# coding: utf-8
# Rakefile for Markdown documents.

DIRMAP_MD = '.dirmap.md'
ENCODING = "UTF-8"
HTML2PDF = "wkhtmltopdf"
TEX2IMAGE = "tex2image"
HTML2PDF_OPTIONS = "-B 1cm -L 1.5cm -R 1.5cm -T 1.5cm -s A4 --encoding #{ENCODING} "
CONVERT_COMMAND = "convert -alpha deactivate -density 150x150"

require "pp"
require "fileutils"
require "pathname"

## .dirmap.md
# dirmap コマンドは必ず実行なので task タスク。
# これを file にすると存在するときに実行されない。
# 生成物の .dirmap.md から task タスクへの依存を設定すると、
# .dirmap.md に依存する file タスクに「必ず実行」が伝播して必ず実行になってしまう。
# DIRMAP_MD というファイルに対する file タスクへの依存として扱うことで、
# .dirmap.md に依存する file タスクに「必ず実行」が伝播するのを防いでいる。
desc "update .dirmap.md if directory changed."
file DIRMAP_MD => :dirmap_command
task :dirmap_command do
  sh "dirmap"
end

## *.html
md_files = FileList["*.md"]
html_files = md_files.ext("html")
html_tasks = []
html_files.each do |html_file|
  md_file = html_file.ext("md")
  md_path = Pathname.new( md_file)
  dirpath = md_path.dirname
  src = FileList[md_file, DIRMAP_MD]
  file html_file => [DIRMAP_MD, md_file] do
    sh "madowu -O -s .dirmap.md -c madowu.css -C UTF-8 #{md_file}"
  end
  html_tasks << html_file
end

desc "make *.html from *.md"
task :md2html => [DIRMAP_MD, * html_tasks]


desc "make *.pdf from *.html"
pdf_files = html_files.ext("pdf")
task :html2pdf => FileList[pdf_files]
pdf_files.each do |pdf_file|
  html_file = pdf_file.ext("html")
  file pdf_file => html_file do
    sh "#{HTML2PDF} #{HTML2PDF_OPTIONS} #{html_file} #{pdf_file}"
  end
end


desc "make .png from .eps."
eps_files = FileList["*.eps"]
png_files = eps_files.ext("png")
task :eps2png => FileList[png_files]
png_files.each do |png_file|
    eps_file = png_file.ext("eps")
    t = [eps_file]
    file png_file => t do
        sh "#{CONVERT_COMMAND} #{eps_file} #{png_file}"
    end
end


desc "make *.png from *.tex"
tex_files = FileList["*.tex"]
png_files = tex_files.ext("png")
task :tex2png => FileList[png_files]
png_files.each do |png_file|
  tex_file = png_file.ext("tex")
  file png_file => tex_file do
    #pp png_file, tex_file; exit
    sh "#{TEX2IMAGE} #{tex_file}"
  end
end


# recursive だと、サブディレクトリの Rakefile も
# recursive ターゲットを持っているという前提が必要。
desc "execute 'rake' in all subdirs with Rakefile"
rakefiles = FileList["**/Rakefile"]
dirs = rakefiles.map{|path| Pathname.new(path).dirname.to_s}
dirs.delete_if {|i| i == '.' } 
dirs.map!{|path| File.absolute_path(path)}
task :subdir do
  dirs.each do |dir|
    Dir.chdir dir
    system "rake"
  end
end

task :all => [:md2html, :subdir]

task :pdf => :html2pdf
#task :default => [:tree, :tex2png, :eps2png]
task :default => [:md2html, :tex2png, :eps2png]

require "rake/clean"
CLEAN.include( [
  html_files,
  pdf_files,
])