feat(messages): render markdown in message body

uses redcarpet gem to render markdown to html. Also a html email template
is added.

Gemfile

@@ -75,6 +75,7 @@ gem 'foodsoft_polls', path: 'plugins/polls'
 # gem 'foodsoft_printer', path: 'plugins/printer'
 # gem 'foodsoft_uservoice', path: 'plugins/uservoice'
 
+
 group :development do
   gem 'sqlite3', '~> 1.3.6'
   gem 'mailcatcher'
@@ -126,3 +127,5 @@ group :test do
   gem 'rswag-specs'
   gem 'hashie', '~> 3.4.6', require: false # https://github.com/westfieldlabs/apivore/issues/114
 end
+
+gem "redcarpet"

Gemfile.lock

@@ -413,6 +413,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    redcarpet (3.6.0)
     redis (5.0.5)
       redis-client (>= 0.9.0)
     redis-client (0.11.2)
@@ -652,6 +653,7 @@ DEPENDENCIES
   rails_tokeninput
   ransack
   recurring_select!
+  redcarpet
   resque
   roo
   roo-xls
@@ -686,4 +688,4 @@ DEPENDENCIES
   whenever
 
 BUNDLED WITH
-   2.4.3
+   2.4.5

app/helpers/application_helper.rb

@@ -263,4 +263,26 @@ module ApplicationHelper
       stylesheet_link_tag foodcoop_css_path, media: 'all'
     end
   end
+
+  # renders html from markdown input
+  def markdown(text)
+    options = {
+        filter_html: true,
+        hard_wrap: true,
+        link_attributes: { rel: 'nofollow', target: "_blank" },
+        fenced_code_blocks: true
+      }
+      extensions = {
+        autolink: true,
+        superscript: true,
+        disable_indented_code_blocks: true,
+        tables: true,
+        strikethrough: true,
+        footnotes: true
+    }
+
+    renderer = ::Redcarpet::Render::HTML.new(options)
+    markdown = ::Redcarpet::Markdown.new(renderer, extensions)
+    markdown.render(text).html_safe
+  end
 end

plugins/messages/app/views/messages/show.haml

@@ -33,7 +33,7 @@
         - if @message.can_toggle_private?(current_user)
           = link_to t('.change_visibility'), toggle_private_message_path(@message), method: :post, class: 'btn btn-mini'
   %hr/
-  %p= simple_format(h(@message.body))
+  = markdown(@message.body)
   %hr/
   %p
     = link_to t('.reply'), new_message_path(:message => {:reply_to => @message.id}), class: 'btn'

plugins/messages/app/views/messages/thread.haml

@@ -9,7 +9,7 @@
     .panel-heading
       %b= h(message.sender_name)
       = format_time(message.created_at)
-    .panel-body= simple_format(h(message.body))
+    .panel-body= markdown(message.body)
 
 %p
   = link_to t('.reply'), new_message_path(:message => {:reply_to => thread_message.id}), class: 'btn'

plugins/messages/app/views/messages_mailer/foodsoft_message.html.haml

@@ -0,0 +1,6 @@
+= markdown(@message.body)
+%hr/
+%pre
+  - if @message.group
+    = raw t '.footer_group', group: @message.group.name
+  = raw t '.footer', reply_url: new_message_url('message[reply_to]' => @message.id), msg_url: message_url(@message), profile_url: my_profile_url