Undo for task creation and reordering

[vopamoi] / vopamoi.ts

diff --git a/vopamoi.ts b/vopamoi.ts
index 6cfdbf2d2f645a4ac24afd3554ea7455ce179ba3..a88408f639f3c8663ff16d92f38c4476741d93a3 100644 (file)
--- a/vopamoi.ts
+++ b/vopamoi.ts
@@ -14,61 +14,233 @@ function splitN(str: string, delimiter: string, limit: number = MAX_SAFE_INTEGER
 }
 
 const Model = {
 }
 
 const Model = {

-  createTask: function (description: string) {
+  addTask: function (timestamp: string, description: string): Element {

     const task = document.createElement("div");
     task.appendChild(document.createTextNode(description));
     const task = document.createElement("div");
     task.appendChild(document.createTextNode(description));

+    task.setAttribute("class", "task");

     task.setAttribute("tabindex", "0");
     task.setAttribute("tabindex", "0");

+    task.setAttribute("data-created", timestamp);
+    document.getElementById("tasks")!.appendChild(task);
+    task.focus();

     return task;
   },
 
     return task;
   },
 

-  addTask: function (description: string) {
-    document.body.appendChild(this.createTask(description)).focus();
+  getPriority: function (task: Element): number {
+    if (task.hasAttribute("data-priority")) {
+      return parseFloat(task.getAttribute("data-priority")!);
+    }
+    return parseFloat(task.getAttribute("data-created")!);

   },
 
   },
 

-  moveCursor: function (offset: number) {
-    var active = document.activeElement;
-    if (offset === 1 && active) {
-      active = active.nextElementSibling;
+  getTask: function (createTimestamp: string) {
+    for (const task of document.getElementsByClassName("task")) {
+      if (task.getAttribute("data-created") === createTimestamp) {
+        return task;
+      }

     }
     }

-    if (offset === -1 && active) {
-      active = active.previousElementSibling;
+  },
+
+  setPriority: function (createTimestamp: string, priority: number): Element | null {
+    const target = this.getTask(createTimestamp);
+    if (!target) return null;
+    target.setAttribute("data-priority", `${priority}`);
+    for (const task of document.getElementsByClassName("task")) {
+      if (task !== target && this.getPriority(task) > priority) {
+        task.parentElement!.insertBefore(target, task);
+        target instanceof HTMLElement && target.focus();
+        return target;
+      }

     }
     }

-    if (active && active instanceof HTMLElement) active.focus();
+    document.getElementById("tasks")!.appendChild(target);
+    target instanceof HTMLElement && target.focus();
+    return target;

   },
   },

-};

 
 

-const Log = {
-  addTask: function (description: string) {
-    this.applyLogEntry(`${Date.now()} Create ${description}`);
+  setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
+    const task = this.getTask(createTimestamp);
+    if (task) {
+      task.setAttribute(`data-${state}`, stateTimestamp);
+      if (task instanceof HTMLElement) {
+        task.style.display = "none"; // Until view filtering
+      }
+    }

   },
   },

+};
+
+function Log(prefix: string = "vp-") {
+  var next_log_index = 0;
+  return {
+    apply: function (entry: string) {
+      const [timestamp, command, data] = splitN(entry, " ", 2);
+      if (command == "Create") {
+        return Model.addTask(timestamp, data);
+      }
+      if (command == "State") {
+        const [createTimestamp, state] = splitN(data, " ", 1);
+        return Model.setState(timestamp, createTimestamp, state);
+      }
+      if (command == "Priority") {
+        const [createTimestamp, newPriority] = splitN(data, " ", 1);
+        return Model.setPriority(createTimestamp, parseFloat(newPriority));
+      }
+    },
+
+    record: function (entry: string) {
+      window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
+    },
+
+    recordAndApply: function (entry: string) {
+      this.record(entry);
+      return this.apply(entry);
+    },
+
+    replay: function () {
+      while (true) {
+        const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
+        if (entry === null) {
+          break;
+        }
+        this.apply(entry);
+        next_log_index++;
+      }
+    },
+  };
+}
+const log = Log();

 
 

-  applyLogEntry: function (entry: string) {
-    const [timestamp, command, data] = splitN(entry, " ", 2);
-    if (command == "Create") {
-      Model.addTask(data);
+const undoLog: string[] = [];
+
+const UI = {
+  addTask: function (description: string): Element {
+    const now = Date.now();
+    undoLog.push(`State ${now} deleted`);
+    return <Element>log.recordAndApply(`${now} Create ${description}`);
+  },
+  setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
+    undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
+    return log.recordAndApply(`${Date.now()} Priority ${createTimestamp} ${newPriority}`);
+  },
+  setState: function (createTimestamp: string, state: string) {
+    return log.recordAndApply(`${Date.now()} State ${createTimestamp} ${state}`);
+  },
+  undo: function () {
+    if (undoLog.length > 0) {
+      return log.recordAndApply(`${Date.now()} ${undoLog.pop()}`);

     }
   },
 };
 
     }
   },
 };
 

-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();
+const BrowserUI = {
+  addTask: function (event: KeyboardEvent) {
+    const input = <HTMLInputElement>document.getElementById("taskName");
+    if (input.value) {
+      const task = UI.addTask(input.value);
+      input.value = "";
+      if (event.getModifierState("Control")) {
+        this.setPriority(task, null, document.getElementsByClassName("task")[0]);
+      }

     }
     }

-  }
-}
+  },

 
 

-function browserCreateTask(form: any) {
-  if (form.taskName.value) {
-    Log.addTask(form.taskName.value);
+  firstVisibleTask: function () {
+    for (const task of document.getElementsByClassName("task")) {
+      if (task instanceof HTMLElement && task.style.display !== "none") {
+        return task;
+      }
+    }
+  },
+
+  focusTaskNameInput: function (event: Event) {
+    document.getElementById("taskName")!.focus();
+    event.preventDefault();
+  },
+
+  visibleTaskAtOffset(task: Element, offset: number): Element {
+    var cursor: Element | null = task;
+    var valid_cursor = cursor;
+    const increment = offset / Math.abs(offset);
+    while (true) {
+      cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
+      if (!cursor || !(cursor instanceof HTMLElement)) break;
+      if (cursor.style.display !== "none") {
+        offset -= increment;
+        valid_cursor = cursor;
+      }
+      if (Math.abs(offset) < 0.5) break;
+    }
+    return valid_cursor;
+  },
+
+  moveCursor: function (offset: number): boolean {
+    const active = document.activeElement;
+    if (!active) return false;
+    const dest = this.visibleTaskAtOffset(active, offset);
+    if (dest !== active && dest instanceof HTMLElement) {
+      dest.focus();
+      return true;
+    }
+    return false;
+  },
+
+  moveTask: function (offset: number) {
+    const active = document.activeElement;
+    if (!active) return;
+    const dest = this.visibleTaskAtOffset(active, offset);
+    if (dest === active) return; // Already extremal
+    var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
+    if (onePastDest == dest) onePastDest = null; // Will become extremal
+    if (offset > 0) {
+      this.setPriority(active, dest, onePastDest);
+    } else {
+      this.setPriority(active, onePastDest, dest);
+    }
+  },
+
+  // Change task's priority to be between other tasks a and b.
+  setPriority: function (task: Element, a: Element | null, b: Element | null) {
+    const aPriority = a === null ? 0 : Model.getPriority(a);
+    const bPriority = b === null ? Date.now() : Model.getPriority(b);
+    console.assert(aPriority < bPriority, aPriority, "<", bPriority);
+    const span = bPriority - aPriority;
+    const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
+    console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
+    const newPriorityRounded = Math.round(newPriority);
+    const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
+    UI.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
+  },
+
+  setState: function (state: string) {
+    const createTimestamp = document.activeElement?.getAttribute("data-created");
+    this.moveCursor(1) || this.moveCursor(-1);
+    return UI.setState(createTimestamp!, state);
+  },
+
+  undo: function () {
+    const ret = UI.undo();
+    if (ret && ret instanceof HTMLElement) ret.focus();
+  },
+};
+
+function handleKey(event: any) {
+  if (event.target.tagName === "INPUT") {
+    if (event.key == "Enter") return BrowserUI.addTask(event);
+  } else {
+    if (event.key == "j") return BrowserUI.moveCursor(1);
+    if (event.key == "k") return BrowserUI.moveCursor(-1);
+    if (event.key == "J") return BrowserUI.moveTask(1);
+    if (event.key == "K") return BrowserUI.moveTask(-1);
+    if (event.key == "n") return BrowserUI.focusTaskNameInput(event);
+    if (event.key == "s") return BrowserUI.setState("someday-maybe");
+    if (event.key == "w") return BrowserUI.setState("waiting");
+    if (event.key == "d") return BrowserUI.setState("done");
+    if (event.key == "c") return BrowserUI.setState("cancelled");
+    if (event.key == "X") return BrowserUI.setState("deleted");
+    if (event.key == "u") return BrowserUI.undo();

   }
   }

-  form.taskName.value = "";
-  return false;

 }
 
 function browserInit() {
   document.body.addEventListener("keydown", handleKey, { capture: false });
 }
 
 function browserInit() {
   document.body.addEventListener("keydown", handleKey, { capture: false });

+  log.replay();
+  BrowserUI.firstVisibleTask()?.focus();

 }
 }