如何使用Ruby的optparse解析不带名称的参数 [英] How to parse an argument without a name with Ruby's optparse

问题描述

我需要像这样解析命令行

I need to parse a command line like

  script.rb <mandatory filename> [options]

使用 optparse .

确定我可以编写一些自定义代码来处理文件名，然后将ARGV传递给optparse，但是也许有更简单的方法来做到这一点?

Sure I can write some custom code to handle the filename, then pass ARGV to optparse, but maybe there's a simpler way to do it?

还有另一种破解此类命令行的方法，那就是将['--mandatory-filename'] + ARGV传递给optparse，然后处理--mandatory-filename选项.

there's another hacky way to parse such a command line, and that is pass ['--mandatory-filename'] + ARGV to optparse, then handle the --mandatory-filename option.

推荐答案

首先使用optparse parse!，然后扫描ARGV并提高ARGV是否为空.像这样:

First parse! with optparse, then scan the ARGV and raise if ARGV is empty. Like so:

op.parse!
filename = ARGV.pop
raise "Need to specify a file to process" unless filename

强制性文件名将不被OptionParser处理，而是留在ARGV中供您使用-如果不存在，请手动提高.

The mandatory filename will not be processed by the OptionParser and will be left for you in ARGV - if it's not there, just raise manually.

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