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