charset_alias.rb

# File iconv/charset_alias.rb, line 23
def charset_alias(config_charset, mapfile, target = OS)
  map = Hash::Ordered.new
  comments = []
  IO.foreach("|#{SHELL} #{config_charset} #{target}") do |list|
    next comments << list if /^\#/ =~ list
    next unless /^(\S+)\s+(\S+)$/ =~ list
    sys, can = $1, $2
    can.downcase!
    map[can] = sys
  end
  case target
  when /linux|-gnu/
    map.delete('ascii')
  when /cygwin/
    # get rid of tilde/yen problem.

    map['shift_jis'] = 'cp932'
  end
  open(mapfile, "w") do |f|
    f.puts("require 'iconv.so'")
    f.puts
    f.puts(comments)
    f.puts("class Iconv")
    map.each {|can, sys| f.puts("  charset_map['#{can}'.freeze] = '#{sys}'.freeze")}
    f.puts("end")
  end
end