kick of downgrade setup

templates/downgrade/.github/workflows/downgraded_release.yaml

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+name: Downgraded Release
+
+on:
+    push:
+        tags:
+          # avoid infinite looping, skip tags that ends with ".72"
+          # see https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-including-and-excluding-branches
+          - '*'
+
+jobs:
+    downgrade_release:
+        runs-on: ubuntu-latest
+
+        steps:
+            -
+                uses: "actions/checkout@v3"
+                with:
+                    token: ${{ secrets.ACCESS_TOKEN }}
+
+            -
+                uses: "shivammathur/setup-php@v2"
+                with:
+                    php-version: 8.2
+                    coverage: none
+
+            # invoke patches
+            -   run: composer install --ansi
+
+            # but no dev packages
+            -   run: composer update --no-dev --ansi
+
+            # get rector to "rector-local" directory, to avoid downgrading itself in the /vendor
+            -   run: mkdir rector-local
+            -   run: composer require rector/rector --working-dir rector-local --ansi
+
+            # downgrade to PHP 7.2
+            -   run: rector-local/vendor/bin/rector process src bin vendor --config build/rector-downgrade-php-72.php --ansi
+
+            # clear the dev files
+            -   run: rm -rf tests ecs.php phpstan.neon phpunit.xml .gitignore .editorconfig
+
+            # prefix and scope
+            -   run: sh prefix-code.sh
+
+            # copy PHP 7.2 composer + workflows
+            -   run: cp -r build/target-repository/. .
+
+            # clear the dev files
+            -   run: rm -rf build prefix-code.sh full-tool-build.sh scoper.php rector.php rector-local php-scoper.phar
+
+            # setup git user
+            -
+              run: |
+                  git config user.email "[email protected]"
+                  git config user.name "GitHub Action"
+                  # publish to the same repository with a new tag
+                  # see https://tomasvotruba.com/blog/how-to-release-php-81-and-72-package-in-the-same-repository/
+            -
+                name: "Tag Downgraded Code"
+                run: |
+                    # separate a "git add" to add untracked (new) files too
+                    git add --all
+                    git commit -m "release PHP 7.2 downgraded"
+                    
+                    # force push tag, so there is only 1 version
+                    git tag "${GITHUB_REF#refs/tags/}" --force
+                    git push origin "${GITHUB_REF#refs/tags/}" --force

templates/downgrade/build/rector-downgrade-php-72.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return RectorConfig::configure()
+    ->withDowngradeSets(php72: true)
+    ->withSkip([
+        // typical tests locations
+        '*/Tests/*',
+        '*/tests/*',
+        __DIR__ . '/../../tests',
+    ]);

templates/downgrade/prefix-code.sh

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+#!/usr/bin/env bash
+
+# inspired from https://github.com/rectorphp/rector/blob/main/build/build-rector-scoped.sh
+
+# see https://stackoverflow.com/questions/66644233/how-to-propagate-colors-from-bash-script-to-github-action?noredirect=1#comment117811853_66644233
+export TERM=xterm-color
+
+# show errors
+set -e
+
+# script fails if trying to access to an undefined variable
+set -u
+
+
+# functions
+note()
+{
+    MESSAGE=$1;
+    printf "\n";
+    echo "\033[0;33m[NOTE] $MESSAGE\033[0m";
+}
+
+# ---------------------------
+
+# 2. scope it
+note "Downloading php-scoper 0.18.3"
+wget https://github.com/humbug/php-scoper/releases/download/0.18.3/php-scoper.phar -N --no-verbose
+
+
+note "Running php-scoper"
+
+# Work around possible PHP memory limits
+# @todo detect dirs, that exist
+php -d memory_limit=-1 php-scoper.phar add-prefix src bin vendor composer.json --config scoper.php --force --ansi --output-dir scoped-code
+
+# the output code is in "/scoped-code", lets move it up
+# the local directories have to be empty to move easily
+rm -r src bin vendor composer.json
+mv scoped-code/* .
+
+note "Dumping Composer Autoload"
+composer dump-autoload --ansi --classmap-authoritative --no-dev
+
+# make bin runnable without "php"
+# @todo detect bin files if any
+chmod 777 "bin/class-leak"
+chmod 777 "bin/class-leak.php"
+
+note "Finished"

templates/downgrade/scoper.php

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+<?php
+
+declare(strict_types=1);
+
+require __DIR__ . '/vendor/autoload.php';
+
+$nowDateTime = new DateTime('now');
+$timestamp = $nowDateTime->format('Ym');
+
+// see https://github.com/humbug/php-scoper
+return [
+    // @todo detect :)
+    'prefix' => 'ClassLeak' . $timestamp,
+    'expose-constants' => ['#^SYMFONY\_[\p{L}_]+$#'],
+    // @todo detect
+    'exclude-namespaces' => ['#^TomasVotruba\\\\ClassLeak#', '#^Symfony\\\\Polyfill#'],
+    'exclude-files' => [
+        // do not prefix "trigger_deprecation" from symfony - https://github.com/symfony/symfony/commit/0032b2a2893d3be592d4312b7b098fb9d71aca03
+        // these paths are relative to this file location, so it should be in the root directory
+        'vendor/symfony/deprecation-contracts/function.php',
+    ],
+    'patchers' => [],
+];