I'm trying to serve a converted file with Rails and I'm not sure what the syntax shoul

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Syntax for serving converted file with Rails? about pandoc-ruby HOT 2 CLOSED

xwmx commented on May 29, 2024

Syntax for serving converted file with Rails?

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Comments (2)

ruinunes commented on May 29, 2024 1

filename = 'somefilename.pdf'
html = "<html><body>Hello <span style='background: yellow; color: red'>world</span></body></html>"
PandocRuby.convert(html, from: :html, o: "#{Rails.root}/tmp/#{filename}")
File.open "#{Rails.root}/tmp/#{filename}", 'rb' do |f|
  send_data f.read, filename: filename, type: 'application/pdf', disposition: :inline
end

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xwmx commented on May 29, 2024

In order to convert to PDF, pandoc uses pdflatex by default and requires specifying an output file:

http://johnmacfarlane.net/pandoc/demo/example19/Creating-a-PDF.html

So, for example, a command like echo "# Some Markdown" | pandoc -o example.pdf could be called via PandocRuby using PandocRuby.convert("# Some Markdown", :o => "example.pdf"), since you can just pass pandoc options as a hash to PandocRuby. Similarly, you could rewrite the example you posted using something like PandocRuby.convert(html, :from => :html, :o => "/tmp/somefilename.pdf").

One thing to note is that there is no error handling or feedback at all about whether the command succeeds.

Also, in case it helps, there are several other options for generating PDF files in Rails:

https://www.ruby-toolbox.com/categories/pdf_generation

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