From: Jan Svitok <jan.svitok@...>
Date: 2007-01-15T07:54:04+09:00
Subject: Re: File.rename says file name is to long

On 1/14/07, Lovell <lovell.mcilwain@gmail.com> wrote:

Few more notes:

1. you get an array from Dir.entries, so instead of:

> test = []
> Dir.chdir("/Users/lem/pictures/")
> test[test.length] = Dir.entries("Amber Copy")

you can write just (unless you want to append the data, in which case
keep the first line, and use test += Dir.entries...):

Dir.chdir("/Users/lem/pictures/")
test = Dir.entries("Amber Copy")

2. You can rid of the counter using each_with_index:

> test.to_s.each do |pics|
>  counter = 0
>  File.rename(pics , "Amber " + counter.to_s + ".jpg")
>   counter = counter + 1
> end

test.each_with_index do |pics, counter|
  File.rename(pics , "Amber " + counter.to_s + ".jpg")
end

(NB: counter = counter +1 can be written as counter +=1)

3. if you use #{} in the string, you can get rid of to_s (plus it will
be a bit faster):

>  File.rename(pics , "Amber " + counter.to_s + ".jpg")
  File.rename(pics , "Amber#{counter}.jpg")

4. IMPORTANT: you most probably want to rename .jpg files only, so either add

if pics =~ /\.jpg$/
  File.rename(pics , "Amber#{counter}.jpg")
end

or  (the same):
  File.rename(pics , "Amber#{counter}.jpg") if pics =~ /\.jpg$/

With this approach the skipped files will update the counter, so some
numbers will be missing. Therefore it's better to remove the files
from test array first, before renaming:

test = Dir.entries("Amber Copy").select {|f| f =~ /\.jpg$/}