Added ffmpeg progress bar via fluent-ffmpeg and progress libs (#57)

* Add fluent-ffmpeg back and cross-platform progress bar

* Repo clean up

Move ts files to src, build and output js files to build folder

* Do not print messages when exit code is 0

this is triggered by signal events

Co-authored-by: kylon <kylonux@gmail.com>

src/utils.ts

@@ -0,0 +1,83 @@
+import { execSync } from 'child_process';
+import colors from 'colors';
+import fs from 'fs';
+import path from 'path';
+
+
+function sanitizeUrls(urls: string[]) {
+    const rex = new RegExp(/(?:https:\/\/)?.*\/video\/[a-z0-9]{8}-(?:[a-z0-9]{4}\-){3}[a-z0-9]{12}$/, 'i');
+    const sanitized: string[] = [];
+
+    for (let i=0, l=urls.length; i<l; ++i) {
+        const urlAr = urls[i].split('?');
+        const query = urlAr.length === 2 && urlAr[1] !== '' ? '?'+urlAr[1] : '';
+        let url = urlAr[0];
+
+        if (!rex.test(url)) {
+            if (url !== '')
+                console.warn(colors.yellow('Invalid URL at line ' + (i+1) + ', skip..'));
+
+            continue;
+        }
+
+        if (url.substring(0, 8) !== 'https://')
+            url = 'https://'+url;
+
+        sanitized.push(url+query);
+    }
+
+    return sanitized.length ? sanitized : null;
+}
+
+
+export function parseVideoUrls(videoUrls: any) {
+    const t = videoUrls[0] as string;
+    const isPath = t.substring(t.length-4) === '.txt';
+    let urls: string[];
+
+    if (isPath)
+        urls = fs.readFileSync(t).toString('utf-8').split(/[\r\n]/);
+    else
+        urls = videoUrls as string[];
+
+    return sanitizeUrls(urls);
+}
+
+
+export function sleep(ms: number) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+
+export function checkRequirements() {
+    try {
+        const ffmpegVer = execSync('ffmpeg -version').toString().split('\n')[0];
+        console.info(colors.green(`Using ${ffmpegVer}\n`));
+
+    } catch (e) {
+        return null;
+    }
+
+    return true;
+}
+
+
+export function makeUniqueTitle(title: string, outDir: string) {
+    let ntitle = title;
+    let k = 0;
+
+    while (fs.existsSync(outDir + path.sep + ntitle + '.mp4'))
+        ntitle = title + ' - ' + (++k).toString();
+
+    return ntitle;
+}
+
+
+export function ffmpegTimemarkToChunk(timemark: string) {
+    const timeVals: string[] = timemark.split(':');
+    const hrs = parseInt(timeVals[0]);
+    const mins = parseInt(timeVals[1]);
+    const secs = parseInt(timeVals[2]);
+
+    return hrs * 1000 + mins * 100 + secs;
+}