switch from python-docutils to ruby-pandoc for rst files

Author: Fuzzwah

Dockerfile

@@ -8,7 +8,7 @@ RUN echo "deb https://dl.bintray.com/nxadm/rakudo-pkg-debs `lsb_release -cs` mai
 RUN apt-get update -qq
 
 RUN apt-get install -y \
-    perl rakudo-pkg curl git build-essential python python-pip \
+    perl rakudo-pkg curl git build-essential \
     libssl-dev libreadline-dev zlib1g-dev \
     libicu-dev cmake pkg-config
 
@@ -18,8 +18,6 @@ RUN install-zef-as-user && zef install Pod::To::HTML
 RUN curl -L http://cpanmin.us | perl - App::cpanminus
 RUN cpanm --installdeps --notest Pod::Simple
 
-RUN pip install docutils
-
 ENV PATH $PATH:/root/.rbenv/bin:/root/.rbenv/shims
 RUN curl -fsSL https://github.com/rbenv/rbenv-installer/raw/master/bin/rbenv-installer | bash
 RUN rbenv install 2.4.1
@@ -28,6 +26,8 @@ RUN rbenv rehash
 
 RUN gem install bundler
 
+RUN dpkg -i https://github.com/jgm/pandoc/releases/download/3.1.12.1/pandoc-3.1.12.1-linux-amd64.tar.gz
+
 WORKDIR /data/github-markup
 COPY github-markup.gemspec .
 COPY Gemfile .

Gemfile

@@ -15,3 +15,4 @@ gem "wikicloth", "=0.8.3"
 gem "twitter-text", "~> 1.14"
 gem "asciidoctor", "~> 2.0.5"
 gem "rake"
+gem "pandoc-ruby", "= 2.1.10"

lib/github/commands/rest2html

@@ -1,6 +1,7 @@
 require "github/markup/markdown"
 require "github/markup/rdoc"
 require "shellwords"
+require 'pandoc-ruby'
 
 markup_impl(::GitHub::Markups::MARKUP_MARKDOWN, ::GitHub::Markup::Markdown.new)
 
@@ -47,13 +48,9 @@
   Asciidoctor.convert(content, :safe => :secure, :attributes => attributes)
 end
 
-command(
-  ::GitHub::Markups::MARKUP_RST,
-  "python3 #{Shellwords.escape(File.dirname(__FILE__))}/commands/rest2html",
-  /re?st(\.txt)?/,
-  ["reStructuredText"],
-  "restructuredtext"
-)
+markup(::GitHub::Markups::MARKUP_RST, :rest2html, /re?st(\.txt)?/, ["reStructuredText"]) do |filename, content, options: {}|
+  PandocRuby.convert(content, :from => 'rst', :to => 'html')
+end
 
 command(::GitHub::Markups::MARKUP_POD6, :pod62html, /pod6/, ["Pod 6"], "pod6")
 command(::GitHub::Markups::MARKUP_POD, :pod2html, /pod/, ["Pod"], "pod")