Class: Shi::Jekyll::ImageTag

Inherits:
Liquid::Tag
  • Object
show all
Includes:
Tools
Defined in:
lib/shi/jekyll/images/image.rb

Constant Summary collapse

DEFAULT_THUMB_BOUNDS = 
'320'
DEFAULT_WIDTH = 
Shi::Args::Value::Measure::px(320)

Instance Method Summary collapse

Instance Method Details

#clean_path(path) ⇒ Object 



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# File 'lib/shi/jekyll/images/image.rb', line 35

def clean_path path
  path.split(/\/?#/)[0]
end

#render(context) ⇒ Object 



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# File 'lib/shi/jekyll/images/image.rb', line 39

def render context
  args = Shi::Args::Params::parse context, @markup
  extra_args = context['extra_args'] || {}

  source = args[:src] || args[:source]
  if source == nil && Jekyll::StaticFile === args[0]
    source = args[0]
  end
  if !Jekyll::StaticFile === source
    raise ArgumentError, "Invalid source: #{source.inspect}!"
  end

  link = args[:link]
  link = false if args[:no_link]
  link = true if link == nil
  # if link == false only thumbnail needed

  site = context.registers[:site]
  page_path = clean_path(context['page.path'])
  if page_path == nil
    p context.registers[:page]
  end
  page = site.documents.find { |d| d.relative_path == page_path }
  page ||= site.pages.find { |p| p.relative_path == page_path }

  gen_big = false
  href = if link == false # nothing
      nil
    elsif Jekyll::StaticFile === link && !link.write? # uncopyable static file => picture
      bounds = args[:bounds] || extra_args[:bounds]
      Jekyll::PathManager::join '', Shi::Jekyll::Images::File::create(page, link, bounds, nil).url
    elsif link.respond_to?(:url) && link.url # document, page or static file
      Jekyll::PathManager::join '', link.url
    elsif String === link # external link
      link
    elsif link == true # generated big picture
      gen_big = true
      bounds = args[:bounds] || extra_args[:bounds]
      Jekyll::PathManager::join '', Shi::Jekyll::Images::File::create(page, source, bounds, nil).url
    else
      raise ArgumentError, "Invalid link: #{link.inspect}!"
    end

  thumb = args[:thumb]
  thumb = false if args[:no_thumb]
  thumb = true if thumb == nil
  # if thumb == false use full size as thumbnail

  if !gen_big && !thumb
    raise ArgumentError, "You can't disable large image and thumbnail at the same time!"
  end

  src = if thumb
      bounds = thumb_bounds context, args, extra_args
      crop = args[:crop] || extra_args[:crop]
      Shi::Jekyll::Images::File::create(page, source, bounds, crop).url
    else
      href
    end
  src = Jekyll::PathManager::join '', src

  cls = '__image'
  cls += ' ' + args[:class] if args[:class]
  cls += ' ' + extra_args[:class] if extra_args[:class]

  width = args[:width] || extra_args[:width] || DEFAULT_WIDTH

  style = ""
  style += extra_args[:style] if extra_args[:style]
  style += args[:style] if args[:style]

  shape = args[:shape] || extra_args[:shape]
  case shape
  when Jekyll::StaticFile
    shape_url = if shape.write?
        shape.url
      else
        bounds = thumb_bounds context, args, extra_args
        crop = args[:crop] || extra_args[:crop]
        Jekyll::PathManager::join '', Shi::Jekyll::Images::File::create(page, shape, bounds, crop).url
      end
    style += "shape-outside:url(#{shape_url});"
  when String
    cls += " __shape_#{shape}"
  when true
    style += "shape-outside:url(#{src});"
  end

  caption = args[:caption]
  title = args[:title] || caption
  alt = args[:alt] || title
  id = args[:id]

  attrs = "class=\"#{cls}\""
  attrs += " style=\"#{style}\"" if style && !style.empty?
  attrs += " alt=\"#{alt}\"" if alt
  attrs += " title=\"#{title}\"" if title
  attrs += " id=\"#{id}\""

  figure = args[:figure]
  if figure && !extra_args.empty?
    raise ArgumentError, 'Nested figures not allowed!'
  end

  result = ''
  if figure
    fig_class = '__figure __implicit_figure'
    place = args[:place]
    if place == 'right' || args[:right]
      fig_class += ' __right'
    elsif place == 'left' || args[:left]
      fig_class += ' __left'
    else
      fig_class += ' __center'
    end
    fig_class += ' ' + args[:fig_class] if args[:fig_class]
    fig_style = "max-width:#{width.value};"
    fig_style += args[:fig_style] if args[:fig_style]
    case shape
    when Jekyll::StaticFile
      shape_url = if shape.write?
          shape.url
        else
          bounds = thumb_bounds context, args, extra_args
          crop = args[:crop] || extra_args[:crop]
          Jekyll::PathManager::join '', Shi::Jekyll::Images::File::create(page, shape, bounds, crop).url
        end
      fig_style += "shape-outside:url(#{shape_url});"
    when String
      fig_class += " __shape_#{shape}"
    when true
      fig_style += "shape-outside:url(#{src});"
    end
    result += "<figure class=\"#{fig_class}\" style=\"#{fig_style}\" markdown=\"0\">"
  end
  if link != false
    if gen_big
      result += "<a href=\"#{href}\" class=\"__image_link\">"
    else
      result += "<a href=\"#{href}\">"
    end
  end
  # src = Jekyll::PathManager::join '', src
  result += "<img src=\"#{src}\" #{attrs}>"
  if link != false
    result += '</a>'
  end
  if figure
    if caption
      result += "<figcaption markdown=\"span\">#{caption}</figcaption>"
    end
    result += '</figure>'
  end

  result
end

#thumb_bounds(context, args, extra) ⇒ Object 



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# File 'lib/shi/jekyll/images/image.rb', line 25

def thumb_bounds context, args, extra
  bounds = args[:thumb_bounds] || extra[:thumb_bounds]
  width = args[:width] || extra[:width]
  if width && !bounds
    bounds = width_to_bounds width
  end
  bounds ||= lookup_with(context, 'thumb_bounds', ['page', 'layout', 'site.shi_images']) || DEFAULT_THUMB_BOUNDS
  bounds
end

#width_to_bounds(width) ⇒ Object 



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# File 'lib/shi/jekyll/images/image.rb', line 14

def width_to_bounds width
  if Shi::Args::Value::Measure === width
    width.to_px.to_s
  else
    width.to_s
  end
end