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#! /usr/bin/ruby
# :stopdoc:
require 'rbconfig'
require 'optparse'
# http://www.ctan.org/tex-archive/macros/texinfo/texinfo/intl/config.charset
# Fri, 30 May 2003 00:09:00 GMT'
OS = Config::CONFIG["target_os"]
SHELL = Config::CONFIG['SHELL']
class Hash::Ordered < Hash
def [](key)
val = super and val.last
end
def []=(key, val)
ary = fetch(key) {return super(key, [self.size, key, val])} and
ary.last = val
end
def each
values.sort.each {|i, key, val| yield key, val}
end
end
def charset_alias(config_charset, mapfile, target = OS)
map = Hash::Ordered.new
comments = []
match = false
open(config_charset) do |input|
input.find {|line| /^case "\$os" in/ =~ line} or return
input.find {|line|
/^\s*([-\w\*]+(?:\s*\|\s*[-\w\*]+)*)(?=\))/ =~ line and
$&.split('|').any? {|pattern| File.fnmatch?(pattern.strip, target)}
} or return
input.find do |line|
case line
when /^\s*echo "(?:\$\w+\.)?([-\w*]+)\s+([-\w]+)"/
sys, can = $1, $2
can.downcase!
map[can] = sys
false
when /^\s*;;/
true
else
false
end
end
end
case target
when /linux|-gnu/
map.delete('ascii')
when /cygwin/
# get rid of tilde/yen problem.
map['shift_jis'] = 'cp932'
end
writer = proc 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
if mapfile
open(mapfile, "w", &writer)
else
writer[STDOUT]
end
end
target = OS
opt = nil
ARGV.options do |opt|
opt.banner << " config.status map.rb"
opt.on("--target OS") {|t| target = t}
opt.parse! and (1..2) === ARGV.size
end or abort opt.to_s
charset_alias(ARGV[0], ARGV[1], target)
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