X-Git-Url: http://git.scottworley.com/vopamoi/blobdiff_plain/d03daa19edde54d43693dca896f6fabade18d326..1f300e109962a47d2e1928018ea220d98dd0ab26:/vopamoi.ts

diff --git a/vopamoi.ts b/vopamoi.ts
index 59c2875..a76db5b 100644
--- a/vopamoi.ts
+++ b/vopamoi.ts
@@ -13,18 +13,64 @@ function splitN(str: string, delimiter: string, limit: number = MAX_SAFE_INTEGER
   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();
+
 const Model = {
-  createTask: function (timestamp: string, description: string) {
+  addTask: function (timestamp: string, description: string): Element {
     const task = document.createElement("div");
     task.appendChild(document.createTextNode(description));
     task.setAttribute("class", "task");
     task.setAttribute("tabindex", "0");
     task.setAttribute("data-created", timestamp);
+    task.setAttribute("data-state", "todo");
+    document.getElementById("tasks")!.appendChild(task);
     return task;
   },
 
-  addTask: function (timestamp: string, description: string) {
-    document.body.appendChild(this.createTask(timestamp, description)).focus();
+  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.children[0] 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.textContent = newDescription;
+    }
+    return target;
+  },
+
+  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) {
@@ -35,20 +81,24 @@ const Model = {
     }
   },
 
-  destroyTask: function (createTimestamp: string) {
-    const task = this.getTask(createTimestamp);
-    if (task) {
-      task.parentElement!.removeChild(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}`, stateTimestamp);
-      if (task instanceof HTMLElement) {
-        task.style.display = "none"; // Until view filtering
-      }
+      task.setAttribute("data-state", state);
     }
   },
 };
@@ -59,14 +109,19 @@ function Log(prefix: string = "vp-") {
     apply: function (entry: string) {
       const [timestamp, command, data] = splitN(entry, " ", 2);
       if (command == "Create") {
-        Model.addTask(timestamp, data);
+        return Model.addTask(timestamp, data);
       }
-      if (command == "Destroy") {
-        Model.destroyTask(data.split(" ", 1)[0]);
+      if (command == "Edit") {
+        const [createTimestamp, description] = splitN(data, " ", 1);
+        return Model.edit(createTimestamp, description);
       }
       if (command == "State") {
         const [createTimestamp, state] = splitN(data, " ", 1);
-        Model.setState(timestamp, createTimestamp, state);
+        return Model.setState(timestamp, createTimestamp, state);
+      }
+      if (command == "Priority") {
+        const [createTimestamp, newPriority] = splitN(data, " ", 1);
+        return Model.setPriority(createTimestamp, parseFloat(newPriority));
       }
     },
 
@@ -76,7 +131,7 @@ function Log(prefix: string = "vp-") {
 
     recordAndApply: function (entry: string) {
       this.record(entry);
-      this.apply(entry);
+      return this.apply(entry);
     },
 
     replay: function () {
@@ -93,74 +148,243 @@ function Log(prefix: string = "vp-") {
 }
 const log = Log();
 
-const UI = {
-  addTask: function (description: string) {
-    log.recordAndApply(`${Date.now()} Create ${description}`);
-  },
-  destroyTask: function (createTimestamp: string) {
-    log.recordAndApply(`${Date.now()} Destroy ${createTimestamp} ${Model.getTask(createTimestamp)?.textContent}`);
-  },
-  setState: function (createTimestamp: string, state: string) {
-    log.recordAndApply(`${Date.now()} State ${createTimestamp} ${state}`);
-  },
-};
+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}`);
+    },
+    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();
 
-const BrowserUI = {
-  addTask: function (form: any) {
-    if (form.taskName.value) {
-      UI.addTask(form.taskName.value);
-      form.taskName.value = "";
-    }
-    return false;
-  },
+enum CommitOrAbort {
+  Commit,
+  Abort,
+}
 
-  destroyTask: function () {
-    const createTimestamp = document.activeElement?.getAttribute("data-created");
-    this.moveCursor(1) || this.moveCursor(-1);
-    return UI.destroyTask(createTimestamp!);
-  },
+function BrowserUI() {
+  var currentViewState = "todo";
+  var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
+  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]);
+        }
+      }
+    },
 
-  focusTaskNameInput: function (event: any) {
-    document.getElementById("taskName")!.focus();
-    event.preventDefault();
-  },
+    beginEdit: function (event: Event) {
+      const task = document.activeElement;
+      if (!task) return;
+      const input = document.createElement("input");
+      const oldDescription = task.textContent!;
+      task.setAttribute("data-description", oldDescription);
+      input.value = oldDescription;
+      input.addEventListener("blur", this.completeEdit, { once: true });
+      task.textContent = "";
+      task.appendChild(input);
+      input.focus();
+      event.preventDefault();
+    },
 
-  moveCursor: function (offset: number): boolean {
-    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();
-      return true;
-    }
-    return false;
-  },
+    completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
+      const input = event.target as HTMLInputElement;
+      const task = input.parentElement!;
+      const oldDescription = task.getAttribute("data-description")!;
+      const newDescription = input.value;
+      input.removeEventListener("blur", this.completeEdit);
+      task.removeChild(task.children[0]);
+      task.removeAttribute("data-description");
+      task.focus();
+      if (newDescription === oldDescription || resolution === CommitOrAbort.Abort) {
+        task.textContent = oldDescription;
+      } else {
+        ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
+      }
+    },
 
-  setState: function (state: string) {
-    const createTimestamp = document.activeElement?.getAttribute("data-created");
-    this.moveCursor(1) || this.moveCursor(-1);
-    return UI.setState(createTimestamp!, state);
-  },
-};
+    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;
+    },
+
+    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) {
+      const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
+      sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
+      sheet.removeRule(1);
+      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.key == "j") return BrowserUI.moveCursor(1);
-    if (event.key == "k") return BrowserUI.moveCursor(-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.destroyTask();
+  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.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 == "v") return (inputState = InputState.View);
+    } else if (inputState === InputState.View) {
+      inputState = InputState.Command;
+      if (event.key == "c") return browserUI.setView("cancelled");
+      if (event.key == "d") return browserUI.setView("done");
+      if (event.key == "q") return browserUI.setView("todo");
+      if (event.key == "s") return browserUI.setView("someday-maybe");
+      if (event.key == "w") return browserUI.setView("waiting");
+      if (event.key == "x") return browserUI.setView("deleted");
+    }
   }
 }
 
 function browserInit() {
   document.body.addEventListener("keydown", handleKey, { capture: false });
   log.replay();
+  browserUI.firstVisibleTask()?.focus();
 }