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