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# Prince XML Ruby interface.
# http://www.princexml.com
#
# Library by Subimage Interactive - http://www.subimage.com
#
#
# USAGE
# -----------------------------------------------------------------------------
# prince = Prince.new()
# html_string = render_to_string(:template => 'some_document')
# send_data(
# prince.pdf_from_string(html_string),
# :filename => 'some_document.pdf'
# :type => 'application/pdf'
# )
#
class Prince
attr_accessor :exe_path, :style_sheets, :log_file
# Initialize method
#
def initialize()
# Finds where the application lives, so we can call it.
@exe_path = `which prince`.chomp
@style_sheets = ''
@log_file = "log/prince.log"
end
# Sets stylesheets...
# Can pass in multiple paths for css files.
#
def add_style_sheets(*sheets)
for sheet in sheets do
@style_sheets << " -s #{sheet} "
end
end
# Returns fully formed executable path with any command line switches
# we've set based on our variables.
#
def exe_path
# Add any standard cmd line arguments we need to pass
@exe_path << " --input=html --server --log=#{@log_file} "
@exe_path << @style_sheets
return @exe_path
end
# Makes a pdf from a passed in string.
#
# Returns PDF as a stream, so we can use send_data to shoot
# it down the pipe using Rails.
#
def pdf_from_string(string)
path = self.exe_path()
# Don't spew errors to the standard out...and set up to take IO
# as input and output
path << ' --silent - -o -'
# Show the command used...
#logger.info "\n\nPRINCE XML PDF COMMAND"
#logger.info path
#logger.info ''
# Actually call the prince command, and pass the entire data stream back.
pdf = IO.popen(path, "w+")
pdf.puts(string)
pdf.close_write
output = pdf.gets(nil)
pdf.close_read
return output
end
end