From: Ryan Davis <ryand-ruby@...>
Date: 2011-12-06T04:59:34+09:00
Subject: Re: rake --dry-run: how to see what sh commands will be run?


On Dec 2, 2011, at 09:14 , La Wi wrote:

> I am trying to set up some rules to build files with locally installed
> tools. I have no trouble getting my rules to work, and to invoke shell
> commands with sh().
> 
> However, what I can't figure out is how to get a display of shell
> commands without actually excecutiing them. I thought I could run 'rake
> --dry-run' but that seems to display only the filenames that would be
> updated.
> 
> I've found that setting 'verbose true' in my Rakefile causes the shell
> commands to be displayed as they are executed. And I've found that
> setting 'nowrite true' does EXACTLY what I want, but I can't figure out
> how to turn it on via a rake command flag.
> 
> I looked in the rake.rb source (rake-0.8.3), and it LOOKS like --dry-run
> should set both 'verbose' and 'nowrite' for me. But I can't seem to get
> actual verbose or dryrun behaviors unless I set them in my Rakefile.

I'm pulling this completely out of my butt... but you might want to try something along the lines of:

if Rake.application.trace then
  alias old_sh sh

  def sh(*a)
    old_sh "echo", *a
  end
end

P.S. I would LOVE to see a ruby port of Jam if you were so inclined. For C projects it is a vastly superior tool. :)