From: "Jesse B." <jessebos@...>
Date: 2010-04-05T06:37:44+09:00
Subject: Re: change in number of leading spaces

Robert, Thank you for taking the time to write back.
I got the initial file operations you gave me working like so:

File.open("output.txt", "w") do |outfile|
File.foreach "input.txt" do |line|
puts line
outfile.write line
end
end

which both displays the results on the command line and in the 
output.txt file

then I tried to add in the rest like so

File.open("output.txt", "w") do |outfile|
File.foreach "input.txt" do |line|

def count_leading_spaces(s)
  s[/\A */].length # or any other method that works
end

sp = 0

ARGF.each_line do |line|
  i = count_leading_spaces line

  if i != sp
    line.chomp! # avoid duplicate \n
     printf "Change from %2d to %2d spaces in this line %4d: %s\n",
      sp, i, ARGF.lineno, line
    sp = i
  end
end


#puts line
#outfile.write line
end
end

and when I save as a ruby file and run from the command line nothing 
happens, until i hit control-c and get a list of errors.

I think the problem is that I am incorrectly assembling your snippets.

Would it be possible to redo this as a complete example that works as a 
ruby file run from the command line?

thank you in advance

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