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()} ${entry[1]}`);
 302       }
 303     },
 304   };
 305 }
 306 const ui = UI();
 307
 308 enum CommitOrAbort {
 309   Commit,
 310   Abort,
 311 }
 312
 313 function BrowserUI() {
 314   const viewColors: { [key: string]: string } = {
 315     all: "Gold",
 316     cancelled: "Red",
 317     deleted: "Black",
 318     done: "LawnGreen",
 319     "someday-maybe": "DeepSkyBlue",
 320     todo: "White",
 321     waiting: "MediumOrchid",
 322   };
 323   var currentTagFilter: string | null = null;
 324   var currentViewState = "todo";
 325   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 326   var lastTagNameEntered = "";
 327   return {
 328     addTask: function (event: KeyboardEvent) {
 329       const input = <HTMLInputElement>document.getElementById("taskName");
 330       if (input.value.match(/^ *$/)) return;
 331       const task = ui.addTask(input.value);
 332       if (currentViewState === "todo" || currentViewState === "all") {
 333         task instanceof HTMLElement && task.focus();
 334       } else if (this.returnFocusAfterInput()) {
 335       } else {
 336         this.firstVisibleTask()?.focus();
 337       }
 338       input.value = "";
 339       if (event.getModifierState("Control")) {
 340         this.makeBottomPriority(task);
 341       }
 342     },
 343
 344     beginEdit: function (event: Event) {
 345       const task = this.currentTask();
 346       if (!task) return;
 347       const input = document.createElement("input");
 348       const desc = task.getElementsByClassName("desc")[0];
 349       const oldDescription = desc.textContent!;
 350       task.setAttribute("data-description", oldDescription);
 351       input.value = oldDescription;
 352       input.addEventListener("blur", this.completeEdit, { once: true });
 353       desc.textContent = "";
 354       task.insertBefore(input, task.firstChild);
 355       input.focus();
 356       event.preventDefault();
 357     },
 358
 359     beginEditContent: function (event: Event) {
 360       const task = this.currentTask();
 361       if (!task) return;
 362       const input = document.createElement("textarea");
 363       const content = task.getElementsByClassName("content")[0];
 364       const oldContent = content?.textContent ?? "";
 365       task.setAttribute("data-content", oldContent);
 366       input.value = oldContent;
 367       input.addEventListener("blur", this.completeContentEdit, { once: true });
 368       if (content) content.textContent = "";
 369       task.appendChild(input);
 370       input.focus();
 371       event.preventDefault();
 372     },
 373
 374     beginTagEdit: function (event: Event) {
 375       const task = this.currentTask();
 376       if (!task) return;
 377       const input = document.createElement("input");
 378       input.classList.add("tag");
 379       input.addEventListener("blur", this.completeTagEdit, { once: true });
 380       input.value = lastTagNameEntered;
 381       task.appendChild(input);
 382       input.focus();
 383       input.select();
 384       event.preventDefault();
 385     },
 386
 387     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 388       const input = event.target as HTMLInputElement;
 389       const task = input.parentElement!;
 390       const desc = task.getElementsByClassName("desc")[0];
 391       const oldDescription = task.getAttribute("data-description")!;
 392       const newDescription = input.value;
 393       input.removeEventListener("blur", this.completeEdit);
 394       task.removeChild(input);
 395       task.removeAttribute("data-description");
 396       task.focus();
 397       if (resolution === CommitOrAbort.Abort || newDescription.match(/^ *$/) || newDescription === oldDescription) {
 398         desc.textContent = oldDescription;
 399       } else {
 400         ui.edit(task.getAttribute("id")!, newDescription, oldDescription);
 401       }
 402     },
 403
 404     completeContentEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 405       const input = event.target as HTMLInputElement;
 406       const task = input.parentElement!;
 407       const content = task.getElementsByClassName("content")[0];
 408       const oldContent = task.getAttribute("data-content")!;
 409       const newContent = input.value;
 410       input.removeEventListener("blur", this.completeContentEdit);
 411       task.removeChild(input);
 412       task.removeAttribute("data-content");
 413       task.focus();
 414       if (resolution === CommitOrAbort.Abort || newContent === oldContent) {
 415         if (content) content.textContent = oldContent;
 416       } else {
 417         ui.editContent(task.getAttribute("id")!, newContent, oldContent);
 418       }
 419     },
 420
 421     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 422       const input = event.target as HTMLInputElement;
 423       const task = input.parentElement!;
 424       const newTagName = input.value;
 425       input.removeEventListener("blur", this.completeTagEdit);
 426       task.removeChild(input);
 427       task.focus();
 428       if (resolution === CommitOrAbort.Commit && !newTagName.match(/^ *$/) && !model.hasTag(task, newTagName)) {
 429         ui.addTag(task.getAttribute("id")!, newTagName);
 430         lastTagNameEntered = newTagName;
 431       }
 432     },
 433
 434     currentTag: function (): Element | null {
 435       var target = document.activeElement;
 436       if (!target) return null;
 437       if (target.classList.contains("task")) {
 438         const tags = target.getElementsByClassName("tag");
 439         target = tags[tags.length - 1];
 440       }
 441       if (!target || !target.classList.contains("tag")) return null;
 442       return target;
 443     },
 444
 445     currentTask: function (): HTMLElement | null {
 446       var target = document.activeElement;
 447       if (!target) return null;
 448       if (target.classList.contains("tag")) target = target.parentElement!;
 449       if (!target.classList.contains("task")) return null;
 450       return target as HTMLElement;
 451     },
 452
 453     firstVisibleTask: function (root: Element | null = null) {
 454       if (root === null) root = document.body;
 455       for (const task of root.getElementsByClassName("task")) {
 456         const state = task.getAttribute("data-state");
 457         if (
 458           task instanceof HTMLElement &&
 459           (state === currentViewState || (currentViewState === "all" && state !== "deleted")) &&
 460           !task.classList.contains("hide")
 461         ) {
 462           return task;
 463         }
 464       }
 465     },
 466
 467     focusTaskNameInput: function (event: Event) {
 468       taskFocusedBeforeJumpingToInput = this.currentTask();
 469       document.getElementById("taskName")!.focus();
 470       window.scroll(0, 0);
 471       event.preventDefault();
 472     },
 473
 474     visibleTaskAtOffset(task: Element, offset: number): Element {
 475       var cursor: Element | null = task;
 476       var valid_cursor = cursor;
 477       const increment = offset / Math.abs(offset);
 478       while (true) {
 479         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 480         if (!cursor || !(cursor instanceof HTMLElement)) break;
 481         const state = cursor.getAttribute("data-state")!;
 482         if (
 483           (state === currentViewState || (currentViewState === "all" && state !== "deleted")) &&
 484           !cursor.classList.contains("hide")
 485         ) {
 486           offset -= increment;
 487           valid_cursor = cursor;
 488         }
 489         if (Math.abs(offset) < 0.5) break;
 490       }
 491       return valid_cursor;
 492     },
 493
 494     jumpCursor: function (position: number) {
 495       const first = this.firstVisibleTask();
 496       if (!first) return;
 497       const dest = this.visibleTaskAtOffset(first, position - 1);
 498       if (dest instanceof HTMLElement) dest.focus();
 499     },
 500
 501     makeBottomPriority: function (task: Element | null = null) {
 502       if (!task) task = this.currentTask();
 503       if (!task) return;
 504       this.setPriority(task, document.getElementById("tasks")!.lastElementChild, null);
 505     },
 506
 507     makeTopPriority: function (task: Element | null = null) {
 508       if (!task) task = this.currentTask();
 509       if (!task) return;
 510       ui.setPriority(task.getAttribute("id")!, clock.now(), model.getPriority(task));
 511       task instanceof HTMLElement && task.focus();
 512     },
 513
 514     moveCursorLeft: function () {
 515       const active = this.currentTask();
 516       if (!active) return false;
 517       if (active.parentElement!.classList.contains("task")) {
 518         active.parentElement!.focus();
 519       }
 520     },
 521
 522     moveCursorRight: function () {
 523       const active = this.currentTask();
 524       if (!active) return false;
 525       (this.firstVisibleTask(active) as HTMLElement | null)?.focus();
 526     },
 527
 528     moveCursorVertically: function (offset: number): boolean {
 529       let active = this.currentTask();
 530       if (!active) {
 531         this.firstVisibleTask()?.focus();
 532         active = this.currentTask();
 533       }
 534       if (!active) return false;
 535       const dest = this.visibleTaskAtOffset(active, offset);
 536       if (dest !== active && dest instanceof HTMLElement) {
 537         dest.focus();
 538         return true;
 539       }
 540       return false;
 541     },
 542
 543     moveTask: function (offset: number) {
 544       const active = this.currentTask();
 545       if (!active) return;
 546       const dest = this.visibleTaskAtOffset(active, offset);
 547       if (dest === active) return; // Already extremal
 548       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 549       if (onePastDest == dest) onePastDest = null; // Will become extremal
 550       if (offset > 0) {
 551         this.setPriority(active, dest, onePastDest);
 552       } else {
 553         this.setPriority(active, onePastDest, dest);
 554       }
 555     },
 556
 557     removeTag: function () {
 558       const target = this.currentTag();
 559       if (!target) return;
 560       ui.removeTag(target.parentElement!.getAttribute("id")!, target.textContent!);
 561     },
 562
 563     resetTagView: function () {
 564       currentTagFilter = null;
 565       this.setTitle();
 566       const taskList = document.getElementById("tasks")!;
 567       for (const task of Array.from(document.getElementsByClassName("task"))) {
 568         task.classList.remove("hide");
 569         if (task.parentElement !== taskList) {
 570           model.insertInPriorityOrder(task, taskList);
 571         }
 572       }
 573     },
 574
 575     resetView: function () {
 576       this.setView("todo");
 577       this.resetTagView();
 578     },
 579
 580     returnFocusAfterInput: function (): boolean {
 581       if (taskFocusedBeforeJumpingToInput) {
 582         taskFocusedBeforeJumpingToInput.focus();
 583         return true;
 584       }
 585       return false;
 586     },
 587
 588     // Change task's priority to be between other tasks a and b.
 589     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 590       const aPriority = a === null ? clock.now() : model.getPriority(a);
 591       const bPriority = b === null ? 0 : model.getPriority(b);
 592       console.assert(aPriority > bPriority, aPriority, ">", bPriority);
 593       const span = aPriority - bPriority;
 594       const newPriority = bPriority + 0.1 * span + 0.8 * span * Math.random();
 595       console.assert(aPriority > newPriority && newPriority > bPriority, aPriority, ">", newPriority, ">", bPriority);
 596       const newPriorityRounded = Math.round(newPriority);
 597       const okToRound = aPriority > newPriorityRounded && newPriorityRounded > bPriority;
 598       ui.setPriority(task.getAttribute("id")!, okToRound ? newPriorityRounded : newPriority, model.getPriority(task));
 599       task instanceof HTMLElement && task.focus();
 600     },
 601
 602     setState: function (newState: string) {
 603       const task = this.currentTask();
 604       if (!task) return;
 605       const oldState = task.getAttribute("data-state")!;
 606       if (newState === oldState) return;
 607       const createTimestamp = task.getAttribute("id")!;
 608       if (currentViewState !== "all" || newState == "deleted") {
 609         this.moveCursorVertically(1) || this.moveCursorVertically(-1);
 610       }
 611       return ui.setState(createTimestamp, newState, oldState);
 612     },
 613
 614     setTagFilter: function (tag: string) {
 615       if (currentTagFilter !== null) {
 616         this.resetTagView();
 617       }
 618
 619       const tasksWithTag = new Map();
 620       for (const task of document.getElementsByClassName("task")) {
 621         if (model.hasTag(task, tag)) {
 622           tasksWithTag.set(task.getElementsByClassName("desc")[0].textContent, [model.getPriority(task), task]);
 623         }
 624       }
 625
 626       function highestPrioritySuperTask(t: Element) {
 627         var maxPriority = -1;
 628         var superTask = null;
 629         for (const child of t.getElementsByClassName("tag")) {
 630           const e = tasksWithTag.get(child.textContent);
 631           if (e !== undefined && e[0] > maxPriority) {
 632             maxPriority = e[0];
 633             superTask = e[1];
 634           }
 635         }
 636         return superTask;
 637       }
 638
 639       for (const task of Array.from(document.getElementsByClassName("task"))) {
 640         if (model.hasTag(task, tag)) {
 641           task.classList.remove("hide");
 642         } else {
 643           const superTask = highestPrioritySuperTask(task);
 644           if (superTask !== null) {
 645             model.insertInPriorityOrder(task, superTask);
 646           } else {
 647             task.classList.add("hide");
 648           }
 649         }
 650       }
 651
 652       currentTagFilter = tag;
 653       this.setTitle();
 654     },
 655
 656     setTagView: function (tag: string | null = null) {
 657       if (tag === null) {
 658         const target = this.currentTag();
 659         if (!target) return;
 660         tag = target.textContent!;
 661       }
 662       this.setTagFilter(tag);
 663     },
 664
 665     setTitle: function () {
 666       document.title = "Vopamoi: " + currentViewState + (currentTagFilter ? ": " + currentTagFilter : "");
 667     },
 668
 669     setView: function (state: string) {
 670       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 671       if (state === "all") {
 672         sheet.insertRule(`.task[data-state=deleted] { display: none }`);
 673       } else {
 674         sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 675       }
 676       sheet.insertRule(`:root { --view-state-indicator-color: ${viewColors[state]}; }`);
 677       sheet.removeRule(2);
 678       sheet.removeRule(2);
 679       currentViewState = state;
 680       this.setTitle();
 681       if (this.currentTask()?.getAttribute("data-state") !== state) {
 682         this.firstVisibleTask()?.focus();
 683       }
 684     },
 685
 686     setUntaggedView: function () {
 687       if (currentTagFilter !== null) {
 688         this.resetTagView();
 689       }
 690       for (const task of document.getElementsByClassName("task")) {
 691         if (task.getElementsByClassName("tag").length === 0) {
 692           task.classList.remove("hide");
 693         } else {
 694           task.classList.add("hide");
 695         }
 696       }
 697     },
 698
 699     undo: function () {
 700       const ret = ui.undo();
 701       if (ret && ret instanceof HTMLElement) ret.focus();
 702     },
 703     redo: function () {
 704       const ret = ui.redo();
 705       if (ret && ret instanceof HTMLElement) ret.focus();
 706     },
 707   };
 708 }
 709 const browserUI = BrowserUI();
 710
 711 const scrollIncrement = 60;
 712 enum InputState {
 713   Root,
 714   S,
 715   V,
 716   VS,
 717 }
 718 var inputState = InputState.Root;
 719 var inputCount: number | null = null;
 720
 721 function handleKey(event: any) {
 722   if (["Alt", "Control", "Meta", "Shift"].includes(event.key)) return;
 723   if (event.target.tagName === "TEXTAREA") {
 724     if (event.key == "Enter" && event.ctrlKey) return browserUI.completeContentEdit(event);
 725     if (event.key == "Escape") return browserUI.completeContentEdit(event, CommitOrAbort.Abort);
 726   } else if (event.target.tagName === "INPUT") {
 727     if (event.target.id === "taskName") {
 728       if (event.key == "Enter") return browserUI.addTask(event);
 729       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 730     } else if (event.target.classList.contains("tag")) {
 731       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 732       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 733     } else {
 734       if (event.key == "Enter") return browserUI.completeEdit(event);
 735       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 736     }
 737   } else {
 738     if (inputState === InputState.Root) {
 739       if ("0" <= event.key && event.key <= "9") {
 740         return (inputCount = (inputCount ?? 0) * 10 + parseInt(event.key));
 741       }
 742       try {
 743         if (event.ctrlKey) {
 744           if (event.key == "e") return window.scrollBy(0, (inputCount ?? 1) * scrollIncrement);
 745           if (event.key == "y") return window.scrollBy(0, (inputCount ?? 1) * -scrollIncrement);
 746         } else {
 747           if (event.key == "h") return browserUI.moveCursorLeft();
 748           if (event.key == "l") return browserUI.moveCursorRight();
 749           if (event.key == "j") return browserUI.moveCursorVertically(inputCount ?? 1);
 750           if (event.key == "k") return browserUI.moveCursorVertically(-(inputCount ?? 1));
 751           if (event.key == "J") return browserUI.moveTask(inputCount ?? 1);
 752           if (event.key == "K") return browserUI.moveTask(-(inputCount ?? 1));
 753           if (event.key == "G") return browserUI.jumpCursor(inputCount ?? MAX_SAFE_INTEGER);
 754           if (event.key == "T") return browserUI.makeTopPriority();
 755           if (event.key == "n") return browserUI.focusTaskNameInput(event);
 756           if (event.key == "c") return browserUI.setState("cancelled");
 757           if (event.key == "d") return browserUI.setState("done");
 758           if (event.key == "q") return browserUI.setState("todo");
 759           if (event.key == "s") return (inputState = InputState.S);
 760           if (event.key == "w") return browserUI.setState("waiting");
 761           if (event.key == "X") return browserUI.setState("deleted");
 762           if (event.key == "x") return browserUI.removeTag();
 763           if (event.key == "u") return browserUI.undo();
 764           if (event.key == "r") return browserUI.redo();
 765           if (event.key == "E") return browserUI.beginEditContent(event);
 766           if (event.key == "e") return browserUI.beginEdit(event);
 767           if (event.key == "t") return browserUI.beginTagEdit(event);
 768           if (event.key == "v") return (inputState = InputState.V);
 769         }
 770       } finally {
 771         inputCount = null;
 772       }
 773     } else if (inputState === InputState.S) {
 774       inputState = InputState.Root;
 775       if (event.key == "m") return browserUI.setState("someday-maybe");
 776     } else if (inputState === InputState.V) {
 777       inputState = InputState.Root;
 778       if (event.key == "a") return browserUI.setView("all");
 779       if (event.key == "c") return browserUI.setView("cancelled");
 780       if (event.key == "d") return browserUI.setView("done");
 781       if (event.key == "i") return browserUI.setUntaggedView();
 782       if (event.key == "p") return browserUI.setTagView("Project");
 783       if (event.key == "q") return browserUI.setView("todo");
 784       if (event.key == "s") return (inputState = InputState.VS);
 785       if (event.key == "T") return browserUI.resetTagView();
 786       if (event.key == "t") return browserUI.setTagView();
 787       if (event.key == "u") return browserUI.setUntaggedView();
 788       if (event.key == "v") return browserUI.resetView();
 789       if (event.key == "w") return browserUI.setView("waiting");
 790       if (event.key == "x") return browserUI.setView("deleted");
 791     } else if (inputState === InputState.VS) {
 792       inputState = InputState.Root;
 793       if (event.key == "m") return browserUI.setView("someday-maybe");
 794     }
 795   }
 796 }
 797
 798 function browserInit() {
 799   log.replay();
 800   browserUI.setTitle();
 801   browserUI.firstVisibleTask()?.focus();
 802   document.body.addEventListener("keydown", handleKey, { capture: false });
 803 }