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amagical-net
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Description

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

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{Build Status}[https://travis-ci.com/amagical-net/rails-latex]

= Rails-LaTeX

  • Git: https://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/applicationhelper.rb: def lesc(text) LatexToPdf.escapelatex(text) end

app/views/stories/show.html.erb: ... <%= linkto "print", storypath(@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:

<% @latexconfig={:parseruns => 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 +rendertostring+ 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 sendemailmethod output = rendertostring(:template => "/yourmodel/yourview.pdf.erb", :layout => true) MyMailer.emailsender(currentuser, 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 emailsender(user, pdfattachment) @user = user attachments["attachmentname.pdf"] = {:mimetype => '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

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