From 5b08241935e8a15c6656c7c62d607f6204e2fa20 Mon Sep 17 00:00:00 2001
From: Simon Courtois <scourtois+github@cubyx.fr>
Date: Tue, 30 Jul 2013 14:56:59 +0200
Subject: [PATCH] Moving all the logic from the helper to the Mustdown module
 (ref #2)

---
 app/helpers/mustdown/mustdown_helper.rb |  31 ++--
 lib/mustdown.rb                         | 219 +++++++++++++++++++++---
 spec/mustdown_spec.rb                   | 112 ++++++++++++
 3 files changed, 325 insertions(+), 37 deletions(-)
 create mode 100644 spec/mustdown_spec.rb

diff --git a/app/helpers/mustdown/mustdown_helper.rb b/app/helpers/mustdown/mustdown_helper.rb
index 9d89e73..172ac05 100644
--- a/app/helpers/mustdown/mustdown_helper.rb
+++ b/app/helpers/mustdown/mustdown_helper.rb
@@ -1,21 +1,28 @@
+# Public: Wrapper class for Mustdown.
+#
+# This module is a Rails helper that provides an easy access to the Mustdown
+# rendering methods.
 module Mustdown
   module MustdownHelper
-    def markdown(content, markdown_extensions = {}, renderer_options = {})
-      md_exts = Mustdown.markdown_extensions.merge(markdown_extensions)
-      renderer_opts = Mustdown.renderer_options.merge(renderer_options)
-
-      renderer = Mustdown.renderer.new(renderer_opts)
-      markdown = Redcarpet::Markdown.new(renderer, md_exts)
-
-      markdown.render(content).html_safe
+    # Public: Calls Mustdown.markdown.
+    #
+    # See Mustdown.markdown.
+    def markdown(*args)
+      Mustdown.markdown(*args).html_safe
     end
 
-    def mustache(template, resource)
-      Mustache.render(template, resource).html_safe
+    # Public: Calls Mustdown.mustache.
+    #
+    # See Mustdown.mustache.
+    def mustache(*args)
+      Mustdown.mustache(*args).html_safe
     end
 
-    def mustdown(template, resource, *markdown_args)
-      markdown mustache(template, resource), *markdown_args
+    # Public: Calls Mustdown.mustdown.
+    #
+    # See Mustdown.mustdown.
+    def mustdown(*args)
+      Mustdown.mustdown(*args).html_safe
     end
   end
 end
diff --git a/lib/mustdown.rb b/lib/mustdown.rb
index a9b1c04..7a3a3ef 100644
--- a/lib/mustdown.rb
+++ b/lib/mustdown.rb
@@ -3,37 +3,206 @@
 require 'redcarpet'
 require 'mustache'
 
-require 'mustdown/engine'
+require 'mustdown/engine' if defined?(Rails)
 
+# Public: Provides a simple way to render markdown, mustache and
+# mustache+markdown templates.
+#
+# Examples
+#
+#   # Rendering a markdown template.
+#   tpl = 'This is **bold** and this is *italic*'
+#   Mustdown.markdown(tpl)
+#   # => '<p>This is <strong>bold</strong> and this is <em>italic</em></p>'
+#
+#   # Rendering a mustache template.
+#   tpl = 'My name is {{name}} and I am {{age}}'
+#   Mustdown.mustache(tpl, name: 'Tom', age: 20)
+#   # => 'My name is Tom and I am 20'
+#
+#   # Rendering a mustache+markdown template.
+#   tpl = '# More about {{name}}'
+#   Mustdown.mustdown(tpl, name: 'Tom')
+#   # => '<h1>More about Tom</h1>'
 module Mustdown
-  class << self
-    attr_accessor :markdown_extensions
-    attr_accessor :renderer_options
-    attr_accessor :renderer
+  extend self
 
-    def configure
-      yield self
-    end
+  # Public: Sets the Hash of markdown extensions.
+  attr_writer :markdown_extensions
 
-    def markdown_extensions
-      @markdown_extensions ||= {
-        no_intra_emphasis:  true,
-        tables:             true,
-        fenced_code_blocks: true,
-        autolink:           true,
-        strikethrough:      true
-      }
-    end
+  # Public: Sets the Hash of markdown renderer options.
+  attr_writer :renderer_options
 
-    def renderer_options
-      @renderer_options ||= {
-        no_styles:        true,
-        safe_links_only:  true
-      }
-    end
+  # Public: Sets the markdown renderer (a Redcarpet compatible renderer).
+  #
+  # Note: It accepts a class or an instance.
+  attr_writer :markdown_renderer
+
+  # Public: Provides a way to configure Mustdown.
+  #
+  # Yields itself.
+  #
+  # Examples
+  #
+  #   # Configuring Mustdown
+  #   Mustdown.configure do |config|
+  #     config.markdown_renderer = MyCustomRenderer
+  #   end
+  #
+  # Returns nothing.
+  def configure
+    yield self
+  end
+
+  # Public: Returns the default markdown extensions
+  #
+  # Returns a Hash.
+  def markdown_extensions
+    @markdown_extensions ||= {
+      no_intra_emphasis:  true,
+      tables:             true,
+      fenced_code_blocks: true,
+      autolink:           true,
+      strikethrough:      true
+    }
+  end
+
+  # Public: Returns the default markdown renderer options
+  #
+  # Returns a Hash.
+  def renderer_options
+    @renderer_options ||= {
+      no_styles:        true,
+      safe_links_only:  true
+    }
+  end
+
+  # Public: Returns the markdown renderer.
+  #
+  # This can be a class or an object. When it's a class, a new instance will be
+  # created when rendering.
+  #
+  # Defaults to Redcarpet::Render::HTML
+  #
+  # Returns an Object.
+  def markdown_renderer
+    @markdown_renderer ||= Redcarpet::Render::HTML
+  end
+
+  # Deprecated:  Returns the markdown renderer.
+  #
+  # Use markdown_renderer instead.
+  #
+  # Returns an Object.
+  def renderer
+    warn "Mustdown.renderer is deprecated. Use Mustdown.markdown_renderer instead."
+    self.markdown_renderer
+  end
+
+  # Deprecated: Sets the markdown renderer
+  #
+  # Use markdown_renderer= instead.
+  #
+  # Returns nothing.
+  def renderer=(value)
+    warn "Mustdown.renderer= is deprecated. Use Mustdown.markdown_renderer= instead."
+    self.markdown_renderer = value
+  end
+
+  # Public: Renders a markdown template.
+  #
+  # template            - The String template containing markdown template.
+  # markdown_extensions - A Hash of additional extensions that will be merged
+  #                       with the default ones.
+  # renderer_options    - A Hash of additional markdown renderer options that
+  #                       will be merged with the default ones.
+  #
+  # Examples
+  #
+  #    tpl = '# Hello world'
+  #    Mustdown.markdown(tpl)
+  #    # => '<h1>Hello world</h1>'
+  #
+  #    tpl = 'http://example.com [example](http://example.com)'
+  #    Mustdown.markdown(tpl, autolink: false)
+  #    # => '<p>http://example.com <a href="http://example.com">example</a></p>'
+  #
+  #    tpl = 'http://example.com [example](http://example.com)'
+  #    Mustdown.markdown(tpl, { autolink: false }, { no_links: true })
+  #    # => '<p>http://example.com [example](http://example.com)</p>'
+  #
+  # Returns the rendered markdown String.
+  def markdown(template, markdown_extensions = {}, renderer_options = {})
+    exts = markdown_extensions.merge(markdown_extensions)
+    opts = renderer_options.merge(renderer_options)
+
+    renderer = markdown_renderer.new(opts)
+    markdown = Redcarpet::Markdown.new(renderer, exts)
+
+    markdown.render(template)
+  end
+
+  # Public: Renders a mustache template.
+  #
+  # template - The String template containing mustache template.
+  # resource - The Hash or Object used as binding for the template.
+  #
+  # Examples
+  #
+  #    tpl = 'Hello {{name}}'
+  #    Mustdown.mustache(tpl, name: 'Tom')
+  #    # => 'Hello Tom'
+  #
+  #    tpl = 'Hello {{name}}'
+  #    user = User.find(1) # A user named Tom
+  #    Mustdown.mustache(tpl, user)
+  #    # => 'Hello Tom'
+  #
+  # Returns the rendered mustache String.
+  def mustache(template, resource)
+    Mustache.render(template, resource)
+  end
+
+  # Public: Renders a mustache+markdown template.
+  #
+  # template      - The String template containing mustache+markdown template.
+  # resource      - The Hash or Object used as binding for the template.
+  # markdown_args - Zero, one or two Hash objects that will be passed to the
+  #                 markdown method.
+  #
+  # Examples
+  #
+  #    tpl = '# Hello {{name}}'
+  #    Mustdown.mustdown(tpl, name: 'Tom')
+  #    # => '<h1>Hello Tom</h1>'
+  #
+  #    tpl = '{{url}}'
+  #    website = { url: 'http://example.com' }
+  #    Mustdown.markdown(tpl, website, autolink: false)
+  #    # => '<p>http://example.com</p>'
+  #
+  #    tpl = '[{{title}}]({{url}})'
+  #    website = { title: 'Example', url: 'http://example.com' }
+  #    Mustdown.markdown(tpl, website, { autolink: false }, { no_links: true })
+  #    # => '<p>[Example](http://example.com)</p>'
+  #
+  # Returns the rendered mustache+arkdown String.
+  def mustdown(template, resource, *markdown_args)
+    markdown mustache(template, resource), *markdown_args
+  end
 
-    def renderer
-      @renderer ||= Redcarpet::Render::HTML
+  # Private: Outputs a warning message.
+  #
+  # In a Rails app uses Rails.logger, $stderr otherwise.
+  #
+  # message - The String message to display as a warning.
+  #
+  # Returns nothing.
+  def warn(message)
+    if defined?(Rails)
+      Rails.logger.warn message
+    else
+      $stderr.puts "WARNING: #{message}"
     end
   end
 end
diff --git a/spec/mustdown_spec.rb b/spec/mustdown_spec.rb
new file mode 100644
index 0000000..1163eb8
--- /dev/null
+++ b/spec/mustdown_spec.rb
@@ -0,0 +1,112 @@
+require 'spec_helper'
+
+class MustdownIncluder
+  include Mustdown
+end
+
+shared_examples_for "Mustdown" do
+  let(:binding_object) do
+     { name: "test" }
+  end
+
+  describe "configure" do
+    it "yields with subject as argument" do
+      subject.configure { |c| c.markdown_extensions = "configure" }
+      subject.markdown_extensions.should eq("configure")
+    end
+  end
+
+  describe "markdown_extensions=" do
+    it "sets the markdown extensions of subject" do
+      subject.markdown_extensions = "extensions"
+      subject.markdown_extensions.should eq("extensions")
+    end
+  end
+
+  describe "renderer_options=" do
+    it "sets the markdown renderer options of subject" do
+      subject.renderer_options = "options"
+      subject.renderer_options.should eq("options")
+    end
+  end
+
+  describe "markdown_renderer=" do
+    it "sets the markdown renderer of subject" do
+      subject.markdown_renderer = "md renderer"
+      subject.markdown_renderer.should eq("md renderer")
+    end
+  end
+
+  describe "markdown" do
+    it "process a template into HTML" do
+      output = subject.markdown('# Test')
+      output.should eq("<h1>Test</h1>\n")
+    end
+
+    it "uses configured renderer class" do
+      rndr_class = Class.new(Redcarpet::Render::HTML) do
+        def header(*args); super; end
+      end
+
+      rndr = rndr_class.new
+      rndr_class.stub(:new).and_return(rndr)
+
+      subject.markdown_renderer = rndr_class
+
+      rndr.should_receive(:header)
+      subject.markdown('# Test')
+    end
+
+    context "when overriding autolink to true" do
+      it "generates autolinks" do
+        output = subject.markdown("http://test.com", { autolink: true })
+        output.should match(/<a /)
+      end
+    end
+
+    context "when overriding autolink to false" do
+      it "doesn't generate any autolink" do
+        output = subject.markdown("http://test.com", { autolink: false })
+        output.should_not match(/<a /)
+      end
+    end
+
+    context "when overriding no_links to true" do
+      it "doesn't generate any link" do
+        output = subject.markdown("[a](test)", {}, { no_links: true })
+        output.should_not match(/<a /)
+      end
+    end
+
+    context "when overriding no_links to false" do
+      it "doesn't generate any link" do
+        output = subject.markdown("[a](test)", {}, { no_links: false })
+        output.should match(/<a /)
+      end
+    end
+  end
+
+  describe "mustache" do
+    it "passes the binding object to the template" do
+      output = subject.mustache("{{name}}", binding_object)
+      output.should eq("test")
+    end
+  end
+
+  describe "mustdown" do
+    it "renders mustache and then markdown" do
+      output = subject.mustdown("# {{name}}", binding_object)
+      output.should eq("<h1>test</h1>\n")
+    end
+  end
+end
+
+describe Mustdown do
+  subject { Mustdown.dup }
+  it_behaves_like "Mustdown"
+end
+
+describe MustdownIncluder do
+  subject { MustdownIncluder.new }
+  it_behaves_like "Mustdown"
+end