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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", `${priority}`);
89 for (const task of document.getElementsByClassName("task")) {
90 if (task !== target && this.getPriority(task) > priority) {
91 task.parentElement!.insertBefore(target, task);
92 return target;
93 }
94 }
95 document.getElementById("tasks")!.appendChild(target);
96 return target;
97 },
98
99 setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
100 const task = this.getTask(createTimestamp);
101 if (task) {
102 task.setAttribute("data-state", state);
103 if (task instanceof HTMLElement) {
104 task.style.display = state == "todo" ? "block" : "none"; // Until view filtering
105 }
106 }
107 },
108 };
109
110 function Log(prefix: string = "vp-") {
111 var next_log_index = 0;
112 return {
113 apply: function (entry: string) {
114 const [timestamp, command, data] = splitN(entry, " ", 2);
115 if (command == "Create") {
116 return Model.addTask(timestamp, data);
117 }
118 if (command == "Edit") {
119 const [createTimestamp, description] = splitN(data, " ", 1);
120 return Model.edit(createTimestamp, description);
121 }
122 if (command == "State") {
123 const [createTimestamp, state] = splitN(data, " ", 1);
124 return Model.setState(timestamp, createTimestamp, state);
125 }
126 if (command == "Priority") {
127 const [createTimestamp, newPriority] = splitN(data, " ", 1);
128 return Model.setPriority(createTimestamp, parseFloat(newPriority));
129 }
130 },
131
132 record: function (entry: string) {
133 window.localStorage.setItem(`${prefix}${next_log_index++}`, entry);
134 },
135
136 recordAndApply: function (entry: string) {
137 this.record(entry);
138 return this.apply(entry);
139 },
140
141 replay: function () {
142 while (true) {
143 const entry = window.localStorage.getItem(`${prefix}${next_log_index}`);
144 if (entry === null) {
145 break;
146 }
147 this.apply(entry);
148 next_log_index++;
149 }
150 },
151 };
152 }
153 const log = Log();
154
155 const undoLog: string[] = [];
156
157 const UI = {
158 addTask: function (description: string): Element {
159 const now = clock.now();
160 undoLog.push(`State ${now} deleted`);
161 return <Element>log.recordAndApply(`${now} Create ${description}`);
162 },
163 edit: function (createTimestamp: string, newDescription: string, oldDescription: string) {
164 undoLog.push(`Edit ${createTimestamp} ${oldDescription}`);
165 return log.recordAndApply(`${clock.now()} Edit ${createTimestamp} ${newDescription}`);
166 },
167 setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
168 undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
169 return log.recordAndApply(`${clock.now()} Priority ${createTimestamp} ${newPriority}`);
170 },
171 setState: function (createTimestamp: string, newState: string, oldState: string) {
172 undoLog.push(`State ${createTimestamp} ${oldState}`);
173 return log.recordAndApply(`${clock.now()} State ${createTimestamp} ${newState}`);
174 },
175 undo: function () {
176 if (undoLog.length > 0) {
177 return log.recordAndApply(`${clock.now()} ${undoLog.pop()}`);
178 }
179 },
180 };
181
182 const BrowserUI = {
183 addTask: function (event: KeyboardEvent) {
184 const input = <HTMLInputElement>document.getElementById("taskName");
185 if (input.value) {
186 const task = UI.addTask(input.value);
187 if (task && task instanceof HTMLElement) task.focus();
188 input.value = "";
189 if (event.getModifierState("Control")) {
190 this.setPriority(task, null, document.getElementsByClassName("task")[0]);
191 }
192 }
193 },
194
195 beginEdit: function (event: Event) {
196 const task = document.activeElement;
197 if (!task) return;
198 const input = document.createElement("input");
199 const oldDescription = task.textContent!;
200 task.setAttribute("data-description", oldDescription);
201 input.value = oldDescription;
202 input.addEventListener("blur", BrowserUI.completeEdit, { once: true });
203 task.textContent = "";
204 task.appendChild(input);
205 input.focus();
206 input.select();
207 event.preventDefault();
208 },
209
210 completeEdit: function (event: Event) {
211 const input = event.target as HTMLInputElement;
212 const task = input.parentElement!;
213 const oldDescription = task.getAttribute("data-description")!;
214 const newDescription = input.value;
215 input.removeEventListener("blur", BrowserUI.completeEdit);
216 task.removeChild(task.children[0]);
217 task.removeAttribute("data-description");
218 task.focus();
219 if (newDescription === oldDescription) {
220 task.textContent = oldDescription;
221 } else {
222 UI.edit(task.getAttribute("data-created")!, newDescription, oldDescription);
223 }
224 },
225
226 firstVisibleTask: function () {
227 for (const task of document.getElementsByClassName("task")) {
228 if (task instanceof HTMLElement && task.style.display !== "none") {
229 return task;
230 }
231 }
232 },
233
234 focusTaskNameInput: function (event: Event) {
235 document.getElementById("taskName")!.focus();
236 event.preventDefault();
237 },
238
239 visibleTaskAtOffset(task: Element, offset: number): Element {
240 var cursor: Element | null = task;
241 var valid_cursor = cursor;
242 const increment = offset / Math.abs(offset);
243 while (true) {
244 cursor = increment > 0 ? cursor.nextElementSibling : cursor.previousElementSibling;
245 if (!cursor || !(cursor instanceof HTMLElement)) break;
246 if (cursor.style.display !== "none") {
247 offset -= increment;
248 valid_cursor = cursor;
249 }
250 if (Math.abs(offset) < 0.5) break;
251 }
252 return valid_cursor;
253 },
254
255 moveCursor: function (offset: number): boolean {
256 const active = document.activeElement;
257 if (!active) return false;
258 const dest = this.visibleTaskAtOffset(active, offset);
259 if (dest !== active && dest instanceof HTMLElement) {
260 dest.focus();
261 return true;
262 }
263 return false;
264 },
265
266 moveTask: function (offset: number) {
267 const active = document.activeElement;
268 if (!active) return;
269 const dest = this.visibleTaskAtOffset(active, offset);
270 if (dest === active) return; // Already extremal
271 var onePastDest: Element | null = this.visibleTaskAtOffset(dest, offset / Math.abs(offset));
272 if (onePastDest == dest) onePastDest = null; // Will become extremal
273 if (offset > 0) {
274 this.setPriority(active, dest, onePastDest);
275 } else {
276 this.setPriority(active, onePastDest, dest);
277 }
278 },
279
280 // Change task's priority to be between other tasks a and b.
281 setPriority: function (task: Element, a: Element | null, b: Element | null) {
282 const aPriority = a === null ? 0 : Model.getPriority(a);
283 const bPriority = b === null ? clock.now() : Model.getPriority(b);
284 console.assert(aPriority < bPriority, aPriority, "<", bPriority);
285 const span = bPriority - aPriority;
286 const newPriority = aPriority + 0.1 * span + 0.8 * span * Math.random();
287 console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
288 const newPriorityRounded = Math.round(newPriority);
289 const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
290 UI.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
291 task instanceof HTMLElement && task.focus();
292 },
293
294 setState: function (newState: string) {
295 const task = document.activeElement;
296 if (!task) return;
297 const oldState = task.getAttribute("data-state");
298 if (newState === oldState) return;
299 const createTimestamp = task.getAttribute("data-created")!;
300 this.moveCursor(1) || this.moveCursor(-1);
301 return UI.setState(createTimestamp, newState, oldState);
302 },
303
304 undo: function () {
305 const ret = UI.undo();
306 if (ret && ret instanceof HTMLElement) ret.focus();
307 },
308 };
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 }