From: Harry Ohlsen <harryo@...>
Date: 2004-03-24T12:53:23+09:00
Subject: Re: Ruby's module search path

Simon Strandgaard wrote:
> You may want to look at rextra.. I found this
> 
> 
> def required
>   result = []
>   $".each do |file|
>     $:.each do |path|
>       if File.exists?( path + '/' + file )
>         result << (path + '/' + file)
>         next
>       end
>     end
>   end
>   result
> end 

From the output, I'm guessing $" is the list of requires that have been executed so far?

I couldn't find that one in Ruby In A Nutshell ... that's not to say it isn't in there, of course.

I ended up with the following, which does a couple of other things.  If you give the script no arguments, it displays a list of all .rb files in the search path.  For any modules after a "-e" it invokes gvim (replace by your editor of choice).

That does everything I need for now.

Thanks to both you and Assaph for the help!

-------------------------

def which(libname)
  $:.each do |d|
    f = File.join(d, libname)
    f += ".rb"
    return f if File.exists? f
  end

  nil
end

def list_modules
  # Find all the .rb files

  modules = {}

  $:.each do |d|
    Dir[d + "/*.rb"].each do |path|
      base = path.sub(/.*\//, "").sub(/\.rb/, "")
      modules[base] = path
    end
  end

  # Display them, sorted by module name

  maxWidth = 0

  modules.keys.each do |mod|
    length = mod.length

    if length > maxWidth
      maxWidth = length
    end
  end

  modules.keys.sort.each do |mod|
    printf "%-*s %s\n", maxWidth, mod, modules[mod]
  end
end

if ARGV.length == 0
  list_modules
else
  edit = false

  ARGV.each do |mod|
    if mod == "-e"
      edit = true
    else
      if (path = which mod).nil?
        puts "Can't find module '#{mod}'"
      else
        if edit
          system "gvim #{path}"
        else
          puts path
        end
      end
    end
  end
end