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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 // Returns a promise for a hue based on a hash of the string
33 function hashHue(str: string) {
34 // Using crypto for this is overkill
35 return crypto.subtle.digest("SHA-256", new TextEncoder().encode(str)).then((buf) => (new Uint16Array(buf)[0] * 360) / 2 ** 16);
36 }
37
38 const Model = {
39 addTask: function (timestamp: string, description: string): Element {
40 const task = document.createElement("div");
41 const desc = document.createElement("span");
42 desc.textContent = description;
43 desc.classList.add("desc");
44 task.appendChild(desc);
45 task.classList.add("task");
46 task.setAttribute("tabindex", "0");
47 task.setAttribute("data-created", timestamp);
48 task.setAttribute("data-state", "todo");
49 document.getElementById("tasks")!.appendChild(task);
50 return task;
51 },
52
53 addTag: function (createTimestamp: string, tagName: string): Element | null {
54 const task = this.getTask(createTimestamp);
55 if (!task) return null;
56 const existingTag = this.hasTag(task, tagName);
57 if (existingTag) return existingTag;
58 const tag = document.createElement("span");
59 tag.appendChild(document.createTextNode(tagName));
60 tag.classList.add("tag");
61 tag.setAttribute("tabindex", "0");
62 hashHue(tagName).then((hue) => (tag.style.backgroundColor = `hsl(${hue},90%,45%)`));
63 task.appendChild(tag);
64 return tag;
65 },
66
67 edit: function (createTimestamp: string, newDescription: string): Element | null {
68 const target = this.getTask(createTimestamp);
69 if (!target) return null;
70 if (target.hasAttribute("data-description")) {
71 // Oh no: An edit has arrived from a replica while a local edit is in progress.
72 const input = target.firstChild as HTMLInputElement;
73 if (
74 input.value === target.getAttribute("data-description") &&
75 input.selectionStart === input.value.length &&
76 input.selectionEnd === input.value.length
77 ) {
78 // No local changes have actually been made yet. Change the contents of the edit box!
79 input.value = newDescription;
80 } else {
81 // No great options.
82 // Prefer not to interrupt the local user's edit.
83 // The remote edit is mostly lost; this mostly becomes last-write-wins.
84 target.setAttribute("data-description", newDescription);
85 }
86 } else {
87 target.getElementsByClassName("desc")[0].textContent = newDescription;
88 }
89 return target;
90 },
91
92 hasTag: function (task: Element, tag: string): Element | null {
93 for (const child of task.getElementsByClassName("tag")) {
94 if (child.textContent === tag) {
95 return child;
96 }
97 }
98 return null;
99 },
100
101 getPriority: function (task: Element): number {
102 if (task.hasAttribute("data-priority")) {
103 return parseFloat(task.getAttribute("data-priority")!);
104 }
105 return parseFloat(task.getAttribute("data-created")!);
106 },
107
108 getTask: function (createTimestamp: string) {
109 for (const task of document.getElementsByClassName("task")) {
110 if (task.getAttribute("data-created") === createTimestamp) {
111 return task;
112 }
113 }
114 },
115
116 setPriority: function (createTimestamp: string, priority: number): Element | null {
117 const target = this.getTask(createTimestamp);
118 if (!target) return null;
119 target.setAttribute("data-priority", `${priority}`);
120 for (const task of document.getElementsByClassName("task")) {
121 if (task !== target && this.getPriority(task) > priority) {
122 task.parentElement!.insertBefore(target, task);
123 return target;
124 }
125 }
126 document.getElementById("tasks")!.appendChild(target);
127 return target;
128 },
129
130 setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
131 const task = this.getTask(createTimestamp);
132 if (task) {
133 task.setAttribute("data-state", state);
134 }
135 },
136 };
137
138 function Log(prefix: string = "vp-") {
139 var next_log_index = 0;
140 return {
141 apply: function (entry: string) {
142 const [timestamp, command, data] = splitN(entry, " ", 2);
143 if (command == "Create") {
144 return Model.addTask(timestamp, data);
145 }
146 if (command == "Edit") {
147 const [createTimestamp, description] = splitN(data, " ", 1);
148 return Model.edit(createTimestamp, description);
149 }
150 if (command == "Priority") {
151 const [createTimestamp, newPriority] = splitN(data, " ", 1);
152 return Model.setPriority(createTimestamp, parseFloat(newPriority));
153 }
154 if (command == "State") {
155 const [createTimestamp, state] = splitN(data, " ", 1);
156 return Model.setState(timestamp, createTimestamp, state);
157 }
158 if (command == "Tag") {
159 const [createTimestamp, tag] = splitN(data, " ", 1);
160 return Model.addTag(createTimestamp, tag);
161 }
162 },
163
164 record: function (entry: string) {
165 window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
166 },
167
168 recordAndApply: function (entry: string) {
169 this.record(entry);
170 return this.apply(entry);
171 },
172
173 replay: function () {
174 while (true) {
175 const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
176 if (entry === null) {
177 break;
178 }
179 this.apply(entry);
180 next_log_index++;
181 }
182 },
183 };
184 }
185 const log = Log();
186
187 function UI() {
188 const undoLog: string[] = [];
189 return {
190 addTask: function (description: string): Element {
191 const now = clock.now();
192 undoLog.push(`State ${now} deleted`);
193 return <Element>log.recordAndApply(`${now} Create ${description}`);
194 },
195 addTag: function (createTimestamp: string, tag: string) {
196 // TODO: undo
197 return log.recordAndApply(`${clock.now()} Tag ${createTimestamp} ${tag}`);
198 },
199 edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
200 undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
201 return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
202 },
203 setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
204 undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
205 return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
206 },
207 setState: function (createTimestamp: string, newState: string, oldState: string) {
208 undoLog.push(`State ${createTimestamp} ${oldState}`);
209 return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
210 },
211 undo: function () {
212 if (undoLog.length > 0) {
213 return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
214 }
215 },
216 };
217 }
218 const ui = UI();
219
220 enum CommitOrAbort {
221 Commit,
222 Abort,
223 }
224
225 function BrowserUI() {
226 var currentViewState = "todo";
227 var taskFocusedBeforeJumpingToInput: HTMLElement | null = null;
228 var lastTagNameEntered = "";
229 return {
230 addTask: function (event: KeyboardEvent) {
231 const input = <HTMLInputElement>document.getElementById("taskName");
232 if (input.value) {
233 const task = ui.addTask(input.value);
234 if (currentViewState === "todo") {
235 task instanceof HTMLElement && task.focus();
236 } else if (this.returnFocusAfterInput()) {
237 } else {
238 this.firstVisibleTask()?.focus();
239 }
240 input.value = "";
241 if (event.getModifierState("Control")) {
242 this.setPriority(task, null, document.getElementsByClassName("task")[0]);
243 }
244 }
245 },
246
247 beginEdit: function (event: Event) {
248 const task = document.activeElement;
249 if (!task) return;
250 const input = document.createElement("input");
251 const desc = task.getElementsByClassName("desc")[0];
252 const oldDescription = desc.textContent!;
253 task.setAttribute("data-description", oldDescription);
254 input.value = oldDescription;
255 input.addEventListener("blur", this.completeEdit, { once: true });
256 desc.textContent = "";
257 task.insertBefore(input, task.firstChild);
258 input.focus();
259 event.preventDefault();
260 },
261
262 beginTagEdit: function (event: Event) {
263 const task = document.activeElement;
264 if (!task) return;
265 const input = document.createElement("input");
266 input.classList.add("tag");
267 input.addEventListener("blur", this.completeTagEdit, { once: true });
268 input.value = lastTagNameEntered;
269 task.appendChild(input);
270 input.focus();
271 input.select();
272 event.preventDefault();
273 },
274
275 completeEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
276 const input = event.target as HTMLInputElement;
277 const task = input.parentElement!;
278 const desc = task.getElementsByClassName("desc")[0];
279 const oldDescription = task.getAttribute("data-description")!;
280 const newDescription = input.value;
281 input.removeEventListener("blur", this.completeEdit);
282 task.removeChild(input);
283 task.removeAttribute("data-description");
284 task.focus();
285 if (newDescription === oldDescription || resolution === CommitOrAbort.Abort) {
286 desc.textContent = oldDescription;
287 } else {
288 ui.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
289 }
290 },
291
292 completeTagEdit: function (event: Event, resolution: CommitOrAbort = CommitOrAbort.Commit) {
293 const input = event.target as HTMLInputElement;
294 const task = input.parentElement!;
295 const newTagName = input.value;
296 input.removeEventListener("blur", this.completeTagEdit);
297 task.removeChild(input);
298 task.focus();
299 if (resolution === CommitOrAbort.Commit && newTagName && !Model.hasTag(task, newTagName)) {
300 ui.addTag(task.getAttribute("data-created")!, newTagName);
301 lastTagNameEntered = newTagName;
302 }
303 },
304
305 firstVisibleTask: function () {
306 for (const task of document.getElementsByClassName("task")) {
307 if (task instanceof HTMLElement && task.getAttribute("data-state") === currentViewState) {
308 return task;
309 }
310 }
311 },
312
313 focusTaskNameInput: function (event: Event) {
314 if (document.activeElement instanceof HTMLElement) {
315 taskFocusedBeforeJumpingToInput = document.activeElement;
316 }
317 document.getElementById("taskName")!.focus();
318 event.preventDefault();
319 },
320
321 visibleTaskAtOffset(task: Element, offset: number): Element {
322 var cursor: Element | null = task;
323 var valid_cursor = cursor;
324 const increment = offset / Math.abs(offset);
325 while (true) {
326 cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
327 if (!cursor || !(cursor instanceof HTMLElement)) break;
328 if (cursor.getAttribute("data-state")! === currentViewState) {
329 offset -= increment;
330 valid_cursor = cursor;
331 }
332 if (Math.abs(offset) < 0.5) break;
333 }
334 return valid_cursor;
335 },
336
337 moveCursor: function (offset: number): boolean {
338 const active = document.activeElement;
339 if (!active) return false;
340 const dest = this.visibleTaskAtOffset(active, offset);
341 if (dest !== active && dest instanceof HTMLElement) {
342 dest.focus();
343 return true;
344 }
345 return false;
346 },
347
348 moveTask: function (offset: number) {
349 const active = document.activeElement;
350 if (!active) return;
351 const dest = this.visibleTaskAtOffset(active, offset);
352 if (dest === active) return; // Already extremal
353 var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
354 if (onePastDest == dest) onePastDest = null; // Will become extremal
355 if (offset > 0) {
356 this.setPriority(active, dest, onePastDest);
357 } else {
358 this.setPriority(active, onePastDest, dest);
359 }
360 },
361
362 returnFocusAfterInput: function (): boolean {
363 if (taskFocusedBeforeJumpingToInput) {
364 taskFocusedBeforeJumpingToInput.focus();
365 return true;
366 }
367 return false;
368 },
369
370 // Change task's priority to be between other tasks a and b.
371 setPriority: function (task: Element, a: Element | null, b: Element | null) {
372 const aPriority = a === null ? 0 : Model.getPriority(a);
373 const bPriority = b === null ? clock.now() : Model.getPriority(b);
374 console.assert(aPriority < bPriority, aPriority, "<", bPriority);
375 const span = bPriority - aPriority;
376 const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
377 console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
378 const newPriorityRounded = Math.round(newPriority);
379 const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
380 ui.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
381 task instanceof HTMLElement && task.focus();
382 },
383
384 setState: function (newState: string) {
385 const task = document.activeElement;
386 if (!task) return;
387 const oldState = task.getAttribute("data-state")!;
388 if (newState === oldState) return;
389 const createTimestamp = task.getAttribute("data-created")!;
390 this.moveCursor(1) || this.moveCursor(-1);
391 return ui.setState(createTimestamp, newState, oldState);
392 },
393
394 setView: function (state: string) {
395 const sheet = (document.getElementById("viewStyle") as HTMLStyleElement).sheet!;
396 sheet.insertRule(`.task:not([data-state=${state}]) { display: none }`);
397 sheet.removeRule(1);
398 currentViewState = state;
399 if (document.activeElement?.getAttribute("data-state") !== state) {
400 this.firstVisibleTask()?.focus();
401 }
402 },
403
404 undo: function () {
405 const ret = ui.undo();
406 if (ret && ret instanceof HTMLElement) ret.focus();
407 },
408 };
409 }
410 const browserUI = BrowserUI();
411
412 enum InputState {
413 Command,
414 View,
415 }
416 var inputState = InputState.Command;
417
418 function handleKey(event: any) {
419 if (event.target.tagName === "INPUT") {
420 if (event.target.id === "taskName") {
421 if (event.key == "Enter") return browserUI.addTask(event);
422 if (event.key == "Escape") return browserUI.returnFocusAfterInput();
423 } else if (event.target.classList.contains("tag")) {
424 if (event.key == "Enter") return browserUI.completeTagEdit(event);
425 if (event.key == "Escape") return browserUI.completeTagEdit(event, CommitOrAbort.Abort);
426 } else {
427 if (event.key == "Enter") return browserUI.completeEdit(event);
428 if (event.key == "Escape") return browserUI.completeEdit(event, CommitOrAbort.Abort);
429 }
430 } else {
431 if (inputState === InputState.Command) {
432 if (event.key == "j") return browserUI.moveCursor(1);
433 if (event.key == "k") return browserUI.moveCursor(-1);
434 if (event.key == "J") return browserUI.moveTask(1);
435 if (event.key == "K") return browserUI.moveTask(-1);
436 if (event.key == "n") return browserUI.focusTaskNameInput(event);
437 if (event.key == "c") return browserUI.setState("cancelled");
438 if (event.key == "d") return browserUI.setState("done");
439 if (event.key == "q") return browserUI.setState("todo");
440 if (event.key == "s") return browserUI.setState("someday-maybe");
441 if (event.key == "w") return browserUI.setState("waiting");
442 if (event.key == "X") return browserUI.setState("deleted");
443 if (event.key == "u") return browserUI.undo();
444 if (event.key == "e") return browserUI.beginEdit(event);
445 if (event.key == "t") return browserUI.beginTagEdit(event);
446 if (event.key == "v") return (inputState = InputState.View);
447 } else if (inputState === InputState.View) {
448 inputState = InputState.Command;
449 if (event.key == "c") return browserUI.setView("cancelled");
450 if (event.key == "d") return browserUI.setView("done");
451 if (event.key == "q") return browserUI.setView("todo");
452 if (event.key == "s") return browserUI.setView("someday-maybe");
453 if (event.key == "w") return browserUI.setView("waiting");
454 if (event.key == "x") return browserUI.setView("deleted");
455 }
456 }
457 }
458
459 function browserInit() {
460 document.body.addEventListener("keydown", handleKey, { capture: false });
461 log.replay();
462 browserUI.firstVisibleTask()?.focus();
463 }