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- Fixes #1723
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| require 'chunky_png' | ||
| require 'cairo' | ||
| require 'rsvg2' | ||
|
|
||
| module Jekyll | ||
| # Generates social images for blog posts and guides | ||
| module SocialImages | ||
| def social_image(text, page_path) | ||
| # If text is not empty, return it | ||
| if text.nil? || text.empty? | ||
| # If page_path contains "guides/", return the social image path | ||
| if page_path.include?('guides/') | ||
| return "/assets/images/social/#{File.basename(page_path, '.adoc')}.png" | ||
| else | ||
| return "/assets/images/quarkus_card.png" | ||
| end | ||
| else | ||
| text | ||
| end | ||
| end | ||
| end | ||
|
|
||
| class GenerateSocialImagesGenerator < Generator | ||
| def generate(site) | ||
| guides = Dir.glob(File.join(site.source, '_guides', '*.adoc')) | ||
| output_dir = 'assets/images/social' | ||
| FileUtils.mkdir_p(File.join(site.source, output_dir)) | ||
|
|
||
| guides.each do |guide_file| | ||
| basename = File.basename(guide_file, '.adoc') | ||
| if basename.start_with?('_') | ||
| next | ||
| end | ||
| title = extract_title(guide_file) | ||
| output_file = File.join(site.source, output_dir, "#{basename}.png") | ||
| # Skip if the file already exists | ||
| if File.exist?(output_file) | ||
| next | ||
| end | ||
|
|
||
| # Generate the SVG image | ||
| svg_image_str = generate_svg_string(title) | ||
|
|
||
| # Create a Cairo surface and context for the PNG image (must be smaller than 600x330) | ||
| surface = Cairo::ImageSurface.new(Cairo::FORMAT_ARGB32, 600, 250) | ||
| context = Cairo::Context.new(surface) | ||
|
|
||
| # Load and render the SVG onto the Cairo context | ||
| svg = RSVG::Handle.new_from_data(svg_image_str) | ||
| context.render_rsvg_handle(svg) | ||
|
|
||
| # Save the Cairo surface to a PNG file | ||
| b = StringIO.new | ||
| surface.write_to_png(b) | ||
|
|
||
| # Compose the generated image with the template image | ||
| png_image = ChunkyPNG::Image.from_file('_plugins/assets/quarkus_card_blank.png') | ||
| # Change the last parameters to change the position of the generated image | ||
| png_image.compose!(ChunkyPNG::Image.from_blob(b.string), 0, 80) | ||
|
|
||
| Jekyll.logger.info("Generating social image to #{output_file}") | ||
| # Save the composed image to the output file | ||
| png_image.save(output_file) | ||
| end | ||
| end | ||
|
|
||
| def split_text_into_lines(text) | ||
| lines = [] | ||
| words = text.split(' ') | ||
| current_line = '' | ||
|
|
||
| words.each do |word| | ||
| if current_line.length + word.length <= 32 | ||
| current_line += (current_line == '' ? '' : ' ') + word | ||
| else | ||
| lines.push(current_line) | ||
| current_line = word | ||
| end | ||
| end | ||
|
|
||
| lines.push(current_line) unless current_line.empty? | ||
|
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||
| lines | ||
| end | ||
|
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||
| private | ||
|
|
||
| def generate_svg_string(title) | ||
| idx = 90 | ||
| font_size = 30 | ||
| tspan_elements = '' | ||
| split_text_into_lines(title).each_with_index do |line, index| | ||
| tspan_elements += "<tspan x='50%' y='#{idx}'>#{line}</tspan>" | ||
| idx += font_size + 10 | ||
| end | ||
| " | ||
| <svg width=\"600\" height=\"330\"> | ||
| <style> | ||
| .title { fill: white; font-size: #{font_size}px; font-weight: bold; font-family:'Open Sans'} | ||
| </style> | ||
| <text x=\"50%\" y=\"50%\" text-anchor=\"middle\" class=\"title\" > | ||
| #{tspan_elements} | ||
| </text> | ||
| </svg> | ||
| " | ||
| end | ||
|
|
||
| def extract_title(adoc_file) | ||
| title = '' | ||
| File.open(adoc_file, 'r') do |file| | ||
| file.each_line do |line| | ||
| if line.start_with? '=' | ||
| title = line[2..].strip | ||
| break | ||
| end | ||
| end | ||
| end | ||
| title | ||
| end | ||
| end | ||
| end | ||
|
|
||
| Liquid::Template.register_filter(Jekyll::SocialImages) |