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[vopamoi] / 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 == "s") return browserUI.setState("someday-maybe");
368 if (event.key == "t") return browserUI.setState("todo");
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 == "s") return browserUI.setView("someday-maybe");
379 if (event.key == "t") return browserUI.setView("todo");
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 }