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Edit File : README.md \| Size : 2.21 KB
# Getoptlong The GetoptLong class allows you to parse command line options similarly to the GNU getopt_long() C library call. Note, however, that GetoptLong is a pure Ruby implementation. GetoptLong allows for POSIX-style options like <tt>--file</tt> as well as single letter options like <tt>-f</tt> The empty option <tt>--</tt> (two minus symbols) is used to end option processing. This can be particularly important if options have optional arguments. ## Installation Add this line to your application's Gemfile: ```ruby gem 'getoptlong' ``` And then execute: $ bundle Or install it yourself as: $ gem install getoptlong ## Usage ```ruby require 'getoptlong' opts = GetoptLong.new( [ '--help', '-h', GetoptLong::NO_ARGUMENT ], [ '--repeat', '-n', GetoptLong::REQUIRED_ARGUMENT ], [ '--name', GetoptLong::OPTIONAL_ARGUMENT ] ) dir = nil name = nil repetitions = 1 opts.each do \|opt, arg\| case opt when '--help' puts <<-EOF hello [OPTION] ... DIR -h, --help: show help --repeat x, -n x: repeat x times --name [name]: greet user by name, if name not supplied default is John DIR: The directory in which to issue the greeting. EOF when '--repeat' repetitions = arg.to_i when '--name' if arg == '' name = 'John' else name = arg end end end if ARGV.length != 1 puts "Missing dir argument (try --help)" exit 0 end dir = ARGV.shift Dir.chdir(dir) for i in (1..repetitions) print "Hello" if name print ", #{name}" end puts end ``` Example command line: ``` hello -n 6 --name -- /tmp ``` ## Development After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment. To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org). ## Contributing Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/getoptlong. Back

Edit File : README.md | Size : 2.21 KB

# Getoptlong

The GetoptLong class allows you to parse command line options similarly to
the GNU getopt_long() C library call. Note, however, that GetoptLong is a
pure Ruby implementation.

GetoptLong allows for POSIX-style options like <tt>--file</tt> as well
as single letter options like <tt>-f</tt>

The empty option <tt>--</tt> (two minus symbols) is used to end option
processing. This can be particularly important if options have optional
arguments.

## Installation

Add this line to your application's Gemfile:

```ruby
gem 'getoptlong'
```

And then execute:

$ bundle

Or install it yourself as:

$ gem install getoptlong

## Usage

```ruby
require 'getoptlong'

opts = GetoptLong.new(
  [ '--help', '-h', GetoptLong::NO_ARGUMENT ],
  [ '--repeat', '-n', GetoptLong::REQUIRED_ARGUMENT ],
  [ '--name', GetoptLong::OPTIONAL_ARGUMENT ]
)

dir = nil
name = nil
repetitions = 1
opts.each do |opt, arg|
  case opt
    when '--help'
      puts <<-EOF
hello [OPTION] ... DIR
-h, --help:
   show help
--repeat x, -n x:
   repeat x times
--name [name]:
   greet user by name, if name not supplied default is John
DIR: The directory in which to issue the greeting.
      EOF
    when '--repeat'
      repetitions = arg.to_i
    when '--name'
      if arg == ''
        name = 'John'
      else
        name = arg
      end
  end
end

if ARGV.length != 1
  puts "Missing dir argument (try --help)"
  exit 0
end

dir = ARGV.shift

Dir.chdir(dir)
for i in (1..repetitions)
  print "Hello"
  if name
    print ", #{name}"
  end
  puts
end
```

Example command line:

```
hello -n 6 --name -- /tmp
```

## Development

After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/getoptlong.

Back