From d0ede4169daec0f18d6ccbeeb8b4d6b18939014f Mon Sep 17 00:00:00 2001
From: Danila Danko <br4ch1st0chr0n3@gmail.com>
Date: Fri, 5 Jan 2024 15:40:42 +0300
Subject: [PATCH] fix: don't show single-element toc, handle clicks

---
 docs/theme/pagetoc.css |  4 ---
 docs/theme/pagetoc.js  | 80 +++++++++++++++++++++++++-----------------
 2 files changed, 48 insertions(+), 36 deletions(-)

diff --git a/docs/theme/pagetoc.css b/docs/theme/pagetoc.css
index 5d0c4ace..8ae85dee 100644
--- a/docs/theme/pagetoc.css
+++ b/docs/theme/pagetoc.css
@@ -5,10 +5,6 @@
     --toc-width: 310px;
 }
 
-a[class^="pagetoc-H"]:only-child {
-    display: none;
-}
-
 .nav-chapters {
     min-width: 50px;
 }
diff --git a/docs/theme/pagetoc.js b/docs/theme/pagetoc.js
index 2ff8dcc4..f44aa1a8 100644
--- a/docs/theme/pagetoc.js
+++ b/docs/theme/pagetoc.js
@@ -11,8 +11,6 @@ function forPagetocElem(fun) {
   forEach(getPagetocElems(), fun);
 }
 
-var activeHref = location.href;
-
 function getRect(element) {
   return element.getBoundingClientRect();
 }
@@ -25,32 +23,39 @@ function overflowBottom(container, element) {
   return getRect(container).bottom - getRect(element).bottom;
 }
 
-var updateFunction = function () {
-  var id = undefined;
+var activeHref = location.href;
+
+var updateFunction = function (elem = undefined) {
+  var id = elem;
 
-  if (location.href != activeHref) {
+  if (!elem && location.href != activeHref) {
     activeHref = location.href;
     forPagetocElem(function (el) {
-      if (el.href == activeHref) {
+      if (el.href === activeHref) {
         id = el;
       }
     });
   }
 
-  var elements = document.getElementsByClassName("header");
-  let menuBottom = getRect(document.getElementById("menu-bar")).bottom;
-  let contentCenter = window.innerHeight / 2;
-  let margin = contentCenter / 3;
+  console.log("id");
+  console.log(id);
 
-  forEach(elements, function (el, i, arr) {
-    if (id === undefined && getRect(el).bottom >= menuBottom) {
-      if (getRect(el).top >= contentCenter + margin) {
-        id = arr[Math.max(0, i - 1)];
-      } else {
-        id = el;
+  if (!id) {
+    var elements = document.getElementsByClassName("header");
+    let menuBottom = getRect(document.getElementById("menu-bar")).bottom;
+    let contentCenter = window.innerHeight / 2;
+    let margin = contentCenter / 3;
+
+    forEach(elements, function (el, i, arr) {
+      if (id === undefined && getRect(el).bottom >= menuBottom) {
+        if (getRect(el).top >= contentCenter + margin) {
+          id = arr[Math.max(0, i - 1)];
+        } else {
+          id = el;
+        }
       }
-    }
-  });
+    });
+  }
 
   forPagetocElem(function (el) {
     el.classList.remove("active");
@@ -72,19 +77,30 @@ var updateFunction = function () {
   });
 };
 
-// Populate sidebar on load
-window.addEventListener("load", function () {
-  var pagetoc = document.getElementsByClassName("pagetoc")[0];
-  var elements = document.getElementsByClassName("header");
-  forEach(elements, function (el) {
-    var link = document.createElement("a");
-    link.appendChild(document.createTextNode(el.text));
-    link.href = el.href;
-    link.classList.add("pagetoc-" + el.parentElement.tagName);
-    pagetoc.appendChild(link);
+var elements = document.getElementsByClassName("header");
+
+if (elements.length > 1) {
+  // Populate sidebar on load
+  window.addEventListener("load", function () {
+    var pagetoc = document.getElementsByClassName("pagetoc")[0];
+    var elements = document.getElementsByClassName("header");
+    forEach(elements, function (el) {
+      var link = document.createElement("a");
+      link.appendChild(document.createTextNode(el.text));
+      link.href = el.href;
+      link.classList.add("pagetoc-" + el.parentElement.tagName);
+      pagetoc.appendChild(link);
+      link.onclick = function () {
+        updateFunction(link);
+      };
+    });
+    updateFunction();
   });
-  updateFunction.call();
-});
 
-// Handle active elements on scroll
-window.addEventListener("scroll", updateFunction);
+  // Handle active elements on scroll
+  window.addEventListener("scroll", function () {
+    updateFunction();
+  });
+} else {
+  document.getElementsByClassName("sidetoc")[0].remove();
+}