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 const Model = {
  39   addTask: function (timestamp: string, description: string): Element {
  40     const task = document.createElement("div");
  41     const desc = document.createElement("span");
  42     desc.textContent = description;
  43     desc.classList.add("desc");
  44     task.appendChild(desc);
  45     task.classList.add("task");
  46     task.setAttribute("tabindex", "0");
  47     task.setAttribute("data-created", timestamp);
  48     task.setAttribute("data-state", "todo");
  49     document.getElementById("tasks")!.appendChild(task);
  50     return task;
  51   },
  52
  53   addTag: function (createTimestamp: string, tagName: string): Element | null {
  54     const task = this.getTask(createTimestamp);
  55     if (!task) return null;
  56     const existingTag = this.hasTag(task, tagName);
  57     if (existingTag) return existingTag;
  58     const tag = document.createElement("span");
  59     tag.appendChild(document.createTextNode(tagName));
  60     tag.classList.add("tag");
  61     tag.setAttribute("tabindex", "0");
  62     hashHue(tagName).then((hue) => (tag.style.backgroundColor = `hsl(${hue},90%,45%)`));
  63     for (const child of task.getElementsByClassName("tag")) {
  64       if (tagName > child.textContent!) {
  65         task.insertBefore(tag, child);
  66         return tag;
  67       }
  68     }
  69     task.appendChild(tag);
  70     return tag;
  71   },
  72
  73   edit: function (createTimestamp: string, newDescription: string): Element | null {
  74     const target = this.getTask(createTimestamp);
  75     if (!target) return null;
  76     if (target.hasAttribute("data-description")) {
  77       // Oh no: An edit has arrived from a replica while a local edit is in progress.
  78       const input = target.firstChild as HTMLInputElement;
  79       if (
  80         input.value === target.getAttribute("data-description") &&
  81         input.selectionStart === input.value.length &&
  82         input.selectionEnd === input.value.length
  83       ) {
  84         // No local changes have actually been made yet.  Change the contents of the edit box!
  85         input.value = newDescription;
  86       } else {
  87         // No great options.
  88         // Prefer not to interrupt the local user's edit.
  89         // The remote edit is mostly lost; this mostly becomes last-write-wins.
  90         target.setAttribute("data-description", newDescription);
  91       }
  92     } else {
  93       target.getElementsByClassName("desc")[0].textContent = newDescription;
  94     }
  95     return target;
  96   },
  97
  98   hasTag: function (task: Element, tag: string): Element | null {
  99     for (const child of task.getElementsByClassName("tag")) {
 100       if (child.textContent === tag) {
 101         return child;
 102       }
 103     }
 104     return null;
 105   },
 106
 107   getPriority: function (task: Element): number {
 108     if (task.hasAttribute("data-priority")) {
 109       return parseFloat(task.getAttribute("data-priority")!);
 110     }
 111     return parseFloat(task.getAttribute("data-created")!);
 112   },
 113
 114   getTask: function (createTimestamp: string) {
 115     for (const task of document.getElementsByClassName("task")) {
 116       if (task.getAttribute("data-created") === createTimestamp) {
 117         return task;
 118       }
 119     }
 120   },
 121
 122   removeTag: function (createTimestamp: string, tagName: string) {
 123     const task = this.getTask(createTimestamp);
 124     if (!task) return null;
 125     const tag = this.hasTag(task, tagName);
 126     if (!tag) return;
 127     task.removeChild(tag);
 128     if (task instanceof HTMLElement) task.focus();
 129   },
 130
 131   setPriority: function (createTimestamp: string, priority: number): Element | null {
 132     const target = this.getTask(createTimestamp);
 133     if (!target) return null;
 134     target.setAttribute("data-priority", `${priority}`);
 135     for (const task of document.getElementsByClassName("task")) {
 136       if (task !== target && this.getPriority(task) > priority) {
 137         task.parentElement!.insertBefore(target, task);
 138         return target;
 139       }
 140     }
 141     document.getElementById("tasks")!.appendChild(target);
 142     return target;
 143   },
 144
 145   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 146     const task = this.getTask(createTimestamp);
 147     if (task) {
 148       task.setAttribute("data-state", state);
 149     }
 150   },
 151 };
 152
 153 function Log(prefix: string = "vp-") {
 154   var next_log_index = 0;
 155   return {
 156     apply: function (entry: string) {
 157       const [timestamp, command, data] = splitN(entry, " ", 2);
 158       if (command == "Create") {
 159         return Model.addTask(timestamp, data);
 160       }
 161       if (command == "Edit") {
 162         const [createTimestamp, description] = splitN(data, " ", 1);
 163         return Model.edit(createTimestamp, description);
 164       }
 165       if (command == "Priority") {
 166         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 167         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 168       }
 169       if (command == "State") {
 170         const [createTimestamp, state] = splitN(data, " ", 1);
 171         return Model.setState(timestamp, createTimestamp, state);
 172       }
 173       if (command == "Tag") {
 174         const [createTimestamp, tag] = splitN(data, " ", 1);
 175         return Model.addTag(createTimestamp, tag);
 176       }
 177       if (command == "Untag") {
 178         const [createTimestamp, tag] = splitN(data, " ", 1);
 179         return Model.removeTag(createTimestamp, tag);
 180       }
 181     },
 182
 183     record: function (entry: string) {
 184       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 185     },
 186
 187     recordAndApply: function (entry: string) {
 188       this.record(entry);
 189       return this.apply(entry);
 190     },
 191
 192     replay: function () {
 193       while (true) {
 194         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 195         if (entry === null) {
 196           break;
 197         }
 198         this.apply(entry);
 199         next_log_index++;
 200       }
 201     },
 202   };
 203 }
 204 const log = Log();
 205
 206 function UI() {
 207   const undoLog: string[] = [];
 208   return {
 209     addTask: function (description: string): Element {
 210       const now = clock.now();
 211       undoLog.push(`State ${now} deleted`);
 212       return <Element>log.recordAndApply(`${now} Create ${description}`);
 213     },
 214     addTag: function (createTimestamp: string, tag: string) {
 215       undoLog.push(`Untag ${createTimestamp} ${tag}`);
 216       return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
 217     },
 218     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 219       undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 220       return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 221     },
 222     removeTag: function (createTimestamp: string, tag: string) {
 223       undoLog.push(`Tag ${createTimestamp} ${tag}`);
 224       return log.recordAndApply(`${clock.now()} Untag ${createTimestamp} ${tag}`);
 225     },
 226     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 227       undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 228       return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 229     },
 230     setState: function (createTimestamp: string, newState: string, oldState: string) {
 231       undoLog.push(`State ${createTimestamp} ${oldState}`);
 232       return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 233     },
 234     undo: function () {
 235       if (undoLog.length > 0) {
 236         return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 237       }
 238     },
 239   };
 240 }
 241 const ui = UI();
 242
 243 enum CommitOrAbort {
 244   Commit,
 245   Abort,
 246 }
 247
 248 function BrowserUI() {
 249   var currentViewState = "todo";
 250   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 251   var lastTagNameEntered = "";
 252   return {
 253     addTask: function (event: KeyboardEvent) {
 254       const input = <HTMLInputElement>document.getElementById("taskName");
 255       if (input.value.match(/^ *$/)) return;
 256       const task = ui.addTask(input.value);
 257       if (currentViewState === "todo") {
 258         task instanceof HTMLElement && task.focus();
 259       } else if (this.returnFocusAfterInput()) {
 260       } else {
 261         this.firstVisibleTask()?.focus();
 262       }
 263       input.value = "";
 264       if (event.getModifierState("Control")) {
 265         this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 266       }
 267     },
 268
 269     beginEdit: function (event: Event) {
 270       const task = document.activeElement;
 271       if (!task) return;
 272       const input = document.createElement("input");
 273       const desc = task.getElementsByClassName("desc")[0];
 274       const oldDescription = desc.textContent!;
 275       task.setAttribute("data-description", oldDescription);
 276       input.value = oldDescription;
 277       input.addEventListener("blur", this.completeEdit, { once: true });
 278       desc.textContent = "";
 279       task.insertBefore(input, task.firstChild);
 280       input.focus();
 281       event.preventDefault();
 282     },
 283
 284     beginTagEdit: function (event: Event) {
 285       const task = document.activeElement;
 286       if (!task) return;
 287       const input = document.createElement("input");
 288       input.classList.add("tag");
 289       input.addEventListener("blur", this.completeTagEdit, { once: true });
 290       input.value = lastTagNameEntered;
 291       task.appendChild(input);
 292       input.focus();
 293       input.select();
 294       event.preventDefault();
 295     },
 296
 297     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 298       const input = event.target as HTMLInputElement;
 299       const task = input.parentElement!;
 300       const desc = task.getElementsByClassName("desc")[0];
 301       const oldDescription = task.getAttribute("data-description")!;
 302       const newDescription = input.value;
 303       input.removeEventListener("blur", this.completeEdit);
 304       task.removeChild(input);
 305       task.removeAttribute("data-description");
 306       task.focus();
 307       if (resolution === CommitOrAbort.Abort || newDescription.match(/^ *$/) || newDescription === oldDescription) {
 308         desc.textContent = oldDescription;
 309       } else {
 310         ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 311       }
 312     },
 313
 314     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 315       const input = event.target as HTMLInputElement;
 316       const task = input.parentElement!;
 317       const newTagName = input.value;
 318       input.removeEventListener("blur", this.completeTagEdit);
 319       task.removeChild(input);
 320       task.focus();
 321       if (resolution === CommitOrAbort.Commit && !newTagName.match(/^ *$/) && !Model.hasTag(task, newTagName)) {
 322         ui.addTag(task.getAttribute("data-created")!, newTagName);
 323         lastTagNameEntered = newTagName;
 324       }
 325     },
 326
 327     firstVisibleTask: function () {
 328       for (const task of document.getElementsByClassName("task")) {
 329         if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
 330           return task;
 331         }
 332       }
 333     },
 334
 335     focusTaskNameInput: function (event: Event) {
 336       if (document.activeElement instanceof HTMLElement) {
 337         taskFocusedBeforeJumpingToInput = document.activeElement;
 338       }
 339       document.getElementById("taskName")!.focus();
 340       event.preventDefault();
 341     },
 342
 343     visibleTaskAtOffset(task: Element, offset: number): Element {
 344       var cursor: Element | null = task;
 345       var valid_cursor = cursor;
 346       const increment = offset / Math.abs(offset);
 347       while (true) {
 348         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 349         if (!cursor || !(cursor instanceof HTMLElement)) break;
 350         if (cursor.getAttribute("data-state")! === currentViewState) {
 351           offset -= increment;
 352           valid_cursor = cursor;
 353         }
 354         if (Math.abs(offset) < 0.5) break;
 355       }
 356       return valid_cursor;
 357     },
 358
 359     moveCursor: function (offset: number): boolean {
 360       const active = document.activeElement;
 361       if (!active) return false;
 362       const dest = this.visibleTaskAtOffset(active, offset);
 363       if (dest !== active && dest instanceof HTMLElement) {
 364         dest.focus();
 365         return true;
 366       }
 367       return false;
 368     },
 369
 370     moveTask: function (offset: number) {
 371       const active = document.activeElement;
 372       if (!active) return;
 373       const dest = this.visibleTaskAtOffset(active, offset);
 374       if (dest === active) return; // Already extremal
 375       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 376       if (onePastDest == dest) onePastDest = null; // Will become extremal
 377       if (offset > 0) {
 378         this.setPriority(active, dest, onePastDest);
 379       } else {
 380         this.setPriority(active, onePastDest, dest);
 381       }
 382     },
 383
 384     removeTag: function () {
 385       const tag = document.activeElement;
 386       if (!tag || !tag.classList.contains("tag")) return;
 387       ui.removeTag(tag.parentElement!.getAttribute("data-created")!, tag.textContent!);
 388     },
 389
 390     returnFocusAfterInput: function (): boolean {
 391       if (taskFocusedBeforeJumpingToInput) {
 392         taskFocusedBeforeJumpingToInput.focus();
 393         return true;
 394       }
 395       return false;
 396     },
 397
 398     // Change task's priority to be between other tasks a and b.
 399     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 400       const aPriority = a === null ? 0 : Model.getPriority(a);
 401       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 402       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 403       const span = bPriority - aPriority;
 404       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 405       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 406       const newPriorityRounded = Math.round(newPriority);
 407       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 408       ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 409       task instanceof HTMLElement && task.focus();
 410     },
 411
 412     setState: function (newState: string) {
 413       const task = document.activeElement;
 414       if (!task) return;
 415       const oldState = task.getAttribute("data-state")!;
 416       if (newState === oldState) return;
 417       const createTimestamp = task.getAttribute("data-created")!;
 418       this.moveCursor(1) || this.moveCursor(-1);
 419       return ui.setState(createTimestamp, newState, oldState);
 420     },
 421
 422     setView: function (state: string, color: string) {
 423       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 424       sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 425       sheet.insertRule(`:root { --view-state-indicator-color: ${color}; }`);
 426       sheet.removeRule(2);
 427       sheet.removeRule(2);
 428       currentViewState = state;
 429       if (document.activeElement?.getAttribute("data-state") !== state) {
 430         this.firstVisibleTask()?.focus();
 431       }
 432     },
 433
 434     undo: function () {
 435       const ret = ui.undo();
 436       if (ret && ret instanceof HTMLElement) ret.focus();
 437     },
 438   };
 439 }
 440 const browserUI = BrowserUI();
 441
 442 enum InputState {
 443   Command,
 444   View,
 445 }
 446 var inputState = InputState.Command;
 447
 448 function handleKey(event: any) {
 449   if (event.target.tagName === "INPUT") {
 450     if (event.target.id === "taskName") {
 451       if (event.key == "Enter") return browserUI.addTask(event);
 452       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 453     } else if (event.target.classList.contains("tag")) {
 454       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 455       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 456     } else {
 457       if (event.key == "Enter") return browserUI.completeEdit(event);
 458       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 459     }
 460   } else {
 461     if (inputState === InputState.Command) {
 462       if (event.key == "j") return browserUI.moveCursor(1);
 463       if (event.key == "k") return browserUI.moveCursor(-1);
 464       if (event.key == "J") return browserUI.moveTask(1);
 465       if (event.key == "K") return browserUI.moveTask(-1);
 466       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 467       if (event.key == "c") return browserUI.setState("cancelled");
 468       if (event.key == "d") return browserUI.setState("done");
 469       if (event.key == "q") return browserUI.setState("todo");
 470       if (event.key == "s") return browserUI.setState("someday-maybe");
 471       if (event.key == "w") return browserUI.setState("waiting");
 472       if (event.key == "X") return browserUI.setState("deleted");
 473       if (event.key == "x") return browserUI.removeTag();
 474       if (event.key == "u") return browserUI.undo();
 475       if (event.key == "e") return browserUI.beginEdit(event);
 476       if (event.key == "t") return browserUI.beginTagEdit(event);
 477       if (event.key == "v") return (inputState = InputState.View);
 478     } else if (inputState === InputState.View) {
 479       inputState = InputState.Command;
 480       if (event.key == "c") return browserUI.setView("cancelled", "Red");
 481       if (event.key == "d") return browserUI.setView("done", "LawnGreen");
 482       if (event.key == "q") return browserUI.setView("todo", "White");
 483       if (event.key == "s") return browserUI.setView("someday-maybe", "DeepSkyBlue");
 484       if (event.key == "v") return browserUI.setView("todo", "White");
 485       if (event.key == "w") return browserUI.setView("waiting", "MediumOrchid");
 486       if (event.key == "x") return browserUI.setView("deleted", "Black");
 487     }
 488   }
 489 }
 490
 491 function browserInit() {
 492   log.replay();
 493   browserUI.firstVisibleTask()?.focus();
 494   document.body.addEventListener("keydown", handleKey, { capture: false });
 495 }