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wuLib.js
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wuLib.js
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const fs = require("fs");
const path = require("path");
const os = require('os');
let platform = os.platform();
class CntEvent {
constructor() {
this.cnt = 0;
this.emptyEvent = [];
this.encount = this.encount.bind(this);
this.decount = this.decount.bind(this);
this.add = this.add.bind(this);
}
encount(delta = 1) {
this.cnt += delta;
}
decount() {
if (this.cnt > 0) --this.cnt;
if (this.cnt == 0) {
for (let info of this.emptyEvent) info[0](...info[1]);
this.emptyEvent = [];
}
}
add(cb, ...attach) {
this.emptyEvent.push([cb, attach]);
}
check(cb, ...attach) {
if (this.cnt == 0) cb(...attach);
else this.add(cb, ...attach);
}
}
class LimitedRunner {
constructor(limit) {
this.limit = limit;
this.cnt = 0;
this.funcs = [];
}
run(func) {
if (this.cnt < this.limit) {
this.cnt++;
setTimeout(func, 0);
} else {
this.funcs.push(func);
}
}
done() {
if (this.cnt > 0) this.cnt--;
if (this.funcs.length > 0) {
this.cnt++;
setTimeout(this.funcs.shift(), 0);
}
}
runWithCb(func, ...args) {
let cb = args.pop(), self = this;
function agent(...args) {
self.done();
return cb.apply(this, args);
}
args.push(agent);
this.run(() => func(...args));
}
}
let ioEvent = new CntEvent;
let ioLimit = new LimitedRunner(4096);
function mkdirs(dir, cb) {
ioLimit.runWithCb(fs.stat.bind(fs), dir, (err, stats) => {
if (err) mkdirs(path.dirname(dir), () => fs.mkdir(dir, cb));
else if (stats.isFile()) throw Error(dir + " was created as a file, so we cannot put file into it.");
else cb();
});
}
function save(name, content) {
ioEvent.encount();
mkdirs(path.dirname(name), () => ioLimit.runWithCb(fs.writeFile.bind(fs), name, content, err => {
if (err) {
if (platform.indexOf('win') != -1) {
console.log('Save file error: ' + err);
} else {
throw Error('Save file error: ' + err);
}
}
ioEvent.decount();
}));
}
function get(name, cb, opt = {encoding: 'utf8'}) {
ioEvent.encount();
ioLimit.runWithCb(fs.readFile.bind(fs), name, opt, (err, data) => {
if (err) throw Error("Read file error: " + err);
else cb(data);
ioEvent.decount();
});
}
function del(name) {
ioEvent.encount();
ioLimit.runWithCb(fs.unlink.bind(fs), name, ioEvent.decount);
}
function changeExt(name, ext = "") {
return name.slice(0, name.lastIndexOf(".")) + ext;
}
function scanDirByExt(dir, ext, cb) {
let result = [], scanEvent = new CntEvent;
function helper(dir) {
scanEvent.encount();
ioLimit.runWithCb(fs.readdir.bind(fs), dir, (err, files) => {
if (err) throw Error("Scan dir error: " + err);
for (let file of files) {
scanEvent.encount();
let name = path.resolve(dir, file);
fs.stat(name, (err, stats) => {
if (err) throw Error("Scan dir error: " + err);
if (stats.isDirectory()) helper(name);
else if (stats.isFile() && name.endsWith(ext)) result.push(name);
scanEvent.decount();
});
}
scanEvent.decount();
});
}
scanEvent.add(cb, result);
helper(dir, ext, scanEvent);
}
function toDir(to, from) {//get relative path without posix/win32 problem
if (from[0] == ".") from = from.slice(1);
if (to[0] == ".") to = to.slice(1);
from = from.replace(/\\/g, '/');
to = to.replace(/\\/g, '/');
let a = Math.min(to.length, from.length);
for (let i = 1, m = Math.min(to.length, from.length); i <= m; i++) if (!to.startsWith(from.slice(0, i))) {
a = i - 1;
break;
}
let pub = from.slice(0, a);
let len = pub.lastIndexOf("/") + 1;
let k = from.slice(len);
let ret = "";
for (let i = 0; i < k.length; i++) if (k[i] == '/') ret += '../';
return ret + to.slice(len);
}
function commonDir(pathA, pathB) {
if (pathA[0] == ".") pathA = pathA.slice(1);
if (pathB[0] == ".") pathB = pathB.slice(1);
pathA = pathA.replace(/\\/g, '/');
pathB = pathB.replace(/\\/g, '/');
let a = Math.min(pathA.length, pathB.length);
for (let i = 1, m = Math.min(pathA.length, pathB.length); i <= m; i++) if (!pathA.startsWith(pathB.slice(0, i))) {
a = i - 1;
break;
}
let pub = pathB.slice(0, a);
let len = pub.lastIndexOf("/") + 1;
return pathA.slice(0, len);
}
function commandExecute(cb, helper) {
console.time("Total use");
function endTime() {
ioEvent.check(() => console.timeEnd("Total use"));
}
let orders = [];
for (let order of process.argv) if (order.startsWith("-")) orders.push(order.slice(1));
let iter = process.argv[Symbol.iterator](), nxt = iter.next(), called = false, faster = orders.includes("f"),
fastCnt;
if (faster) {
fastCnt = new CntEvent;
fastCnt.add(endTime);
}
function doNext() {
let nxt = iter.next();
while (!nxt.done && nxt.value.startsWith("-")) nxt = iter.next();
if (nxt.done) {
if (!called) console.log("Command Line Helper:\n\n" + helper);
else if (!faster) endTime();
} else {
called = true;
if (faster) fastCnt.encount(), cb(nxt.value, fastCnt.decount, orders), doNext();
else cb(nxt.value, doNext, orders);
}
}
while (!nxt.done && !nxt.value.endsWith(".js")) nxt = iter.next();
doNext();
}
module.exports = {
mkdirs: mkdirs, get: get, save: save, toDir: toDir, del: del, addIO: ioEvent.add,
changeExt: changeExt, CntEvent: CntEvent, scanDirByExt: scanDirByExt, commonDir: commonDir,
commandExecute: commandExecute
};