Proposal for format_text() check in Moodle

gistfile1.diff

diff --git a/lib/weblib.php b/lib/weblib.php
index 647504a..28aef68 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -1174,6 +1174,14 @@ function format_text($text, $format = FORMAT_MOODLE, $options = NULL, $courseid_
         // The only potential problem is that somebody might try to format
         // the text before storing into database which would be itself big bug.
         $text = str_replace("\"$CFG->httpswwwroot/draftfile.php", "\"$CFG->httpswwwroot/brokenfile.php#", $text);
+
+        // Before calling format_text(), the text must be processed with {@link file_rewrite_pluginfile_urls()}
+        // or its equivalent. Inform the developer.
+        if (debugging('', DEBUG_DEVELOPER)) {
+            if (strpos($text, '@@PLUGINFILE@@')) {
+                debugging('Attempting to format a text with non-rewritten pluginfile URL', DEBUG_DEVELOPER);
+            }
+        }
     }

     // Warn people that we have removed this old mechanism, just in case they

if (strpos($text, '@@PluginFile@@') !== false) {