1 files changed, 132 insertions, 0 deletions
diff --git a/assets/javascript/finder.js b/assets/javascript/finder.js
new file mode 100644
index 0000000..925a135
--- /dev/null
+++ b/assets/javascript/finder.js
@@ -0,0 +1,132 @@
+(() => {
+  /** @typedef {{ key: string; elem: HTMLElement; labelElem: HTMLElement | null }} Match */
+
+  const addRoot = () => {
+    const root = document.createElement('div');
+    document.body.appendChild(root);
+    return root;
+  }
+
+  /**
+   * @param match {Match}
+   * @return {Promise<HTMLElement | null>}
+   */
+  const createLabelElem = (match) => new Promise((resolve, reject) => {
+    const label = Object.assign(document.createElement('div'), {
+      className: '__nullbrowser_findlabel',
+      textContent: match.key,
+    });
+    requestAnimationFrame(() => {
+      const rect = match.elem.getBoundingClientRect();
+      if (rect.top < 0 | rect.top > window.innerHeight) return reject(null);
+      if (rect.left < 0 | rect.left > window.innerWidth) return reject(null);
+
+      resolve(label);
+      requestAnimationFrame(() => {
+        Object.assign(label.style, {
+          position: 'fixed',
+          zIndex: 999999999, // maybe a few more 9s will do
+          top: `${rect.top}px`,
+          left: `${rect.left}px`,
+          backgroundColor: 'yellow',
+          border: '1px solid #000',
+          boxShadow: '0 0 3px #555',
+          color: '#222',
+          padding: '1px 2px',
+          fontSize: '10px',
+          fontWeight: 'bold',
+          fontFamily: 'monospace',
+        });
+      });
+    });
+  });
+
+  const finder = {
+    /** @type {string} */
+    keys: '',
+    /** @type {Array<Match>} */
+    matches: [],
+    /** @type {HTMLElement | null} */
+    labelsRoot: null,
+    /** @type {boolean} */
+    openInNewView: false,
+
+    stop() {
+      finder.matches = [];
+      finder.keys = '';
+      [...(finder.labelsRoot?.children ?? [])].forEach(child => {
+        child.remove();
+      });
+    },
+
+    /**
+     * @param selector {string}
+     * @param new_view {boolean}
+     */
+    start(selector, new_view) {
+      finder.stop()
+      finder.labelsRoot ??= addRoot();
+      finder.createMatches(selector);
+      finder.openInNewView = new_view;
+    },
+
+    /** @param char {string} */
+    filterOutByKey(char) {
+      if (!/[0-9]+/.test(char)) return; // NOTE: temporary
+
+      finder.keys = finder.keys + char;
+      finder.matches = finder.matches.filter(m => {
+        const isMatch = m.key.startsWith(finder.keys);
+        if (!isMatch) {
+          m.labelElem?.remove();
+          return false;
+        }
+        return true;
+      });
+      if (finder.matches.length <= 1) {
+        const match = finder.matches[0]
+        finder.stop();
+        if (match) {
+          if (match.elem?.href) {
+            if (finder.openInNewView) {
+              window.open(match.elem?.href)
+            } else {
+              location.href = match.elem?.href
+            }
+          } else {
+            match.elem?.click()
+          }
+        }
+      }
+    },
+
+    /** @param selector {string} */
+    createMatches(selector) {
+      finder.matches = [];
+      const elements = document.querySelectorAll(selector);
+
+      const matches = [...elements].map(async (elem, index) => {
+        /** @type {Match} */
+        const match = {
+          elem,
+          key: `${index}`.padStart(`${elements.length}`.length, '0'),
+          labelElem: null,
+        }
+        match.labelElem = await createLabelElem(match);
+        return match
+      });
+
+      Promise.allSettled(matches).then(matches => {
+        matches.forEach(result => {
+          if (result.status !== 'fulfilled') return;
+          if (result.value.labelElem)
+            finder.labelsRoot.appendChild(result.value.labelElem)
+          finder.matches.push(result.value)
+        });
+      });
+    },
+  };
+
+  window._nullbrowser ||= {};
+  window._nullbrowser.finder ||= finder;
+})();