CODEWITHSUNDEEP
rubyrake
tokhi
tokhi

Reputation: 21618

X number of arguments passing to a rake task

I just wonder how to have dynamic (X) number of arguments passing to a rake task. for example I want to achieve this:

rake task:test[arg1,arg2,arg3,...]

So here the number of arguments are not fixed, it could be arg1..arg10 or arg1..arg20 or maybe less/more than this.

any idea?

P.S: I don't want to waste too much memory for this task, thus I'm looking for an optimal solution. Thanks.

Upvotes: 2

Views: 799

Answers (2)

Norbert
Norbert

Reputation: 11

I don't know if you still need this, but here is my solution:

task :test, [:arg] do |t,args|
   arguments = Array.new
   arguments << args.arg
   args.extras.each{|a| arguments << a}
   puts arguments
end

Result: 

rake test[arg1,arg2,arg3,arg4,...]
arg1
arg2
arg3
arg4
...

Upvotes: 1

knut
knut

Reputation: 27845

You can pre-define a maximum number of parameters, but you don't need to use all:

require 'rake'
myargs = 'p1'.upto('p20').map{ |x| x.to_sym }

task :test, myargs do |t, args|
  puts "#{t}: #{args.inspect}"
end

Rake.application[:test].invoke(1,2,3,4,5,6,7,8)

The result:

test: {:p1=>1, :p2=>2, :p3=>3, :p4=>4, :p5=>5, :p6=>6, :p7=>7, :p8=>8}

If you need default values, you can define them:

task :test, myargs do |t, args|
  args.with_defaults(:p19 => 'default1')
  puts "#{t}: #{args.inspect}"
end

Result:

test: {:p19=>"default1", :p1=>1, :p2=>2, :p3=>3, :p4=>4, :p5=>5, :p6=>6, :p7=>7, :p8=>8}

Another way to define parameters witth default values:

myargs = Hash.new{|hash,key| hash[key] = "Default #{key}"}
20.times{|i| myargs[:"p#{i}"] }

task :test, myargs.keys do |t, args|
  args.with_defaults(myargs)
  puts "#{t}: #{args.inspect}"
end

Upvotes: 1

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