Generate files for multiple versions

[shish]

tl;dr:

replace

$function_list = read_docs();
generate_files($function_list, "../generated/");

with

foreach(["8.1", "8.2", "8.3", "8.4"] as $version) {
    exec("cd docs && git checkout $version");
    $function_list = read_docs();
    generate_files($function_list, "../generated/$version/");
}

generate a bunch of stubs like generated/misc.php:

<?php
if(PHP_VERSION == "8.1") require_once __DIR__ . "/8.1/misc.php";
if(PHP_VERSION == "8.2") require_once __DIR__ . "/8.2/misc.php";
if(PHP_VERSION == "8.3") require_once __DIR__ . "/8.3/misc.php";
if(PHP_VERSION == "8.4") require_once __DIR__ . "/8.4/misc.php";

This also automates generation of "deprecated" safe functions (ie, instead of hard-coding deprecated/apache.php, any functions which needed safe wrappers in 8.1 but no longer need safe wrappers in 8.2 will have no-op stubs generated instead)

Currently the Exceptions are shared between all versions, which I think is a good idea? (Thoughts, anybody?)

This isn't even remotely tested, just a proof of concept to show what this kind of approach might look like

[jhdxr]

The CI looks unhappy because of redeclaration, probaly caused by files pending for clean up?

I think we may split this huge PR into several small PR (one for generating scripts, and one for each PHP version), which makes the PR easy to read & review.

[shish]

I am unsure why the generator script is giving different outputs on my laptop and in CI testing D:

[shish]

Looks like CI was only checking out the most recent revision, and the git checkout command failed silently - both should be fixed now...

[shish]

• It passes automated tests 🥳
• Automated tests cover very little 😢
• I have done zero actual real testing 👀 (That is the next thing I'm going to do after writing this comment)
• I don't even know how to test the Rector stuff, I've never used Rector before 😕 If you know rector please help
• Yes, the commit is huge, but you can treat the stuff in generated/ as a black box (or just glance over one or two files to get a sense for how it works), the main changes are in generator/
• No, I don't see any way of meaningfully splitting it into smaller commits without breaking it (eg sure I could have one commit which changes the generator files and one which changes generated files, but then that first commit will fail tests because it's out of sync)

If you want to test this, you can add a dependency on "thecodingmachine/safe": "dev-pr503" in your composer.json (like this - https://github.com/shish/shimmie2/pull/1379/files) - if people could try that and let me know if it works for your projects, that'd be great <3