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

   1 // Typescript doesn't know about MAX_SAFE_INTEGER??  This was supposed to be
   2 // fixed in typescript 2.0.1 in 2016, but is not working for me in typescript
   3 // 4.2.4 in 2022.  :( https://github.com/microsoft/TypeScript/issues/9937
   4 //const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER;
   5 const MAX_SAFE_INTEGER = 9007199254740991;
   6
   7 // A sane split that splits N *times*, leaving the last chunk unsplit.
   8 function splitN(str: string, delimiter: string, limit: number = MAX_SAFE_INTEGER): string[] {
   9   if (limit < 1) {
  10     return [str];
  11   }
  12   const at = str.indexOf(delimiter);
  13   return at === -1 ? [str] : [str.substring(0, at)].concat(splitN(str.substring(at + delimiter.length), delimiter, limit - 1));
  14 }
  15
  16 // A clock that never goes backwards; monotonic.
  17 function Clock() {
  18   var previousNow = Date.now();
  19   return {
  20     now: function (): number {
  21       const now = Date.now();
  22       if (now > previousNow) {
  23         previousNow = now;
  24         return now;
  25       }
  26       return ++previousNow;
  27     },
  28   };
  29 }
  30 const clock = Clock();
  31
  32 const Model = {
  33   addTask: function (timestamp: string, description: string): Element {
  34     const task = document.createElement("div");
  35     task.appendChild(document.createTextNode(description));
  36     task.classList.add("task");
  37     task.setAttribute("tabindex", "0");
  38     task.setAttribute("data-created", timestamp);
  39     task.setAttribute("data-state", "todo");
  40     document.getElementById("tasks")!.appendChild(task);
  41     return task;
  42   },
  43
  44   addTag: function (createTimestamp: string, tagName: string): Element | null {
  45     const task = this.getTask(createTimestamp);
  46     if (!task) return null;
  47     const existingTag = this.hasTag(task, tagName);
  48     if (existingTag) return existingTag;
  49     const tag = document.createElement("span");
  50     tag.appendChild(document.createTextNode(tagName));
  51     tag.classList.add("tag");
  52     tag.setAttribute("tabindex", "0");
  53     task.appendChild(tag);
  54     return tag;
  55   },
  56
  57   edit: function (createTimestamp: string, newDescription: string): Element | null {
  58     const target = this.getTask(createTimestamp);
  59     if (!target) return null;
  60     if (target.hasAttribute("data-description")) {
  61       // Oh no: An edit has arrived from a replica while a local edit is in progress.
  62       const input = target.firstChild as HTMLInputElement;
  63       if (
  64         input.value === target.getAttribute("data-description") &&
  65         input.selectionStart === input.value.length &&
  66         input.selectionEnd === input.value.length
  67       ) {
  68         // No local changes have actually been made yet.  Change the contents of the edit box!
  69         input.value = newDescription;
  70       } else {
  71         // No great options.
  72         // Prefer not to interrupt the local user's edit.
  73         // The remote edit is mostly lost; this mostly becomes last-write-wins.
  74         target.setAttribute("data-description", newDescription);
  75       }
  76     } else {
  77       target.textContent = newDescription;
  78     }
  79     return target;
  80   },
  81
  82   hasTag: function (task: Element, tag: string): Element | null {
  83     for (const child of task.children) {
  84       if (child.classList.contains("tag") && child.textContent === tag) {
  85         return child;
  86       }
  87     }
  88     return null;
  89   },
  90
  91   getPriority: function (task: Element): number {
  92     if (task.hasAttribute("data-priority")) {
  93       return parseFloat(task.getAttribute("data-priority")!);
  94     }
  95     return parseFloat(task.getAttribute("data-created")!);
  96   },
  97
  98   getTask: function (createTimestamp: string) {
  99     for (const task of document.getElementsByClassName("task")) {
 100       if (task.getAttribute("data-created") === createTimestamp) {
 101         return task;
 102       }
 103     }
 104   },
 105
 106   setPriority: function (createTimestamp: string, priority: number): Element | null {
 107     const target = this.getTask(createTimestamp);
 108     if (!target) return null;
 109     target.setAttribute("data-priority", `${priority}`);
 110     for (const task of document.getElementsByClassName("task")) {
 111       if (task !== target && this.getPriority(task) > priority) {
 112         task.parentElement!.insertBefore(target, task);
 113         return target;
 114       }
 115     }
 116     document.getElementById("tasks")!.appendChild(target);
 117     return target;
 118   },
 119
 120   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 121     const task = this.getTask(createTimestamp);
 122     if (task) {
 123       task.setAttribute("data-state", state);
 124     }
 125   },
 126 };
 127
 128 function Log(prefix: string = "vp-") {
 129   var next_log_index = 0;
 130   return {
 131     apply: function (entry: string) {
 132       const [timestamp, command, data] = splitN(entry, " ", 2);
 133       if (command == "Create") {
 134         return Model.addTask(timestamp, data);
 135       }
 136       if (command == "Edit") {
 137         const [createTimestamp, description] = splitN(data, " ", 1);
 138         return Model.edit(createTimestamp, description);
 139       }
 140       if (command == "Priority") {
 141         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 142         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 143       }
 144       if (command == "State") {
 145         const [createTimestamp, state] = splitN(data, " ", 1);
 146         return Model.setState(timestamp, createTimestamp, state);
 147       }
 148       if (command == "Tag") {
 149         const [createTimestamp, tag] = splitN(data, " ", 1);
 150         return Model.addTag(createTimestamp, tag);
 151       }
 152     },
 153
 154     record: function (entry: string) {
 155       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 156     },
 157
 158     recordAndApply: function (entry: string) {
 159       this.record(entry);
 160       return this.apply(entry);
 161     },
 162
 163     replay: function () {
 164       while (true) {
 165         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 166         if (entry === null) {
 167           break;
 168         }
 169         this.apply(entry);
 170         next_log_index++;
 171       }
 172     },
 173   };
 174 }
 175 const log = Log();
 176
 177 function UI() {
 178   const undoLog: string[] = [];
 179   return {
 180     addTask: function (description: string): Element {
 181       const now = clock.now();
 182       undoLog.push(`State ${now} deleted`);
 183       return <Element>log.recordAndApply(`${now} Create ${description}`);
 184     },
 185     addTag: function (createTimestamp: string, tag: string) {
 186       // TODO: undo
 187       return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
 188     },
 189     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 190       undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 191       return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 192     },
 193     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 194       undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 195       return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 196     },
 197     setState: function (createTimestamp: string, newState: string, oldState: string) {
 198       undoLog.push(`State ${createTimestamp} ${oldState}`);
 199       return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 200     },
 201     undo: function () {
 202       if (undoLog.length > 0) {
 203         return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 204       }
 205     },
 206   };
 207 }
 208 const ui = UI();
 209
 210 enum CommitOrAbort {
 211   Commit,
 212   Abort,
 213 }
 214
 215 function BrowserUI() {
 216   var currentViewState = "todo";
 217   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 218   var lastTagNameEntered = "";
 219   return {
 220     addTask: function (event: KeyboardEvent) {
 221       const input = <HTMLInputElement>document.getElementById("taskName");
 222       if (input.value) {
 223         const task = ui.addTask(input.value);
 224         if (currentViewState === "todo") {
 225           task instanceof HTMLElement && task.focus();
 226         } else if (this.returnFocusAfterInput()) {
 227         } else {
 228           this.firstVisibleTask()?.focus();
 229         }
 230         input.value = "";
 231         if (event.getModifierState("Control")) {
 232           this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 233         }
 234       }
 235     },
 236
 237     beginEdit: function (event: Event) {
 238       const task = document.activeElement;
 239       if (!task) return;
 240       const input = document.createElement("input");
 241       const oldDescription = task.textContent!;
 242       task.setAttribute("data-description", oldDescription);
 243       input.value = oldDescription;
 244       input.addEventListener("blur", this.completeEdit, { once: true });
 245       task.textContent = "";
 246       task.insertBefore(input, task.firstChild);
 247       input.focus();
 248       event.preventDefault();
 249     },
 250
 251     beginTagEdit: function (event: Event) {
 252       const task = document.activeElement;
 253       if (!task) return;
 254       const input = document.createElement("input");
 255       input.classList.add("tag");
 256       input.addEventListener("blur", this.completeTagEdit, { once: true });
 257       input.value = lastTagNameEntered;
 258       task.appendChild(input);
 259       input.focus();
 260       input.select();
 261       event.preventDefault();
 262     },
 263
 264     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 265       const input = event.target as HTMLInputElement;
 266       const task = input.parentElement!;
 267       const oldDescription = task.getAttribute("data-description")!;
 268       const newDescription = input.value;
 269       input.removeEventListener("blur", this.completeEdit);
 270       task.removeChild(input);
 271       task.removeAttribute("data-description");
 272       task.focus();
 273       if (newDescription === oldDescription || resolution === CommitOrAbort.Abort) {
 274         task.textContent = oldDescription;
 275       } else {
 276         ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 277       }
 278     },
 279
 280     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 281       const input = event.target as HTMLInputElement;
 282       const task = input.parentElement!;
 283       const newTagName = input.value;
 284       input.removeEventListener("blur", this.completeTagEdit);
 285       task.removeChild(input);
 286       task.focus();
 287       if (newTagName && !Model.hasTag(task, newTagName)) {
 288         ui.addTag(task.getAttribute("data-created")!, newTagName);
 289         lastTagNameEntered = newTagName;
 290       }
 291     },
 292
 293     firstVisibleTask: function () {
 294       for (const task of document.getElementsByClassName("task")) {
 295         if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
 296           return task;
 297         }
 298       }
 299     },
 300
 301     focusTaskNameInput: function (event: Event) {
 302       if (document.activeElement instanceof HTMLElement) {
 303         taskFocusedBeforeJumpingToInput = document.activeElement;
 304       }
 305       document.getElementById("taskName")!.focus();
 306       event.preventDefault();
 307     },
 308
 309     visibleTaskAtOffset(task: Element, offset: number): Element {
 310       var cursor: Element | null = task;
 311       var valid_cursor = cursor;
 312       const increment = offset / Math.abs(offset);
 313       while (true) {
 314         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 315         if (!cursor || !(cursor instanceof HTMLElement)) break;
 316         if (cursor.getAttribute("data-state")! === currentViewState) {
 317           offset -= increment;
 318           valid_cursor = cursor;
 319         }
 320         if (Math.abs(offset) < 0.5) break;
 321       }
 322       return valid_cursor;
 323     },
 324
 325     moveCursor: function (offset: number): boolean {
 326       const active = document.activeElement;
 327       if (!active) return false;
 328       const dest = this.visibleTaskAtOffset(active, offset);
 329       if (dest !== active && dest instanceof HTMLElement) {
 330         dest.focus();
 331         return true;
 332       }
 333       return false;
 334     },
 335
 336     moveTask: function (offset: number) {
 337       const active = document.activeElement;
 338       if (!active) return;
 339       const dest = this.visibleTaskAtOffset(active, offset);
 340       if (dest === active) return; // Already extremal
 341       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 342       if (onePastDest == dest) onePastDest = null; // Will become extremal
 343       if (offset > 0) {
 344         this.setPriority(active, dest, onePastDest);
 345       } else {
 346         this.setPriority(active, onePastDest, dest);
 347       }
 348     },
 349
 350     returnFocusAfterInput: function (): boolean {
 351       if (taskFocusedBeforeJumpingToInput) {
 352         taskFocusedBeforeJumpingToInput.focus();
 353         return true;
 354       }
 355       return false;
 356     },
 357
 358     // Change task's priority to be between other tasks a and b.
 359     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 360       const aPriority = a === null ? 0 : Model.getPriority(a);
 361       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 362       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 363       const span = bPriority - aPriority;
 364       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 365       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 366       const newPriorityRounded = Math.round(newPriority);
 367       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 368       ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 369       task instanceof HTMLElement && task.focus();
 370     },
 371
 372     setState: function (newState: string) {
 373       const task = document.activeElement;
 374       if (!task) return;
 375       const oldState = task.getAttribute("data-state")!;
 376       if (newState === oldState) return;
 377       const createTimestamp = task.getAttribute("data-created")!;
 378       this.moveCursor(1) || this.moveCursor(-1);
 379       return ui.setState(createTimestamp, newState, oldState);
 380     },
 381
 382     setView: function (state: string) {
 383       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 384       sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 385       sheet.removeRule(1);
 386       currentViewState = state;
 387       if (document.activeElement?.getAttribute("data-state") !== state) {
 388         this.firstVisibleTask()?.focus();
 389       }
 390     },
 391
 392     undo: function () {
 393       const ret = ui.undo();
 394       if (ret && ret instanceof HTMLElement) ret.focus();
 395     },
 396   };
 397 }
 398 const browserUI = BrowserUI();
 399
 400 enum InputState {
 401   Command,
 402   View,
 403 }
 404 var inputState = InputState.Command;
 405
 406 function handleKey(event: any) {
 407   if (event.target.tagName === "INPUT") {
 408     if (event.target.id === "taskName") {
 409       if (event.key == "Enter") return browserUI.addTask(event);
 410       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 411     } else if (event.target.classList.contains("tag")) {
 412       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 413       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 414     } else {
 415       if (event.key == "Enter") return browserUI.completeEdit(event);
 416       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 417     }
 418   } else {
 419     if (inputState === InputState.Command) {
 420       if (event.key == "j") return browserUI.moveCursor(1);
 421       if (event.key == "k") return browserUI.moveCursor(-1);
 422       if (event.key == "J") return browserUI.moveTask(1);
 423       if (event.key == "K") return browserUI.moveTask(-1);
 424       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 425       if (event.key == "c") return browserUI.setState("cancelled");
 426       if (event.key == "d") return browserUI.setState("done");
 427       if (event.key == "q") return browserUI.setState("todo");
 428       if (event.key == "s") return browserUI.setState("someday-maybe");
 429       if (event.key == "w") return browserUI.setState("waiting");
 430       if (event.key == "X") return browserUI.setState("deleted");
 431       if (event.key == "u") return browserUI.undo();
 432       if (event.key == "e") return browserUI.beginEdit(event);
 433       if (event.key == "t") return browserUI.beginTagEdit(event);
 434       if (event.key == "v") return (inputState = InputState.View);
 435     } else if (inputState === InputState.View) {
 436       inputState = InputState.Command;
 437       if (event.key == "c") return browserUI.setView("cancelled");
 438       if (event.key == "d") return browserUI.setView("done");
 439       if (event.key == "q") return browserUI.setView("todo");
 440       if (event.key == "s") return browserUI.setView("someday-maybe");
 441       if (event.key == "w") return browserUI.setView("waiting");
 442       if (event.key == "x") return browserUI.setView("deleted");
 443     }
 444   }
 445 }
 446
 447 function browserInit() {
 448   document.body.addEventListener("keydown", handleKey, { capture: false });
 449   log.replay();
 450   browserUI.firstVisibleTask()?.focus();
 451 }