def delete_cs_pr_comment(repo_name, comment_id):

    """Delete a comment from a changeset or pull request"""

    co = ChangesetComment.get_or_404(comment_id)

    if co.repo.repo_name != repo_name:

        raise HTTPNotFound()

    if co.pull_request and co.pull_request.is_closed():

        # don't allow deleting comments on closed pull request

        raise HTTPForbidden()

    owner = co.author_id == request.authuser.user_id

    repo_admin = h.HasRepoPermissionLevel('admin')(repo_name)

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

        ChangesetCommentsModel().delete(comment=co)

        Session().commit()

        return True

    else:

        raise HTTPForbidden()

class ChangesetController(BaseRepoController):

    def _before(self, *args, **kwargs):

        super(ChangesetController, self)._before(*args, **kwargs)

        c.affected_files_cut_off = 60

    def _index(self, revision, method):

        c.pull_request = None

        c.anchor_url = anchor_url

        c.ignorews_url = _ignorews_url

        c.context_url = _context_url

        c.fulldiff = request.GET.get('fulldiff') # for reporting number of changed files

        # get ranges of revisions if preset

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

        enable_comments = True

        c.cs_repo = c.db_repo

        try:

            if len(rev_range) == 2:

                enable_comments = False

                rev_start = rev_range[0]

                rev_end = rev_range[1]

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

                                                             end=rev_end)

            else:

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

            c.cs_ranges = list(rev_ranges)

            if not c.cs_ranges:

                raise RepositoryError('Changeset range returned empty result')

        c.comments = [com for com_id, com in sorted(comments.items())]

        # count inline comments

        for __, 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.parent_tmpl = ''.join(['# Parent  %s\n' % x.raw_id

                                     for x in c.changeset.parents])

        if method == 'download':

            response.content_type = 'text/plain'

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

                                            % revision[:12]

            return raw_diff

        elif method == 'patch':

            response.content_type = 'text/plain'

            c.diff = safe_unicode(raw_diff)

            return render('changeset/patch_changeset.html')

        elif method == 'raw':

            response.content_type = 'text/plain'

            return raw_diff

        elif method == 'show':

            if len(c.cs_ranges) == 1:

                return render('changeset/changeset.html')

            else:

                c.cs_ranges_org = None

                c.cs_comments = {}

                revs = [ctx.revision for ctx in reversed(c.cs_ranges)]

                c.jsdata = graph_data(c.db_repo_scm_instance, revs)

                return render('changeset/changeset_range.html')

    @LoginRequired(allow_default_user=True)

    @HasRepoPermissionLevelDecorator('read')

    def index(self, revision, method='show'):

        return self._index(revision, method=method)

    @LoginRequired(allow_default_user=True)

    @HasRepoPermissionLevelDecorator('read')

    def changeset_raw(self, revision):

        return self._index(revision, method='raw')

    @LoginRequired(allow_default_user=True)

    @HasRepoPermissionLevelDecorator('read')

    def changeset_patch(self, revision):

        return self._index(revision, method='patch')

        PullRequestModel().remove_reviewers(user, pull_request, removed_reviewers)

        Session().commit()

        h.flash(_('Pull request updated'), category='success')

        raise HTTPFound(location=pull_request.url())

    @LoginRequired()

    @HasRepoPermissionLevelDecorator('read')

    @jsonify

    def delete(self, repo_name, pull_request_id):

        pull_request = PullRequest.get_or_404(pull_request_id)

        # only owner can delete it !

        if pull_request.owner_id == request.authuser.user_id:

            PullRequestModel().delete(pull_request)

            Session().commit()

            h.flash(_('Successfully deleted pull request'),

                    category='success')

            raise HTTPFound(location=url('my_pullrequests'))

        raise HTTPForbidden()

    @LoginRequired(allow_default_user=True)

    @HasRepoPermissionLevelDecorator('read')

    def show(self, repo_name, pull_request_id, extra=None):

        c.pull_request = PullRequest.get_or_404(pull_request_id)

        c.allowed_to_change_status = self._is_allowed_to_change_status(c.pull_request)

        cc_model = ChangesetCommentsModel()

        cs_model = ChangesetStatusModel()

        # pull_requests repo_name we opened it against

        # ie. other_repo must match

        if repo_name != c.pull_request.other_repo.repo_name:

            raise HTTPNotFound

        # load compare data into template context

        c.cs_repo = c.pull_request.org_repo

        (c.cs_ref_type,

         c.cs_ref_name,

         c.cs_rev) = c.pull_request.org_ref.split(':')

        c.a_repo = c.pull_request.other_repo

        (c.a_ref_type,

         c.a_ref_name,

         c.a_rev) = c.pull_request.other_ref.split(':') # a_rev is ancestor

        org_scm_instance = c.cs_repo.scm_instance # property with expensive cache invalidation check!!!

        try:

            c.cs_ranges = []

    def get_by_repo_name(self, repo_name, cache=False):

        repo = Repository.query() \

            .filter(Repository.repo_name == repo_name)

        if cache:

            repo = repo.options(FromCache("sql_cache_short",

                                          "get_repo_%s" % repo_name))

        return repo.scalar()

    def get_all_user_repos(self, user):

        """

        Gets all repositories that user have at least read access

        :param user:

        """

        from kallithea.lib.auth import AuthUser

        user = User.guess_instance(user)

        repos = AuthUser(dbuser=user).permissions['repositories']

        access_check = lambda r: r[1] in ['repository.read',

                                          'repository.write',

                                          'repository.admin']

        repos = [x[0] for x in filter(access_check, repos.items())]

        return Repository.query().filter(Repository.repo_name.in_(repos))

    @classmethod

    def _render_datatable(cls, tmpl, *args, **kwargs):

        import kallithea

        from tg import tmpl_context as c, request, app_globals

        from tg.i18n import ugettext as _

        _tmpl_lookup = app_globals.mako_lookup

        template = _tmpl_lookup.get_template('data_table/_dt_elements.html')

        tmpl = template.get_def(tmpl)

        kwargs.update(dict(_=_, h=h, c=c, request=request))

        return tmpl.render(*args, **kwargs)

    def get_repos_as_dict(self, repos_list, repo_groups_list=None,

                          admin=False,

                          short_name=False):

        """Return repository list for use by DataTable.

        repos_list: list of repositories - but will be filtered for read permission.

        repo_groups_list: added at top of list without permission check.

        admin: return data for action column.

        """

        _render = self._render_datatable

        from tg import tmpl_context as c

<%inherit file="/base/base.html"/>

<%namespace name="comment" file="/changeset/changeset_file_comment.html"/>

<%block name="title">

    ${_('%s Changeset') % c.repo_name} - ${h.show_id(c.changeset)}

</%block>

<%def name="breadcrumbs_links()">

    ${_('Changeset')} - <span class='changeset_hash'>${h.show_id(c.changeset)}</span>

</%def>

<%block name="header_menu">

    ${self.menu('repositories')}

</%block>

<%def name="main()">

${self.repo_context_bar('changelog', c.changeset.raw_id)}

<div class="panel panel-primary">

  <div class="panel-heading clearfix">

    ${self.breadcrumbs()}

  </div>

  <script>

    AJAX_COMMENT_URL = ${h.js(url('changeset_comment',repo_name=c.repo_name,revision=c.changeset.raw_id))};

    AJAX_COMMENT_DELETE_URL = ${h.js(url('changeset_comment_delete',repo_name=c.repo_name,comment_id='__COMMENT_ID__'))};

  </script>

  <div class="panel-body">

    <div class="panel panel-default">

        <div class="panel-heading clearfix">

            ${self.parent_child_navigation()}

                <div class="pull-left" title="${_('Changeset status')}">

                    %if c.statuses:

                        <i class="icon-circle changeset-status-${c.statuses[0]}"></i>

                        [${h.changeset_status_lbl(c.statuses[0])}]

                    %endif

                </div>

                <div class="diff-actions pull-left">

                  <a href="${h.url('changeset_raw_home',repo_name=c.repo_name,revision=c.changeset.raw_id)}"

                     data-toggle="tooltip"

                     title="${_('Raw diff')}"><i class="icon-diff"></i></a>

                  <a href="${h.url('changeset_patch_home',repo_name=c.repo_name,revision=c.changeset.raw_id)}"

                     data-toggle="tooltip"

                     title="${_('Patch diff')}"><i class="icon-file-powerpoint"></i></a>

                  <a href="${h.url('changeset_download_home',repo_name=c.repo_name,revision=c.changeset.raw_id,diff='download')}"

                     data-toggle="tooltip"

                     title="${_('Download diff')}"><i class="icon-floppy"></i></a>

                  ${ungettext('%s file changed with %s insertions and %s deletions','%s files changed with %s insertions and %s deletions', len(c.file_diff_data)) % (len(c.file_diff_data),c.lines_added,c.lines_deleted)}:

              %endif

              </h5>

              <div class="cs_files">

                %if not c.file_diff_data:

                   <span class="text-muted">${_('No files')}</span>

                %endif

                %for fid, url_fid, op, a_path, path, diff, stats in c.file_diff_data:

                    <div class="cs_${op} clearfix">

                      <span class="node">

                          <i class="icon-diff-${op}"></i>

                          ${h.link_to(h.safe_unicode(path), '#%s' % fid)}

                      </span>

                      <div class="changes">${h.fancy_file_stats(stats)}</div>

                    </div>

                %endfor

                %if c.limited_diff:

                  <h5>${_('Changeset was too big and was cut off...')} <a href="${h.url.current(fulldiff=1, **request.GET.mixed())}">${_('Show full diff anyway')}</a></h5>

                %endif

              </div>

            </div>

        </div>

    </div>

    <script>

    // TODO: switch this to pyroutes

    AJAX_COMMENT_URL = ${h.js(url('pullrequest_comment',repo_name=c.repo_name,pull_request_id=c.pull_request.pull_request_id))};

    AJAX_COMMENT_DELETE_URL = ${h.js(url('pullrequest_comment_delete',repo_name=c.repo_name,comment_id='__COMMENT_ID__'))};

    pyroutes.register('pullrequest_comment', ${h.js(url('pullrequest_comment',repo_name='%(repo_name)s',pull_request_id='%(pull_request_id)s'))}, ['repo_name', 'pull_request_id']);

    pyroutes.register('pullrequest_comment_delete', ${h.js(url('pullrequest_comment_delete',repo_name='%(repo_name)s',comment_id='%(comment_id)s'))}, ['repo_name', 'comment_id']);

    </script>

    ## diff block

    <div class="panel-body">

    <div class="commentable-diff">

    <%namespace name="diff_block" file="/changeset/diff_block.html"/>

    ${diff_block.diff_block_js()}

    ${diff_block.diff_block(c.a_repo.repo_name, c.a_ref_type, c.a_ref_name, c.a_rev,

                            c.cs_repo.repo_name, c.cs_ref_type, c.cs_ref_name, c.cs_rev, c.file_diff_data)}

    % if c.limited_diff:

      <h4>${_('Changeset was too big and was cut off...')} <a href="${h.url.current(fulldiff=1, **request.GET.mixed())}">${_('Show full diff anyway')}</a></h4>

    % endif

    </div>

    ## template for inline comment form

    ${comment.comment_inline_form()}