From 8ca99e7e8288bcfa2580445c22469c7a8dd3239b Mon Sep 17 00:00:00 2001
From: sbosse <sbosse@uni-bremen.de>
Date: Mon, 21 Jul 2025 23:13:12 +0200
Subject: [PATCH] Mon 21 Jul 22:43:21 CEST 2025

---
 js/web/killring.js | 104 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 js/web/killring.js

diff --git a/js/web/killring.js b/js/web/killring.js
new file mode 100644
index 0000000..822af2b
--- /dev/null
+++ b/js/web/killring.js
@@ -0,0 +1,104 @@
+/* ------------------------------------------------------------------------*
+ * Copyright 2013-2014 Arne F. Claassen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------*/
+
+var Josh = Josh || {};
+(function(root) {
+  Josh.KillRing = function(config) {
+    config = config || {};
+
+    var _console = Josh.Debug && root.console ? root.console : {log: function() {
+    }};
+    var _ring = config.ring || [];
+    var _cursor = config.cursor || 0;
+    var _uncommitted = false;
+    var _yanking = false;
+    if(_ring.length == 0) {
+      _cursor = -1;
+    } else if(_cursor >= _ring.length) {
+      _cursor = _ring.length - 1;
+    }
+    var self = {
+      isinkill: function() {
+        return _uncommitted;
+      },
+      lastyanklength: function() {
+        if(!_yanking) {
+          return 0;
+        }
+        return _ring[_cursor].length;
+      },
+      append: function(value) {
+        _yanking = false;
+        if(!value) {
+          return;
+        }
+        if(_ring.length == 0 || !_uncommitted) {
+          _ring.push('');
+        }
+        _cursor = _ring.length - 1;
+        _console.log("appending: " + value);
+        _uncommitted = true;
+        _ring[_cursor] += value;
+      },
+      prepend: function(value) {
+        _yanking = false;
+        if(!value) {
+          return;
+        }
+        if(_ring.length == 0 || !_uncommitted) {
+          _ring.push('');
+        }
+        _cursor = _ring.length - 1;
+        _console.log("prepending: " + value);
+        _uncommitted = true;
+        _ring[_cursor] = value + _ring[_cursor];
+      },
+      commit: function() {
+        _console.log("committing");
+        _yanking = false;
+        _uncommitted = false;
+      },
+      yank: function() {
+        self.commit();
+        if(_ring.length == 0) {
+          return null;
+        }
+        _yanking = true;
+        return _ring[_cursor];
+      },
+      rotate: function() {
+        if(!_yanking || _ring.length == 0) {
+          return null;
+        }
+        --_cursor;
+        if(_cursor < 0) {
+          _cursor = _ring.length - 1;
+        }
+        return self.yank();
+      },
+      items: function() {
+        return _ring.slice(0);
+      },
+      clear: function() {
+        _ring = [];
+        _cursor = -1;
+        _yanking = false;
+        _uncommited = false;
+      }
+    };
+    return self;
+  }
+})(this);
\ No newline at end of file