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Slop
====
Slop is a simple option parser with an easy to remember syntax and friendly API.
[](http://travis-ci.org/injekt/slop)
Usage
-----
opts = Slop.parse do
banner "Usage: foo.rb [options]"
on 'name=', 'Your name'
on 'p', 'password', 'An optional password', argument: :optional
on 'v', 'verbose', 'Enable verbose mode'
end
# if ARGV is `--name Lee -v`
opts.verbose? #=> true
opts.password? #=> false
opts[:name] #=> 'lee'
opts.to_hash #=> {:name=>"Lee", :password=>nil, :verbose=>true}
Installation
------------
gem install slop
You can also return your options as a Hash:
opts.to_hash #=> { :name => 'lee', :verbose => true, :password => nil }
Printing Help
-------------
Slop attempts to build a good looking help string to print to your users. You
can see this by calling `opts.help` or simply `puts opts`.
Configuration Options
---------------------
All of these options can be sent to `Slop.new` or `Slop.parse` in Hash form.
* `strict` - Enable strict mode. When processing unknown options, Slop will
raise an `InvalidOptionError`. **default:** *false*.
* `help` - Automatically add the `--help` option. **default:** *false*.
* `banner` - Set this options banner text. **default:** *nil*.
* `ignore_case` - When enabled, `-A` will look for the `-a` option if `-A`
does not exist. **default:** *false*.
* `autocreate` - Autocreate options on the fly. **default:** *false*.
* `arguments` - Force all options to expect arguments. **default:** *false*.
* `optional_arguments` - Force all options to accept optional arguments.
**default:** *false*.
* `multiple_switches` - When disabled, Slop will parse `-abc` as the option `a`
with the argument `bc` rather than 3 separate options. **default:** *true*.
* `longest_flag` - The longest string flag, used to aid configuring help
text. **default:** *0*.
Lists
-----
opts = Slop.parse do
on :l=, as: Array
end
# ruby run.rb -l one,two
opts[:l] #=> ["one", "two"]
# ruby run.rb -l one,two -l three
opts[:l] #=> ["one", "two", "three"]
You can also specify a delimiter and limit.
opts = Slop.parse do
on :l=, as: Array, delimiter: ':', limit: 2
end
# ruby run.rb -l one:two:three
opts[:l] #=> ["one", "two:three"]
Ranges
------
opts = Slop.parse do
on :r=, as: Range
end
# ruby run.rb -r 1..10
opts[:r] #=> 1..10
# ruby run.rb -r 1...10
opts[:r] #=> 1...10
# ruby run.rb -r 1-10
opts[:r] #=> 1..10
# ruby run.rb -r 1,10
opts[:r] #=> 1..10
Autocreate
----------
Slop has an 'autocreate' feature. This feature is intended to create
options on the fly, without having to specify them yourself. In some case,
uses this code could be all you need in your application:
# ruby run.rb --foo bar --baz --name lee
opts = Slop.parse(autocreate: true)
opts.to_hash #=> {:foo=>"bar", :baz=>true, :name=>"lee"}
opts.fetch_option(:name).expects_argument? #=> true
Woah woah, why you hating on OptionParser?
------------------------------------------
I'm not, honestly! I love OptionParser. I really do, it's a fantastic library.
So why did I build Slop? Well, I find myself using OptionParser to simply
gather a bunch of key/value options, usually you would do something like this:
require 'optparse'
things = {}
opt = OptionParser.new do |opt|
opt.on('-n', '--name NAME', 'Your name') do |name|
things[:name] = name
end
opt.on('-a', '--age AGE', 'Your age') do |age|
things[:age] = age.to_i
end
# you get the point
end
opt.parse
things #=> { :name => 'lee', :age => 105 }
Which is all great and stuff, but it can lead to some repetition. The same
thing in Slop:
require 'slop'
opts = Slop.parse do
on :n, :name=, 'Your name'
on :a, :age=, 'Your age', :as => :int
end
opts.to_hash #=> { :name => 'lee', :age => 105 }
|
