Convert all Mermaid Markdown files (mermaid-*.md) to jpg with white background.

mermaid-to-diagrams.rb

#!/usr/bin/env ruby
def convert_mermaid_md_to_jpg
    Dir["mermaid-*.md"].each do |f|
        slug = f["mermaid-".length...f.length-".md".length]
        command = "~/node_modules/.bin/mmdc -i mermaid-#{slug}.md -o mermaid-#{slug}.png -b '#FFFFFF'"
        puts "Converting mermaid-#{slug}.md to mermaid-#{slug}.png"
        `#{command}`
    end
end

if __FILE__ == $0
    puts "Converts files matching mermaid-*.md to mermaid-*.png"
    puts "If this fails you might need to run:"
    puts "cd ~ && npm install mermaid.cli && popd"
    convert_mermaid_md_to_jpg
end