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