = 60

    def index(self, revision):

        c.anchor_url = anchor_url

        c.ignorews_url = _ignorews_url

        c.context_url = _context_url

        limit_off = request.GET.get('fulldiff')

        #get ranges of revisions if preset

        rev_range = revision.split('...')[:2]

        enable_comments = True

        try:

            if len(rev_range) == 2:

                enable_comments = False

                rev_start = rev_range[0]

                rev_end = rev_range[1]

                rev_ranges = c.rhodecode_repo.get_changesets(start=rev_start,

                                                            end=rev_end)

            else:

                rev_ranges = [c.rhodecode_repo.get_changeset(revision)]

            c.cs_ranges = list(rev_ranges)

            if not c.cs_ranges:

                raise RepositoryError('Changeset range returned empty result')

        except (RepositoryError, ChangesetDoesNotExistError, Exception), e:

            log.error(traceback.format_exc())

            h.flash(str(e), category='warning')

            return redirect(url('home'))

        c.changes = OrderedDict()

        c.lines_added = 0  # count of lines added

        c.lines_deleted = 0  # count of lines removes

        cumulative_diff = 0

        c.cut_off = False  # defines if cut off limit is reached

        c.comments = []

        c.statuses = []

        c.inline_comments = []

        c.inline_cnt = 0

        # Iterate over ranges (default changeset view is always one changeset)

        for changeset in c.cs_ranges:

                              .get_status(c.rhodecode_db_repo.repo_id,

            c.comments.extend(ChangesetCommentsModel()\

                              .get_comments(c.rhodecode_db_repo.repo_id,

                                            changeset.raw_id))

            inlines = ChangesetCommentsModel()\

                        .get_inline_comments(c.rhodecode_db_repo.repo_id,

                                             changeset.raw_id)

            c.inline_comments.extend(inlines)

            c.changes[changeset.raw_id] = []

            try:

                changeset_parent = changeset.parents[0]

            except IndexError:

                changeset_parent = None

            #==================================================================

            # ADDED FILES

            #==================================================================

            for node in changeset.added:

                fid = h.FID(revision, node.path)

                line_context_lcl = get_line_ctx(fid, request.GET)

                ign_whitespace_lcl = get_ignore_ws(fid, request.GET)

                lim = self.cut_off_limit

                if cumulative_diff > self.cut_off_limit:

                    lim = -1 if limit_off is None else None

                size, cs1, cs2, diff, st = wrapped_diff(

                    filenode_old=None,

                    filenode_new=node,

                    cut_off_limit=lim,

                    ignore_whitespace=ign_whitespace_lcl,

                    line_context=line_context_lcl,

                    enable_comments=enable_comments

                )

                cumulative_diff += size

                c.lines_added += st[0]

                c.lines_deleted += st[1]

                c.changes[changeset.raw_id].append(

                    ('added', node, diff, cs1, cs2, st)

                )

            #==================================================================

            # CHANGED FILES

            #==================================================================

            for node in changeset.changed:

                try:

                    filenode_old = changeset_parent.get_node(node.path)

                except ChangesetError:

                    log.warning('Unable to fetch parent node for diff')

                    filenode_old = FileNode(node.path, '', EmptyChangeset())

                fid = h.FID(revision, node.path)

                line_context_lcl = get_line_ctx(fid, request.GET)

                ign_whitespace_lcl = get_ignore_ws(fid, request.GET)

                lim = self.cut_off_limit

                if cumulative_diff > self.cut_off_limit:

                    lim = -1 if limit_off is None else None

                size, cs1, cs2, diff, st = wrapped_diff(

                    filenode_old=filenode_old,

                    filenode_new=node,

                    cut_off_limit=lim,

                    ignore_whitespace=ign_whitespace_lcl,

                    line_context=line_context_lcl,

                    enable_comments=enable_comments

                )

                cumulative_diff += size

                c.lines_added += st[0]

                c.lines_deleted += st[1]

                c.changes[changeset.raw_id].append(

                    ('changed', node, diff, cs1, cs2, st)

                )

            #==================================================================

            # REMOVED FILES

            #==================================================================

            for node in changeset.removed:

                c.changes[changeset.raw_id].append(

                    ('removed', node, None, None, None, (0, 0))

                )

        # count inline comments

        for path, lines in c.inline_comments:

            for comments in lines.values():

                c.inline_cnt += len(comments)

        if len(c.cs_ranges) == 1:

            c.changeset = c.cs_ranges[0]

            c.changes = c.changes[c.changeset.raw_id]

            return render('changeset/changeset.html')

        else:

            return render('changeset/changeset_range.html')

    def raw_changeset(self, revision):

        method = request.GET.get('diff', 'show')

        ignore_whitespace = request.GET.get('ignorews') == '1'

        line_context = request.GET.get('context', 3)

        try:

            c.scm_type = c.rhodecode_repo.alias

            c.changeset = c.rhodecode_repo.get_changeset(revision)

        except RepositoryError:

            log.error(traceback.format_exc())

            return redirect(url('home'))

        else:

            try:

                c.changeset_parent = c.changeset.parents[0]

            except IndexError:

                c.changeset_parent = None

            c.changes = []

            for node in c.changeset.added:

                filenode_old = FileNode(node.path, '')

                if filenode_old.is_binary or node.is_binary:

                    diff = _('binary file') + '\n'

                else:

                    f_gitdiff = diffs.get_gitdiff(filenode_old, node,

                                           ignore_whitespace=ignore_whitespace,

                                           context=line_context)

                    diff = diffs.DiffProcessor(f_gitdiff,

                                                format='gitdiff').raw_diff()

                cs1 = None

                cs2 = node.changeset.raw_id

                c.changes.append(('added', node, diff, cs1, cs2))

            for node in c.changeset.changed:

                filenode_old = c.changeset_parent.get_node(node.path)

                if filenode_old.is_binary or node.is_binary:

                    diff = _('binary file')

                else:

                    f_gitdiff = diffs.get_gitdiff(filenode_old, node,

                                           ignore_whitespace=ignore_whitespace,

                                           context=line_context)

                    diff = diffs.DiffProcessor(f_gitdiff,

                                                format='gitdiff').raw_diff()

                cs1 = filenode_old.changeset.raw_id

                cs2 = node.changeset.raw_id

                c.changes.append(('changed', node, diff, cs1, cs2))

        response.content_type = 'text/plain'

        if method == 'download':

            response.content_disposition = 'attachment; filename=%s.patch' \

                                            % revision

        c.parent_tmpl = ''.join(['# Parent  %s\n' % x.raw_id

                                 for x in c.changeset.parents])

        c.diffs = ''

        for x in c.changes:

            c.diffs += x[2]

        return render('changeset/raw_changeset.html')

    @jsonify

    def comment(self, repo_name, revision):

        comm = ChangesetCommentsModel().create(

            text=request.POST.get('text'),

            repo_id=c.rhodecode_db_repo.repo_id,

            user_id=c.rhodecode_user.user_id,

            revision=revision,

            f_path=request.POST.get('f_path'),

            line_no=request.POST.get('line')

        )

        Session.commit()

        if not request.environ.get('HTTP_X_PARTIAL_XHR'):

            return redirect(h.url('changeset_home', repo_name=repo_name,

                                  revision=revision))

        data = {

           'target_id': h.safeid(h.safe_unicode(request.POST.get('f_path'))),

        }

        if comm:

            c.co = comm

            data.update(comm.get_dict())

            data.update({'rendered_text':

                         render('changeset/changeset_comment_block.html')})

        return data

    @jsonify

    def delete_comment(self, repo_name, comment_id):

        co = ChangesetComment.get(comment_id)

        owner = lambda: co.author.user_id == c.rhodecode_user.user_id

        if h.HasPermissionAny('hg.admin', 'repository.admin')() or owner:

            ChangesetCommentsModel().delete(comment=co)

            Session.commit()

            return True

        else:

            raise HTTPForbidden()

"""Helper functions

Consists of functions to typically be used within templates, but also

available to Controllers. This module is available to both as 'h'.

"""

import random

import hashlib

import StringIO

import urllib

import math

import logging

from datetime import datetime

from pygments.formatters.html import HtmlFormatter

from pygments import highlight as code_highlight

from pylons import url, request, config

from pylons.i18n.translation import _, ungettext

from hashlib import md5

from webhelpers.html import literal, HTML, escape

from webhelpers.html.tools import *

from webhelpers.html.builder import make_tag

from webhelpers.html.tags import auto_discovery_link, checkbox, css_classes, \

    end_form, file, form, hidden, image, javascript_link, link_to, \

    link_to_if, link_to_unless, ol, required_legend, select, stylesheet_link, \

    submit, text, password, textarea, title, ul, xml_declaration, radio

from webhelpers.html.tools import auto_link, button_to, highlight, \

    js_obfuscate, mail_to, strip_links, strip_tags, tag_re

from webhelpers.number import format_byte_size, format_bit_size

from webhelpers.pylonslib import Flash as _Flash

from webhelpers.pylonslib.secure_form import secure_form

from webhelpers.text import chop_at, collapse, convert_accented_entities, \

    convert_misc_entities, lchop, plural, rchop, remove_formatting, \

    replace_whitespace, urlify, truncate, wrap_paragraphs

from webhelpers.date import time_ago_in_words

from webhelpers.paginate import Page

from webhelpers.html.tags import _set_input_attrs, _set_id_attr, \

    convert_boolean_attrs, NotGiven, _make_safe_id_component

from rhodecode.lib.annotate import annotate_highlight

from rhodecode.lib.utils import repo_name_slug

from rhodecode.lib.utils2 import str2bool, safe_unicode, safe_str, \

    get_changeset_safe

from rhodecode.lib.markup_renderer import MarkupRenderer

log = logging.getLogger(__name__)

def shorter(text, size=20):

    postfix = '...'

    if len(text) > size:

        return text[:size - len(postfix)] + postfix

    return text

def _reset(name, value=None, id=NotGiven, type="reset", **attrs):

    """

    Reset button

    """

    _set_input_attrs(attrs, type, name, value)

    _set_id_attr(attrs, id, name)

    convert_boolean_attrs(attrs, ["disabled"])

    return HTML.input(**attrs)

reset = _reset

safeid = _make_safe_id_component

def FID(raw_id, path):

    """

    Creates a uniqe ID for filenode based on it's hash of path and revision

    it's safe to use in urls

    :param raw_id:

    :param path:

    """

    return 'C-%s-%s' % (short_id(raw_id), md5(safe_str(path)).hexdigest()[:12])

def get_token():

    """Return the current authentication token, creating one if one doesn't

    already exist.

    """

    token_key = "_authentication_token"

    from pylons import session

    if not token_key in session:

        try:

            token = hashlib.sha1(str(random.getrandbits(128))).hexdigest()

        except AttributeError:  # Python < 2.4

            token = hashlib.sha1(str(random.randrange(2 ** 128))).hexdigest()

        session[token_key] = token

        if hasattr(session, 'save'):

            session.save()

    return session[token_key]

class _GetError(object):

    """Get error from form_errors, and represent it as span wrapped error

    message

    :param field_name: field to fetch errors for

    :param form_errors: form errors dict

    """

    def __call__(self, field_name, form_errors):

        tmpl = """<span class="error_msg">%s</span>"""

        if form_errors and form_errors.has_key(field_name):

            return literal(tmpl % form_errors.get(field_name))

get_error = _GetError()

class _ToolTip(object):

    def __call__(self, tooltip_title, trim_at=50):

        """Special function just to wrap our text into nice formatted

        autowrapped text

        :param tooltip_title:

        """

        return escape(tooltip_title)

tooltip = _ToolTip()

class _FilesBreadCrumbs(object):

    def __call__(self, repo_name, rev, paths):

        if isinstance(paths, str):

            paths = safe_unicode(paths)

        url_l = [link_to(repo_name, url('files_home',

                                        repo_name=repo_name,

                                        revision=rev, f_path=''))]

        paths_l = paths.split('/')

        for cnt, p in enumerate(paths_l):

            if p != '':

                url_l.append(link_to(p,

                                     url('files_home',

                                         repo_name=repo_name,

                                         revision=rev,

                                         f_path='/'.join(paths_l[:cnt + 1])

                                         )

                                     )

                             )

        return literal('/'.join(url_l))

files_breadcrumbs = _FilesBreadCrumbs()

class CodeHtmlFormatter(HtmlFormatter):

    """

    My code Html Formatter for source codes

    """

    def wrap(self, source, outfile):

        return self._wrap_div(self._wrap_pre(self._wrap_code(source)))

    def _wrap_code(self, source):

        for cnt, it in enumerate(source):

            i, t = it

            t = '<div id="L%s">%s</div>' % (cnt + 1, t)

            yield i, t

    def _wrap_tablelinenos(self, inner):

        dummyoutfile = StringIO.StringIO()

        lncount = 0

        for t, line in inner:

            if t:

                lncount += 1

            dummyoutfile.write(line)

        fl = self.linenostart

        mw = len(str(lncount + fl - 1))

        sp = self.linenospecial

        st = self.linenostep

        la = self.lineanchors

        aln = self.anchorlinenos

        nocls = self.noclasses

        if sp:

            lines = []

            for i in range(fl, fl + lncount):

                if i % st == 0:

                    if i % sp == 0:

                        if aln:

                            lines.append('<a href="#%s%d" class="special">%*d</a>' %

                                         (la, i, mw, i))

                        else:

                            lines.append('<span class="special">%*d</span>' % (mw, i))

                    else:

                        if aln:

                            lines.append('<a href="#%s%d">%*d</a>' % (la, i, mw, i))

                        else:

                            lines.append('%*d' % (mw, i))

                else:

                    lines.append('')

            ls = '\n'.join(lines)

        else:

            lines = []

            for i in range(fl, fl + lncount):

                if i % st == 0:

                    if aln:

                        lines.append('<a href="#%s%d">%*d</a>' % (la, i, mw, i))

                    else:

                        lines.append('%*d' % (mw, i))

                else:

                    lines.append('')

            ls = '\n'.join(lines)

        # in case you wonder about the seemingly redundant <div> here: since the

        # content in the other cell also is wrapped in a div, some browsers in

        # some configurations seem to mess up the formatting...

        if nocls:

            yield 0, ('<table class="%stable">' % self.cssclass +

                      '<tr><td><div class="linenodiv" '

                      'style="background-color: #f0f0f0; padding-right: 10px">'

                      '<pre style="line-height: 125%">' +

                      ls + '</pre></div></td><td id="hlcode" class="code">')

        else:

            yield 0, ('<table class="%stable">' % self.cssclass +

                      '<tr><td class="linenos"><div class="linenodiv"><pre>' +

                      ls + '</pre></div></td><td id="hlcode" class="code">')

        yield 0, dummyoutfile.getvalue()

        yield 0, '</td></tr></table>'

def pygmentize(filenode, **kwargs):

    """pygmentize function using pygments

    :param filenode:

    """

    return literal(code_highlight(filenode.content,

                                  filenode.lexer, CodeHtmlFormatter(**kwargs)))

                self.previous_page = self.page - 1

            else:

                self.previous_page = None

            if self.page < self.last_page:

                self.next_page = self.page + 1

            else:

                self.next_page = None

        # No items available

        else:

            self.first_page = None

            self.page_count = 0

            self.last_page = None

            self.first_item = None

            self.last_item = None

            self.previous_page = None

            self.next_page = None

            self.items = []

        # This is a subclass of the 'list' type. Initialise the list now.

        list.__init__(self, reversed(self.items))

def changed_tooltip(nodes):

    """

    Generates a html string for changed nodes in changeset page.

    It limits the output to 30 entries

    :param nodes: LazyNodesGenerator

    """

    if nodes:

        pref = ': <br/> '

        suf = ''

        if len(nodes) > 30:

            suf = '<br/>' + _(' and %s more') % (len(nodes) - 30)

        return literal(pref + '<br/> '.join([safe_unicode(x.path)

                                             for x in nodes[:30]]) + suf)

    else:

        return ': ' + _('No Files')

def repo_link(groups_and_repos):

    """

    Makes a breadcrumbs link to repo within a group

    joins » on each group to create a fancy link

    ex::

        group >> subgroup >> repo

    :param groups_and_repos:

    """

    groups, repo_name = groups_and_repos

    if not groups:

        return repo_name

    else:

        def make_link(group):

            return link_to(group.name, url('repos_group_home',

                                           group_name=group.group_name))

        return literal(' » '.join(map(make_link, groups)) + \

                       " » " + repo_name)

def fancy_file_stats(stats):

    """

    Displays a fancy two colored bar for number of added/deleted

    lines of code on file

    :param stats: two element list of added/deleted lines of code

    """

    a, d, t = stats[0], stats[1], stats[0] + stats[1]

    width = 100

    unit = float(width) / (t or 1)

    # needs > 9% of width to be visible or 0 to be hidden

    a_p = max(9, unit * a) if a > 0 else 0

    d_p = max(9, unit * d) if d > 0 else 0

    p_sum = a_p + d_p

    if p_sum > width:

        #adjust the percentage to be == 100% since we adjusted to 9

        if a_p > d_p:

            a_p = a_p - (p_sum - width)

        else:

            d_p = d_p - (p_sum - width)

    a_v = a if a > 0 else ''

    d_v = d if d > 0 else ''

    def cgen(l_type):

        mapping = {'tr': 'top-right-rounded-corner-mid',

                   'tl': 'top-left-rounded-corner-mid',

                   'br': 'bottom-right-rounded-corner-mid',

                   'bl': 'bottom-left-rounded-corner-mid'}

        map_getter = lambda x: mapping[x]

        if l_type == 'a' and d_v:

            #case when added and deleted are present

            return ' '.join(map(map_getter, ['tl', 'bl']))

        if l_type == 'a' and not d_v:

            return ' '.join(map(map_getter, ['tr', 'br', 'tl', 'bl']))

        if l_type == 'd' and a_v:

            return ' '.join(map(map_getter, ['tr', 'br']))

        if l_type == 'd' and not a_v:

            return ' '.join(map(map_getter, ['tr', 'br', 'tl', 'bl']))

    d_a = '<div class="added %s" style="width:%s%%">%s</div>' % (

        cgen('a'), a_p, a_v

    )

    d_d = '<div class="deleted %s" style="width:%s%%">%s</div>' % (

        cgen('d'), d_p, d_v

    )

    return literal('<div style="width:%spx">%s%s</div>' % (width, d_a, d_d))

def urlify_text(text_):

    import re

    url_pat = re.compile(r'''(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]'''

                         '''|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)''')

    def url_func(match_obj):

        url_full = match_obj.groups()[0]

        return '<a href="%(url)s">%(url)s</a>' % ({'url': url_full})

    return literal(url_pat.sub(url_func, text_))

def urlify_changesets(text_, repository):

    """

    Extract revision ids from changeset and make link from them

    :param text_:

    :param repository:

    """

    import re

    URL_PAT = re.compile(r'([0-9a-fA-F]{12,})')

    def url_func(match_obj):

        rev = match_obj.groups()[0]

        pref = ''

        if match_obj.group().startswith(' '):

            pref = ' '

        tmpl = (

        '%(pref)s<a class="%(cls)s" href="%(url)s">'

        '%(rev)s'

        '</a>'

        )

        return tmpl % {

         'pref': pref,

         'cls': 'revision-link',

         'url': url('changeset_home', repo_name=repository, revision=rev),

         'rev': rev,

        }

    newtext = URL_PAT.sub(url_func, text_)

    return newtext

def urlify_commit(text_, repository=None, link_=None):

    """

    Parses given text message and makes proper links.

    issues are linked to given issue-server, and rest is a changeset link

    if link_ is given, in other case it's a plain text

    :param text_:

    :param repository:

    :param link_: changeset link

    """

    import re

    import traceback

    def escaper(string):

        return string.replace('<', '&lt;').replace('>', '&gt;')

    def linkify_others(t, l):

        urls = re.compile(r'(\<a.*?\<\/a\>)',)

        links = []

        for e in urls.split(t):

            if not urls.match(e):

                links.append('<a class="message-link" href="%s">%s</a>' % (l, e))

            else:

                links.append(e)

        return ''.join(links)

    # urlify changesets - extrac revisions and make link out of them

    text_ = urlify_changesets(escaper(text_), repository)

    try:

        conf = config['app_conf']

        URL_PAT = re.compile(r'%s' % conf.get('issue_pat'))

        if URL_PAT:

            ISSUE_SERVER_LNK = conf.get('issue_server_link')

            ISSUE_PREFIX = conf.get('issue_prefix')

            def url_func(match_obj):

                pref = ''

                if match_obj.group().startswith(' '):

                    pref = ' '

                issue_id = ''.join(match_obj.groups())

                tmpl = (