Fix index histogram minlen parameter for metadata keys

This includes a test for the minlen parameter for metadata keys

_test/tests/inc/indexer_histogram.test.php

+<?php
+/**
+ * Tests the histogram function of the indexer.
+ *
+ * @author Michael Hamann <michael@content-space.de>
+ */
+class indexer_histogram_test extends DokuWikiTest {
+    function test_minlength() {
+        $indexer = idx_get_indexer();
+        $indexer->addMetaKeys('histo1', 'testkey', array('foo', 'bar', 'foobar'));
+        $indexer->addMetaKeys('histo2', 'testkey', array('bar', 'testing'));
+        $indexer->addMetaKeys('histo3', 'testkey', array('foo', 'foobar'));
+        $histogram4 = $indexer->histogram(1, 0, 4, 'testkey');
+        $this->assertEquals(array('foobar' => 2, 'testing' => 1), $histogram4);
+        $histogram2 = $indexer->histogram(1, 0, 2, 'testkey');
+        $this->assertEquals(array('foobar' => 2, 'testing' => 1, 'foo' => 2, 'bar' => 2), $histogram2);
+    }
+
+}

inc/indexer.php

@@ -755,13 +755,15 @@ class Doku_Indexer {
             $val_idx = array();
             foreach ($index as $wid => $line) {
                 $freq = $this->countTuples($line);
-                if ($freq >= $min && (!$max || $freq <= $max) && strlen($val) >= $minlen)
+                if ($freq >= $min && (!$max || $freq <= $max))
                     $val_idx[$wid] = $freq;
             }
             if (!empty($val_idx)) {
                 $words = $this->getIndex($metaname.'_w', '');
-                foreach ($val_idx as $wid => $freq)
-                    $result[$words[$wid]] = $freq;
+                foreach ($val_idx as $wid => $freq) {
+                    if (strlen($words[$wid]) >= $minlen)
+                        $result[$words[$wid]] = $freq;
+                }
             }
         }
         else {