Rake中任务名称的别名

Question

当我需要别名某个任务的名字时,我该怎么做？

例如,如何更改任务名称:

rake db:table
rake db:create
rake db:schema
rake db:migration

至:

rake db:t
rake db:c
rake db:s
rake db:m

---

得到答案后编辑:

def alias_task(tasks)
    tasks.each do |new_name, old_name|
        task new_name, [*Rake.application[old_name].arg_names] => [old_name]
    end
end

alias_task [
    [:ds, :db_schema],
    [:dc, :db_create],
    [:dr, :db_remove]
]

Answer 1

为什么需要别名？您可以在没有任何代码的情况下引入新任务,但具有原始任务的先决条件.

namespace :db do
  task :table do
    puts "table"
  end
  #kind of alias
  task :t => :table
end

这可以与参数结合:

require 'rake'
desc 'My original task'
task :original_task, [:par1, :par2] do |t, args|
  puts "#{t}: #{args.inspect}"
end

#Alias task.
#Parameters are send to prerequisites, if the keys are identic.
task :alias_task, [:par1, :par2] => :original_task

要避免搜索参数名称,您可以使用以下方法读取参数arg_names:

#You can get the parameters of the original 
task :alias_task2, *Rake.application[:original_task].arg_names, :needs => :original_task

将它与一个define_alias_task方法结合起来:

def define_alias_task(alias_task, original)
  desc "Alias #{original}"
  task alias_task, *Rake.application[original].arg_names, :needs => original
end
define_alias_task(:alias_task3, :original_task)

用ruby 1.9.1和rake-0.8.7测试.

嗯,好吧,我看到RyanTM在几个小时前已经发布了或多或少完全相同的解决方案.

Answer 2

以下是有人编写的代码:https://gist.github.com/232966

def alias_task(name, old_name)
  t = Rake::Task[old_name]
  desc t.full_comment if t.full_comment
  task name, *t.arg_names do |_, args|
    # values_at is broken on Rake::TaskArguments
    args = t.arg_names.map { |a| args[a] }
    t.invoke(args)
  end
end