OptionParser Question

Hello all,

I’m using OptionParser to parse command line options. I’ve figured out
how
to handle options for each flag (i.e. opts.on(’–port PORT’)), but I’m
not
sure how to handle command line arguments that aren’t associated with a
flag. For example, say I wanted to parse a file with my file_parser
executable using a certain type of parser. I’d like to say “file_parser
–type CDF <file_name>”. I know how to get the type of parser to use
(see
above), but I’m not so sure how to easily get the name of the file I
want to
parse.

Any suggestions? Thanks! – BTR

Alle Thursday 20 December 2007, Bryan R. ha scritto:

Any suggestions? Thanks! – BTR

Command line arguments (that is, those not associated with an option)
can be obtained in a different way, depending on wheter you use
OptionParser#parse or OptionParser#parse!. The former returns an array
with all the arguments; the second modifies its argument, removing all
the options (and their arguments) and leaving only the command line
arguments. For example:

require ‘optparse’

options= {}
o = OptionParser.new do |o|
o.on(’–type TYPE’, ‘Use TYPE parser’){|t| options[:type]=t}
end

args = o.parse ARGV
puts “The arguments are #{args.inspect}”

If you want to use parse!, replace the last two lines with:

o.parse! ARGV
puts “The arguments are #{ARGV.inspect}”

I hope this helps

Stefano

On Dec 20, 2007, at 12:26 PM, Bryan R. wrote:

“file_parser
–type CDF <file_name>”. I know how to get the type of parser to
use (see
above), but I’m not so sure how to easily get the name of the file
I want to
parse.

Any suggestions? Thanks! – BTR

don’t bother:

  1. gem install main

  2. cat a.rb
    #! /usr/bin/env ruby

Main {

argument(‘file_name’){}

option(‘type’){
argument :required
}

def run
p params[‘file_name’].given?
p params[‘file_name’]
p params[‘type’].given?
p params[‘type’]
end
}

a @ http://codeforpeople.com/

On 20.12.2007 21:20, Stefano C. wrote:

–type CDF <file_name>". I know how to get the type of parser to use (see
o = OptionParser.new do |o|

I hope this helps

The question is, does Bryan want to treat the file name as part of the
option (for example, because there might be multiple occurrences) or
whether it’s simply one of the names to process. You provide a solution
for the latter. A solution for the other variant might be

o.on(’–parse-cdf FILE’, ‘parse file with CDF’) {|file| …}

i.e. pull the type into the option.

Kind regards

robert

Ah yes… this worked great!!! Thanks! – BTR

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