Class: Jekyll::ThumbTag
- Inherits:
-
Liquid::Tag
- Object
- Liquid::Tag
- Jekyll::ThumbTag
- Defined in:
- lib/jekyll/thumb/tag.rb
Instance Attribute Summary collapse
-
#markup ⇒ Object
Returns the value of attribute markup.
Class Method Summary collapse
Instance Method Summary collapse
- #cache_dir(site) ⇒ Object
- #config(site) ⇒ Object
- #generate_image(site, src, attrs) ⇒ Object
-
#initialize(tag_name, markup, _) ⇒ ThumbTag
constructor
A new instance of ThumbTag.
- #optimize?(site) ⇒ Boolean
- #parse_options(markup, context) ⇒ Object
- #render(context) ⇒ Object
Constructor Details
#initialize(tag_name, markup, _) ⇒ ThumbTag
Returns a new instance of ThumbTag.
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# File 'lib/jekyll/thumb/tag.rb', line 12 def initialize(tag_name, markup, _) @markup = markup super end |
Instance Attribute Details
#markup ⇒ Object
Returns the value of attribute markup.
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# File 'lib/jekyll/thumb/tag.rb', line 6 def markup @markup end |
Class Method Details
.optipng? ⇒ Boolean
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# File 'lib/jekyll/thumb/tag.rb', line 8 def self.optipng? @optinpng ||= system("which optipng") end |
Instance Method Details
#cache_dir(site) ⇒ Object
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# File 'lib/jekyll/thumb/tag.rb', line 49 def cache_dir(site) config(site)['cache'] end |
#config(site) ⇒ Object
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# File 'lib/jekyll/thumb/tag.rb', line 41 def config(site) site.config['thumb'] || {} end |
#generate_image(site, src, attrs) ⇒ Object
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# File 'lib/jekyll/thumb/tag.rb', line 53 def generate_image(site, src, attrs) cache = cache_dir(site) sha = cache && Digest::SHA1.hexdigest(attrs.sort.inspect + File.read(File.join(site.source, src)) + (optimize?(site) ? "optimize" : "")) if sha if File.exists?(File.join(cache, sha)) img_attrs = JSON.parse(File.read(File.join(cache,sha,"json"))) filename = img_attrs["src"].sub(/^\//, '') dest = File.join(site.dest, filename) FileUtils.mkdir_p(File.dirname(dest)) FileUtils.cp(File.join(cache,sha,"img"), dest) site.config['keep_files'] << filename unless site.config['keep_files'].include?(filename) return img_attrs end end original_img_path = File.join(site.source, src) original_img = Vips::Image.new_from_file original_img_path img_attrs = {} if attrs['width'] scale = attrs['width'].to_f / original_img.width attrs['height'] = original_img.height * scale elsif attrs['height'] scale = attrs['height'].to_f / original_img.height attrs['width'] = original_img.width * scale else raise 'must specify either width or height' end img_attrs["height"] = attrs["height"].to_i if attrs["height"] img_attrs["width"] = attrs["width"].to_i if attrs["width"] img_attrs["src"] = src.sub(/(\.\w+)$/, "-#{img_attrs["width"]}w" + '\1') filename = img_attrs["src"].sub(/^\//, '') dest = File.join(site.dest, filename) FileUtils.mkdir_p(File.dirname(dest)) unless File.exist?(dest) thumb = Vips::Image.thumbnail original_img_path, img_attrs["width"] thumb.write_to_file(dest, strip: true) if dest.match(/\.png$/) && optimize?(site) && self.class.optipng? `optipng #{dest}` end end site.config['keep_files'] << filename unless site.config['keep_files'].include?(filename) # Keep files around for incremental builds in Jekyll 3 site.regenerator.add(filename) if site.respond_to?(:regenerator) if sha FileUtils.mkdir_p(File.join(cache, sha)) FileUtils.cp(dest, File.join(cache, sha, "img")) File.open(File.join(cache, sha, "json"), "w") do |f| f.write(JSON.generate(img_attrs)) end end img_attrs end |
#optimize?(site) ⇒ Boolean
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# File 'lib/jekyll/thumb/tag.rb', line 45 def optimize?(site) config(site)['optipng'] end |
#parse_options(markup, context) ⇒ Object
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# File 'lib/jekyll/thumb/tag.rb', line 29 def (markup, context) = {} markup.scan(/(\w+)=((?:"[^"]+")|(?:'[^']+')|[\w\.\_-]+)/) do |key,value| if (value[0..0] == "'" && value[-1..-1]) == "'" || (value[0..0] == '"' && value[-1..-1] == '"') [key] = value[1..-2] else [key] = context[value] end end end |
#render(context) ⇒ Object
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# File 'lib/jekyll/thumb/tag.rb', line 17 def render(context) = (markup, context) return "Bad options to thumb_tag, syntax is: {% thumb_tag src=\"image.png\" width=\"100\"}" unless ["src"] return "Error resizing - can't set both width and height" if ["width"] && ["height"] site = context.registers[:site] img_attrs = generate_image(site, ["src"], ) %Q{<a href="#{['src']}" target="_blank" class="thumb"><img #{.merge(img_attrs).map {|k,v| "#{k}=\"#{v}\""}.join(" ")}></a>} end |