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     task.appendChild(tag);
  64     return tag;
  65   },
  66
  67   edit: function (createTimestamp: string, newDescription: string): Element | null {
  68     const target = this.getTask(createTimestamp);
  69     if (!target) return null;
  70     if (target.hasAttribute("data-description")) {
  71       // Oh no: An edit has arrived from a replica while a local edit is in progress.
  72       const input = target.firstChild as HTMLInputElement;
  73       if (
  74         input.value === target.getAttribute("data-description") &&
  75         input.selectionStart === input.value.length &&
  76         input.selectionEnd === input.value.length
  77       ) {
  78         // No local changes have actually been made yet.  Change the contents of the edit box!
  79         input.value = newDescription;
  80       } else {
  81         // No great options.
  82         // Prefer not to interrupt the local user's edit.
  83         // The remote edit is mostly lost; this mostly becomes last-write-wins.
  84         target.setAttribute("data-description", newDescription);
  85       }
  86     } else {
  87       target.getElementsByClassName("desc")[0].textContent = newDescription;
  88     }
  89     return target;
  90   },
  91
  92   hasTag: function (task: Element, tag: string): Element | null {
  93     for (const child of task.getElementsByClassName("tag")) {
  94       if (child.textContent === tag) {
  95         return child;
  96       }
  97     }
  98     return null;
  99   },
 100
 101   getPriority: function (task: Element): number {
 102     if (task.hasAttribute("data-priority")) {
 103       return parseFloat(task.getAttribute("data-priority")!);
 104     }
 105     return parseFloat(task.getAttribute("data-created")!);
 106   },
 107
 108   getTask: function (createTimestamp: string) {
 109     for (const task of document.getElementsByClassName("task")) {
 110       if (task.getAttribute("data-created") === createTimestamp) {
 111         return task;
 112       }
 113     }
 114   },
 115
 116   setPriority: function (createTimestamp: string, priority: number): Element | null {
 117     const target = this.getTask(createTimestamp);
 118     if (!target) return null;
 119     target.setAttribute("data-priority", `${priority}`);
 120     for (const task of document.getElementsByClassName("task")) {
 121       if (task !== target && this.getPriority(task) > priority) {
 122         task.parentElement!.insertBefore(target, task);
 123         return target;
 124       }
 125     }
 126     document.getElementById("tasks")!.appendChild(target);
 127     return target;
 128   },
 129
 130   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 131     const task = this.getTask(createTimestamp);
 132     if (task) {
 133       task.setAttribute("data-state", state);
 134     }
 135   },
 136 };
 137
 138 function Log(prefix: string = "vp-") {
 139   var next_log_index = 0;
 140   return {
 141     apply: function (entry: string) {
 142       const [timestamp, command, data] = splitN(entry, " ", 2);
 143       if (command == "Create") {
 144         return Model.addTask(timestamp, data);
 145       }
 146       if (command == "Edit") {
 147         const [createTimestamp, description] = splitN(data, " ", 1);
 148         return Model.edit(createTimestamp, description);
 149       }
 150       if (command == "Priority") {
 151         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 152         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 153       }
 154       if (command == "State") {
 155         const [createTimestamp, state] = splitN(data, " ", 1);
 156         return Model.setState(timestamp, createTimestamp, state);
 157       }
 158       if (command == "Tag") {
 159         const [createTimestamp, tag] = splitN(data, " ", 1);
 160         return Model.addTag(createTimestamp, tag);
 161       }
 162     },
 163
 164     record: function (entry: string) {
 165       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 166     },
 167
 168     recordAndApply: function (entry: string) {
 169       this.record(entry);
 170       return this.apply(entry);
 171     },
 172
 173     replay: function () {
 174       while (true) {
 175         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 176         if (entry === null) {
 177           break;
 178         }
 179         this.apply(entry);
 180         next_log_index++;
 181       }
 182     },
 183   };
 184 }
 185 const log = Log();
 186
 187 function UI() {
 188   const undoLog: string[] = [];
 189   return {
 190     addTask: function (description: string): Element {
 191       const now = clock.now();
 192       undoLog.push(`State ${now} deleted`);
 193       return <Element>log.recordAndApply(`${now} Create ${description}`);
 194     },
 195     addTag: function (createTimestamp: string, tag: string) {
 196       // TODO: undo
 197       return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
 198     },
 199     edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 200       undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 201       return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 202     },
 203     setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 204       undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 205       return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 206     },
 207     setState: function (createTimestamp: string, newState: string, oldState: string) {
 208       undoLog.push(`State ${createTimestamp} ${oldState}`);
 209       return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 210     },
 211     undo: function () {
 212       if (undoLog.length > 0) {
 213         return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 214       }
 215     },
 216   };
 217 }
 218 const ui = UI();
 219
 220 enum CommitOrAbort {
 221   Commit,
 222   Abort,
 223 }
 224
 225 function BrowserUI() {
 226   var currentViewState = "todo";
 227   var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
 228   var lastTagNameEntered = "";
 229   return {
 230     addTask: function (event: KeyboardEvent) {
 231       const input = <HTMLInputElement>document.getElementById("taskName");
 232       if (input.value) {
 233         const task = ui.addTask(input.value);
 234         if (currentViewState === "todo") {
 235           task instanceof HTMLElement && task.focus();
 236         } else if (this.returnFocusAfterInput()) {
 237         } else {
 238           this.firstVisibleTask()?.focus();
 239         }
 240         input.value = "";
 241         if (event.getModifierState("Control")) {
 242           this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 243         }
 244       }
 245     },
 246
 247     beginEdit: function (event: Event) {
 248       const task = document.activeElement;
 249       if (!task) return;
 250       const input = document.createElement("input");
 251       const desc = task.getElementsByClassName("desc")[0];
 252       const oldDescription = desc.textContent!;
 253       task.setAttribute("data-description", oldDescription);
 254       input.value = oldDescription;
 255       input.addEventListener("blur", this.completeEdit, { once: true });
 256       desc.textContent = "";
 257       task.insertBefore(input, task.firstChild);
 258       input.focus();
 259       event.preventDefault();
 260     },
 261
 262     beginTagEdit: function (event: Event) {
 263       const task = document.activeElement;
 264       if (!task) return;
 265       const input = document.createElement("input");
 266       input.classList.add("tag");
 267       input.addEventListener("blur", this.completeTagEdit, { once: true });
 268       input.value = lastTagNameEntered;
 269       task.appendChild(input);
 270       input.focus();
 271       input.select();
 272       event.preventDefault();
 273     },
 274
 275     completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 276       const input = event.target as HTMLInputElement;
 277       const task = input.parentElement!;
 278       const desc = task.getElementsByClassName("desc")[0];
 279       const oldDescription = task.getAttribute("data-description")!;
 280       const newDescription = input.value;
 281       input.removeEventListener("blur", this.completeEdit);
 282       task.removeChild(input);
 283       task.removeAttribute("data-description");
 284       task.focus();
 285       if (newDescription === oldDescription || resolution === CommitOrAbort.Abort) {
 286         desc.textContent = oldDescription;
 287       } else {
 288         ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 289       }
 290     },
 291
 292     completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
 293       const input = event.target as HTMLInputElement;
 294       const task = input.parentElement!;
 295       const newTagName = input.value;
 296       input.removeEventListener("blur", this.completeTagEdit);
 297       task.removeChild(input);
 298       task.focus();
 299       if (resolution === CommitOrAbort.Commit && newTagName && !Model.hasTag(task, newTagName)) {
 300         ui.addTag(task.getAttribute("data-created")!, newTagName);
 301         lastTagNameEntered = newTagName;
 302       }
 303     },
 304
 305     firstVisibleTask: function () {
 306       for (const task of document.getElementsByClassName("task")) {
 307         if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
 308           return task;
 309         }
 310       }
 311     },
 312
 313     focusTaskNameInput: function (event: Event) {
 314       if (document.activeElement instanceof HTMLElement) {
 315         taskFocusedBeforeJumpingToInput = document.activeElement;
 316       }
 317       document.getElementById("taskName")!.focus();
 318       event.preventDefault();
 319     },
 320
 321     visibleTaskAtOffset(task: Element, offset: number): Element {
 322       var cursor: Element | null = task;
 323       var valid_cursor = cursor;
 324       const increment = offset / Math.abs(offset);
 325       while (true) {
 326         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 327         if (!cursor || !(cursor instanceof HTMLElement)) break;
 328         if (cursor.getAttribute("data-state")! === currentViewState) {
 329           offset -= increment;
 330           valid_cursor = cursor;
 331         }
 332         if (Math.abs(offset) < 0.5) break;
 333       }
 334       return valid_cursor;
 335     },
 336
 337     moveCursor: function (offset: number): boolean {
 338       const active = document.activeElement;
 339       if (!active) return false;
 340       const dest = this.visibleTaskAtOffset(active, offset);
 341       if (dest !== active && dest instanceof HTMLElement) {
 342         dest.focus();
 343         return true;
 344       }
 345       return false;
 346     },
 347
 348     moveTask: function (offset: number) {
 349       const active = document.activeElement;
 350       if (!active) return;
 351       const dest = this.visibleTaskAtOffset(active, offset);
 352       if (dest === active) return; // Already extremal
 353       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 354       if (onePastDest == dest) onePastDest = null; // Will become extremal
 355       if (offset > 0) {
 356         this.setPriority(active, dest, onePastDest);
 357       } else {
 358         this.setPriority(active, onePastDest, dest);
 359       }
 360     },
 361
 362     returnFocusAfterInput: function (): boolean {
 363       if (taskFocusedBeforeJumpingToInput) {
 364         taskFocusedBeforeJumpingToInput.focus();
 365         return true;
 366       }
 367       return false;
 368     },
 369
 370     // Change task's priority to be between other tasks a and b.
 371     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 372       const aPriority = a === null ? 0 : Model.getPriority(a);
 373       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 374       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 375       const span = bPriority - aPriority;
 376       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 377       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 378       const newPriorityRounded = Math.round(newPriority);
 379       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 380       ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 381       task instanceof HTMLElement && task.focus();
 382     },
 383
 384     setState: function (newState: string) {
 385       const task = document.activeElement;
 386       if (!task) return;
 387       const oldState = task.getAttribute("data-state")!;
 388       if (newState === oldState) return;
 389       const createTimestamp = task.getAttribute("data-created")!;
 390       this.moveCursor(1) || this.moveCursor(-1);
 391       return ui.setState(createTimestamp, newState, oldState);
 392     },
 393
 394     setView: function (state: string) {
 395       const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
 396       sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
 397       sheet.removeRule(1);
 398       currentViewState = state;
 399       if (document.activeElement?.getAttribute("data-state") !== state) {
 400         this.firstVisibleTask()?.focus();
 401       }
 402     },
 403
 404     undo: function () {
 405       const ret = ui.undo();
 406       if (ret && ret instanceof HTMLElement) ret.focus();
 407     },
 408   };
 409 }
 410 const browserUI = BrowserUI();
 411
 412 enum InputState {
 413   Command,
 414   View,
 415 }
 416 var inputState = InputState.Command;
 417
 418 function handleKey(event: any) {
 419   if (event.target.tagName === "INPUT") {
 420     if (event.target.id === "taskName") {
 421       if (event.key == "Enter") return browserUI.addTask(event);
 422       if (event.key == "Escape") return browserUI.returnFocusAfterInput();
 423     } else if (event.target.classList.contains("tag")) {
 424       if (event.key == "Enter") return browserUI.completeTagEdit(event);
 425       if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
 426     } else {
 427       if (event.key == "Enter") return browserUI.completeEdit(event);
 428       if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
 429     }
 430   } else {
 431     if (inputState === InputState.Command) {
 432       if (event.key == "j") return browserUI.moveCursor(1);
 433       if (event.key == "k") return browserUI.moveCursor(-1);
 434       if (event.key == "J") return browserUI.moveTask(1);
 435       if (event.key == "K") return browserUI.moveTask(-1);
 436       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 437       if (event.key == "c") return browserUI.setState("cancelled");
 438       if (event.key == "d") return browserUI.setState("done");
 439       if (event.key == "q") return browserUI.setState("todo");
 440       if (event.key == "s") return browserUI.setState("someday-maybe");
 441       if (event.key == "w") return browserUI.setState("waiting");
 442       if (event.key == "X") return browserUI.setState("deleted");
 443       if (event.key == "u") return browserUI.undo();
 444       if (event.key == "e") return browserUI.beginEdit(event);
 445       if (event.key == "t") return browserUI.beginTagEdit(event);
 446       if (event.key == "v") return (inputState = InputState.View);
 447     } else if (inputState === InputState.View) {
 448       inputState = InputState.Command;
 449       if (event.key == "c") return browserUI.setView("cancelled");
 450       if (event.key == "d") return browserUI.setView("done");
 451       if (event.key == "q") return browserUI.setView("todo");
 452       if (event.key == "s") return browserUI.setView("someday-maybe");
 453       if (event.key == "w") return browserUI.setView("waiting");
 454       if (event.key == "x") return browserUI.setView("deleted");
 455     }
 456   }
 457 }
 458
 459 function browserInit() {
 460   document.body.addEventListener("keydown", handleKey, { capture: false });
 461   log.replay();
 462   browserUI.firstVisibleTask()?.focus();
 463 }