From: Robert Klemme <shortcutter@...>
Date: 2010-10-16T19:00:10+09:00
Subject: Re: Most elegant way: array of files from array of directories

On 16.10.2010 06:50, Terry Michaels wrote:
> I have a array of directories passed into my program. I want a new array
> which is a list of all files in said directories (only one level deep is
> necessary). N.B.:
>
> 1. Each elements of the new array must be an absolute (full) path, or at
> least relative to the cwd. (Assume all directories provided are also
> absolute or relative to cwd)
> 2. OS and preference agnostic: Especially, I do not know what directory
> separator will be used (say, backward- or forward-slash) or whether
> there will be a trailing directory separator in the directory path (say,
> a trailing forward-slash).

You can always use a forward slash in Ruby.  Duplicate slashes are not 
an issue either IIRC.

> Dir.foreach almost does what I want, but gives relative output instead
> of absolute.
>
> array_of_file_paths = Array.new
>
> array_of_directory_paths.each do |directory_path|
>    # ???
> end

How about

array_of_file_paths = array_of_directory_paths.map do |dir|
   Dir["#{dir}/*", "#{dir}/.*"]
end.delete_if {|f| test ?d, f}

?  Of course, if you do not need hidden files you can omit the second 
arg to Dir[].

Kind regards

	robert

-- 
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