#!/usr/bin/env ruby
#
# Copyright (c) 2008-2017 Minero Aoki, Kenshi Muto
#               1999-2007 Minero Aoki
#
# This program is free software.
# You can distribute or modify this program under the terms of
# the GNU LGPL, Lesser General Public License version 2.1.
# For details of the GNU LGPL, see the file "COPYING".
#

require 'pathname'

bindir = Pathname.new(__FILE__).realpath.dirname
$LOAD_PATH.unshift((bindir + '../lib').realpath)

require 'review/book'
require 'review/tocparser'
require 'review/tocprinter'
require 'review/version'
require 'optparse'

def main
  @logger = ReVIEW.logger
  Signal.trap(:INT) { exit 1 }
  if RUBY_PLATFORM !~ /mswin(?!ce)|mingw|cygwin|bccwin/
    Signal.trap(:PIPE, 'IGNORE')
  end
  _main
rescue Errno::EPIPE
  exit 0
end

def _main
  yamlfile = 'config.yml'
  printer_class = ReVIEW::TextTOCPrinter
  source = nil
  upper = ReVIEW::TOCPrinter.default_upper_level
  param = {}
  book = ReVIEW::Book::Base.load

  opts = OptionParser.new
  opts.version = ReVIEW::VERSION
  opts.on('--yaml=YAML', 'Read configurations from YAML file.') { |yaml| yamlfile = yaml }
  opts.on('-a', '--all', 'print all chapters.') { source = book }
  opts.on('-p', '--part N', 'list only part N.') do |n|
    source = book.part(Integer(n)) or
      error_exit "part #{n} does not exist in this book"
  end
  opts.on('-c', '--chapter C', 'list only chapter C.') do |c|
    begin
      source = ReVIEW::Book::Part.new(nil, 1, [book.chapter(c)])
    rescue
      error_exit "chapter #{c} does not exist in this book"
    end
  end
  opts.on('-l', '--level N', 'list upto N level (1..4, default=4)') do |n|
    upper = Integer(n)
    unless (0..4).cover?(upper) # 0 is hidden option
      $stderr.puts '-l/--level option accepts only 1..4'
      exit 1
    end
  end
  opts.on('--text', 'output in plain text (default)') { printer_class = ReVIEW::TextTOCPrinter }
  opts.on('--html', 'output in HTML (deprecated)') { printer_class = ReVIEW::HTMLTOCPrinter }
  opts.on('--help', 'print this message and quit.') do
    puts opts.help
    exit 0
  end
  begin
    opts.parse!
  rescue OptionParser::ParseError => err
    @logger.error err.message
    $stderr.puts opts.help
    exit 1
  end

  book.config = ReVIEW::Configure.values
  book.load_config(yamlfile) if yamlfile

  if source
    error_exit '-a/-s option and file arguments are exclusive' unless ARGV.empty?
  else
    puts opts.help
    exit 0
  end

  begin
    printer = printer_class.new(upper, param)
    if source.is_a?(ReVIEW::Book::Part)
      printer.print_part source
    else
      printer.print_book source
    end
  rescue ReVIEW::Error, Errno::ENOENT => err
    raise if $DEBUG
    error_exit err.message
  end
end

def error_exit(msg)
  @logger.error "#{File.basename($PROGRAM_NAME)}: #{msg}"
  exit 1
end

main