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comp.lang.ruby

Passing hashes as command-line parameters

Jeff Leeman

4/16/2009 7:11:00 PM

Is it not possible to pass hashes as command-line arguments to a Ruby
script?

Thanks,
Jeff
--
Posted via http://www.ruby-....
8 Answers

Joel VanderWerf

4/16/2009 7:38:00 PM

0

Jeff Leeman wrote:
> Is it not possible to pass hashes as command-line arguments to a Ruby
> script?

Like ... ?

--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

Jeff Leeman

4/16/2009 8:37:00 PM

0

Well, what I'm looking for is to be able run something like:

ruby script/runner "SomeClassName.method_name({:some_key_1 =>
'some_value_1', :some_key_2 => 'some_value_2', :some_key_3 =>
'some_value_3'})"

Joel VanderWerf wrote:
> Jeff Leeman wrote:
>> Is it not possible to pass hashes as command-line arguments to a Ruby
>> script?
>
> Like ... ?

--
Posted via http://www.ruby-....

Sebastian Hungerecker

4/16/2009 8:43:00 PM

0

Jeff Leeman wrote:
> Well, what I'm looking for is to be able run something like:
>
> ruby script/runner "SomeClassName.method_name({:some_key_1 =>
> 'some_value_1', :some_key_2 => 'some_value_2', :some_key_3 =>
> 'some_value_3'})"

You're perfectly able to run something like that. See:


~> mkdir script
~> cat>script/runner
class SomeClassName
def self.method_name(hash)
p hash
end
end
eval ARGV[0]

~> ruby script/runner "SomeClassName.method_name({:some_key_1
=> 'some_value_1', :some_key_2 => 'some_value_2', :some_key_3
=> 'some_value_3'})"
{:some_key_1=>"some_value_1", :some_key_2=>"some_value_2", :some_key_3=>"some_value_3"}

HTH,
Sebastian

Jeff Leeman

4/16/2009 9:01:00 PM

0

Which OS are you using? Also, are you running this from an IRC prompt
or a standard bash shell?

Thanks,
Jeff


Sebastian Hungerecker wrote:
> Jeff Leeman wrote:
>> Well, what I'm looking for is to be able run something like:
>>
>> ruby script/runner "SomeClassName.method_name({:some_key_1 =>
>> 'some_value_1', :some_key_2 => 'some_value_2', :some_key_3 =>
>> 'some_value_3'})"
>
> You're perfectly able to run something like that. See:
>
>
> ~> mkdir script
> ~> cat>script/runner
> class SomeClassName
> def self.method_name(hash)
> p hash
> end
> end
> eval ARGV[0]
>
> ~> ruby script/runner "SomeClassName.method_name({:some_key_1
> => 'some_value_1', :some_key_2 => 'some_value_2', :some_key_3
> => 'some_value_3'})"
> {:some_key_1=>"some_value_1", :some_key_2=>"some_value_2",
> :some_key_3=>"some_value_3"}
>
> HTH,
> Sebastian

--
Posted via http://www.ruby-....

Sebastian Hungerecker

4/16/2009 9:09:00 PM

0

Jeff Leeman wrote:
> Which OS are you using?

Linux though that should really not make any difference. The ruby code I
posted will work on any platform (though you'd be using something other than
cat to write the code into the file on systems without cat - but then you'd
be doing that anyway, I only used cat so I could copy'n'paste the whole thing
from my bash prompt).

> Also, are you running this from an IRC prompt
> or a standard bash shell?

bash. "~>" is my bash prompt.

Joel VanderWerf

4/16/2009 10:10:00 PM

0

Jeff Leeman wrote:
> Well, what I'm looking for is to be able run something like:
>
> ruby script/runner "SomeClassName.method_name({:some_key_1 =>
> 'some_value_1', :some_key_2 => 'some_value_2', :some_key_3 =>
> 'some_value_3'})"
>
> Joel VanderWerf wrote:
>> Jeff Leeman wrote:
>>> Is it not possible to pass hashes as command-line arguments to a Ruby
>>> script?
>> Like ... ?
>

You could just eval ARGV[0] in this case.

$ ruby -e 'p eval(ARGV[0])' '{:foo => :bar}'
{:foo=>:bar}

--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

Jeff Leeman

4/16/2009 10:29:00 PM

0

Ok, interesting. I'm using a PC, and I tried the exact code that
Sebastian put together, and it runs fine in Cygwin, but does not work in
the command prompt window:

C:\rails_app>jruby script\runner "SomeClassName.method_name({:some_key_1
=> 'some_value_1', :some_key_2 => 'some_value_2'})"
script\runner:6: (eval):1: , unexpected '=' (SyntaxError)

I guess I don't know the command prompt language too well, but there's
probably some special way things have to be delimited with quotes.

-Jeff


Joel VanderWerf wrote:
> Jeff Leeman wrote:
>>> Like ... ?
>>
>
> You could just eval ARGV[0] in this case.
>
> $ ruby -e 'p eval(ARGV[0])' '{:foo => :bar}'
> {:foo=>:bar}

--
Posted via http://www.ruby-....

Sebastian Hungerecker

4/17/2009 8:40:00 AM

0

Jeff Leeman wrote:
> C:\rails_app>jruby script\runner "SomeClassName.method_name({:some_key_1
> => 'some_value_1', :some_key_2 => 'some_value_2'})"
> script\runner:6: (eval):1: , unexpected '=' (SyntaxError)

Try putting p ARGV[0] before the eval and see what that outputs. That way you
can see if and how cmd butchers the argument.