ruby命令行解析
可用库:getoptlong.rs, optionparser
对应类:GetoptLong, OptionParser
前者已过时,建议使用后者,且后者比前者易用。
后者特点:
1. 参数描述和代码处理写在一起
2. 输出参数说明,不需单独维护
3. 可选参数和命令参数描述简洁
4. 参数可自动转换为特定的类
5. 参数可限制在某个集合中
**************************************************************************
**************API(1.8.6)中的例子: example.rb**********************
require 'optparse'
require 'optparse/time'
require 'ostruct'
require 'pp'
class OptparseExample
CODES = %w[iso-2022-jp shift_jis euc-jp utf8 binary]
CODE_ALIASES = { "jis" => "iso-2022-jp", "sjis" => "shift_jis" }
#
# Return a structure describing the options.
#
def self.parse(args)
# The options specified on the command line will be collected in *options*. 命令行的选项在options结构体中
# We set default values here.
options = OpenStruct.new
options.library = []
options.inplace = false
options.encoding = "utf8"
options.transfer_type = :auto
options.verbose = false
opts = OptionParser.new do |opts|
opts.banner = "Usage: example.rb [options]"
opts.separator ""
opts.separator "Specific options:"
# Mandatory argument.
opts.on("-r", "
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