From 4f49b16079b27d7ce633619e4cddfdf2bffbc952 Mon Sep 17 00:00:00 2001
From: cashmere <cashmere@autistici.org>
Date: Fri, 4 Sep 2026 09:05:24 +0200
Subject: initial commit

---
 src/tree.js | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/tree.js

(limited to 'src/tree.js')

diff --git a/src/tree.js b/src/tree.js
new file mode 100644
index 0000000..db4aa24
--- /dev/null
+++ b/src/tree.js
@@ -0,0 +1,72 @@
+/* Javascript to implement the file hierarchy tree.
+*/
+(function(){
+function isExpanded(ul){
+  return ul.className=='';
+}
+
+function toggleDir(ul, useInitValue){
+  if( !useInitValue ){
+    expandMap[ul.id] = !isExpanded(ul);
+    history.replaceState(expandMap, '');
+  }
+  ul.className = expandMap[ul.id] ? '' : 'collapsed';
+}
+
+function toggleAll(tree, useInitValue){
+  var lists = tree.querySelectorAll('.subdir > ul > li ul');
+  if( !useInitValue ){
+    var expand = true;  /* Default action: make all sublists visible */
+    for( var i=0; lists[i]; i++ ){
+      if( isExpanded(lists[i]) ){
+        expand = false; /* Any already visible - make them all hidden */
+        break;
+      }
+    }
+    expandMap = {'*': expand};
+    history.replaceState(expandMap, '');
+  }
+  var className = expandMap['*'] ? '' : 'collapsed';
+  for( var i=0; lists[i]; i++ ){
+    lists[i].className = className;
+  }
+}
+
+function checkState(){
+  expandMap = history.state || {};
+  if( '*' in expandMap ) toggleAll(outer_ul, true);
+  for( var id in expandMap ){
+    if( id!=='*' ) toggleDir(document.getElementById(id), true);
+  }
+}
+
+function belowSubdir(node){
+  do{
+    node = node.parentNode;
+    if( node==subdir ) return true;
+  } while( node && node!=outer_ul );
+  return false;
+}
+
+var history = window.history || {};
+if( !history.replaceState ) history.replaceState = function(){};
+var outer_ul = document.querySelector('.filetree > ul');
+var subdir = outer_ul.querySelector('.subdir');
+var expandMap = {};
+checkState();
+outer_ul.onclick = function(e){
+  e = e || window.event;
+  var a = e.target || e.srcElement;
+  if( a.nodeName!='A' ) return true;
+  if( a.parentNode.parentNode==subdir ){
+    toggleAll(outer_ul);
+    return false;
+  }
+  if( !belowSubdir(a) ) return true;
+  var ul = a.parentNode.nextSibling;
+  while( ul && ul.nodeName!='UL' ) ul = ul.nextSibling;
+  if( !ul ) return true; /* This is a file link, not a directory */
+  toggleDir(ul);
+  return false;
+}
+}())
-- 
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