This is a script called m5.awk that I randomly found after reading a paper about it on the ACM website. The paper’s worth reading too but the script is just a piece of work. Commented to the brim, clean, and most importantly, useful as hell. it could be a replacement for m4. It allows you to embed AWK in text files, and besides that, it allows you to use several preprocessng features that it offers via macros. Give it a try.
It does not really need to explain what it ‘is’ because
1- a paper has been released on ACM explaining it, you can download it for free from here: https://dl.acm.org/doi/pdf/10.1145/353474.353484
2- It’s name is m5, most people in the UNIX world know what m4 is. If you have Linux, bring up
info m4.Imagine this, when you use C, there is a preprocessor that does all the
#includeand#defines, m4 is like that and m5 is like that too. Preprocessing used to be big, but now it’s not. If you wanna see an example of preprocessing, look at this preprocessor I made for C: https://gist.github.com/Chubek/b2846855e5bb71a67c7e3effc6beefd6