From 00bf20ed68fb8b833967c207bb3689dc96098073 Mon Sep 17 00:00:00 2001
From: Thomas Lange <code@nerdmind.de>
Date: Mon, 5 Feb 2024 20:08:08 +0100
Subject: Add content tag converter script

This script is used to convert the old *content tag* syntax to the newer
*content functions* syntax which has been introduced in July 2021.

See the wiki page for *content tags* for more details.
---
 core/script/convert_content_tags.php | 142 +++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 core/script/convert_content_tags.php

diff --git a/core/script/convert_content_tags.php b/core/script/convert_content_tags.php
new file mode 100644
index 0000000..7b879a3
--- /dev/null
+++ b/core/script/convert_content_tags.php
@@ -0,0 +1,142 @@
+<?php
+use ORM\EntityInterface;
+require '../application.php';
+
+#===========================================================================
+# Convert old *content tags* to new *content functions* syntax
+#===========================================================================
+function convertContentTags(string $text, &$globalMatches): string {
+	$url_tags_pattern = '/\{(?<tag>BASE|FILE)\[\"(?<arg>[^"]+)\"\]\}/';
+	$entity_tags_pattern_partial = '\{(?<tag>POST|PAGE|USER)\[(?<arg>[0-9]+)\]\}';
+	$entity_tags_mdlinks_pattern = '/
+		\[(?<text>[^\]]+)\]
+		\(
+			\s*'.$entity_tags_pattern_partial.'\s*
+			(?:\s
+				(?<qmark>["\'])
+					(?<title>(?:(?:(?!\k<qmark>)).)*)
+				\k<qmark>\s*
+			)?
+		\)
+	/x';
+
+	// Convert (BASE|FILE) tags
+	$text = preg_replace_callback($url_tags_pattern,
+		function($matches) use(&$globalMatches) {
+			$formatted = sprintf('{%s_URL: "%s"}',
+				$matches['tag'], $matches['arg']);
+
+			$globalMatches[] = [
+				$matches[0], $formatted];
+
+			return $formatted;
+		}, $text);
+
+	// Convert (POST|PAGE|USER) tags found inside Markdown syntax
+	$text = preg_replace_callback($entity_tags_mdlinks_pattern,
+		function($matches) use(&$globalMatches) {
+			$format = '{%s: %d, "%s"}';
+			$params = [
+				$matches['tag'],
+				$matches['arg'],
+				str_replace('"', '\\"', $matches['text'])
+			];
+
+			if($linkTitle = $matches['title'] ?? FALSE) {
+				$q = $matches['qmark'];
+				$format = '{%s: %d, "%s", '.$q.'%s'.$q.'}';
+				$params[] = $linkTitle;
+			}
+
+			$formatted = sprintf($format, ...$params);
+
+			$globalMatches[] = [
+				$matches[0], $formatted];
+
+			return $formatted;
+		}, $text);
+
+	// Convert (POST|PAGE|USER) tags found anywhere else
+	$text = preg_replace_callback(sprintf('/%s/x', $entity_tags_pattern_partial),
+		function($matches) use(&$globalMatches) {
+			$formatted = sprintf('{%s_URL: %s}',
+				$matches['tag'], $matches['arg']);
+
+			$globalMatches[] = [
+				$matches[0], $formatted];
+
+			return $formatted;
+		}, $text);
+
+	return $text;
+}
+
+#===========================================================================
+# Print matches for a specific entity
+#===========================================================================
+function printMatches(EntityInterface $Entity, array &$matches): void {
+	printf("%s\n", str_repeat('-', 100));
+	printf("%s (#%d):\n", get_class($Entity), $Entity->getID());
+	printf("»%s«\n", $Entity->get('name') ?? $Entity->get('fullname'));
+	printf("%s\n", str_repeat('-', 100));
+
+	foreach($matches as $match) {
+		printf("<-- %s\n", $match[0]);
+		printf("--> %s\n\n", $match[1]);
+	}
+}
+
+#===========================================================================
+# Send Cache-Control header and change Content-Type to plain text
+#===========================================================================
+HTTP::responseHeader('Cache-Control', 'no-cache');
+HTTP::responseHeader(HTTP::HEADER_CONTENT_TYPE, HTTP::CONTENT_TYPE_TEXT);
+
+#===========================================================================
+# Set "commit" variable based on GET parameter or CLI argument
+#===========================================================================
+$commit = FALSE;
+if(isset($_GET['commit']) OR
+	(isset($argv[1]) AND $argv[1] === 'commit')) {
+	$commit = TRUE;
+}
+
+#===========================================================================
+# Print header information
+#===========================================================================
+if(!$commit) {
+	printf("%s\n", str_repeat('%', 100));
+	print("!!! DRY-RUN !!!\n");
+	print("To commit the changes, pass the CLI argument 'commit'!\n");
+	printf("%s\n\n", str_repeat('%', 100));
+}
+
+foreach(['Category', 'Page', 'Post', 'User'] as $entityName) {
+	$Repository = Application::getRepository($entityName);
+
+	foreach($Repository->getAll() as $Entity) {
+		unset($matches);
+
+		$content = $Entity->get('body');
+		$content = convertContentTags($content, $matches);
+
+		if($matches) {
+			$foundMatches = TRUE;
+
+			if($commit) {
+				$Entity->set('body', $content);
+				$Repository->update($Entity);
+			} else {
+				printMatches($Entity, $matches);
+			}
+		}
+	}
+}
+
+if(!isset($foundMatches)) {
+	print("Found no matches for old content tags in your entities' content. Nothing to do!");
+} else {
+	$commit && print("Replace operation complete!");
+}
+
+print("\n");
-- 
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