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From: Greg Ma on 15 Jun 2010 15:35
Hi,
I can't find out how can I execute my ruby script from another ruby
file.

This is how I would do it in command line
ruby jobs/eventParser.rb "5454353"

Greg
--
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From: Kirk Haines on 15 Jun 2010 15:53
On Tue, Jun 15, 2010 at 1:35 PM, Greg Ma <gregorylepacha(a)msn.com> wrote:
> Hi,
> I can't find out how can I execute my ruby script from another ruby
> file.
>
> This is how I would do it in command line
> ruby jobs/eventParser.rb "5454353"

ri Kernel#system


---------------------------------------------------------- Kernel#system
system(cmd [, arg, ...]) => true or false
------------------------------------------------------------------------
Executes _cmd_ in a subshell, returning +true+ if the command was
found and ran successfully, +false+ otherwise. An error status is
available in +$?+. The arguments are processed in the same way as
for +Kernel::exec+.

system("echo *")
system("echo", "*")

_produces:_

config.h main.rb
*


Kirk Haines

From: Brian Candler on 15 Jun 2010 16:19
Greg Ma wrote:
> I can't find out how can I execute my ruby script from another ruby
> file.
>
> This is how I would do it in command line
> ruby jobs/eventParser.rb "5454353"

system "ruby", "jobs/eventParser.rb", "5454353"

system "ruby jobs/eventParser.rb 5454353"

The latter is less secure since it passes the string to a shell for
splitting into words, and you have to worry about things like quoting,
but it lets you do redirection and shell pipelines, e.g.

system "ruby jobs/eventParser.rb 5454353 2>/dev/null"

However, it may be an idea to try to write your ruby code in such a way
as it could be used directly from the first ruby program. Then it might
become:

require 'jobs/eventParser'
EventParser.new.run("5454353")

This is more efficient because you don't spawn a whole new ruby
interpreter, and becomes even more efficient if you are repeatedly using
the EventParser object.

jobs/eventParser.rb can be written in such a way as it will work both
ways:

class EventParser
def run(args)
...
end
end
if __FILE__ == $0
EventParser.new.run(ARGV)
end

HTH,

Brian.
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