Add messagegroup

Messagegroups are a new kind of group. Every user can join and leave such a
group on her own. They are useful to create topics for mails.

E.g. if there is a weekly newsletter we can create a new messagegroup for
it and every user which is interested in receiving the newsletter can join
the corresponding group.

plugins/messages/app/views/admin/messagegroups/_form.html.haml

@@ -0,0 +1,5 @@
+= simple_form_for [:admin, @messagegroup] do |f|
+  = render 'shared/group_form_fields', :f => f
+  .form-actions
+    = f.button :submit
+    = link_to t('ui.or_cancel'), :back

plugins/messages/app/views/admin/messagegroups/_messagegroups.html.haml

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+- if Messagegroup.count > 20
+  = items_per_page
+= pagination_links_remote @messagegroups
+%table.table.table-striped
+  %thead
+    %tr
+      %th= t '.name'
+      %th= t '.members'
+      %th= t 'ui.actions'
+  %tbody
+    - for messagegroup in @messagegroups
+      %tr
+        %td= link_to messagegroup.name, [:admin, messagegroup]
+        %td= messagegroup.users.size
+        %td
+          = link_to t('ui.edit'), edit_admin_messagegroup_path(messagegroup), class: 'btn btn-mini'
+          = link_to t('ui.delete'), [:admin, messagegroup], :data => {:confirm => t('admin.confirm', name: messagegroup.name)},
+            :method => :delete, class: 'btn btn-mini btn-danger'

plugins/messages/app/views/admin/messagegroups/edit.html.haml

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+- title t '.title'
+
+= render 'form'

plugins/messages/app/views/admin/messagegroups/index.html.haml

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+- title t '.title'
+
+- content_for :actionbar do
+  = link_to t('.new_messagegroup'), new_admin_messagegroup_path, class: 'btn btn-primary'
+
+- content_for :sidebar do
+  %p= t('.first_paragraph', url: link_to(t('.new_messagegroups'), new_admin_messagegroup_path)).html_safe
+.well.well-small
+  = form_tag admin_messagegroups_path, :method => :get, :remote => true,
+    'data-submit-onchange' => true, class: 'form-search' do
+    = text_field_tag :query, params[:query], class: 'input-medium search-query',
+      placeholder: t('admin.search_placeholder')
+#messagegroups
+  = render "messagegroups"

plugins/messages/app/views/admin/messagegroups/index.js.haml

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+$('#messagegroups').html('#{escape_javascript(render("messagegroups"))}');

plugins/messages/app/views/admin/messagegroups/new.html.haml

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+- title t '.title'
+
+= render 'form'

plugins/messages/app/views/admin/messagegroups/show.html.haml

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+- title t '.title', name: @messagegroup.name
+
+%section= render 'shared/group', group: @messagegroup
+= link_to t('ui.edit'), edit_admin_messagegroup_path(@messagegroup), class: 'btn'
+= link_to t('ui.delete'), [:admin, @messagegroup], :data => {:confirm => t('.confirm')}, :method => :delete, class: 'btn btn-danger'
+= link_to t('.send_message'), new_message_path(:message => {:group_id => @messagegroup.id}), class: 'btn'

plugins/messages/app/views/messagegroups/_messagegroup.html.haml

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+%section.well
+  %h3= messagegroup.name
+  = render :partial => 'shared/group', :locals => { :group => messagegroup }
+  = link_to_new_message(message_params: {group_id: messagegroup.id})
+  - if messagegroup.member?(current_user)
+    = link_to t('.leave'), leave_messagegroup_path(messagegroup), class: 'btn', method: :post
+  - else
+    = link_to t('.join'), join_messagegroup_path(messagegroup), class: 'btn', method: :post

plugins/messages/app/views/messagegroups/index.html.haml

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+- title t('.title')
+
+= t('.body').html_safe
+
+= render :partial => "messagegroup", :collection => @messagegroups