initial commit

.gitignore

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+*~
+.*.sw[a-p]

README.md

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+The points system in [Question2Answer][1] allows for awarding points for
+accepting an answer to the user accepting the answer, which serves as an
+incentive to actually mark an answer as "best answer." However, the software
+awards the points regardless of whether the answer is from the person asking the
+question or someone else, and doesn't provide an option to change that behavior.
+This might tempt some people to increase their points by posting a lot of
+(trivial) questions and accepting their own (trivial) answer.
+
+This plugin changes the default behavior so that points are only awarded to the
+user accepting an answer if that answer wasn't posted by themselves.
+
+To activate it, copy the plugin directory to the plugins directory of your
+Question2Answer site (or clone this repository there), then log in as the site
+admin and enable the plugin under *Admin → Plugins*.

metadata.json

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+{
+	"name": "No Self-Accept Points",
+	"description": "Don't award points for accepted self-answers.",
+	"version": "1.0.0",
+	"date": "2020-08-09",
+	"author": "Ansgar Wiechers",
+	"author_uri": "https://ask.planetcobalt.net/",
+	"license": "GPLv3",
+	"min_q2a": "1.5",
+	"load_order": "after_db_init"
+}

points.php

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+<?php
+
+// don't allow this page to be requested directly from browser
+if (!defined('QA_VERSION')) {
+	header('Location: ../../');
+	exit;
+}
+
+/**
+ * Override the formula for calculating points for accepting answers to remove
+ * accepted self-answers.
+ */
+function qa_db_points_calculations() {
+	$points_calculations = qa_db_points_calculations_base();
+
+	if (array_key_exists('aselects', $points_calculations)) {
+		$points_calculations['aselects']['formula'] = "COUNT(*) AS aselects FROM ^posts AS userid_src JOIN ^posts AS answers ON userid_src.selchildid=answers.postid WHERE userid_src.userid~ AND userid_src.type='Q' AND (answers.userid <> userid_src.userid)";
+	} else {
+		// if key 'aselects' is missing: throw a warning, but continue regardless
+		trigger_error("Missing key 'aselects' in points calculations array", E_USER_WARNING);
+	}
+
+	return $points_calculations;
+}

qa-plugin.php

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+<?php
+/*
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  More about this license: https://www.gnu.org/licenses/gpl-3.0.html
+*/
+
+// don't allow this page to be requested directly from browser
+if (!defined('QA_VERSION')) {
+	header('Location: ../../');
+	exit;
+}
+
+qa_register_plugin_overrides('points.php');