CODEWITHSUNDEEP
ruby
simplytrue
simplytrue

Reputation: 59

How do I get this if - else command, when using Dir.glob to let me know when the file does not exists

I have successfully build a file finder with Dir.glob but now am wanting to know if the file is not found as well - dealing with 1000's of files so I need to know if one is not found.

The code I have is this:

 # code above gets a file name from a list of in a file then I search the computer for the file:

 Dir.glob("#{folder}/**/#{search_file_name}")  do |f|  

 if File.exists?(f)
     puts "the file name #{f} is found"
     puts "now I am working on #{f}"  
 else
     puts "the file #{f} cannot be found"

     end

    #the rest of the code moves the file to a another directory if found.

This works well for files that exists. But if the file does not exists I do not get a message in the terminal to that effect. I am missing something obvious. Perhaps my Dir.glob only holds the files it finds so that |f| never passes a file to the if statement if it does not exists.

Upvotes: 1

Views: 231

Answers (1)

David Gross
David Gross

Reputation: 1873

You can't iterate through an empty Array. There is no need to set a conditional with File.exist?. Dir.glob will return [] if the file can not be found. 

def find_files(folder, search_file_name)
  file = Dir.glob("#{folder}/**/#{search_file_name}")
  puts "the file #{search_file_name} can't be found" if file.empty?
  file.each do |f|
    puts "the file name #{f} is found"
    puts "now I am working on #{f}" 
  end
end

Upvotes: 4

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