#1502 Text and Markdown files' preview

app/controllers/dmsf_files_controller.rb

@@ -74,11 +74,18 @@ class DmsfFilesController < ApplicationController
     member = Member.find_by(user_id: User.current.id, project_id: @file.project.id)
     # IE has got a tendency to cache files
     expires_in 0.years, 'must-revalidate' => true
+    # PDF preview
     pdf_preview = (params[:disposition] != 'attachment') && params[:filename].blank? && @file.pdf_preview
     filename = filename_for_content_disposition(@revision.formatted_name(member))
     if pdf_preview.present? && (Setting.plugin_redmine_dmsf['office_bin'].present? || params[:preview].present?)
       basename = File.basename(filename, '.*')
       send_file pdf_preview, filename: "#{basename}.pdf", type: 'application/pdf', disposition: 'inline'
+    # Text preview
+    elsif params[:download].blank? && (@file.size <= Setting.file_max_size_displayed.to_i.kilobyte) &&
+          (@file.text? || @file.markdown? || @file.textile?)
+      @content = File.read(@revision.disk_file, mode: 'rb')
+      render action: 'document'
+    # Offer the file for download
     else
       params[:disposition] = 'attachment' if params[:filename].present?
       send_file @revision.disk_file,

app/helpers/dmsf_files_helper.rb

@@ -27,4 +27,14 @@ module DmsfFilesHelper
         .gsub("\n\n", '<br>')
         .gsub("\n\t", '<br>')
   end
+
+  def render_document_content(dmsf_file, content)
+    if dmsf_file.markdown?
+      render partial: 'common/markup', locals: { markup_text_formatting: markdown_formatter, markup_text: content }
+    elsif dmsf_file.textile?
+      render partial: 'common/markup', locals: { markup_text_formatting: 'textile', markup_text: content }
+    else
+      render partial: 'common/file', locals: { content: content, filename: dmsf_file.name }
+    end
+  end
 end

app/helpers/dmsf_queries_helper.rb

@@ -186,14 +186,15 @@ module DmsfQueriesHelper
           file_view_url = url_for(
             { controller: :dmsf_files, action: 'view', id: item.type == 'file' ? item.id : item.revision_id }
           )
-          content_type = Redmine::MimeType.of(value)
+          content_type = Redmine::MimeType.of(item.filename)
           content_type = 'application/octet-stream' if content_type.blank?
-          tag = link_to(h(value),
+          options = { class: "icon icon-file #{DmsfHelper.filetype_css(item.filename)}",
-                        file_view_url,
+                      'data-downloadurl': "#{content_type}:#{h(value)}:#{file_view_url}" }
-                        target: '_blank',
+          unless previewable?(item.filename, content_type)
-                        rel: 'noopener',
+            options[:target] = '_blank'
-                        class: "icon icon-file #{DmsfHelper.filetype_css(item.filename)}",
+            options[:rel] = 'noopener'
-                        'data-downloadurl': "#{content_type}:#{h(value)}:#{file_view_url}")
+          end
+          tag = link_to h(value), file_view_url, options
           tag = content_tag('span', '', class: 'dmsf-expander') + tag unless filter_any?
         end
         member = Member.find_by(user_id: User.current.id, project_id: item.project_id)
@@ -279,4 +280,13 @@ module DmsfQueriesHelper
     end
     false
   end
+
+  def previewable?(filename, content_type)
+    case content_type
+    when 'text/markdown', 'text/x-textile'
+      true
+    else
+      Redmine::MimeType.is_type?('text', filename) || Redmine::SyntaxHighlighting.filename_supported?(filename)
+    end
+  end
 end

app/models/dmsf_file.rb

@@ -465,7 +465,9 @@ class DmsfFile < ApplicationRecord
   end
 
   def text?
-    Redmine::MimeType.is_type?('text', last_revision&.disk_filename)
+    filename = last_revision&.disk_filename
+    Redmine::MimeType.is_type?('text', filename) ||
+      Redmine::SyntaxHighlighting.filename_supported?(filename)
   end
 
   def image?
@@ -495,6 +497,14 @@ class DmsfFile < ApplicationRecord
     end
   end
 
+  def markdown?
+    Redmine::MimeType.of(last_revision&.disk_filename) == 'text/markdown'
+  end
+
+  def textile?
+    Redmine::MimeType.of(last_revision&.disk_filename) == 'text/x-textile'
+  end
+
   def disposition
     image? || pdf? || video? || html? ? 'inline' : 'attachment'
   end
@@ -504,7 +514,7 @@ class DmsfFile < ApplicationRecord
   end
 
   def previewable?
-    office_doc? && RedmineDmsf::Preview.office_available?
+    office_doc? && RedmineDmsf::Preview.office_available? && size <= Setting.file_max_size_displayed.to_i.kilobyte
   end
 
   # Deletes all previews

app/views/dmsf_files/document.html.erb

@@ -0,0 +1,23 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # 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 2
+  # 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, write to the Free Software
+  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+%>
+
+<%= render layout: 'layouts/document' do %>&nbsp;
+  <%= render_document_content @file, @content %>
+<% end %>

app/views/layouts/_document.html.erb

@@ -0,0 +1,47 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # 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 2
+  # 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, write to the Free Software
+  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+%>
+
+<div class="contextual">
+  <%= link_to "#{l(:button_download)} (#{number_to_human_size(@file.size)})",
+              static_dmsf_file_path(@file, download: @file.last_revision, filename: @file.last_revision.disk_filename),
+              class: 'icon icon-download', disabled: false %>
+</div>
+
+<h2>
+  <%= render partial: '/dmsf/path', locals: { folder: @file.dmsf_folder, filename: @file.title, title: nil } %>
+</h2>
+
+<div class="attachments">
+  <p>
+    <%= @file.description %>
+    <span class="author">
+      <%= link_to_user @file.last_revision.user %>, <%= format_time @file.last_revision.updated_at %>
+    </span>
+  </p>
+</div>
+<div class="filecontent-container">
+  <%= yield %>
+</div>
+
+<% html_title @file.name %>
+
+<% content_for :header_tags do %>
+    <%= stylesheet_link_tag 'scm' %>
+<% end %>

test/helpers/dmsf_queries_helper_test.rb

@@ -42,4 +42,10 @@ class DmsfQueriesHelperTest < RedmineDmsf::Test::HelperTest
     c_size = QueryColumn.new(:size)
     assert_equal '1 KB', csv_value(c_size, @folder1, 1024)
   end
+
+  def test_previewable
+    assert previewable?('file.txt', 'text/plain')
+    assert previewable?('main.c', 'text/x-csrc')
+    assert_not previewable?('document.odt', 'application/vnd.oasis.opendocument.text')
+  end
 end

test/unit/dmsf_file_test.rb

@@ -213,6 +213,8 @@ class DmsfFileTest < RedmineDmsf::Test::UnitTest
     assert @file1.text?
     assert_not @file7.text?
     assert_not @file8.text?
+    @file1.last_revision.disk_filename = 'test.c'
+    assert @file1.text?
   end
 
   def test_pdf
@@ -233,6 +235,18 @@ class DmsfFileTest < RedmineDmsf::Test::UnitTest
     assert @file1.html?
   end
 
+  def test_markdown
+    assert_not @file1.markdown?
+    @file1.last_revision.disk_filename = 'test.md'
+    assert @file1.markdown?
+  end
+
+  def test_textile
+    assert_not @file1.textile?
+    @file1.last_revision.disk_filename = 'test.textile'
+    assert @file1.textile?
+  end
+
   def test_findn_file_by_name
     assert DmsfFile.find_file_by_name(@project1, nil, 'test.txt')
     assert_nil DmsfFile.find_file_by_name(@project1, nil, 'test.ods')