Leave something focused after destroying a task

[vopamoi] / vopamoi.ts

diff --git a/vopamoi.ts b/vopamoi.ts
index 8db28657eaddcdfb56a3ed15797bdacf5c65aba2..151c5e06103d8e8f68791350c0361c56fe5f9fdf 100644 (file)
--- a/vopamoi.ts
+++ b/vopamoi.ts
@@ -1,16 +1,111 @@
+// Typescript doesn't know about MAX_SAFE_INTEGER??  This was supposed to be
+// fixed in typescript 2.0.1 in 2016, but is not working for me in typescript
+// 4.2.4 in 2022.  :( https://github.com/microsoft/TypeScript/issues/9937
+//const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER;
+const MAX_SAFE_INTEGER = 9007199254740991;
+
+// A sane split that splits N *times*, leaving the last chunk unsplit.
+function splitN(str: string, delimiter: string, limit: number = MAX_SAFE_INTEGER): string[] {
+  if (limit < 1) {
+    return [str];
+  }
+  const at = str.indexOf(delimiter);
+  return at === -1 ? [str] : [str.substring(0, at)].concat(splitN(str.substring(at + delimiter.length), delimiter, limit - 1));
+}
+
 const Model = {
-  createTask: function (description: string) {
+  createTask: function (timestamp: string, description: string) {
     const task = document.createElement("div");
     task.appendChild(document.createTextNode(description));
+    task.setAttribute("class", "task");
     task.setAttribute("tabindex", "0");
+    task.setAttribute("data-created", timestamp);
     return task;
   },
 
+  addTask: function (timestamp: string, description: string) {
+    document.body.appendChild(this.createTask(timestamp, description)).focus();
+  },
+
+  getTask: function (createTimestamp: string) {
+    for (const task of document.getElementsByClassName("task")) {
+      if (task.getAttribute("data-created") === createTimestamp) {
+        return task;
+      }
+    }
+  },
+
+  destroyTask: function (createTimestamp: string) {
+    const task = this.getTask(createTimestamp);
+    task!.parentElement!.removeChild(task!);
+  },
+};
+
+const Log = (function () {
+  var next_log_index = 0;
+  return {
+    apply: function (entry: string) {
+      const [timestamp, command, data] = splitN(entry, " ", 2);
+      if (command == "Create") {
+        Model.addTask(timestamp, data);
+      }
+      if (command == "Destroy") {
+        Model.destroyTask(data.split(" ", 1)[0]);
+      }
+    },
+
+    record: function (entry: string) {
+      window.localStorage.setItem(`${next_log_index++}`, entry);
+    },
+
+    recordAndApply: function (entry: string) {
+      this.record(entry);
+      this.apply(entry);
+    },
+
+    replay: function () {
+      while (true) {
+        const entry = window.localStorage.getItem(`${next_log_index}`);
+        if (entry === null) {
+          break;
+        }
+        this.apply(entry);
+        next_log_index++;
+      }
+    },
+  };
+})();
+
+const UI = {
   addTask: function (description: string) {
-    document.body.appendChild(this.createTask(description)).focus();
+    Log.recordAndApply(`${Date.now()} Create ${description}`);
+  },
+  destroyTask: function (createTimestamp: string) {
+    Log.recordAndApply(`${Date.now()} Destroy ${createTimestamp} ${Model.getTask(createTimestamp)?.textContent}`);
+  },
+};
+
+const BrowserUI = {
+  addTask: function (form: any) {
+    if (form.taskName.value) {
+      UI.addTask(form.taskName.value);
+      form.taskName.value = "";
+    }
+    return false;
+  },
+
+  destroyTask: function () {
+    const createTimestamp = document.activeElement?.getAttribute("data-created");
+    this.moveCursor(1) || this.moveCursor(-1);
+    return UI.destroyTask(createTimestamp!);
+  },
+
+  focusTaskNameInput: function (event: any) {
+    document.getElementById("taskName")!.focus();
+    event.preventDefault();
   },
 
-  moveCursor: function (offset: number) {
+  moveCursor: function (offset: number): boolean {
     var active = document.activeElement;
     if (offset === 1 && active) {
       active = active.nextElementSibling;
@@ -18,27 +113,24 @@ const Model = {
     if (offset === -1 && active) {
       active = active.previousElementSibling;
     }
-    if (active && active instanceof HTMLElement) active.focus();
+    if (active && active instanceof HTMLElement) {
+      active.focus();
+      return true;
+    }
+    return false;
   },
 };
 
 function handleKey(event: any) {
   if (event.target.tagName !== "INPUT") {
-    if (event.key == "j") Model.moveCursor(1);
-    if (event.key == "k") Model.moveCursor(-1);
-    if (event.key == "c") {
-      document.getElementById("taskName")!.focus();
-      event.preventDefault();
-    }
+    if (event.key == "j") return BrowserUI.moveCursor(1);
+    if (event.key == "k") return BrowserUI.moveCursor(-1);
+    if (event.key == "c") return BrowserUI.focusTaskNameInput(event);
+    if (event.key == "X") return BrowserUI.destroyTask();
   }
 }
 
-function browserCreateTask(form: any) {
-  Model.addTask(form.taskName.value);
-  form.taskName.value = "";
-  return false;
-}
-
 function browserInit() {
   document.body.addEventListener("keydown", handleKey, { capture: false });
+  Log.replay();
 }