Adds experimental support for Markdown formatting with redcarpet (#15520).

git-svn-id: http://svn.redmine.org/redmine/trunk@12452 e93f8b46-1217-0410-a6f0-8f06a7374b81

2 files changed, 181 insertions, 0 deletions

diff --git a/lib/redmine/wiki_formatting/markdown/formatter.rb b/lib/redmine/wiki_formatting/markdown/formatter.rb
new file mode 100644
index 000000000..19ee46693
--- /dev/null
+++ b/lib/redmine/wiki_formatting/markdown/formatter.rb
@@ -0,0 +1,136 @@
+# Redmine - project management software
+# Copyright (C) 2006-2013  Jean-Philippe Lang
+#
+# 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.
+
+require 'cgi'
+
+module Redmine
+  module WikiFormatting
+    module Markdown
+      class HTML < Redcarpet::Render::HTML
+        include ActionView::Helpers::TagHelper
+
+        def link(link, title, content)
+          css = nil
+          unless link && link.starts_with?('/')
+            css = 'external'
+          end
+          content_tag('a', content.html_safe, :href => link, :title => title, :class => css)
+        end
+
+        def block_code(code, language)
+          if language.present?
+            "<pre><code class=\"#{CGI.escapeHTML language} syntaxhl\">" +
+              Redmine::SyntaxHighlighting.highlight_by_language(code, language) +
+              "</code></pre>"
+          else
+            "<pre>" + CGI.escapeHTML(code) + "</pre>"
+          end
+        end
+      end
+
+      class Formatter
+        def initialize(text)
+          @text = text
+        end
+
+        def to_html(*args)
+          html = formatter.render(@text)
+          # restore wiki links eg. [[Foo]]
+          html.gsub!(%r{\[<a href="(.*?)">(.*?)</a>\]}) do
+            "[[#{$2}]]"
+          end
+          # restore Redmine links with double-quotes, eg. version:"1.0"
+          html.gsub!(/(\w):&quot;(.+?)&quot;/) do
+            "#{$1}:\"#{$2}\""
+          end
+          html
+        end
+
+        def get_section(index)
+          section = extract_sections(index)[1]
+          hash = Digest::MD5.hexdigest(section)
+          return section, hash
+        end
+
+        def update_section(index, update, hash=nil)
+          t = extract_sections(index)
+          if hash.present? && hash != Digest::MD5.hexdigest(t[1])
+            raise Redmine::WikiFormatting::StaleSectionError
+          end
+          t[1] = update unless t[1].blank?
+          t.reject(&:blank?).join "\n\n"
+        end
+
+        def extract_sections(index)
+          sections = ['', '', '']
+          offset = 0
+          i = 0
+          l = 1
+          inside_pre = false
+          @text.split(/(^(?:.+\r?\n\r?(?:\=+|\-+)|#+.+|~~~.*)\s*$)/).each do |part|
+            level = nil
+            if part =~ /\A~{3,}(\S+)?\s*$/
+              if $1
+                if !inside_pre
+                  inside_pre = true
+                end
+              else
+                inside_pre = !inside_pre
+              end
+            elsif inside_pre
+              # nop
+            elsif part =~ /\A(#+).+/
+              level = $1.size
+            elsif part =~ /\A.+\r?\n\r?(\=+|\-+)\s*$/
+              level = $1.include?('=') ? 1 : 2
+            end
+            if level
+              i += 1
+              if offset == 0 && i == index
+                # entering the requested section
+                offset = 1
+                l = level
+              elsif offset == 1 && i > index && level <= l
+                # leaving the requested section
+                offset = 2
+              end
+            end
+            sections[offset] << part
+          end
+          sections.map(&:strip)
+        end
+
+        private
+
+        def formatter
+          @@formatter ||= Redcarpet::Markdown.new(
+            Redmine::WikiFormatting::Markdown::HTML.new(
+              :filter_html => true,
+              :hard_wrap => true
+            ),
+            :autolink => true,
+            :fenced_code_blocks => true,
+            :space_after_headers => true,
+            :tables => true,
+            :strikethrough => true,
+            :superscript => true
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/lib/redmine/wiki_formatting/markdown/helper.rb b/lib/redmine/wiki_formatting/markdown/helper.rb
new file mode 100644
index 000000000..2619cb71e
--- /dev/null
+++ b/lib/redmine/wiki_formatting/markdown/helper.rb
@@ -0,0 +1,45 @@
+# Redmine - project management software
+# Copyright (C) 2006-2013  Jean-Philippe Lang
+#
+# 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.
+
+module Redmine
+  module WikiFormatting
+    module Markdown
+      module Helper
+        def wikitoolbar_for(field_id)
+          heads_for_wiki_formatter
+          javascript_tag("var wikiToolbar = new jsToolBar(document.getElementById('#{field_id}')); wikiToolbar.draw();")
+        end
+
+        def initial_page_content(page)
+          "# #{@page.pretty_title}"
+        end
+
+        def heads_for_wiki_formatter
+          unless @heads_for_wiki_formatter_included
+            content_for :header_tags do
+              javascript_include_tag('jstoolbar/jstoolbar') +
+              javascript_include_tag('jstoolbar/markdown') +
+              javascript_include_tag("jstoolbar/lang/jstoolbar-#{current_language.to_s.downcase}") +
+              stylesheet_link_tag('jstoolbar')
+            end
+            @heads_for_wiki_formatter_included = true
+          end
+        end
+      end
+    end
+  end
+end