git.scottworley.com Git - vopamoi/blob - vopamoi.ts

   1 // Typescript doesn't know about MAX_SAFE_INTEGER??  This was supposed to be
   2 // fixed in typescript 2.0.1 in 2016, but is not working for me in typescript
   3 // 4.2.4 in 2022.  :( https://github.com/microsoft/TypeScript/issues/9937
   4 //const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER;
   5 const MAX_SAFE_INTEGER = 9007199254740991;
   6
   7 // A sane split that splits N *times*, leaving the last chunk unsplit.
   8 function splitN(str: string, delimiter: string, limit: number = MAX_SAFE_INTEGER): string[] {
   9   if (limit < 1) {
  10     return [str];
  11   }
  12   const at = str.indexOf(delimiter);
  13   return at === -1 ? [str] : [str.substring(0, at)].concat(splitN(str.substring(at + delimiter.length), delimiter, limit - 1));
  14 }
  15
  16 // A clock that never goes backwards; monotonic.
  17 function Clock() {
  18   var previousNow = Date.now();
  19   return {
  20     now: function (): number {
  21       const now = Date.now();
  22       if (now > previousNow) {
  23         previousNow = now;
  24         return now;
  25       }
  26       return ++previousNow;
  27     },
  28   };
  29 }
  30 const clock = Clock();
  31
  32 const Model = {
  33   addTask: function (timestamp: string, description: string): Element {
  34     const task = document.createElement("div");
  35     task.appendChild(document.createTextNode(description));
  36     task.setAttribute("class", "task");
  37     task.setAttribute("tabindex", "0");
  38     task.setAttribute("data-created", timestamp);
  39     task.setAttribute("data-state", "todo");
  40     document.getElementById("tasks")!.appendChild(task);
  41     return task;
  42   },
  43
  44   edit: function (createTimestamp: string, newDescription: string): Element | null {
  45     const target = this.getTask(createTimestamp);
  46     if (!target) return null;
  47     if (target.hasAttribute("data-description")) {
  48       // Oh no: An edit has arrived from a replica while a local edit is in progress.
  49       const input = target.children[0] as HTMLInputElement;
  50       if (
  51         input.value === target.getAttribute("data-description") &&
  52         input.selectionStart === 0 &&
  53         input.selectionEnd === input.value.length
  54       ) {
  55         // No local changes have actually been made yet.  Change the contents of the edit box!
  56         input.value = newDescription;
  57         input.select();
  58       } else {
  59         // No great options.
  60         // Prefer not to interrupt the local user's edit.
  61         // The remote edit is mostly lost; this mostly becomes last-write-wins.
  62         target.setAttribute("data-description", newDescription);
  63       }
  64     } else {
  65       target.textContent = newDescription;
  66     }
  67     return target;
  68   },
  69
  70   getPriority: function (task: Element): number {
  71     if (task.hasAttribute("data-priority")) {
  72       return parseFloat(task.getAttribute("data-priority")!);
  73     }
  74     return parseFloat(task.getAttribute("data-created")!);
  75   },
  76
  77   getTask: function (createTimestamp: string) {
  78     for (const task of document.getElementsByClassName("task")) {
  79       if (task.getAttribute("data-created") === createTimestamp) {
  80         return task;
  81       }
  82     }
  83   },
  84
  85   setPriority: function (createTimestamp: string, priority: number): Element | null {
  86     const target = this.getTask(createTimestamp);
  87     if (!target) return null;
  88     target.setAttribute("data-priority", `${priority}`);
  89     for (const task of document.getElementsByClassName("task")) {
  90       if (task !== target && this.getPriority(task) > priority) {
  91         task.parentElement!.insertBefore(target, task);
  92         return target;
  93       }
  94     }
  95     document.getElementById("tasks")!.appendChild(target);
  96     return target;
  97   },
  98
  99   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 100     const task = this.getTask(createTimestamp);
 101     if (task) {
 102       task.setAttribute("data-state", state);
 103     }
 104   },
 105 };
 106
 107 function Log(prefix: string = "vp-") {
 108   var next_log_index = 0;
 109   return {
 110     apply: function (entry: string) {
 111       const [timestamp, command, data] = splitN(entry, " ", 2);
 112       if (command == "Create") {
 113         return Model.addTask(timestamp, data);
 114       }
 115       if (command == "Edit") {
 116         const [createTimestamp, description] = splitN(data, " ", 1);
 117         return Model.edit(createTimestamp, description);
 118       }
 119       if (command == "State") {
 120         const [createTimestamp, state] = splitN(data, " ", 1);
 121         return Model.setState(timestamp, createTimestamp, state);
 122       }
 123       if (command == "Priority") {
 124         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 125         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 126       }
 127     },
 128
 129     record: function (entry: string) {
 130       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 131     },
 132
 133     recordAndApply: function (entry: string) {
 134       this.record(entry);
 135       return this.apply(entry);
 136     },
 137
 138     replay: function () {
 139       while (true) {
 140         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 141         if (entry === null) {
 142           break;
 143         }
 144         this.apply(entry);
 145         next_log_index++;
 146       }
 147     },
 148   };
 149 }
 150 const log = Log();
 151
 152 function UI() {
 153   const undoLog: string[] = [];
 154   return {
 155     addTask: function (description: string): Element {
 156       const now = clock.now();
 157       undoLog.push(`State ${now} deleted`);
 158       return <Element>log.recordAndApply(`${now} Create ${description}`);
 159     },
 160     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 161       undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 162       return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 163     },
 164     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 165       undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 166       return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 167     },
 168     setState: function (createTimestamp: string, newState: string, oldState: string) {
 169       undoLog.push(`State ${createTimestamp} ${oldState}`);
 170       return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 171     },
 172     undo: function () {
 173       if (undoLog.length > 0) {
 174         return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 175       }
 176     },
 177   };
 178 }
 179 const ui = UI();
 180
 181 function BrowserUI() {
 182   var currentViewState = "todo";
 183   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 184   return {
 185     addTask: function (event: KeyboardEvent) {
 186       const input = <HTMLInputElement>document.getElementById("taskName");
 187       if (input.value) {
 188         const task = ui.addTask(input.value);
 189         if (currentViewState === "todo") {
 190           task instanceof HTMLElement && task.focus();
 191         } else if (this.returnFocusAfterInput()) {
 192         } else {
 193           this.firstVisibleTask()?.focus();
 194         }
 195         input.value = "";
 196         if (event.getModifierState("Control")) {
 197           this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 198         }
 199       }
 200     },
 201
 202     beginEdit: function (event: Event) {
 203       const task = document.activeElement;
 204       if (!task) return;
 205       const input = document.createElement("input");
 206       const oldDescription = task.textContent!;
 207       task.setAttribute("data-description", oldDescription);
 208       input.value = oldDescription;
 209       input.addEventListener("blur", this.completeEdit, { once: true });
 210       task.textContent = "";
 211       task.appendChild(input);
 212       input.focus();
 213       input.select();
 214       event.preventDefault();
 215     },
 216
 217     completeEdit: function (event: Event) {
 218       const input = event.target as HTMLInputElement;
 219       const task = input.parentElement!;
 220       const oldDescription = task.getAttribute("data-description")!;
 221       const newDescription = input.value;
 222       input.removeEventListener("blur", this.completeEdit);
 223       task.removeChild(task.children[0]);
 224       task.removeAttribute("data-description");
 225       task.focus();
 226       if (newDescription === oldDescription) {
 227         task.textContent = oldDescription;
 228       } else {
 229         ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 230       }
 231     },
 232
 233     firstVisibleTask: function () {
 234       for (const task of document.getElementsByClassName("task")) {
 235         if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
 236           return task;
 237         }
 238       }
 239     },
 240
 241     focusTaskNameInput: function (event: Event) {
 242       if (document.activeElement instanceof HTMLElement) {
 243         taskFocusedBeforeJumpingToInput = document.activeElement;
 244       }
 245       document.getElementById("taskName")!.focus();
 246       event.preventDefault();
 247     },
 248
 249     visibleTaskAtOffset(task: Element, offset: number): Element {
 250       var cursor: Element | null = task;
 251       var valid_cursor = cursor;
 252       const increment = offset / Math.abs(offset);
 253       while (true) {
 254         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 255         if (!cursor || !(cursor instanceof HTMLElement)) break;
 256         if (cursor.getAttribute("data-state")! === currentViewState) {
 257           offset -= increment;
 258           valid_cursor = cursor;
 259         }
 260         if (Math.abs(offset) < 0.5) break;
 261       }
 262       return valid_cursor;
 263     },
 264
 265     moveCursor: function (offset: number): boolean {
 266       const active = document.activeElement;
 267       if (!active) return false;
 268       const dest = this.visibleTaskAtOffset(active, offset);
 269       if (dest !== active && dest instanceof HTMLElement) {
 270         dest.focus();
 271         return true;
 272       }
 273       return false;
 274     },
 275
 276     moveTask: function (offset: number) {
 277       const active = document.activeElement;
 278       if (!active) return;
 279       const dest = this.visibleTaskAtOffset(active, offset);
 280       if (dest === active) return; // Already extremal
 281       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 282       if (onePastDest == dest) onePastDest = null; // Will become extremal
 283       if (offset > 0) {
 284         this.setPriority(active, dest, onePastDest);
 285       } else {
 286         this.setPriority(active, onePastDest, dest);
 287       }
 288     },
 289
 290     returnFocusAfterInput: function (): boolean {
 291       if (taskFocusedBeforeJumpingToInput) {
 292         taskFocusedBeforeJumpingToInput.focus();
 293         return true;
 294       }
 295       return false;
 296     },
 297
 298     // Change task's priority to be between other tasks a and b.
 299     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 300       const aPriority = a === null ? 0 : Model.getPriority(a);
 301       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 302       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 303       const span = bPriority - aPriority;
 304       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 305       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 306       const newPriorityRounded = Math.round(newPriority);
 307       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 308       ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 309       task instanceof HTMLElement && task.focus();
 310     },
 311
 312     setState: function (newState: string) {
 313       const task = document.activeElement;
 314       if (!task) return;
 315       const oldState = task.getAttribute("data-state")!;
 316       if (newState === oldState) return;
 317       const createTimestamp = task.getAttribute("data-created")!;
 318       this.moveCursor(1) || this.moveCursor(-1);
 319       return ui.setState(createTimestamp, newState, oldState);
 320     },
 321
 322     setView: function (state: string) {
 323       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 324       sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 325       sheet.removeRule(1);
 326       currentViewState = state;
 327       if (document.activeElement?.getAttribute("data-state") !== state) {
 328         this.firstVisibleTask()?.focus();
 329       }
 330     },
 331
 332     undo: function () {
 333       const ret = ui.undo();
 334       if (ret && ret instanceof HTMLElement) ret.focus();
 335     },
 336   };
 337 }
 338 const browserUI = BrowserUI();
 339
 340 enum InputState {
 341   Command,
 342   View,
 343 }
 344 var inputState = InputState.Command;
 345
 346 function handleKey(event: any) {
 347   if (event.target.tagName === "INPUT") {
 348     if (event.target.id === "taskName") {
 349       if (event.key == "Enter") return browserUI.addTask(event);
 350       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 351     } else {
 352       if (event.key == "Enter") return browserUI.completeEdit(event);
 353     }
 354   } else {
 355     if (inputState === InputState.Command) {
 356       if (event.key == "j") return browserUI.moveCursor(1);
 357       if (event.key == "k") return browserUI.moveCursor(-1);
 358       if (event.key == "J") return browserUI.moveTask(1);
 359       if (event.key == "K") return browserUI.moveTask(-1);
 360       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 361       if (event.key == "c") return browserUI.setState("cancelled");
 362       if (event.key == "d") return browserUI.setState("done");
 363       if (event.key == "s") return browserUI.setState("someday-maybe");
 364       if (event.key == "t") return browserUI.setState("todo");
 365       if (event.key == "w") return browserUI.setState("waiting");
 366       if (event.key == "X") return browserUI.setState("deleted");
 367       if (event.key == "u") return browserUI.undo();
 368       if (event.key == "e") return browserUI.beginEdit(event);
 369       if (event.key == "v") return (inputState = InputState.View);
 370     } else if (inputState === InputState.View) {
 371       inputState = InputState.Command;
 372       if (event.key == "c") return browserUI.setView("cancelled");
 373       if (event.key == "d") return browserUI.setView("done");
 374       if (event.key == "s") return browserUI.setView("someday-maybe");
 375       if (event.key == "t") return browserUI.setView("todo");
 376       if (event.key == "w") return browserUI.setView("waiting");
 377       if (event.key == "x") return browserUI.setView("deleted");
 378     }
 379   }
 380 }
 381
 382 function browserInit() {
 383   document.body.addEventListener("keydown", handleKey, { capture: false });
 384   log.replay();
 385   browserUI.firstVisibleTask()?.focus();
 386 }