require "octopress-include-tag/version"
require "octopress-tag-helpers"
require "jekyll"

module Octopress
  module Tags
    module Include
      class Tag < Liquid::Tag
        PLUGIN_SYNTAX = /(.+?):(\S+)/

        def initialize(tag_name, markup, tokens)
          super
          @og_markup = @markup = markup
        end

        def render(context)
          return unless markup = TagHelpers::Conditional.parse(@markup, context)
          if markup =~ TagHelpers::Var::HAS_FILTERS
            markup = $1
            filters = $2
          end
          markup = TagHelpers::Var.evaluate_ternary(markup, context)
          markup = TagHelpers::Path.parse(markup, context)

          include_tag = Jekyll::Tags::IncludeTag.new('include', markup, [])

          # If markup references a plugin e.g. plugin-name:include-file.html
          if markup.strip =~ PLUGIN_SYNTAX
            plugin = $1
            path = $2
            begin
              content = Octopress::Ink::Plugins.include(plugin, path).read
            rescue => error
              msg = "Include failed: {% #{@tag_name} #{@og_markup}%}.\n"
              if !defined?(Octopress::Ink)
                msg += "To include plugin partials, first install Octopress Ink."
              else
                msg += "The plugin '#{plugin}' does not have an include named '#{path}'."
              end
              raise IOError.new(msg)
            end
            partial = Liquid::Template.parse(content)
            content = context.stack {
              context['include'] = include_tag.parse_params(context)
              context['plugin'] = Octopress::Ink::Plugins.plugin(plugin).config(context['lang'])
              partial.render!(context)
            }.strip
            
          # Otherwise, use Jekyll's default include tag
          else
            content = include_tag.render(context).strip
          end

          unless content.nil? || filters.nil?
            content = TagHelpers::Var.render_filters(content, filters, context)
          end

          content
        end
      end
    end
  end
end

Liquid::Template.register_tag('include', Octopress::Tags::Include::Tag)

if defined? Octopress::Docs
  Octopress::Docs.add({
    name:        "Octopress Include Tag",
    gem:         "octopress-include-tag",
    version:     Octopress::Tags::Include::VERSION,
    description: "Replaces Jekyll's include tag and adds conditional rendering, in-line filters and Octopress Ink features.",
    path:        File.expand_path(File.join(File.dirname(__FILE__), "../")),
    type:        "tag",
    source_url:  "https://github.com/octopress/include-tag"
  })
end