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     document.getElementById("tasks")!.appendChild(task);
  40     return task;
  41   },
  42
  43   edit: function (createTimestamp: string, newDescription: string): Element | null {
  44     const target = this.getTask(createTimestamp);
  45     if (!target) return null;
  46     if (target.hasAttribute("data-description")) {
  47       // Oh no: An edit has arrived from a replica while a local edit is in progress.
  48       const input = target.children[0] as HTMLInputElement;
  49       if (
  50         input.value === target.getAttribute("data-description") &&
  51         input.selectionStart === 0 &&
  52         input.selectionEnd === input.value.length
  53       ) {
  54         // No local changes have actually been made yet.  Change the contents of the edit box!
  55         input.value = newDescription;
  56         input.select();
  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   getState: function (task: Element): string {
  77     return task.getAttribute("data-state") ?? "todo";
  78   },
  79
  80   getTask: function (createTimestamp: string) {
  81     for (const task of document.getElementsByClassName("task")) {
  82       if (task.getAttribute("data-created") === createTimestamp) {
  83         return task;
  84       }
  85     }
  86   },
  87
  88   setPriority: function (createTimestamp: string, priority: number): Element | null {
  89     const target = this.getTask(createTimestamp);
  90     if (!target) return null;
  91     target.setAttribute("data-priority", `${priority}`);
  92     for (const task of document.getElementsByClassName("task")) {
  93       if (task !== target && this.getPriority(task) > priority) {
  94         task.parentElement!.insertBefore(target, task);
  95         return target;
  96       }
  97     }
  98     document.getElementById("tasks")!.appendChild(target);
  99     return target;
 100   },
 101
 102   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
 103     const task = this.getTask(createTimestamp);
 104     if (task) {
 105       task.setAttribute("data-state", state);
 106       if (task instanceof HTMLElement) {
 107         task.style.display = state == "todo" ? "block" : "none"; // Until view filtering
 108       }
 109     }
 110   },
 111 };
 112
 113 function Log(prefix: string = "vp-") {
 114   var next_log_index = 0;
 115   return {
 116     apply: function (entry: string) {
 117       const [timestamp, command, data] = splitN(entry, " ", 2);
 118       if (command == "Create") {
 119         return Model.addTask(timestamp, data);
 120       }
 121       if (command == "Edit") {
 122         const [createTimestamp, description] = splitN(data, " ", 1);
 123         return Model.edit(createTimestamp, description);
 124       }
 125       if (command == "State") {
 126         const [createTimestamp, state] = splitN(data, " ", 1);
 127         return Model.setState(timestamp, createTimestamp, state);
 128       }
 129       if (command == "Priority") {
 130         const [createTimestamp, newPriority] = splitN(data, " ", 1);
 131         return Model.setPriority(createTimestamp, parseFloat(newPriority));
 132       }
 133     },
 134
 135     record: function (entry: string) {
 136       window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
 137     },
 138
 139     recordAndApply: function (entry: string) {
 140       this.record(entry);
 141       return this.apply(entry);
 142     },
 143
 144     replay: function () {
 145       while (true) {
 146         const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
 147         if (entry === null) {
 148           break;
 149         }
 150         this.apply(entry);
 151         next_log_index++;
 152       }
 153     },
 154   };
 155 }
 156 const log = Log();
 157
 158 const undoLog: string[] = [];
 159
 160 const UI = {
 161   addTask: function (description: string): Element {
 162     const now = clock.now();
 163     undoLog.push(`State ${now} deleted`);
 164     return <Element>log.recordAndApply(`${now} Create ${description}`);
 165   },
 166   edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
 167     undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
 168     return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
 169   },
 170   setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
 171     undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
 172     return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
 173   },
 174   setState: function (createTimestamp: string, newState: string, oldState: string) {
 175     undoLog.push(`State ${createTimestamp} ${oldState}`);
 176     return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
 177   },
 178   undo: function () {
 179     if (undoLog.length > 0) {
 180       return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
 181     }
 182   },
 183 };
 184
 185 const BrowserUI = {
 186   addTask: function (event: KeyboardEvent) {
 187     const input = <HTMLInputElement>document.getElementById("taskName");
 188     if (input.value) {
 189       const task = UI.addTask(input.value);
 190       if (task && task instanceof HTMLElement) task.focus();
 191       input.value = "";
 192       if (event.getModifierState("Control")) {
 193         this.setPriority(task, null, document.getElementsByClassName("task")[0]);
 194       }
 195     }
 196   },
 197
 198   beginEdit: function (event: Event) {
 199     const task = document.activeElement;
 200     if (!task) return;
 201     const input = document.createElement("input");
 202     const oldDescription = task.textContent!;
 203     task.setAttribute("data-description", oldDescription);
 204     input.value = oldDescription;
 205     input.addEventListener("blur", BrowserUI.completeEdit, { once: true });
 206     task.textContent = "";
 207     task.appendChild(input);
 208     input.focus();
 209     input.select();
 210     event.preventDefault();
 211   },
 212
 213   completeEdit: function (event: Event) {
 214     const input = event.target as HTMLInputElement;
 215     const task = input.parentElement!;
 216     const oldDescription = task.getAttribute("data-description")!;
 217     const newDescription = input.value;
 218     input.removeEventListener("blur", BrowserUI.completeEdit);
 219     task.removeChild(task.children[0]);
 220     task.removeAttribute("data-description");
 221     task.focus();
 222     if (newDescription === oldDescription) {
 223       task.textContent = oldDescription;
 224     } else {
 225       UI.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
 226     }
 227   },
 228
 229   firstVisibleTask: function () {
 230     for (const task of document.getElementsByClassName("task")) {
 231       if (task instanceof HTMLElement && task.style.display !== "none") {
 232         return task;
 233       }
 234     }
 235   },
 236
 237   focusTaskNameInput: function (event: Event) {
 238     document.getElementById("taskName")!.focus();
 239     event.preventDefault();
 240   },
 241
 242   visibleTaskAtOffset(task: Element, offset: number): Element {
 243     var cursor: Element | null = task;
 244     var valid_cursor = cursor;
 245     const increment = offset / Math.abs(offset);
 246     while (true) {
 247       cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
 248       if (!cursor || !(cursor instanceof HTMLElement)) break;
 249       if (cursor.style.display !== "none") {
 250         offset -= increment;
 251         valid_cursor = cursor;
 252       }
 253       if (Math.abs(offset) < 0.5) break;
 254     }
 255     return valid_cursor;
 256   },
 257
 258   moveCursor: function (offset: number): boolean {
 259     const active = document.activeElement;
 260     if (!active) return false;
 261     const dest = this.visibleTaskAtOffset(active, offset);
 262     if (dest !== active && dest instanceof HTMLElement) {
 263       dest.focus();
 264       return true;
 265     }
 266     return false;
 267   },
 268
 269   moveTask: function (offset: number) {
 270     const active = document.activeElement;
 271     if (!active) return;
 272     const dest = this.visibleTaskAtOffset(active, offset);
 273     if (dest === active) return; // Already extremal
 274     var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
 275     if (onePastDest == dest) onePastDest = null; // Will become extremal
 276     if (offset > 0) {
 277       this.setPriority(active, dest, onePastDest);
 278     } else {
 279       this.setPriority(active, onePastDest, dest);
 280     }
 281   },
 282
 283   // Change task's priority to be between other tasks a and b.
 284   setPriority: function (task: Element, a: Element | null, b: Element | null) {
 285     const aPriority = a === null ? 0 : Model.getPriority(a);
 286     const bPriority = b === null ? clock.now() : Model.getPriority(b);
 287     console.assert(aPriority < bPriority, aPriority, "<", bPriority);
 288     const span = bPriority - aPriority;
 289     const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
 290     console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
 291     const newPriorityRounded = Math.round(newPriority);
 292     const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
 293     UI.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
 294     task instanceof HTMLElement && task.focus();
 295   },
 296
 297   setState: function (newState: string) {
 298     const task = document.activeElement;
 299     if (!task) return;
 300     const oldState = Model.getState(task);
 301     if (newState === oldState) return;
 302     const createTimestamp = task.getAttribute("data-created")!;
 303     this.moveCursor(1) || this.moveCursor(-1);
 304     return UI.setState(createTimestamp, newState, oldState);
 305   },
 306
 307   undo: function () {
 308     const ret = UI.undo();
 309     if (ret && ret instanceof HTMLElement) ret.focus();
 310   },
 311 };
 312
 313 enum InputState {
 314   Command,
 315   View,
 316 }
 317 var inputState = InputState.Command;
 318
 319 function handleKey(event: any) {
 320   if (event.target.tagName === "INPUT") {
 321     if (event.target.id === "taskName") {
 322       if (event.key == "Enter") return BrowserUI.addTask(event);
 323     } else {
 324       if (event.key == "Enter") return BrowserUI.completeEdit(event);
 325     }
 326   } else {
 327     if (inputState === InputState.Command) {
 328       if (event.key == "j") return BrowserUI.moveCursor(1);
 329       if (event.key == "k") return BrowserUI.moveCursor(-1);
 330       if (event.key == "J") return BrowserUI.moveTask(1);
 331       if (event.key == "K") return BrowserUI.moveTask(-1);
 332       if (event.key == "n") return BrowserUI.focusTaskNameInput(event);
 333       if (event.key == "s") return BrowserUI.setState("someday-maybe");
 334       if (event.key == "w") return BrowserUI.setState("waiting");
 335       if (event.key == "d") return BrowserUI.setState("done");
 336       if (event.key == "c") return BrowserUI.setState("cancelled");
 337       if (event.key == "t") return BrowserUI.setState("todo");
 338       if (event.key == "X") return BrowserUI.setState("deleted");
 339       if (event.key == "u") return BrowserUI.undo();
 340       if (event.key == "e") return BrowserUI.beginEdit(event);
 341       if (event.key == "v") return (inputState = InputState.View);
 342     } else if (inputState === InputState.View) {
 343       return (inputState = InputState.Command);
 344     }
 345   }
 346 }
 347
 348 function browserInit() {
 349   document.body.addEventListener("keydown", handleKey, { capture: false });
 350   log.replay();
 351   BrowserUI.firstVisibleTask()?.focus();
 352 }