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