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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 === 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 }