1 files changed, 67 insertions, 0 deletions
diff --git a/haunt/static/js/section-folds.js b/haunt/static/js/section-folds.js
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+++ b/haunt/static/js/section-folds.js
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+/*
+ * section-folds.js -- Parse out sections to hide behind an "unfold" dialog
+ * Copyright © 2022 Jakob L. Kreuze <zerodaysfordays@sdf.org>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+function handleFolds() {
+    function displayFold(fold, foldText, frontMatterText) {
+        foldText.innerHTML = `⬇️ ${frontMatterText}`;
+        fold.classList.remove("fold-hidden");
+        
+    }
+
+    function hideFold(fold, foldText, frontMatterText) {
+        foldText.innerHTML = `➡️ Folded ${frontMatterText}`;
+        fold.classList.add("fold-hidden");
+    }
+
+    let folds = document.querySelectorAll(".section-fold");
+
+    for (let fold of folds) {
+        // The first thing we'll do is generate the "front matter" for the fold, so
+        // that the reader knows what lies beneath the fold.
+        let frontMatterText = `Section on "${fold.dataset.name}"`;
+        let foldFrontMatter = document.createElement("div");
+
+        // The text will be inside of an anchor, which we'll hook onto using an
+        // event listener.
+        let foldAnchor = document.createElement("a");
+        foldAnchor.href = "#";
+        let foldText = document.createElement("p");
+        foldAnchor.appendChild(foldText);
+        fold.parentNode.insertBefore(foldAnchor, fold);
+
+        // The fold will start off in the "hidden" state.
+        let toggle = false;
+        hideFold(fold, foldText, frontMatterText);
+
+        // But clicking on the "front matter" will cause the state of the fold
+        // to toggle, first to "visible", and then back to "hidden".
+        foldAnchor.addEventListener('click', () => {
+            toggle = !toggle;
+            if (toggle) {
+                displayFold(fold, foldText, frontMatterText);
+            } else {
+                hideFold(fold, foldText, frontMatterText);
+            }
+        });
+    }
+
+}
+
+// Defer parsing all of the "folds" until the document has completely loaded.
+document.addEventListener("DOMContentLoaded", handleFolds);