Persistence

[vopamoi] / vopamoi.ts

diff --git a/vopamoi.ts b/vopamoi.ts
index cb2d50e5555676e16f95ec2d8b94db52bcb9a425..4d6cd86bfe25289cca1a52969530f6e17851dfe2 100644 (file)
--- a/vopamoi.ts
+++ b/vopamoi.ts
@@ -1,11 +1,98 @@
-var tasks = [];
+// 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;
 
-function addTask(task: string) {
-  tasks.push(task);
+// 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) {
+    const task = document.createElement("div");
+    task.appendChild(document.createTextNode(description));
+    task.setAttribute("tabindex", "0");
+    return task;
+  },
+
+  addTask: function (description: string) {
+    document.body.appendChild(this.createTask(description)).focus();
+  },
+
+  moveCursor: function (offset: number) {
+    var active = document.activeElement;
+    if (offset === 1 && active) {
+      active = active.nextElementSibling;
+    }
+    if (offset === -1 && active) {
+      active = active.previousElementSibling;
+    }
+    if (active && active instanceof HTMLElement) active.focus();
+  },
+};
+
+const Log = (function () {
+  var next_log_index = 0;
+  return {
+    addTask: function (description: string) {
+      this.recordAndApplyLogEntry(`${Date.now()} Create ${description}`);
+    },
+
+    applyLogEntry: function (entry: string) {
+      const [timestamp, command, data] = splitN(entry, " ", 2);
+      if (command == "Create") {
+        Model.addTask(data);
+      }
+    },
+
+    recordLogEntry: function (entry: string) {
+      window.localStorage.setItem(`${next_log_index++}`, entry);
+    },
+
+    recordAndApplyLogEntry: function (entry: string) {
+      this.recordLogEntry(entry);
+      this.applyLogEntry(entry);
+    },
+
+    replay: function () {
+      while (true) {
+        const entry = window.localStorage.getItem(`${next_log_index}`);
+        if (entry === null) {
+          break;
+        }
+        this.applyLogEntry(entry);
+        next_log_index++;
+      }
+    },
+  };
+})();
+
+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();
+    }
+  }
 }
 
 function browserCreateTask(form: any) {
-  addTask(form.taskName.value);
+  if (form.taskName.value) {
+    Log.addTask(form.taskName.value);
+  }
   form.taskName.value = "";
   return false;
 }
+
+function browserInit() {
+  document.body.addEventListener("keydown", handleKey, { capture: false });
+  Log.replay();
+}