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   setPriority: function (createTimestamp: string, priority: number): Element | null {
 123     const target = this.getTask(createTimestamp);
 124     if (!target) return null;
 125     target.setAttribute("data-priority", `${priority}`);
 126     for (const task of document.getElementsByClassName("task")) {
 127       if (task !== target && this.getPriority(task) > priority) {
 128         task.parentElement!.insertBefore(target, task);
 129         return target;
 130       }
 131     }
 132     document.getElementById("tasks")!.appendChild(target);
 133     return target;
 134   },
 135
 136   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 137     const task = this.getTask(createTimestamp);
 138     if (task) {
 139       task.setAttribute("data-state", state);
 140     }
 141   },
 142 };
 143
 144 function Log(prefix: string = "vp-") {
 145   var next_log_index = 0;
 146   return {
 147     apply: function (entry: string) {
 148       const [timestamp, command, data] = splitN(entry, " ", 2);
 149       if (command == "Create") {
 150         return Model.addTask(timestamp, data);
 151       }
 152       if (command == "Edit") {
 153         const [createTimestamp, description] = splitN(data, " ", 1);
 154         return Model.edit(createTimestamp, description);
 155       }
 156       if (command == "Priority") {
 157         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 158         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 159       }
 160       if (command == "State") {
 161         const [createTimestamp, state] = splitN(data, " ", 1);
 162         return Model.setState(timestamp, createTimestamp, state);
 163       }
 164       if (command == "Tag") {
 165         const [createTimestamp, tag] = splitN(data, " ", 1);
 166         return Model.addTag(createTimestamp, tag);
 167       }
 168     },
 169
 170     record: function (entry: string) {
 171       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 172     },
 173
 174     recordAndApply: function (entry: string) {
 175       this.record(entry);
 176       return this.apply(entry);
 177     },
 178
 179     replay: function () {
 180       while (true) {
 181         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 182         if (entry === null) {
 183           break;
 184         }
 185         this.apply(entry);
 186         next_log_index++;
 187       }
 188     },
 189   };
 190 }
 191 const log = Log();
 192
 193 function UI() {
 194   const undoLog: string[] = [];
 195   return {
 196     addTask: function (description: string): Element {
 197       const now = clock.now();
 198       undoLog.push(`State ${now} deleted`);
 199       return <Element>log.recordAndApply(`${now} Create ${description}`);
 200     },
 201     addTag: function (createTimestamp: string, tag: string) {
 202       // TODO: undo
 203       return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
 204     },
 205     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 206       undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 207       return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 208     },
 209     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 210       undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 211       return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 212     },
 213     setState: function (createTimestamp: string, newState: string, oldState: string) {
 214       undoLog.push(`State ${createTimestamp} ${oldState}`);
 215       return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 216     },
 217     undo: function () {
 218       if (undoLog.length > 0) {
 219         return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 220       }
 221     },
 222   };
 223 }
 224 const ui = UI();
 225
 226 enum CommitOrAbort {
 227   Commit,
 228   Abort,
 229 }
 230
 231 function BrowserUI() {
 232   var currentViewState = "todo";
 233   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 234   var lastTagNameEntered = "";
 235   return {
 236     addTask: function (event: KeyboardEvent) {
 237       const input = <HTMLInputElement>document.getElementById("taskName");
 238       if (input.value) {
 239         const task = ui.addTask(input.value);
 240         if (currentViewState === "todo") {
 241           task instanceof HTMLElement && task.focus();
 242         } else if (this.returnFocusAfterInput()) {
 243         } else {
 244           this.firstVisibleTask()?.focus();
 245         }
 246         input.value = "";
 247         if (event.getModifierState("Control")) {
 248           this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 249         }
 250       }
 251     },
 252
 253     beginEdit: function (event: Event) {
 254       const task = document.activeElement;
 255       if (!task) return;
 256       const input = document.createElement("input");
 257       const desc = task.getElementsByClassName("desc")[0];
 258       const oldDescription = desc.textContent!;
 259       task.setAttribute("data-description", oldDescription);
 260       input.value = oldDescription;
 261       input.addEventListener("blur", this.completeEdit, { once: true });
 262       desc.textContent = "";
 263       task.insertBefore(input, task.firstChild);
 264       input.focus();
 265       event.preventDefault();
 266     },
 267
 268     beginTagEdit: function (event: Event) {
 269       const task = document.activeElement;
 270       if (!task) return;
 271       const input = document.createElement("input");
 272       input.classList.add("tag");
 273       input.addEventListener("blur", this.completeTagEdit, { once: true });
 274       input.value = lastTagNameEntered;
 275       task.appendChild(input);
 276       input.focus();
 277       input.select();
 278       event.preventDefault();
 279     },
 280
 281     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 282       const input = event.target as HTMLInputElement;
 283       const task = input.parentElement!;
 284       const desc = task.getElementsByClassName("desc")[0];
 285       const oldDescription = task.getAttribute("data-description")!;
 286       const newDescription = input.value;
 287       input.removeEventListener("blur", this.completeEdit);
 288       task.removeChild(input);
 289       task.removeAttribute("data-description");
 290       task.focus();
 291       if (newDescription === oldDescription || resolution === CommitOrAbort.Abort) {
 292         desc.textContent = oldDescription;
 293       } else {
 294         ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 295       }
 296     },
 297
 298     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 299       const input = event.target as HTMLInputElement;
 300       const task = input.parentElement!;
 301       const newTagName = input.value;
 302       input.removeEventListener("blur", this.completeTagEdit);
 303       task.removeChild(input);
 304       task.focus();
 305       if (resolution === CommitOrAbort.Commit && newTagName && !Model.hasTag(task, newTagName)) {
 306         ui.addTag(task.getAttribute("data-created")!, newTagName);
 307         lastTagNameEntered = newTagName;
 308       }
 309     },
 310
 311     firstVisibleTask: function () {
 312       for (const task of document.getElementsByClassName("task")) {
 313         if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
 314           return task;
 315         }
 316       }
 317     },
 318
 319     focusTaskNameInput: function (event: Event) {
 320       if (document.activeElement instanceof HTMLElement) {
 321         taskFocusedBeforeJumpingToInput = document.activeElement;
 322       }
 323       document.getElementById("taskName")!.focus();
 324       event.preventDefault();
 325     },
 326
 327     visibleTaskAtOffset(task: Element, offset: number): Element {
 328       var cursor: Element | null = task;
 329       var valid_cursor = cursor;
 330       const increment = offset / Math.abs(offset);
 331       while (true) {
 332         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 333         if (!cursor || !(cursor instanceof HTMLElement)) break;
 334         if (cursor.getAttribute("data-state")! === currentViewState) {
 335           offset -= increment;
 336           valid_cursor = cursor;
 337         }
 338         if (Math.abs(offset) < 0.5) break;
 339       }
 340       return valid_cursor;
 341     },
 342
 343     moveCursor: function (offset: number): boolean {
 344       const active = document.activeElement;
 345       if (!active) return false;
 346       const dest = this.visibleTaskAtOffset(active, offset);
 347       if (dest !== active && dest instanceof HTMLElement) {
 348         dest.focus();
 349         return true;
 350       }
 351       return false;
 352     },
 353
 354     moveTask: function (offset: number) {
 355       const active = document.activeElement;
 356       if (!active) return;
 357       const dest = this.visibleTaskAtOffset(active, offset);
 358       if (dest === active) return; // Already extremal
 359       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 360       if (onePastDest == dest) onePastDest = null; // Will become extremal
 361       if (offset > 0) {
 362         this.setPriority(active, dest, onePastDest);
 363       } else {
 364         this.setPriority(active, onePastDest, dest);
 365       }
 366     },
 367
 368     returnFocusAfterInput: function (): boolean {
 369       if (taskFocusedBeforeJumpingToInput) {
 370         taskFocusedBeforeJumpingToInput.focus();
 371         return true;
 372       }
 373       return false;
 374     },
 375
 376     // Change task's priority to be between other tasks a and b.
 377     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 378       const aPriority = a === null ? 0 : Model.getPriority(a);
 379       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 380       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 381       const span = bPriority - aPriority;
 382       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 383       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 384       const newPriorityRounded = Math.round(newPriority);
 385       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 386       ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 387       task instanceof HTMLElement && task.focus();
 388     },
 389
 390     setState: function (newState: string) {
 391       const task = document.activeElement;
 392       if (!task) return;
 393       const oldState = task.getAttribute("data-state")!;
 394       if (newState === oldState) return;
 395       const createTimestamp = task.getAttribute("data-created")!;
 396       this.moveCursor(1) || this.moveCursor(-1);
 397       return ui.setState(createTimestamp, newState, oldState);
 398     },
 399
 400     setView: function (state: string, color: string) {
 401       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 402       sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 403       sheet.insertRule(`:root { --view-state-indicator-color: ${color}; }`);
 404       sheet.removeRule(2);
 405       sheet.removeRule(2);
 406       currentViewState = state;
 407       if (document.activeElement?.getAttribute("data-state") !== state) {
 408         this.firstVisibleTask()?.focus();
 409       }
 410     },
 411
 412     undo: function () {
 413       const ret = ui.undo();
 414       if (ret && ret instanceof HTMLElement) ret.focus();
 415     },
 416   };
 417 }
 418 const browserUI = BrowserUI();
 419
 420 enum InputState {
 421   Command,
 422   View,
 423 }
 424 var inputState = InputState.Command;
 425
 426 function handleKey(event: any) {
 427   if (event.target.tagName === "INPUT") {
 428     if (event.target.id === "taskName") {
 429       if (event.key == "Enter") return browserUI.addTask(event);
 430       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 431     } else if (event.target.classList.contains("tag")) {
 432       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 433       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 434     } else {
 435       if (event.key == "Enter") return browserUI.completeEdit(event);
 436       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 437     }
 438   } else {
 439     if (inputState === InputState.Command) {
 440       if (event.key == "j") return browserUI.moveCursor(1);
 441       if (event.key == "k") return browserUI.moveCursor(-1);
 442       if (event.key == "J") return browserUI.moveTask(1);
 443       if (event.key == "K") return browserUI.moveTask(-1);
 444       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 445       if (event.key == "c") return browserUI.setState("cancelled");
 446       if (event.key == "d") return browserUI.setState("done");
 447       if (event.key == "q") return browserUI.setState("todo");
 448       if (event.key == "s") return browserUI.setState("someday-maybe");
 449       if (event.key == "w") return browserUI.setState("waiting");
 450       if (event.key == "X") return browserUI.setState("deleted");
 451       if (event.key == "u") return browserUI.undo();
 452       if (event.key == "e") return browserUI.beginEdit(event);
 453       if (event.key == "t") return browserUI.beginTagEdit(event);
 454       if (event.key == "v") return (inputState = InputState.View);
 455     } else if (inputState === InputState.View) {
 456       inputState = InputState.Command;
 457       if (event.key == "c") return browserUI.setView("cancelled", "Red");
 458       if (event.key == "d") return browserUI.setView("done", "LawnGreen");
 459       if (event.key == "q") return browserUI.setView("todo", "White");
 460       if (event.key == "s") return browserUI.setView("someday-maybe", "DeepSkyBlue");
 461       if (event.key == "w") return browserUI.setView("waiting", "MediumOrchid");
 462       if (event.key == "x") return browserUI.setView("deleted", "Black");
 463     }
 464   }
 465 }
 466
 467 function browserInit() {
 468   document.body.addEventListener("keydown", handleKey, { capture: false });
 469   log.replay();
 470   browserUI.firstVisibleTask()?.focus();
 471 }