optparse and required arguments

[E F van de Laar]

Hi,

I'm playing around with optparse and ran into something I couldn't get
working right off hand. I define two options; both of which require an
argument. I'm using a rescue clause "catch all" to catch options which
do not get an argument passed in. If I pass two of these on the command
line the second option gets passed as an argument to the first. Anyone
have an idea on how to get around this?

The test script and output...

emiel@marvin:~/co/tally> cat test.rb
require 'optparse'

ARGV.options do |opts|
opts.on("-L=LIB", String) { |arg| puts "-L=" +arg }
opts.on("-R=LIB", String) { |arg| puts "-R=" +arg }
begin
opts.parse!
rescue
$stderr.puts "Error: #{$!}\n\n" + opts.to_s
exit 1
end
end

% ruby1.8 test.rb -L -R quux
-L=-R

% ruby1.8 test.rb -L foo -R
-L=foo

Cheers,

Emiel

 

[nobu.nokada]

Hi,

At Sat, 17 Jan 2004 09:12:14 +0900,

I'm playing around with optparse and ran into something I couldn't get
working right off hand. I define two options; both of which require an
argument. I'm using a rescue clause "catch all" to catch options which
do not get an argument passed in. If I pass two of these on the command
line the second option gets passed as an argument to the first. Anyone
have an idea on how to get around this?

If you want -L to get an argument only when next string doesn't
seem an option, use "-L [LIB]".

require 'optparse'

ARGV.options do |opts|

opts.on("-L [LIB]", String) { |arg| puts "-L=#{arg.inspect}" }
opts.on("-R [LIB]", String) { |arg| puts "-R=#{arg.inspect}" }

begin
opts.parse!
rescue
$stderr.puts "Error: #{$!}\n\n" + opts.to_s
exit 1
end
end

% ruby1.8 test.rb -L -R quux

-L=nil
-R="quux"