Don't listen for keystrokes until log replay is done

[vopamoi] / vopamoi.ts

diff --git a/vopamoi.ts b/vopamoi.ts
index 1961dd995496a9fe6ecddb08f80b440435ef5f6d..633ffefba8a52067eb77584c1494cac78d45e4fd 100644 (file)
--- a/vopamoi.ts
+++ b/vopamoi.ts
@@ -1,40 +1,471 @@
+// 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));
+}
+
+// A clock that never goes backwards; monotonic.
+function Clock() {
+  var previousNow = Date.now();
+  return {
+    now: function (): number {
+      const now = Date.now();
+      if (now > previousNow) {
+        previousNow = now;
+        return now;
+      }
+      return ++previousNow;
+    },
+  };
+}
+const clock = Clock();
+
+// Returns a promise for a hue based on a hash of the string
+function hashHue(str: string) {
+  // Using crypto for this is overkill
+  return crypto.subtle.digest("SHA-256", new TextEncoder().encode(str)).then((buf) => (new Uint16Array(buf)[0] * 360) / 2 ** 16);
+}
+

 const Model = {
 const Model = {

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

     const task = document.createElement("div");
     const task = document.createElement("div");

-    task.appendChild(document.createTextNode(description));
+    const desc = document.createElement("span");
+    desc.textContent = description;
+    desc.classList.add("desc");
+    task.appendChild(desc);
+    task.classList.add("task");

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

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

     return task;
   },
 
     return task;
   },
 

-  addTask: function (description: string) {
-    document.body.appendChild(this.createTask(description));
+  addTag: function (createTimestamp: string, tagName: string): Element | null {
+    const task = this.getTask(createTimestamp);
+    if (!task) return null;
+    const existingTag = this.hasTag(task, tagName);
+    if (existingTag) return existingTag;
+    const tag = document.createElement("span");
+    tag.appendChild(document.createTextNode(tagName));
+    tag.classList.add("tag");
+    tag.setAttribute("tabindex", "0");
+    hashHue(tagName).then((hue) => (tag.style.backgroundColor = `hsl(${hue},90%,45%)`));
+    for (const child of task.getElementsByClassName("tag")) {
+      if (tagName > child.textContent!) {
+        task.insertBefore(tag, child);
+        return tag;
+      }
+    }
+    task.appendChild(tag);
+    return tag;

   },
 
   },
 

-  moveCursor: function (offset: number) {
-    var active = document.activeElement;
-    if (offset === 1 && active) {
-      active = active.nextElementSibling;
+  edit: function (createTimestamp: string, newDescription: string): Element | null {
+    const target = this.getTask(createTimestamp);
+    if (!target) return null;
+    if (target.hasAttribute("data-description")) {
+      // Oh no: An edit has arrived from a replica while a local edit is in progress.
+      const input = target.firstChild as HTMLInputElement;
+      if (
+        input.value === target.getAttribute("data-description") &&
+        input.selectionStart === input.value.length &&
+        input.selectionEnd === input.value.length
+      ) {
+        // No local changes have actually been made yet.  Change the contents of the edit box!
+        input.value = newDescription;
+      } else {
+        // No great options.
+        // Prefer not to interrupt the local user's edit.
+        // The remote edit is mostly lost; this mostly becomes last-write-wins.
+        target.setAttribute("data-description", newDescription);
+      }
+    } else {
+      target.getElementsByClassName("desc")[0].textContent = newDescription;

     }
     }

-    if (offset === -1 && active) {
-      active = active.previousElementSibling;
+    return target;
+  },
+
+  hasTag: function (task: Element, tag: string): Element | null {
+    for (const child of task.getElementsByClassName("tag")) {
+      if (child.textContent === tag) {
+        return child;
+      }
+    }
+    return null;
+  },
+
+  getPriority: function (task: Element): number {
+    if (task.hasAttribute("data-priority")) {
+      return parseFloat(task.getAttribute("data-priority")!);
+    }
+    return parseFloat(task.getAttribute("data-created")!);
+  },
+
+  getTask: function (createTimestamp: string) {
+    for (const task of document.getElementsByClassName("task")) {
+      if (task.getAttribute("data-created") === createTimestamp) {
+        return task;
+      }
+    }
+  },
+
+  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);
+        return target;
+      }
+    }
+    document.getElementById("tasks")!.appendChild(target);
+    return target;
+  },
+
+  setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
+    const task = this.getTask(createTimestamp);
+    if (task) {
+      task.setAttribute("data-state", state);

     }
     }

-    if (active && active instanceof HTMLElement) active.focus();

   },
 };
 
   },
 };
 

-function handleKey(event: any) {
-  if (event.target.tagName !== "INPUT") {
-    if (event.key == "j") Model.moveCursor(1);
-    if (event.key == "k") Model.moveCursor(-1);
-  }
+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 == "Edit") {
+        const [createTimestamp, description] = splitN(data, " ", 1);
+        return Model.edit(createTimestamp, description);
+      }
+      if (command == "Priority") {
+        const [createTimestamp, newPriority] = splitN(data, " ", 1);
+        return Model.setPriority(createTimestamp, parseFloat(newPriority));
+      }
+      if (command == "State") {
+        const [createTimestamp, state] = splitN(data, " ", 1);
+        return Model.setState(timestamp, createTimestamp, state);
+      }
+      if (command == "Tag") {
+        const [createTimestamp, tag] = splitN(data, " ", 1);
+        return Model.addTag(createTimestamp, tag);
+      }
+    },
+
+    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();
+
+function UI() {
+  const undoLog: string[] = [];
+  return {
+    addTask: function (description: string): Element {
+      const now = clock.now();
+      undoLog.push(`State ${now} deleted`);
+      return <Element>log.recordAndApply(`${now} Create ${description}`);
+    },
+    addTag: function (createTimestamp: string, tag: string) {
+      // TODO: undo
+      return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
+    },
+    edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
+      undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
+      return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
+    },
+    setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
+      undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
+      return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
+    },
+    setState: function (createTimestamp: string, newState: string, oldState: string) {
+      undoLog.push(`State ${createTimestamp} ${oldState}`);
+      return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
+    },
+    undo: function () {
+      if (undoLog.length > 0) {
+        return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
+      }
+    },
+  };

 }
 }

+const ui = UI();
+
+enum CommitOrAbort {
+  Commit,
+  Abort,
+}
+
+function BrowserUI() {
+  var currentViewState = "todo";
+  var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
+  var lastTagNameEntered = "";
+  return {
+    addTask: function (event: KeyboardEvent) {
+      const input = <HTMLInputElement>document.getElementById("taskName");
+      if (input.value) {
+        const task = ui.addTask(input.value);
+        if (currentViewState === "todo") {
+          task instanceof HTMLElement && task.focus();
+        } else if (this.returnFocusAfterInput()) {
+        } else {
+          this.firstVisibleTask()?.focus();
+        }
+        input.value = "";
+        if (event.getModifierState("Control")) {
+          this.setPriority(task, null, document.getElementsByClassName("task")[0]);
+        }
+      }
+    },
+
+    beginEdit: function (event: Event) {
+      const task = document.activeElement;
+      if (!task) return;
+      const input = document.createElement("input");
+      const desc = task.getElementsByClassName("desc")[0];
+      const oldDescription = desc.textContent!;
+      task.setAttribute("data-description", oldDescription);
+      input.value = oldDescription;
+      input.addEventListener("blur", this.completeEdit, { once: true });
+      desc.textContent = "";
+      task.insertBefore(input, task.firstChild);
+      input.focus();
+      event.preventDefault();
+    },
+
+    beginTagEdit: function (event: Event) {
+      const task = document.activeElement;
+      if (!task) return;
+      const input = document.createElement("input");
+      input.classList.add("tag");
+      input.addEventListener("blur", this.completeTagEdit, { once: true });
+      input.value = lastTagNameEntered;
+      task.appendChild(input);
+      input.focus();
+      input.select();
+      event.preventDefault();
+    },
+
+    completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
+      const input = event.target as HTMLInputElement;
+      const task = input.parentElement!;
+      const desc = task.getElementsByClassName("desc")[0];
+      const oldDescription = task.getAttribute("data-description")!;
+      const newDescription = input.value;
+      input.removeEventListener("blur", this.completeEdit);
+      task.removeChild(input);
+      task.removeAttribute("data-description");
+      task.focus();
+      if (newDescription === oldDescription || resolution === CommitOrAbort.Abort) {
+        desc.textContent = oldDescription;
+      } else {
+        ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
+      }
+    },
+
+    completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
+      const input = event.target as HTMLInputElement;
+      const task = input.parentElement!;
+      const newTagName = input.value;
+      input.removeEventListener("blur", this.completeTagEdit);
+      task.removeChild(input);
+      task.focus();
+      if (resolution === CommitOrAbort.Commit && newTagName && !Model.hasTag(task, newTagName)) {
+        ui.addTag(task.getAttribute("data-created")!, newTagName);
+        lastTagNameEntered = newTagName;
+      }
+    },
+
+    firstVisibleTask: function () {
+      for (const task of document.getElementsByClassName("task")) {
+        if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
+          return task;
+        }
+      }
+    },
+
+    focusTaskNameInput: function (event: Event) {
+      if (document.activeElement instanceof HTMLElement) {
+        taskFocusedBeforeJumpingToInput = document.activeElement;
+      }
+      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.getAttribute("data-state")! === currentViewState) {
+          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;
+    },

 
 

-function browserCreateTask(form: any) {
-  Model.addTask(form.taskName.value);
-  form.taskName.value = "";
-  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);
+      }
+    },
+
+    returnFocusAfterInput: function (): boolean {
+      if (taskFocusedBeforeJumpingToInput) {
+        taskFocusedBeforeJumpingToInput.focus();
+        return true;
+      }
+      return false;
+    },
+
+    // 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 ? clock.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));
+      task instanceof HTMLElement && task.focus();
+    },
+
+    setState: function (newState: string) {
+      const task = document.activeElement;
+      if (!task) return;
+      const oldState = task.getAttribute("data-state")!;
+      if (newState === oldState) return;
+      const createTimestamp = task.getAttribute("data-created")!;
+      this.moveCursor(1) || this.moveCursor(-1);
+      return ui.setState(createTimestamp, newState, oldState);
+    },
+
+    setView: function (state: string, color: string) {
+      const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
+      sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
+      sheet.insertRule(`:root { --view-state-indicator-color: ${color}; }`);
+      sheet.removeRule(2);
+      sheet.removeRule(2);
+      currentViewState = state;
+      if (document.activeElement?.getAttribute("data-state") !== state) {
+        this.firstVisibleTask()?.focus();
+      }
+    },
+
+    undo: function () {
+      const ret = ui.undo();
+      if (ret && ret instanceof HTMLElement) ret.focus();
+    },
+  };
+}
+const browserUI = BrowserUI();
+
+enum InputState {
+  Command,
+  View,
+}
+var inputState = InputState.Command;
+
+function handleKey(event: any) {
+  if (event.target.tagName === "INPUT") {
+    if (event.target.id === "taskName") {
+      if (event.key == "Enter") return browserUI.addTask(event);
+      if (event.key == "Escape") return browserUI.returnFocusAfterInput();
+    } else if (event.target.classList.contains("tag")) {
+      if (event.key == "Enter") return browserUI.completeTagEdit(event);
+      if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
+    } else {
+      if (event.key == "Enter") return browserUI.completeEdit(event);
+      if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
+    }
+  } else {
+    if (inputState === InputState.Command) {
+      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 == "c") return browserUI.setState("cancelled");
+      if (event.key == "d") return browserUI.setState("done");
+      if (event.key == "q") return browserUI.setState("todo");
+      if (event.key == "s") return browserUI.setState("someday-maybe");
+      if (event.key == "w") return browserUI.setState("waiting");
+      if (event.key == "X") return browserUI.setState("deleted");
+      if (event.key == "u") return browserUI.undo();
+      if (event.key == "e") return browserUI.beginEdit(event);
+      if (event.key == "t") return browserUI.beginTagEdit(event);
+      if (event.key == "v") return (inputState = InputState.View);
+    } else if (inputState === InputState.View) {
+      inputState = InputState.Command;
+      if (event.key == "c") return browserUI.setView("cancelled", "Red");
+      if (event.key == "d") return browserUI.setView("done", "LawnGreen");
+      if (event.key == "q") return browserUI.setView("todo", "White");
+      if (event.key == "s") return browserUI.setView("someday-maybe", "DeepSkyBlue");
+      if (event.key == "w") return browserUI.setView("waiting", "MediumOrchid");
+      if (event.key == "x") return browserUI.setView("deleted", "Black");
+    }
+  }

 }
 
 function browserInit() {
 }
 
 function browserInit() {

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

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