[TxMt] Ruby require_cmd equivalent.

[Allan Odgaard]

On 31 Oct 2007, at 19:49, Simon Gregory wrote:

> [...] this isn't quite as elegant as the TM shell script require_cmd  
> (ruby prints the cmd not found error, and it takes a fraction longer  
> for ant to start up). Is there an equivalent I should be using with  
> ruby? If not is there a better way this could be achieved.

We don’t have a Ruby equivalent, but it would go something like this:

     exists = ENV['PATH'].split(':').any? { |dir| File.exists?  
File.join(dir, 'ant') }
     unless exists
       puts "Couldn’t find ‘ant’. Locations searches:"
       puts ENV['PATH'].gsub(/:/, "\n")
       abort
     end

Should probably be parameterized so we can later move it to a support  
library. Should maybe also check that the found file is executable.  
And would be nice if it also supported TM_ANT.

Speaking of the latter, it is not uncommon that users set e.g. TM_SVN  
to the *folder* containing svn, not the full path. Either we should  
allow that, or we should test against it (not directly related to the  
above, just thinking out loud).