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