Top Level Namespace

Defined Under Namespace

Modules: Jekyll

Instance Method Summary collapse

Instance Method Details

#check_in_context(context, path) ⇒ Object

Jekyll::Hooks.register [:pages, :posts, :documents], :post_render do |document, payload|

# puts "Post"
# puts document
process_page(document, payload)

end



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# File 'lib/jekyll-img-srcset.rb', line 153

def check_in_context(context, path)
    parts = path.split(".")
    c = context.dup
    parts.each do | part |
        if not c.is_a?(Array) and c.key? part
            c = c[part]
        else
            return nil
        end
    end
    return c
end

#format_image(ident, sizes, original_width, url, caption, title, baseurl, base_image_path) ⇒ Object 



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# File 'lib/jekyll-img-srcset.rb', line 47

def format_image(ident, sizes, original_width, url, caption, title, baseurl, base_image_path)
    srcset = sizes.map {|s| "#{baseurl}/#{base_image_path}/#{s}/#{url} #{s}w"}
    srcset << "#{baseurl}/#{base_image_path}/#{url} #{original_width}w"
    srcset = srcset.join ", "
    classes = "image #{ident[:dimension]} #{ident[:classes].join " "}"
    content = "<div class=\"#{classes}\""
    if not ident[:style].nil?
        content += " style=\"#{ident[:style]}\""
    end
    content += ">"
    content += "<div>"
    srcset_sizes = if sizes.length > 0
        sizes.map do | size |
            "(min-width: #{(size*1.16).floor}) #{size}px"
        end.join(", ") + ", 100vw"
    elsif not ident[:sizes].nil? and ident[:sizes].length > 0
        ident[:sizes]
    else
        "(min-width: 1180px) 1024px, (min-width: 980px) 844px, (min-width: 740px) 640, 100vw"
    end
    if not caption.nil? and caption != ""
        content += "<figure>
            <img
                    src    = \"#{baseurl}/#{base_image_path}/#{sizes[0]}/#{url}\"
                    alt    = \"#{title}\"
                    sizes  = \"#{srcset_sizes}\"
                    srcset = \"#{srcset}\"
            />
            <figcaption>#{caption}</figcaption>
        </figure>"
    else
        content += "<img
            src    = \"#{baseurl}/#{base_image_path}/#{sizes[0]}/#{url}\"
            alt    = \"#{title}\"
            sizes  = \"#{srcset_sizes}\"
            srcset = \"#{srcset}\"
        />"
    end
    content += "</div>"
    content += "</div>"
    return content
end

#format_svg_image(url, ident, title, baseurl, base_image_path) ⇒ Object 



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# File 'lib/jekyll-img-srcset.rb', line 90

def format_svg_image(url, ident, title, baseurl, base_image_path)
    content = "<img "
    if not ident[:style].nil?
        content += "style=\"#{ident[:style]}\" "
    end
    if not ident[:classes].empty?
        content += "class=\"#{ident[:classes].join " "}\" "
    end
    content += "src    = \"#{baseurl}/#{base_image_path}/#{url}\" "
    content += "alt    = \"#{title}\""
    content += "/>"
end

#parse_identifier(ident) ⇒ Object 



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# File 'lib/jekyll-img-srcset.rb', line 23

def parse_identifier(ident)
    i = {
        classes: [],
        sizes: "(min-width: 1180px) 1024px, (min-width: 980px) 844px, (min-width: 740px) 640, 100vw"
    }
    if ident.nil?
        return i
    end

    ident.scan(/#[^\s\}]+|\.[^\s\}]+|[^\s\}]+="[^"]+"/) do | match |
        if match.start_with? "#"
            match[0] = ''
            i[:id] = match
        elsif match.start_with? "."
            match[0] = ''
            i[:classes] << match
        else
            parts = match.split '='
            i[parts[0].to_sym] = parts[1].gsub(/^"/, '').gsub(/"$/, '')
        end
    end
    return i
end

#process_page(document, payload) ⇒ Object 



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# File 'lib/jekyll-img-srcset.rb', line 103

def process_page(document, payload)
    # see https://gist.github.com/mmistakes/77c68fbb07731a456805a7b473f47841
    doc_ext = document.extname.tr('.', '')
    if payload['site']['markdown_ext'].include? doc_ext
        content = document.content
        base_image_path = document.site.config["base_image_path"] || "assets/images"
        image_regex = /!\[(?<caption>.*?)?\]\((?<url>\S+?)(?<title> .+?)?\)(?<identifier>\{.+?\})?/ 
        content = content.gsub(image_regex) do | img |
            img = image_regex.match img
            if (/\.(jpe?g|png)$/i =~ img["url"]).nil?
                "#{base_image_path}/#{img[0]}"
            elsif img["url"].start_with? "http"
                img[0]
            elsif img["url"].end_with? ".svg"
                ident = parse_identifier img[:identifier]
                format_svg_image(img["url"], ident, img["title"],
                    document.site.baseurl)
            else
                if File.exists?(File.join base_image_path, img['url'])
                    widths, original_width = resize_image(img['url'], 
                        document.site.config["widths"],
                        document.site.config["destination"], 
                        base_image_path)
                    document.site.keep_files.concat(widths.map do |w|
                        File.join(base_image_path, "#{w}", img['url'])
                    end)
                    ident = parse_identifier img[:identifier]
                    format_image(ident, widths, original_width,
                        img["url"], img["caption"], img["title"],
                        document.site.baseurl, base_image_path)
                else
                    img[0]
                end
            end
        end
        # puts content
        document.content = content
    end
end

#resize_image(url, widths, dest, base_image_path) ⇒ Object 



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# File 'lib/jekyll-img-srcset.rb', line 3

def resize_image(url, widths, dest, base_image_path)
    image = MiniMagick::Image.open(File.join(base_image_path, url))
    w = image.dimensions[0]
    aspect = image.dimensions[1].to_f / w
    new_widths = widths.select {|x| x <= w}
    new_widths.map do |width| 
        [width, File.join(dest, base_image_path, "#{width}", url)]
    end.select do |width, target| 
        not File.exists? target
    end.each do |width, target|
        image = MiniMagick::Image.open(File.join(base_image_path, url))
        image.resize "#{width}x#{width*aspect}"
        if not Dir.exists? File.dirname(target)
            FileUtils.mkdir_p File.dirname(target)
        end
        image.write target
    end
    return new_widths, w
end