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Rails-LaTeX¶ ↑

• Git: github.com/baierjan/rails-latex

• Original author: Geoff Jacobsen

• Copyright: 2010-2015 Geoff Jacobsen, Jan Baier and contributors

• License: MIT-LICENSE

Description¶ ↑

rails-latex is a renderer for rails, which allows tex files with erb to be turned into an inline pdf.

Synopsis¶ ↑

app/helpers/application_helper.rb:

def lesc(text)
  LatexToPdf.escape_latex(text)
end

app/views/stories/show.html.erb:

...
<%= link_to "print", story_path(@story,:format => :pdf) %>

app/views/stories/show.pdf.erb:

...
<%= lesc @story.name % >

app/views/layouts/application.pdf.erbtex:

\documentclass[12pt,a4paper,sloppy,< %= @landscape % >]{article}
...
< %= yield % >
\end{document}

config/initializers/mime_types.rb:

...
Mime::Type.register "application/pdf", :pdf, ['text/pdf'], ['pdf']

Only the file containing the \documentclass should be of type: .pdf.erbtex . Partials and views (when there is a layout) should be of type .pdf.erb .

If a LaTeX package requires more than one parser run add the following to the .pdf.erbtex file:

<% @latex_config={:parse_runs => 3} %>

You can override the defaults like so:

LatexToPdf.config.merge! :command => 'xetex', :arguments => ['-etex'], :parse_runs => 2

or to change just the arguments:

LatexToPdf.config[:arguments].delete('-halt-on-error')

The defaults are:

command: 'pdflatex'
arguments: ['-halt-on-error']
parse_runs: 1

The last log file is moved to tmp/rails-latex/input.log , and the corresponding source TeX file to tmp/rails-latex/input.tex . If the PDF is not produced the build directory is not removed; an archive script should be written to occasionally clean up the tmp/rails-latex directory.

See the rails application under examples/rails-latex-demo/ for a working example.

Generating a String¶ ↑

If you need to generate the LaTeX document as a string you can use the render_to_string method. You will probably need to pass the :layout => true option to invoke the PDF generator. Here is an example to generate an email attachment:

In the controller you will have something along the lines of:

def send_email_method
  output = render_to_string(:template => "/your_model/your_view.pdf.erb", :layout => true)
  MyMailer.email_sender(current_user, output).deliver
end

The thing to note is the :layout => true which is needed so that the pdf template can grab the application erbtex layout. Then in your mailer:

def email_sender(user, pdf_attachment)
  @user = user
  attachments["attachment_name.pdf"] = {:mime_type => 'application/pdf', :content => pdf_attachment}
  mail( .... )
end

Exception handling and debugging¶ ↑

When LaTeX render fails, RailsLatex::ProcessingError is thrown. In your code, you can catch it and react according to your needs. To make your life easier, TeX source and log are attached to the exception as instance variables src and log.

Requirements¶ ↑

• ruby 1.8 or 1.9

• rails 3 or later

Install¶ ↑

• gem install rails-latex

Development¶ ↑

Developing rails-latex requires bundler and RedCloth

• rake test

• rake build

Contributions¶ ↑

• Geoff Jacobsen

• Tommaso Patrizi

• Klaus Reske

• Jan Baier

• Jakub Cerny