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 // Returns a promise for a hue based on a hash of the string
  33 function hashHue(str: string) {
  34   // Using crypto for this is overkill
  35   return crypto.subtle.digest("SHA-256", new TextEncoder().encode(str)).then((buf) => (new Uint16Array(buf)[0] * 360) / 2 ** 16);
  36 }
  37
  38 function Model() {
  39   return {
  40     addTask: function (timestamp: string, description: string): Element {
  41       const task = document.createElement("div");
  42       const desc = document.createElement("span");
  43       desc.textContent = description;
  44       desc.classList.add("desc");
  45       task.appendChild(desc);
  46       task.classList.add("task");
  47       task.setAttribute("tabindex", "0");
  48       task.setAttribute("id", timestamp);
  49       task.setAttribute("data-state", "todo");
  50       const tasks = document.getElementById("tasks")!;
  51       tasks.insertBefore(task, tasks.firstElementChild);
  52       return task;
  53     },
  54
  55     addTag: function (createTimestamp: string, tagName: string): Element | null {
  56       const task = this.getTask(createTimestamp);
  57       if (!task) return null;
  58       const existingTag = this.hasTag(task, tagName);
  59       if (existingTag) return existingTag;
  60       const tag = document.createElement("span");
  61       tag.appendChild(document.createTextNode(tagName));
  62       tag.classList.add("tag");
  63       tag.setAttribute("tabindex", "0");
  64       hashHue(tagName).then((hue) => (tag.style.backgroundColor = `hsl(${hue},90%,45%)`));
  65       for (const child of task.getElementsByClassName("tag")) {
  66         if (tagName > child.textContent!) {
  67           task.insertBefore(tag, child);
  68           return tag;
  69         }
  70       }
  71       task.insertBefore(tag, task.getElementsByClassName("desc")[0]!);
  72       return tag;
  73     },
  74
  75     edit: function (createTimestamp: string, newDescription: string): Element | null {
  76       const target = this.getTask(createTimestamp);
  77       if (!target) return null;
  78       if (target.hasAttribute("data-description")) {
  79         // Oh no: An edit has arrived from a replica while a local edit is in progress.
  80         const input = target.getElementsByTagName("input")[0]!;
  81         if (
  82           input.value === target.getAttribute("data-description") &&
  83           input.selectionStart === input.value.length &&
  84           input.selectionEnd === input.value.length
  85         ) {
  86           // No local changes have actually been made yet.  Change the contents of the edit box!
  87           input.value = newDescription;
  88         } else {
  89           // No great options.
  90           // Prefer not to interrupt the local user's edit.
  91           // The remote edit is mostly lost; this mostly becomes last-write-wins.
  92           target.setAttribute("data-description", newDescription);
  93         }
  94       } else {
  95         target.getElementsByClassName("desc")[0].textContent = newDescription;
  96       }
  97       return target;
  98     },
  99
 100     editContent: function (createTimestamp: string, newContent: string): Element | null {
 101       const target = this.getTask(createTimestamp);
 102       if (!target) return null;
 103       if (target.hasAttribute("data-content")) {
 104         // Oh no: An edit has arrived from a replica while a local edit is in progress.
 105         const input = target.getElementsByTagName("textarea")[0]!;
 106         if (
 107           input.value === target.getAttribute("data-content") &&
 108           input.selectionStart === input.value.length &&
 109           input.selectionEnd === input.value.length
 110         ) {
 111           // No local changes have actually been made yet.  Change the contents of the edit box!
 112           input.value = newContent;
 113         } else {
 114           // No great options.
 115           // Prefer not to interrupt the local user's edit.
 116           // The remote edit is mostly lost; this mostly becomes last-write-wins.
 117           target.setAttribute("data-content", newContent);
 118         }
 119       } else {
 120         var content = target.getElementsByClassName("content")[0];
 121         if (!content) {
 122           content = document.createElement("div");
 123           content.classList.add("content");
 124           target.appendChild(content);
 125         }
 126         content.textContent = newContent;
 127       }
 128       return target;
 129     },
 130
 131     hasTag: function (task: Element, tag: string): Element | null {
 132       for (const child of task.getElementsByClassName("tag")) {
 133         if (child.textContent === tag) {
 134           return child;
 135         }
 136       }
 137       return null;
 138     },
 139
 140     getPriority: function (task: Element): number {
 141       if (task.hasAttribute("data-priority")) {
 142         return parseFloat(task.getAttribute("data-priority")!);
 143       }
 144       return parseFloat(task.getAttribute("id")!);
 145     },
 146
 147     getTask: function (createTimestamp: string) {
 148       return document.getElementById(createTimestamp);
 149     },
 150
 151     insertInPriorityOrder: function (task: Element, dest: Element) {
 152       const priority = this.getPriority(task);
 153       for (const t of dest.children) {
 154         if (t !== task && this.getPriority(t) < priority) {
 155           dest.insertBefore(task, t);
 156           return;
 157         }
 158       }
 159       dest.appendChild(task);
 160     },
 161
 162     removeTag: function (createTimestamp: string, tagName: string) {
 163       const task = this.getTask(createTimestamp);
 164       if (!task) return null;
 165       const tag = this.hasTag(task, tagName);
 166       if (!tag) return;
 167       task.removeChild(tag);
 168       if (task instanceof HTMLElement) task.focus();
 169     },
 170
 171     setPriority: function (createTimestamp: string, priority: number): Element | null {
 172       const target = this.getTask(createTimestamp);
 173       if (!target) return null;
 174       target.setAttribute("data-priority", `${priority}`);
 175       this.insertInPriorityOrder(target, target.parentElement!);
 176       return target;
 177     },
 178
 179     setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 180       const task = this.getTask(createTimestamp);
 181       if (!task) return;
 182       task.setAttribute("data-state", state);
 183       var date = task.getElementsByClassName("statedate")[0];
 184       if (state === "todo") {
 185         task.removeChild(date);
 186         return;
 187       }
 188       if (!date) {
 189         date = document.createElement("span");
 190         date.classList.add("statedate");
 191         task.insertBefore(date, task.firstChild);
 192       }
 193       const d = new Date(parseInt(stateTimestamp));
 194       date.textContent = `${d.getFullYear()}-${`${d.getMonth() + 1}`.padStart(2, "0")}-${`${d.getDate()}`.padStart(2, "0")}`;
 195     },
 196   };
 197 }
 198 const model = Model();
 199
 200 function Log(prefix: string = "vp-") {
 201   var next_log_index = 0;
 202   return {
 203     apply: function (entry: string) {
 204       const [timestamp, command, data] = splitN(entry, " ", 2);
 205       if (command == "Create") {
 206         return model.addTask(timestamp, data);
 207       }
 208       if (command == "Edit") {
 209         const [createTimestamp, description] = splitN(data, " ", 1);
 210         return model.edit(createTimestamp, description);
 211       }
 212       if (command == "EditContent") {
 213         const [createTimestamp, content] = splitN(data, " ", 1);
 214         return model.editContent(createTimestamp, content);
 215       }
 216       if (command == "Priority") {
 217         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 218         return model.setPriority(createTimestamp, parseFloat(newPriority));
 219       }
 220       if (command == "State") {
 221         const [createTimestamp, state] = splitN(data, " ", 1);
 222         return model.setState(timestamp, createTimestamp, state);
 223       }
 224       if (command == "Tag") {
 225         const [createTimestamp, tag] = splitN(data, " ", 1);
 226         return model.addTag(createTimestamp, tag);
 227       }
 228       if (command == "Untag") {
 229         const [createTimestamp, tag] = splitN(data, " ", 1);
 230         return model.removeTag(createTimestamp, tag);
 231       }
 232     },
 233
 234     record: function (entry: string) {
 235       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 236     },
 237
 238     recordAndApply: function (entry: string) {
 239       this.record(entry);
 240       return this.apply(entry);
 241     },
 242
 243     replay: function () {
 244       document.getElementById("tasks")!.style.display = "none";
 245       while (true) {
 246         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 247         if (entry === null) {
 248           break;
 249         }
 250         this.apply(entry);
 251         next_log_index++;
 252       }
 253       document.getElementById("tasks")!.style.display = "";
 254     },
 255   };
 256 }
 257 const log = Log();
 258
 259 function UI() {
 260   const undoLog: string[][] = [];
 261   const redoLog: string[][] = [];
 262   function perform(forward: string, reverse: string) {
 263     undoLog.push([reverse, forward]);
 264     return log.recordAndApply(`${clock.now()} ${forward}`);
 265   }
 266   return {
 267     addTask: function (description: string): Element {
 268       const now = clock.now();
 269       undoLog.push([`State ${now} deleted`, `State ${now} todo`]);
 270       return <Element>log.recordAndApply(`${now} Create ${description}`);
 271     },
 272     addTag: function (createTimestamp: string, tag: string) {
 273       return perform(`Tag ${createTimestamp} ${tag}`, `Untag ${createTimestamp} ${tag}`);
 274     },
 275     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 276       return perform(`Edit ${createTimestamp} ${newDescription}`, `Edit ${createTimestamp} ${oldDescription}`);
 277     },
 278     editContent: function (createTimestamp: string, newContent: string, oldContent: string) {
 279       return perform(`EditContent ${createTimestamp} ${newContent}`, `EditContent ${createTimestamp} ${oldContent}`);
 280     },
 281     removeTag: function (createTimestamp: string, tag: string) {
 282       return perform(`Untag ${createTimestamp} ${tag}`, `Tag ${createTimestamp} ${tag}`);
 283     },
 284     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 285       return perform(`Priority ${createTimestamp} ${newPriority}`, `Priority ${createTimestamp} ${oldPriority}`);
 286     },
 287     setState: function (createTimestamp: string, newState: string, oldState: string) {
 288       return perform(`State ${createTimestamp} ${newState}`, `State ${createTimestamp} ${oldState}`);
 289     },
 290     undo: function () {
 291       const entry = undoLog.pop();
 292       if (entry) {
 293         redoLog.push(entry);
 294         return log.recordAndApply(`${clock.now()} ${entry[0]}`);
 295       }
 296     },
 297     redo: function () {
 298       const entry = redoLog.pop();
 299       if (entry) {
 300         undoLog.push(entry);
 301         return log.recordAndApply(`${clock.now()} ${entry[1]}`);
 302       }
 303     },
 304   };
 305 }
 306 const ui = UI();
 307
 308 enum CommitOrAbort {
 309   Commit,
 310   Abort,
 311 }
 312
 313 interface TagFilter {
 314   description: string;
 315   include: (task: Element) => boolean;
 316 }
 317
 318 function BrowserUI() {
 319   const viewColors: { [key: string]: string } = {
 320     all: "Gold",
 321     cancelled: "Red",
 322     deleted: "Black",
 323     done: "LawnGreen",
 324     "someday-maybe": "DeepSkyBlue",
 325     todo: "rgb(0 0 0 / 0)",
 326     waiting: "MediumOrchid",
 327   };
 328   var currentTagFilter: TagFilter | null = null;
 329   var currentViewState = "todo";
 330   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 331   var lastTagNameEntered = "";
 332   return {
 333     addTask: function (event: KeyboardEvent) {
 334       const input = <HTMLInputElement>document.getElementById("taskName");
 335       if (input.value.match(/^ *$/)) return;
 336       const task = ui.addTask(input.value);
 337       if (currentViewState === "todo" || currentViewState === "all") {
 338         task instanceof HTMLElement && task.focus();
 339       } else if (this.returnFocusAfterInput()) {
 340       } else {
 341         this.firstVisibleTask()?.focus();
 342       }
 343       input.value = "";
 344       if (event.getModifierState("Control")) {
 345         this.makeBottomPriority(task);
 346       }
 347     },
 348
 349     beginEdit: function (event: Event) {
 350       const task = this.currentTask();
 351       if (!task) return;
 352       const input = document.createElement("input");
 353       const desc = task.getElementsByClassName("desc")[0];
 354       const oldDescription = desc.textContent!;
 355       task.setAttribute("data-description", oldDescription);
 356       input.value = oldDescription;
 357       input.addEventListener("blur", this.completeEdit, { once: true });
 358       desc.textContent = "";
 359       task.insertBefore(input, task.firstChild);
 360       input.focus();
 361       event.preventDefault();
 362     },
 363
 364     beginEditContent: function (event: Event) {
 365       const task = this.currentTask();
 366       if (!task) return;
 367       const input = document.createElement("textarea");
 368       const content = task.getElementsByClassName("content")[0];
 369       const oldContent = content?.textContent ?? "";
 370       task.setAttribute("data-content", oldContent);
 371       input.value = oldContent;
 372       input.addEventListener("blur", this.completeContentEdit, { once: true });
 373       if (content) content.textContent = "";
 374       task.appendChild(input);
 375       input.focus();
 376       event.preventDefault();
 377     },
 378
 379     beginTagEdit: function (event: Event) {
 380       const task = this.currentTask();
 381       if (!task) return;
 382       const input = document.createElement("input");
 383       input.classList.add("tag");
 384       input.addEventListener("blur", this.completeTagEdit, { once: true });
 385       input.value = lastTagNameEntered;
 386       task.appendChild(input);
 387       input.focus();
 388       input.select();
 389       event.preventDefault();
 390     },
 391
 392     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 393       const input = event.target as HTMLInputElement;
 394       const task = input.parentElement!;
 395       const desc = task.getElementsByClassName("desc")[0];
 396       const oldDescription = task.getAttribute("data-description")!;
 397       const newDescription = input.value;
 398       input.removeEventListener("blur", this.completeEdit);
 399       task.removeChild(input);
 400       task.removeAttribute("data-description");
 401       task.focus();
 402       if (resolution === CommitOrAbort.Abort || newDescription.match(/^ *$/) || newDescription === oldDescription) {
 403         desc.textContent = oldDescription;
 404       } else {
 405         ui.edit(task.getAttribute("id")!, newDescription, oldDescription);
 406       }
 407     },
 408
 409     completeContentEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 410       const input = event.target as HTMLInputElement;
 411       const task = input.parentElement!;
 412       const content = task.getElementsByClassName("content")[0];
 413       const oldContent = task.getAttribute("data-content")!;
 414       const newContent = input.value;
 415       input.removeEventListener("blur", this.completeContentEdit);
 416       task.removeChild(input);
 417       task.removeAttribute("data-content");
 418       task.focus();
 419       if (resolution === CommitOrAbort.Abort || newContent === oldContent) {
 420         if (content) content.textContent = oldContent;
 421       } else {
 422         ui.editContent(task.getAttribute("id")!, newContent, oldContent);
 423       }
 424     },
 425
 426     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 427       const input = event.target as HTMLInputElement;
 428       const task = input.parentElement!;
 429       const newTagName = input.value;
 430       input.removeEventListener("blur", this.completeTagEdit);
 431       task.removeChild(input);
 432       task.focus();
 433       if (resolution === CommitOrAbort.Commit && !newTagName.match(/^ *$/) && !model.hasTag(task, newTagName)) {
 434         ui.addTag(task.getAttribute("id")!, newTagName);
 435         lastTagNameEntered = newTagName;
 436       }
 437     },
 438
 439     currentTag: function (): Element | null {
 440       var target = document.activeElement;
 441       if (!target) return null;
 442       if (target.classList.contains("task")) {
 443         const tags = target.getElementsByClassName("tag");
 444         target = tags[tags.length - 1];
 445       }
 446       if (!target || !target.classList.contains("tag")) return null;
 447       return target;
 448     },
 449
 450     currentTask: function (): HTMLElement | null {
 451       var target = document.activeElement;
 452       if (!target) return null;
 453       if (target.classList.contains("tag")) target = target.parentElement!;
 454       if (!target.classList.contains("task")) return null;
 455       return target as HTMLElement;
 456     },
 457
 458     firstVisibleTask: function (root: Element | null = null) {
 459       if (root === null) root = document.body;
 460       for (const task of root.getElementsByClassName("task")) {
 461         const state = task.getAttribute("data-state");
 462         if (
 463           task instanceof HTMLElement &&
 464           (state === currentViewState || (currentViewState === "all" && state !== "deleted")) &&
 465           !task.classList.contains("hide")
 466         ) {
 467           return task;
 468         }
 469       }
 470     },
 471
 472     focusTaskNameInput: function (event: Event) {
 473       taskFocusedBeforeJumpingToInput = this.currentTask();
 474       document.getElementById("taskName")!.focus();
 475       window.scroll(0, 0);
 476       event.preventDefault();
 477     },
 478
 479     visibleTaskAtOffset(task: Element, offset: number): Element {
 480       var cursor: Element | null = task;
 481       var valid_cursor = cursor;
 482       const increment = offset / Math.abs(offset);
 483       while (true) {
 484         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 485         if (!cursor || !(cursor instanceof HTMLElement)) break;
 486         const state = cursor.getAttribute("data-state")!;
 487         if (
 488           (state === currentViewState || (currentViewState === "all" && state !== "deleted")) &&
 489           !cursor.classList.contains("hide")
 490         ) {
 491           offset -= increment;
 492           valid_cursor = cursor;
 493         }
 494         if (Math.abs(offset) < 0.5) break;
 495       }
 496       return valid_cursor;
 497     },
 498
 499     jumpCursor: function (position: number) {
 500       const first = this.firstVisibleTask();
 501       if (!first) return;
 502       const dest = this.visibleTaskAtOffset(first, position - 1);
 503       if (dest instanceof HTMLElement) dest.focus();
 504     },
 505
 506     makeBottomPriority: function (task: Element | null = null) {
 507       if (!task) task = this.currentTask();
 508       if (!task) return;
 509       this.setPriority(task, document.getElementById("tasks")!.lastElementChild, null);
 510     },
 511
 512     makeTopPriority: function (task: Element | null = null) {
 513       if (!task) task = this.currentTask();
 514       if (!task) return;
 515       ui.setPriority(task.getAttribute("id")!, clock.now(), model.getPriority(task));
 516       task instanceof HTMLElement && task.focus();
 517     },
 518
 519     moveCursorLeft: function () {
 520       const active = this.currentTask();
 521       if (!active) return false;
 522       if (active.parentElement!.classList.contains("task")) {
 523         active.parentElement!.focus();
 524       }
 525     },
 526
 527     moveCursorRight: function () {
 528       const active = this.currentTask();
 529       if (!active) return false;
 530       (this.firstVisibleTask(active) as HTMLElement | null)?.focus();
 531     },
 532
 533     moveCursorVertically: function (offset: number): boolean {
 534       let active = this.currentTask();
 535       if (!active) {
 536         this.firstVisibleTask()?.focus();
 537         active = this.currentTask();
 538       }
 539       if (!active) return false;
 540       const dest = this.visibleTaskAtOffset(active, offset);
 541       if (dest !== active && dest instanceof HTMLElement) {
 542         dest.focus();
 543         return true;
 544       }
 545       return false;
 546     },
 547
 548     moveTask: function (offset: number) {
 549       const active = this.currentTask();
 550       if (!active) return;
 551       const dest = this.visibleTaskAtOffset(active, offset);
 552       if (dest === active) return; // Already extremal
 553       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 554       if (onePastDest == dest) onePastDest = null; // Will become extremal
 555       if (offset > 0) {
 556         this.setPriority(active, dest, onePastDest);
 557       } else {
 558         this.setPriority(active, onePastDest, dest);
 559       }
 560     },
 561
 562     removeTag: function () {
 563       const target = this.currentTag();
 564       if (!target) return;
 565       ui.removeTag(target.parentElement!.getAttribute("id")!, target.textContent!);
 566     },
 567
 568     resetTagView: function () {
 569       currentTagFilter = null;
 570       this.setTitle();
 571       const taskList = document.getElementById("tasks")!;
 572       for (const task of Array.from(document.getElementsByClassName("task"))) {
 573         task.classList.remove("hide");
 574         if (task.parentElement !== taskList) {
 575           model.insertInPriorityOrder(task, taskList);
 576         }
 577       }
 578     },
 579
 580     resetView: function () {
 581       this.setView("todo");
 582       this.resetTagView();
 583     },
 584
 585     returnFocusAfterInput: function (): boolean {
 586       if (taskFocusedBeforeJumpingToInput) {
 587         taskFocusedBeforeJumpingToInput.focus();
 588         return true;
 589       }
 590       return false;
 591     },
 592
 593     // Change task's priority to be between other tasks a and b.
 594     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 595       const aPriority = a === null ? clock.now() : model.getPriority(a);
 596       const bPriority = b === null ? 0 : model.getPriority(b);
 597       console.assert(aPriority > bPriority, aPriority, ">", bPriority);
 598       const span = aPriority - bPriority;
 599       const newPriority = bPriority + 0.1 * span + 0.8 * span * Math.random();
 600       console.assert(aPriority > newPriority && newPriority > bPriority, aPriority, ">", newPriority, ">", bPriority);
 601       const newPriorityRounded = Math.round(newPriority);
 602       const okToRound = aPriority > newPriorityRounded && newPriorityRounded > bPriority;
 603       ui.setPriority(task.getAttribute("id")!, okToRound ? newPriorityRounded : newPriority, model.getPriority(task));
 604       task instanceof HTMLElement && task.focus();
 605     },
 606
 607     setState: function (newState: string) {
 608       const task = this.currentTask();
 609       if (!task) return;
 610       const oldState = task.getAttribute("data-state")!;
 611       if (newState === oldState) return;
 612       const createTimestamp = task.getAttribute("id")!;
 613       if (currentViewState !== "all" || newState == "deleted") {
 614         this.moveCursorVertically(1) || this.moveCursorVertically(-1);
 615       }
 616       return ui.setState(createTimestamp, newState, oldState);
 617     },
 618
 619     setTagFilter: function (filter: TagFilter) {
 620       if (currentTagFilter !== null) {
 621         this.resetTagView();
 622       }
 623
 624       const tasksWithTag = new Map();
 625       for (const task of document.getElementsByClassName("task")) {
 626         if (filter.include(task)) {
 627           tasksWithTag.set(task.getElementsByClassName("desc")[0].textContent, [model.getPriority(task), task]);
 628         }
 629       }
 630
 631       function highestPrioritySuperTask(t: Element) {
 632         var maxPriority = -1;
 633         var superTask = null;
 634         for (const child of t.getElementsByClassName("tag")) {
 635           const e = tasksWithTag.get(child.textContent);
 636           if (e !== undefined && e[0] > maxPriority) {
 637             maxPriority = e[0];
 638             superTask = e[1];
 639           }
 640         }
 641         return superTask;
 642       }
 643
 644       for (const task of Array.from(document.getElementsByClassName("task"))) {
 645         if (filter.include(task)) {
 646           task.classList.remove("hide");
 647         } else {
 648           const superTask = highestPrioritySuperTask(task);
 649           if (superTask !== null) {
 650             model.insertInPriorityOrder(task, superTask);
 651           } else {
 652             task.classList.add("hide");
 653           }
 654         }
 655       }
 656
 657       currentTagFilter = filter;
 658       this.setTitle();
 659     },
 660
 661     setTagView: function (tag: string | null = null) {
 662       if (tag === null) {
 663         const target = this.currentTag();
 664         if (!target) return;
 665         tag = target.textContent!;
 666       }
 667       this.setTagFilter({description: tag, include: task => !!model.hasTag(task, tag!)});
 668     },
 669
 670     setTitle: function () {
 671       document.title = "Vopamoi: " + currentViewState + (currentTagFilter ? ": " + currentTagFilter.description : "");
 672     },
 673
 674     setView: function (state: string) {
 675       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 676       if (state === "all") {
 677         sheet.insertRule(`.task[data-state=deleted] { display: none }`);
 678       } else {
 679         sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 680       }
 681       sheet.insertRule(`:root { --view-state-indicator-color: ${viewColors[state]}; }`);
 682       sheet.removeRule(2);
 683       sheet.removeRule(2);
 684       currentViewState = state;
 685       this.setTitle();
 686       if (this.currentTask()?.getAttribute("data-state") !== state) {
 687         this.firstVisibleTask()?.focus();
 688       }
 689     },
 690
 691     setUntaggedView: function () {
 692       this.setTagFilter({description: "(untagged)", include: task => task.getElementsByClassName("tag").length === 0});
 693     },
 694
 695     toggleDark: function () {
 696       document.body.classList.toggle("dark");
 697       this.setView(currentViewState);
 698     },
 699
 700     undo: function () {
 701       const ret = ui.undo();
 702       if (ret && ret instanceof HTMLElement) ret.focus();
 703     },
 704     redo: function () {
 705       const ret = ui.redo();
 706       if (ret && ret instanceof HTMLElement) ret.focus();
 707     },
 708   };
 709 }
 710 const browserUI = BrowserUI();
 711
 712 const scrollIncrement = 60;
 713 enum InputState {
 714   Root,
 715   S,
 716   V,
 717   VS,
 718 }
 719 var inputState = InputState.Root;
 720 var inputCount: number | null = null;
 721
 722 function handleKey(event: any) {
 723   if (["Alt", "Control", "Meta", "Shift"].includes(event.key)) return;
 724   if (event.target.tagName === "TEXTAREA") {
 725     if (event.key == "Enter" && event.ctrlKey) return browserUI.completeContentEdit(event);
 726     if (event.key == "Escape") return browserUI.completeContentEdit(event, CommitOrAbort.Abort);
 727   } else if (event.target.tagName === "INPUT") {
 728     if (event.target.id === "taskName") {
 729       if (event.key == "Enter") return browserUI.addTask(event);
 730       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 731     } else if (event.target.classList.contains("tag")) {
 732       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 733       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 734     } else {
 735       if (event.key == "Enter") return browserUI.completeEdit(event);
 736       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 737     }
 738   } else {
 739     if (inputState === InputState.Root) {
 740       if ("0" <= event.key && event.key <= "9") {
 741         return (inputCount = (inputCount ?? 0) * 10 + parseInt(event.key));
 742       }
 743       try {
 744         if (event.ctrlKey) {
 745           if (event.key == "e") return window.scrollBy(0, (inputCount ?? 1) * scrollIncrement);
 746           if (event.key == "y") return window.scrollBy(0, (inputCount ?? 1) * -scrollIncrement);
 747         } else {
 748           if (event.key == "h") return browserUI.moveCursorLeft();
 749           if (event.key == "l") return browserUI.moveCursorRight();
 750           if (event.key == "j") return browserUI.moveCursorVertically(inputCount ?? 1);
 751           if (event.key == "k") return browserUI.moveCursorVertically(-(inputCount ?? 1));
 752           if (event.key == "J") return browserUI.moveTask(inputCount ?? 1);
 753           if (event.key == "K") return browserUI.moveTask(-(inputCount ?? 1));
 754           if (event.key == "G") return browserUI.jumpCursor(inputCount ?? MAX_SAFE_INTEGER);
 755           if (event.key == "T") return browserUI.makeTopPriority();
 756           if (event.key == "n") return browserUI.focusTaskNameInput(event);
 757           if (event.key == "C") return browserUI.setState("cancelled");
 758           if (event.key == "d") return browserUI.setState("done");
 759           if (event.key == "q") return browserUI.setState("todo");
 760           if (event.key == "s") return (inputState = InputState.S);
 761           if (event.key == "w") return browserUI.setState("waiting");
 762           if (event.key == "X") return browserUI.setState("deleted");
 763           if (event.key == "x") return browserUI.removeTag();
 764           if (event.key == "u") return browserUI.undo();
 765           if (event.key == "r") return browserUI.redo();
 766           if (event.key == "E") return browserUI.beginEditContent(event);
 767           if (event.key == "e") return browserUI.beginEdit(event);
 768           if (event.key == "t") return browserUI.beginTagEdit(event);
 769           if (event.key == "v") return (inputState = InputState.V);
 770         }
 771       } finally {
 772         inputCount = null;
 773       }
 774     } else if (inputState === InputState.S) {
 775       inputState = InputState.Root;
 776       if (event.key == "m") return browserUI.setState("someday-maybe");
 777     } else if (inputState === InputState.V) {
 778       inputState = InputState.Root;
 779       if (event.key == "a") return browserUI.setView("all");
 780       if (event.key == "C") return browserUI.setView("cancelled");
 781       if (event.key == "c") return browserUI.setTagView("comp");
 782       if (event.key == "D") return browserUI.toggleDark();
 783       if (event.key == "d") return browserUI.setView("done");
 784       if (event.key == "e") return browserUI.setTagView("errand");
 785       if (event.key == "h") return browserUI.setTagView("home");
 786       if (event.key == "i") return browserUI.setUntaggedView();
 787       if (event.key == "p") return browserUI.setTagView("Project");
 788       if (event.key == "q") return browserUI.setView("todo");
 789       if (event.key == "s") return (inputState = InputState.VS);
 790       if (event.key == "T") return browserUI.resetTagView();
 791       if (event.key == "t") return browserUI.setTagView();
 792       if (event.key == "u") return browserUI.setUntaggedView();
 793       if (event.key == "v") return browserUI.resetView();
 794       if (event.key == "w") return browserUI.setView("waiting");
 795       if (event.key == "x") return browserUI.setView("deleted");
 796       if (event.key == "z") return browserUI.setTagView("zombie");
 797     } else if (inputState === InputState.VS) {
 798       inputState = InputState.Root;
 799       if (event.key == "m") return browserUI.setView("someday-maybe");
 800     }
 801   }
 802 }
 803
 804 function browserInit() {
 805   log.replay();
 806   browserUI.setTitle();
 807   browserUI.firstVisibleTask()?.focus();
 808   document.body.addEventListener("keydown", handleKey, { capture: false });
 809 }