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I have a more or less large Perl script of ~ 1000 lines. The script accepts a few arguments and it runs straight forward. No modules, no functions. The script could be divided into three parts, initialization part, arguments parsing part and work part, but I don’t know how to do that. Everything must be kept in a single file. Please, can anyone give me instructions/advice how to structure my Perl script?
Thanks.
If you can see logical parts of your script, you should definitely abstract them into functions. Having a single script of over 1000 lines, and not breaking it up into whatever abstraction units your language provides (functions, classes, etc.) is a very bad idea. Maintaining your script, i. e. adding features and fixing bugs, will be a nightmare.
I strongly suggest you read the book Clean Code by Robert C. Martin. It uses Java for examples, but the ideas are applicable to any language. The one that is most relevant here is “Make your functions small. Then make them smaller.”