#!/usr/bin/env ruby
# 2009/05/18
# Snippet to compile a file using nv-metapost.engine or nv-metafun.engine
# To use in Smultron, copy and paste into a command snippet
# (don't forget to set the interpreter to /usr/bin/ruby).

# Try to uncomment the following line if the script does not work correctly
#require 'ftools'

ENGINE='/Users/XXXXXXXXXX/Library/TeXShop/Engines/nv-metapost.engine'
PDFVIEWER='/Applications/TeXShop.app' # Change as needed
TEXBIN='/usr/texbin'
VERBOSE=false # Set to true for debugging purposes
ENV['PATH'] = TEXBIN + ':' + ENV['PATH']
puts 'PATH = ' + ENV['PATH'] if VERBOSE
# Preflight paths
unless (File.exists?(ENGINE))
   puts "Sorry, I cannot find #{ENGINE}."
   puts "Please set the ENGINE variable correctly."
   exit(1)
end
unless (File.exists?(PDFVIEWER))
   puts "Sorry, I cannot find #{PDFVIEWER}"
   puts "Please set the PDFVIEWER variable at the beginning of this code snippet."
   exit(1)
end
unless (File.directory?(File.join(TEXBIN)))
   puts "Sorry, I cannot find the directory #{TEXBIN}."
   puts "Please set the TEXBIN variable at the beginning of this code snippet."
   exit(1)
end
# Ok, we're ready for typesetting
jobpath = %%p # For using from within Smultron
#jobpath = ARGV[0] # For using from the command line
puts "Job path: #{jobpath}" if VERBOSE
workingdir = File.dirname(jobpath)
suffix = File.extname(jobpath)
jobname = File.basename(jobpath, suffix)
puts "Working dir: #{workingdir}" if VERBOSE
puts "Job name: #{jobname}" if VERBOSE
puts "Suffix: #{suffix}" if VERBOSE

if ( system("cd '#{workingdir}'; perl '#{ENGINE}' '#{jobname}#{suffix}' 2>&1") )
   pdf = File.join(workingdir, jobname + '.pdf')
   puts "PDF path: #{pdf}" if VERBOSE 
   if (File.exists?(pdf))
      unless ( system("open -a '#{PDFVIEWER}' '#{pdf}'") )
         puts "An error has occurred on trying to run #{PDFVIEWER} #{pdf}"
      end
   else
      puts "Compilation succeeded, but no pdf has been generated."
   end
else
   puts "Sorry, an error has occurred during compilation :("
end