如何使用 rake 命令在命名空间的每个任务上运行函数

Question

我想在命名空间中的每个 rake 任务上运行一个简单的函数 Enter_to_continue 。 目前我在每个任务的末尾添加该函数

，但是，这似乎是多余的，有没有办法通过进行一些元编程来运行这个函数，enter_to_continue，在命名空间“mytest”的每个任务的末尾自动运行？

namespace :mytest do
  task :foo do
    system "date"
    enter_to_continue
  end

  task :bar do 
    system "ls"
    enter_to_continue
  end

  # ...
  # Let's say 10 more tasks ends with enter_to_continue comes after 
  # ...
end

def enter_to_continue
  STDIN.gets.chomp
end

Answer 1

您可以尝试 Rake::Task#enhance:

require 'rake'

ns = namespace :mytest do

  task :foo do |t|
    puts "You called task #{t}"
  end

  task :bar do |t|
    puts "You called task #{t}"
  end

  # ...
  # Let's say 10 more tasks ends with enter_to_continue comes after 
  # ...
end

#
#Add actions to each task (e.g. enter_to_continue)
#
ns.tasks.each{|tsk|
  tsk.enhance { puts "\treached method #{__method__}" }
}

#Test the result
task :default => "mytest:foo"
task :default => "mytest:bar"
if $0 == __FILE__
  Rake.application[:default].invoke
end

编辑：
您还可以在定义块内增强任务：

namespace :mytest do |ns|
  # 
  #...Task definitions...
  #
  ns.tasks.each{|tsk|
    tsk.enhance { puts "\treached method #{__method__}" }
  }
end