require 'rake/clean'

def dia_path_to_pdf_path(diaFile)
  diaFile.pathmap("%{^#{DIADIR},#{FIGURESDIR}}X#{PDFEXT}")
end

PROJECT = 'libjava-esug12'

DIADIR = 'dia'
FIGURESDIR = 'figures'

PDFLATEX = 'pdflatex'
DIA = 'dia'
EPSTOPDF = 'epstopdf'
PDFVIEWER = 'evince'
SPELLCHECKPROG = 'aspell -t check'
BIBTEX = 'bibtex'

DIAEXT = '.dia'
EPSEXT = '.eps'
PDFEXT = '.pdf'
BBLFILE = "#{PROJECT}.bbl"
AUXFILE = "#{PROJECT}.aux"
PDFFILE = "#{PROJECT}.pdf"
DIAFIGURES = FileList['dia/*.dia']
TEXFILES = FileList['*.tex']
BIBFILES = FileList['*.bib']
CONVERTEDDIA = FileList.new.include(DIAFIGURES.collect {|each| dia_path_to_pdf_path(each)})

CLEAN.include(['*.log','*.aux','*.bbl','*.blg','*.lof'])
CLEAN.include(['*.dvi','*.toc','*.out','*.ps', '*.lot'])
CLEAN.include(['*.lol'])
CLEAN.include(CONVERTEDDIA)
CLOBBER.include("#{PROJECT}.pdf")

task :default => [:pdf]

desc "export images, compile bibtex files, generate pdf"
task :all => [:dia, :pdf, :bib ]

desc "generate pdf from #{PROJECT}.tex"
task :pdf => ["#{PROJECT}.pdf"]

file AUXFILE => (TEXFILES + CONVERTEDDIA) do
  build_pdf
end

file BBLFILE => ([ AUXFILE ] + BIBFILES) do
  build_bib
end

file "#{PROJECT}.pdf" => [ AUXFILE, BBLFILE ] + TEXFILES + CONVERTEDDIA do
  build_pdf
  build_pdf
  build_pdf #I'm not sure if its needed, but at least I'm sure index is built completely
end

desc "export dia figures from #{DIADIR}/* to #{FIGURESDIR}/ as #{EPSEXT}"
task :dia => CONVERTEDDIA

DIAFIGURES.each do |each|
  file dia_path_to_pdf_path(each) => [each] do
    build_dia each
  end
end

desc "compile bibtex files"
task :bib do
  build_pdf
  build_bib
  build_pdf
  build_pdf
end

desc "generate pdf and show it"
task :view => [:pdf] do
  sh "#{PDFVIEWER} #{PROJECT}.pdf > /dev/null 2>&1 &"
end

desc "check spelling"
task :spellcheck do
  spellcheck()
end

def build_dia(diaFile) 
  epsFile = diaFile.ext(EPSEXT)
  pdfFile = diaFile.pathmap("%{^#{DIADIR},#{FIGURESDIR}}X#{PDFEXT}")
  sh "#{DIA} #{diaFile} -e #{epsFile}"
  sh "#{EPSTOPDF} #{epsFile} --outfile=\"#{pdfFile}\""
  rm epsFile
end

def build_pdf()
  sh "#{PDFLATEX} #{PROJECT}"
end

def build_bib()
  #hackety hack - mtime granularity in ruby(or linux & ruby) is second
  puts 'sleeping for 2 seconds, because I\'m lazy'
  sleep 2
  sh "#{BIBTEX} #{PROJECT}"
end

def spellcheck() 
  TEXFILES.each do
    |each|
    sh "#{SPELLCHECKPROG} #{each}"
  end
end