如何将参数从父任务传递给 Rake 中的子任务? [英] How do I pass arguments from the parent task to the child task in Rake?

问题描述

我正在编写一个 Rake 脚本，它由带参数的任务组成.我想出了如何传递参数以及如何使任务依赖于其他任务.

I am writing a Rake script which consists of tasks with arguments. I figured out how to pass arguments and how to make a task dependent on other tasks.

task :parent, [:parent_argument1, :parent_argument2, :parent_argument3] => [:child1, :child2] do
  # Perform Parent Task Functionalities
end

task :child1, [:child1_argument1, :child1_argument2] do |t, args|
  # Perform Child1 Task Functionalities
end

task :child2, [:child2_argument1, :child2_argument2] do |t, args|
  # Perform Child2 Task Functionalities
end

• 我可以将参数从父任务传递给子任务吗?
• 有没有办法将子任务设为私有，这样它们就不能被独立调用?

推荐答案

我实际上可以想到三种在 Rake 任务之间传递参数的方法.

I can actually think of three ways for passing arguments between Rake tasks.

1. 使用 Rake 对参数的内置支持:

1. Use Rake’s built-in support for arguments:

# accepts argument :one and depends on the :second task.
task :first, [:one] => :second do |t, args|
  puts args.inspect  # => '{ :one => "one" }'
end

# argument :one was automagically passed from task :first.
task :second, :one do |t, args|
  puts args.inspect  # => '{ :one => "one" }'
end

$ rake first[one]

• 通过 Rake::Task#invoke 直接调用任务:

  # accepts arguments :one, :two and passes them to the :second task.
  task :first, :one, :two do |t, args|
    puts args.inspect  # => '{ :one => "1", :two => "2" }'
    task(:second).invoke(args[:one], args[:two])
  end
  
  # accepts arguments :third, :fourth which got passed via #invoke.
  # notice that arguments are passed by position rather than name.
  task :second, :third, :fourth do |t, args|
    puts args.inspect  # => '{ :third => "1", :fourth => "2" }'
  end
  
  $ rake first[1, 2]
  

• 另一种解决方案是对 Rake 的主要应用程序对象进行猴子补丁 Rake::Application
  并用它来存储任意值:

• Another solution would be to monkey patch Rake’s main application object Rake::Application
  and use it to store arbitary values:

  class Rake::Application
    attr_accessor :my_data
  end
  
  task :first => :second do
    puts Rake.application.my_data  # => "second"
  end
  
  task :second => :third do
    puts Rake.application.my_data  # => "third"
    Rake.application.my_data = "second"
  end
  
  task :third do
    Rake.application.my_data = "third"
  end
  
  $ rake first
  

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