Class: KeepYourHead::Database::StyleLatex

Inherits:
Style
  • Object
show all
Defined in:
lib/Keepyourhead/style/StyleLatex.rb

Constant Summary collapse

WidthInCm = 
20

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Style

addStyle, getStyle

Constructor Details

#initialize(file) ⇒ StyleLatex

Returns a new instance of StyleLatex.



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 29

def initialize( file )
end

Class Method Details

.Name ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 25

def self.Name
	"latex"
end

Instance Method Details

#compileLatex(baseDirectory, content_latex, options) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 88

def compileLatex(baseDirectory, content_latex, options )
	width = options[:width] || Gdk::Screen.default.width || 10
	
	
	baseDirectory = ::File.expand_path baseDirectory

	directory = Resources::createWorkingDirectory
	compilation = nil
		
	success = true

	filename_tex = "flashcard.tex"
	filename_output = "output.txt"
	filename_tex = ::File.expand_path( filename_tex, directory )
	filename_output = ::File.expand_path( filename_output, directory )

	file_tex = ::File.new(filename_tex, "w")
	file_tex << content_latex
	file_tex.close

	filename_png = 'flashcard_%d.png'
	filename_png = ::File.expand_path filename_png, directory


	sub_id = fork { # fork because of use of FileUtils.cd and concurrency
		success = true
		begin
			Process.setpriority(Process::PRIO_PROCESS, 0, 19)

			FileUtils.cd( directory ) do |dir|

				# latex execution
				FileUtils.cd( baseDirectory ) {
					system( "pdflatex -output-directory='#{directory}' -interaction nonstopmode '#{filename_tex}' >/dev/null")
					success &&= system( "pdflatex -output-directory='#{directory}' -interaction nonstopmode -halt-on-error '#{filename_tex}' 2>&1 >#{filename_output}")
				}

				# ghostscript execution
				dpi = (width / (WidthInCm / 2.54)).to_i

				success &&= system( "gs -dSAFER -dBATCH -dNOPAUSE -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -sDEVICE=png16m -sOutputFile='#{filename_png}' -r#{dpi} flashcard.pdf >> #{filename_output}")
			end
		rescue
			print $!, $!.backtrace, "---"
			success = false
		end
		
		exit! success ? 1 : 0
	}

	pid, status = Process.wait2 sub_id
	success &&= (status.exitstatus == 1)

	filenames = []
	i = 0
	loop do
		filename = filename_png.sub( '%d', i.to_s )
		if ::File.exist? filename then
			filenames << filename 
		else
			break if i > 5
		end

		i += 1
	end

	file_output = ::File.new( filename_output, "r" )
	output = file_output.readlines.join("")
	::File.delete filename_output

	compilation = Compilation.new content_latex, success, output, directory, filenames
	
	if not compilation.success then
		compilation.remove
	end

	compilation
end

#content(type, flashcard, options = {}) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 38

def content(type,flashcard, options = {})
	latex_code( type, flashcard, options )
end

#createImage(type, flashcard, options = {}) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 32

def createImage(type, flashcard, options = {})
	latex = latex_code( type, flashcard, options )
	
	compileLatex ::File.dirname(flashcard.file.filename), latex, options
end

#latex_code(type, flashcard, options = {}) ⇒ Object 



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# File 'lib/Keepyourhead/style/StyleLatex.rb', line 45

def latex_code( type, flashcard, options = {} )
	previewCode = options[:previewCode]
	width = options[:width] || Gdk::Screen.default.width || 10

	assert( type == FRONT || type == BACK )
	ret = case type
		when FRONT
			FrontScheme
		when BACK
			BackScheme
		end.clone

	topics = flashcard.topicNames

	contentFront = flashcard.front
	contentFront ||= topics.last
	contentBack = flashcard.back

	if previewCode then
		case type
		when FRONT
			contentFront = previewCode
		when BACK
			contentBack = previewCode
		end
	end
	
	ret.gsub!( "$(widthInCm)", WidthInCm.to_s )

	ret.gsub!( "$(width)", width.to_s )
	ret.gsub!( "$(header)", flashcard.collection.latexHeader || "" )
	ret.gsub!( "$(type)", flashcard.type || "" )
	ret.gsub!( "$(name)", flashcard.name || "" )
	ret.gsub!( "$(content_front)", contentFront || "" )
	ret.gsub!( "$(content_back)", contentBack || "" )
	ret.gsub!( "$(topics)", topics.join(".") )
	ret.gsub!( "$(prepend)", flashcard.collection.latexPrepend || "" )
	ret.gsub!( "$(append)", flashcard.collection.latexAppend || "" )


	ret
end