: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

        repo_model = RepoModel()

        c.users_array = repo_model.get_users_js()

        c.users_groups_array = repo_model.get_users_groups_js()

    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.changeset_statuses = ChangesetStatus.STATUSES

        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:

            c.statuses.extend([ChangesetStatusModel()\

                              .get_status(c.rhodecode_db_repo.repo_id,

                                          changeset.raw_id)])

            c.comments.extend(ChangesetCommentsModel()\

                              .get_comments(c.rhodecode_db_repo.repo_id,

            inlines = ChangesetCommentsModel()\

                        .get_inline_comments(c.rhodecode_db_repo.repo_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 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):

        status = request.POST.get('changeset_status')

        change_status = request.POST.get('change_changeset_status')

        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'),

            status_change=(ChangesetStatus.get_status_lbl(status) 

                           if status and change_status else None)

        )

        # get status if set !

        if status and change_status:

            ChangesetStatusModel().set_status(

                c.rhodecode_db_repo.repo_id,

                revision,

                status,

    def __get_changeset_comment(self, changeset_comment):

        return self._get_instance(ChangesetComment, changeset_comment)

    def _extract_mentions(self, s):

        user_objects = []

        for username in extract_mentioned_users(s):

            user_obj = User.get_by_username(username, case_insensitive=True)

            if user_obj:

                user_objects.append(user_obj)

        return user_objects

    def create(self, text, repo_id, user_id, revision, f_path=None,

               line_no=None, status_change=None):

        """

        Creates new comment for changeset. IF status_change is not none

        this comment is associated with a status change of changeset

        :param text:

        :param repo_id:

        :param user_id:

        :param revision:

        :param f_path:

        :param line_no:

        :param status_change:

        """

        if text:

            repo = Repository.get(repo_id)

            cs = repo.scm_instance.get_changeset(revision)

            desc = "%s - %s" % (cs.short_id, h.shorter(cs.message, 256))

            author_email = cs.author_email

            comment = ChangesetComment()

            comment.repo = repo

            comment.user_id = user_id

            comment.revision = revision

            comment.text = text

            comment.f_path = f_path

            comment.line_no = line_no

            self.sa.add(comment)

            self.sa.flush()

            # make notification

            line = ''

            if line_no:

                line = _('on line %s') % line_no

            subj = safe_unicode(

                h.link_to('Re commit: %(commit_desc)s %(line)s' % \

                          {'commit_desc': desc, 'line': line},

                          h.url('changeset_home', repo_name=repo.repo_name,

                                revision=revision,

                                anchor='comment-%s' % comment.comment_id,

                                qualified=True,

                          )

                )

            )

            body = text

            # get the current participants of this changeset

            recipients = ChangesetComment.get_users(revision=revision)

            # add changeset author if it's in rhodecode system

            recipients += [User.get_by_email(author_email)]

            # create notification objects, and emails

            NotificationModel().create(

              created_by=user_id, subject=subj, body=body,

              recipients=recipients, type_=Notification.TYPE_CHANGESET_COMMENT,

              email_kwargs={'status_change': status_change}

            )

            mention_recipients = set(self._extract_mentions(body))\

                                    .difference(recipients)

            if mention_recipients:

                subj = _('[Mention]') + ' ' + subj

                NotificationModel().create(

                    created_by=user_id, subject=subj, body=body,

                    recipients=mention_recipients,

                    type_=Notification.TYPE_CHANGESET_COMMENT,

                    email_kwargs={'status_change': status_change}

                )

            return comment

    def delete(self, comment):

        """

        Deletes given comment

        :param comment_id:

        """

        comment = self.__get_changeset_comment(comment)

        self.sa.delete(comment)

        return comment

                .filter(ChangesetComment.repo_id == repo_id)\

                .filter(ChangesetComment.line_no == None)\

            .filter(ChangesetComment.repo_id == repo_id)\

            .filter(ChangesetComment.line_no != None)\

            .filter(ChangesetComment.f_path != None)\

            .order_by(ChangesetComment.comment_id.asc())\

        paths = defaultdict(lambda: defaultdict(list))

        for co in comments:

            paths[co.f_path][co.line_no].append(co)

        return paths.items()

                </div>

                <div class="diff-actions">

                  <a href="${h.url('raw_changeset_home',repo_name=c.repo_name,revision=c.changeset.raw_id,diff='show')}"  class="tooltip" title="${h.tooltip(_('raw diff'))}"><img class="icon" src="${h.url('/images/icons/page_white.png')}"/></a>

                  <a href="${h.url('raw_changeset_home',repo_name=c.repo_name,revision=c.changeset.raw_id,diff='download')}"  class="tooltip" title="${h.tooltip(_('download diff'))}"><img class="icon" src="${h.url('/images/icons/page_white_get.png')}"/></a>

                  ${c.ignorews_url(request.GET)}

                  ${c.context_url(request.GET)}

                </div>

                <div class="comments-number" style="float:right;padding-right:5px">${ungettext("%d comment", "%d comments", len(c.comments)) % len(c.comments)} ${ungettext("(%d inline)", "(%d inline)", c.inline_cnt) % c.inline_cnt}</div>

			</div>

		</div>

	    <div id="changeset_content">

			<div class="container">

	             <div class="left">

	                 <div class="author">

	                     <div class="gravatar">

	                         <img alt="gravatar" src="${h.gravatar_url(h.email(c.changeset.author),20)}"/>

	                     </div>

	                     <span>${h.person(c.changeset.author)}</span><br/>

	                     <span><a href="mailto:${h.email_or_none(c.changeset.author)}">${h.email_or_none(c.changeset.author)}</a></span><br/>

	                 </div>

	                 <div class="message">${h.urlify_commit(c.changeset.message, c.repo_name)}</div>

	             </div>

	             <div class="right">

		             <div class="changes">

                        % if len(c.changeset.affected_files) <= c.affected_files_cut_off:

		                 <span class="removed" title="${_('removed')}">${len(c.changeset.removed)}</span>

		                 <span class="changed" title="${_('changed')}">${len(c.changeset.changed)}</span>

		                 <span class="added" title="${_('added')}">${len(c.changeset.added)}</span>

	                    % else:

                         <span class="removed" title="${_('affected %s files') % len(c.changeset.affected_files)}">!</span>

                         <span class="changed" title="${_('affected %s files') % len(c.changeset.affected_files)}">!</span>

                         <span class="added"   title="${_('affected %s files') % len(c.changeset.affected_files)}">!</span>

	                    % endif

		             </div>

		            %if c.changeset.parents:

		             %for p_cs in reversed(c.changeset.parents):

		                 <div class="parent">${_('Parent')}

                     <span class="changeset_id">${p_cs.revision}:<span class="changeset_hash">${h.link_to(h.short_id(p_cs.raw_id),

		                     h.url('changeset_home',repo_name=c.repo_name,revision=p_cs.raw_id),title=p_cs.message)}</span></span>

		                 </div>

		             %endfor

                    %else:

                        <div class="parent">${_('No parents')}</div>

                    %endif

		         <span class="logtags">

                 %if len(c.changeset.parents)>1:

                 <span class="merge">${_('merge')}</span>

                 %endif

		             %if c.changeset.branch:

                     <span class="branchtag" title="${'%s %s' % (_('branch'),c.changeset.branch)}">

		             ${h.link_to(c.changeset.branch,h.url('files_home',repo_name=c.repo_name,revision=c.changeset.raw_id))}

                     </span>

                     %endif

		             %for tag in c.changeset.tags:

		                 <span class="tagtag"  title="${'%s %s' % (_('tag'),tag)}">

		                 ${h.link_to(tag,h.url('files_home',repo_name=c.repo_name,revision=c.changeset.raw_id))}</span>

		             %endfor

		         </span>

	                </div>

	        </div>

	        <span>

	        ${_('%s files affected with %s insertions and %s deletions:') % (len(c.changeset.affected_files),c.lines_added,c.lines_deleted)}

	        </span>

	        <div class="cs_files">

	                %for change,filenode,diff,cs1,cs2,stat in c.changes:

	                    <div class="cs_${change}">

                            <div class="node">

                            %if change != 'removed':

                                ${h.link_to(h.safe_unicode(filenode.path),c.anchor_url(filenode.changeset.raw_id,filenode.path,request.GET)+"_target")}

                            %else:

                                ${h.link_to(h.safe_unicode(filenode.path),h.url.current(anchor=h.FID('',filenode.path)))}

                            %endif

                            </div>

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

	                    </div>

	                %endfor

	                % if c.cut_off:

	                  ${_('Changeset was too big and was cut off...')}

	                % endif

	        </div>

	    </div>

    </div>

    <script>

    var _USERS_AC_DATA = ${c.users_array|n};

    var _GROUPS_AC_DATA = ${c.users_groups_array|n};

    </script>

    ## diff block

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

    ${diff_block.diff_block(c.changes)}

    ## template for inline comment form

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

    ${comment.comment_inline_form(c.changeset)}

    <script type="text/javascript">

      YUE.onDOMReady(function(){

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

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

          YUE.on(YUQ('.show-inline-comments'),'change',function(e){

              var show = 'none';

              var target = e.currentTarget;

              if(target.checked){

                  var show = ''

              }

              var boxid = YUD.getAttribute(target,'id_for');

              var comments = YUQ('#{0} .inline-comments'.format(boxid));

              for(c in comments){

                 YUD.setStyle(comments[c],'display',show);

              }

              var btns = YUQ('#{0} .inline-comments-button'.format(boxid));

              for(c in btns){

                  YUD.setStyle(btns[c],'display',show);

               }

          })

          YUE.on(YUQ('.line'),'click',function(e){

              var tr = e.currentTarget;

              injectInlineForm(tr);

          });

          // inject comments into they proper positions

          var file_comments = YUQ('.inline-comment-placeholder');

          renderInlineComments(file_comments);

      })

    </script>

    </div>

</%def>

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

## usage:

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

## ${comment.comment_block(co)}

##

<%def name="comment_block(co)">

  <div class="comment" id="comment-${co.comment_id}" line="${co.line_no}">

    <div class="comment-wrapp">

  	<div class="meta">

        <div style="float:left"> <img src="${h.gravatar_url(co.author.email, 20)}" /> </div>

  		<div class="user">

  			${co.author.username}

  		</div>

  		<div class="date">

  			${h.age(co.modified_at)}

  		</div>

        %if co.status_change:

           <div  style="float:left" class="changeset-status-container">

             <div style="float:left;padding:0px 2px 0px 2px"><span style="font-size: 18px;">&rsaquo;</span></div>

             <div title="${_('Changeset status')}" class="changeset-status-lbl"> ${co.status_change.status_lbl}</div>

             <div class="changeset-status-ico"><img src="${h.url(str('/images/icons/flag_status_%s.png' % co.status_change.status))}" /></div>             

           </div>

        %endif      

      %if h.HasPermissionAny('hg.admin', 'repository.admin')() or co.author.user_id == c.rhodecode_user.user_id:

        <div class="buttons">

          <span onClick="deleteComment(${co.comment_id})" class="delete-comment ui-btn">${_('Delete')}</span>

        </div>

      %endif

  	</div>

  	<div class="text">

  		${h.rst_w_mentions(co.text)|n}

  	</div>

    </div>

  </div>

</%def>

<%def name="comment_inline_form(changeset)">

<div id='comment-inline-form-template' style="display:none">

  <div class="comment-inline-form ac">

  %if c.rhodecode_user.username != 'default':

    <div class="overlay"><div class="overlay-text">${_('Submitting...')}</div></div>

      ${h.form(h.url('changeset_comment', repo_name=c.repo_name, revision=changeset.raw_id),class_='inline-form')}

      <div class="clearfix">

          <div class="comment-help">${_('Commenting on line {1}.')}

          ${(_('Comments parsed using %s syntax with %s support.') % (

                 ('<a href="%s">RST</a>' % h.url('rst_help')),

          	     ('<span style="color:#003367" class="tooltip" title="%s">@mention</span>' % _('Use @username inside this text to send notification to this RhodeCode user'))

               )

            )|n

           }

          </div>

            <div class="mentions-container" id="mentions_container_{1}"></div>

            <textarea id="text_{1}" name="text" class="yui-ac-input"></textarea>

      </div>

      <div class="comment-button">

      <input type="hidden" name="f_path" value="{0}">

      <input type="hidden" name="line" value="{1}">

      ${h.submit('save', _('Comment'), class_='ui-btn save-inline-form')}

      ${h.reset('hide-inline-form', _('Hide'), class_='ui-btn hide-inline-form')}

      </div>

      ${h.end_form()}

  %else:

      ${h.form('')}

      <div class="clearfix">

          <div class="comment-help">

            ${_('You need to be logged in to comment.')} <a href="${h.url('login_home',came_from=h.url.current())}">${_('Login now')}</a>

          </div>

      </div>

      <div class="comment-button">

      ${h.reset('hide-inline-form', _('Hide'), class_='ui-btn hide-inline-form')}

      </div>

      ${h.end_form()}

  %endif

  </div>

</div>

</%def>

    <div class="comments-number">${ungettext("%d comment", "%d comments", len(c.comments)) % len(c.comments)} ${ungettext("(%d inline)", "(%d inline)", c.inline_cnt) % c.inline_cnt}</div>

    %for path, lines in c.inline_comments:

        % for line,comments in lines.iteritems():

            <div style="display:none" class="inline-comment-placeholder" path="${path}" target_id="${h.safeid(h.safe_unicode(path))}">

            %for co in comments:

                ${comment_block(co)}

            %endfor

            </div>

        %endfor

    %endfor

</%def>

## MAIN COMMENT FORM

<div class="comments">

    <div id="inline-comments-container">

    </div>

    %for co in c.comments:

        <div id="comment-tr-${co.comment_id}">

          ${comment_block(co)}

        </div>

    %endfor

    %if c.rhodecode_user.username != 'default':

    <div class="comment-form ac">

        <strong>${_('Leave a comment')}</strong>

        <div class="clearfix">

            <div class="comment-help">

                ${(_('Comments parsed using %s syntax with %s support.') % (('<a href="%s">RST</a>' % h.url('rst_help')),

          		'<span style="color:#003367" class="tooltip" title="%s">@mention</span>' %

          		_('Use @username inside this text to send notification to this RhodeCode user')))|n}

                | <span class="tooltip" title="${_('Check this to change current status of code-review for this changeset')}"> ${_('change status')}

                  <input style="vertical-align: bottom;margin-bottom:-2px" id="show_changeset_status_box" type="checkbox" name="change_changeset_status" />

                  </span> 

            </div>

            <div id="status_block_container" class="status-block" style="display:none">

                %for status,lbl in c.changeset_statuses:

                    <div class="">

                    </div>                    

                %endfor

            </div>                 

            <div class="mentions-container" id="mentions_container"></div>

             ${h.textarea('text')}

        </div>

        <div class="comment-button">

        ${h.submit('save', _('Comment'), class_='ui-button')}

        </div>

        ${h.end_form()}

    </div>

    %endif

</div>

<script>

YUE.onDOMReady(function () {

   MentionsAutoComplete('text', 'mentions_container', _USERS_AC_DATA, _GROUPS_AC_DATA);

});

</script>

</%def>