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 const undoLog: string[] = [];
 153
 154 const UI = {
 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 function BrowserUI() {
 180   return {
 181     addTask: function (event: KeyboardEvent) {
 182       const input = <HTMLInputElement>document.getElementById("taskName");
 183       if (input.value) {
 184         const task = UI.addTask(input.value);
 185         if (task && task instanceof HTMLElement) task.focus();
 186         input.value = "";
 187         if (event.getModifierState("Control")) {
 188           this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 189         }
 190       }
 191     },
 192
 193     beginEdit: function (event: Event) {
 194       const task = document.activeElement;
 195       if (!task) return;
 196       const input = document.createElement("input");
 197       const oldDescription = task.textContent!;
 198       task.setAttribute("data-description", oldDescription);
 199       input.value = oldDescription;
 200       input.addEventListener("blur", this.completeEdit, { once: true });
 201       task.textContent = "";
 202       task.appendChild(input);
 203       input.focus();
 204       input.select();
 205       event.preventDefault();
 206     },
 207
 208     completeEdit: function (event: Event) {
 209       const input = event.target as HTMLInputElement;
 210       const task = input.parentElement!;
 211       const oldDescription = task.getAttribute("data-description")!;
 212       const newDescription = input.value;
 213       input.removeEventListener("blur", this.completeEdit);
 214       task.removeChild(task.children[0]);
 215       task.removeAttribute("data-description");
 216       task.focus();
 217       if (newDescription === oldDescription) {
 218         task.textContent = oldDescription;
 219       } else {
 220         UI.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 221       }
 222     },
 223
 224     firstVisibleTask: function () {
 225       for (const task of document.getElementsByClassName("task")) {
 226         if (task instanceof HTMLElement && task.getAttribute("data-state")! === "todo") {
 227           return task;
 228         }
 229       }
 230     },
 231
 232     focusTaskNameInput: function (event: Event) {
 233       document.getElementById("taskName")!.focus();
 234       event.preventDefault();
 235     },
 236
 237     visibleTaskAtOffset(task: Element, offset: number): Element {
 238       var cursor: Element | null = task;
 239       var valid_cursor = cursor;
 240       const increment = offset / Math.abs(offset);
 241       while (true) {
 242         cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 243         if (!cursor || !(cursor instanceof HTMLElement)) break;
 244         if (cursor.getAttribute("data-state")! === "todo") {
 245           offset -= increment;
 246           valid_cursor = cursor;
 247         }
 248         if (Math.abs(offset) < 0.5) break;
 249       }
 250       return valid_cursor;
 251     },
 252
 253     moveCursor: function (offset: number): boolean {
 254       const active = document.activeElement;
 255       if (!active) return false;
 256       const dest = this.visibleTaskAtOffset(active, offset);
 257       if (dest !== active && dest instanceof HTMLElement) {
 258         dest.focus();
 259         return true;
 260       }
 261       return false;
 262     },
 263
 264     moveTask: function (offset: number) {
 265       const active = document.activeElement;
 266       if (!active) return;
 267       const dest = this.visibleTaskAtOffset(active, offset);
 268       if (dest === active) return; // Already extremal
 269       var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 270       if (onePastDest == dest) onePastDest = null; // Will become extremal
 271       if (offset > 0) {
 272         this.setPriority(active, dest, onePastDest);
 273       } else {
 274         this.setPriority(active, onePastDest, dest);
 275       }
 276     },
 277
 278     // Change task's priority to be between other tasks a and b.
 279     setPriority: function (task: Element, a: Element | null, b: Element | null) {
 280       const aPriority = a === null ? 0 : Model.getPriority(a);
 281       const bPriority = b === null ? clock.now() : Model.getPriority(b);
 282       console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 283       const span = bPriority - aPriority;
 284       const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 285       console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 286       const newPriorityRounded = Math.round(newPriority);
 287       const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 288       UI.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 289       task instanceof HTMLElement && task.focus();
 290     },
 291
 292     setState: function (newState: string) {
 293       const task = document.activeElement;
 294       if (!task) return;
 295       const oldState = task.getAttribute("data-state")!;
 296       if (newState === oldState) return;
 297       const createTimestamp = task.getAttribute("data-created")!;
 298       this.moveCursor(1) || this.moveCursor(-1);
 299       return UI.setState(createTimestamp, newState, oldState);
 300     },
 301
 302     undo: function () {
 303       const ret = UI.undo();
 304       if (ret && ret instanceof HTMLElement) ret.focus();
 305     },
 306   };
 307 }
 308 const browserUI = BrowserUI();
 309
 310 enum InputState {
 311   Command,
 312   View,
 313 }
 314 var inputState = InputState.Command;
 315
 316 function handleKey(event: any) {
 317   if (event.target.tagName === "INPUT") {
 318     if (event.target.id === "taskName") {
 319       if (event.key == "Enter") return browserUI.addTask(event);
 320     } else {
 321       if (event.key == "Enter") return browserUI.completeEdit(event);
 322     }
 323   } else {
 324     if (inputState === InputState.Command) {
 325       if (event.key == "j") return browserUI.moveCursor(1);
 326       if (event.key == "k") return browserUI.moveCursor(-1);
 327       if (event.key == "J") return browserUI.moveTask(1);
 328       if (event.key == "K") return browserUI.moveTask(-1);
 329       if (event.key == "n") return browserUI.focusTaskNameInput(event);
 330       if (event.key == "s") return browserUI.setState("someday-maybe");
 331       if (event.key == "w") return browserUI.setState("waiting");
 332       if (event.key == "d") return browserUI.setState("done");
 333       if (event.key == "c") return browserUI.setState("cancelled");
 334       if (event.key == "t") return browserUI.setState("todo");
 335       if (event.key == "X") return browserUI.setState("deleted");
 336       if (event.key == "u") return browserUI.undo();
 337       if (event.key == "e") return browserUI.beginEdit(event);
 338       if (event.key == "v") return (inputState = InputState.View);
 339     } else if (inputState === InputState.View) {
 340       return (inputState = InputState.Command);
 341     }
 342   }
 343 }
 344
 345 function browserInit() {
 346   document.body.addEventListener("keydown", handleKey, { capture: false });
 347   log.replay();
 348   browserUI.firstVisibleTask()?.focus();
 349 }