From: Paul Archer <paul@...>
Date: 2009-07-23T05:12:07+09:00
Subject: Re: safe move/copy with incrementing filenames?

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Here's what I came up with (incorporating your code, pharrington):

     def safe_move(source, dest, digits=2 )

         source.to_a.each do |src|

             if File.directory?(dest)
                 d = File.join(dest, File.basename(src) )
             else
                 d = dest
             end

             count = 0
             unique_name = d
             while File.exists?(unique_name)
                 count += 1
                 ext = File.extname(d)
                 unique_name = File.join(
                         File.dirname(d),
                         File.basename(d, ext) +
                         sprintf("_%0#{digits}d", count) +
                         ext )
             end
             d = unique_name

         return FileUtils.mv(src, d)
         end

     end


Paul



2:30am, pharrington wrote:

>> On Jul 20, 10:50�pm, Paul Archer <p...@paularcher.org> wrote:
>> So, I'm working on some DAM (digital asset management) scripts, and I want
>> to make sure that I don't overwrite any files when I move or copy them.
>> I was about to start working on a move method that would add a number to
>> the destination filename if the name already exists. (IE
>> mv('pma_20090720_1234.jpg', 'archive/2009/07') might create an
>> 'archive/2009/07/pma_20090720_1234-1.jpg if pma_20090720_1234.jpg exists.)
>>
>> Question: is there already a module that can do that?
>>
>> Paul
>
> I've just been doing this:
>
> def unique(filename)
>  count = 0
>  unique_name = filename
>  while File.exists?(unique_name)
>    count += 1
>    unique_name = "#{File.join(
>      File.dirname(filename),
>      File.basename(filename, ".*"))}_#{count}#{File.extname
> (filename)}"
>  end
>  unique_name
> end
>
> there's probably a better way though
>
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