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html/gulpfile.js

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+const { src, dest, task, series } = require('gulp');
+const clean = require('gulp-clean');
+const gzip = require('gulp-gzip');
+const inlineSource = require('gulp-inline-source');
+const rename = require('gulp-rename');
+const through2 = require('through2');
+
+const genHeader = (size, buf, len) => {
+    let idx = 0;
+    let data = 'unsigned char index_html[] = {\n  ';
+
+    for (const value of buf) {
+        idx++;
+
+        const current = value < 0 ? value + 256 : value;
+
+        data += '0x';
+        data += (current >>> 4).toString(16);
+        data += (current & 0xf).toString(16);
+
+        if (idx === len) {
+            data += '\n';
+        } else {
+            data += idx % 12 === 0 ? ',\n  ' : ', ';
+        }
+    }
+
+    data += '};\n';
+    data += `unsigned int index_html_len = ${len};\n`;
+    data += `unsigned int index_html_size = ${size};\n`;
+    return data;
+};
+let fileSize = 0;
+
+task('clean', () => {
+    return src('dist', { read: false, allowEmpty: true }).pipe(clean());
+});
+
+task('inline', () => {
+    const options = {
+        compress: false,
+    };
+
+    return src('dist/index.html').pipe(inlineSource(options)).pipe(rename('inline.html')).pipe(dest('dist/'));
+});
+
+task(
+    'default',
+    series('inline', () => {
+        return src('dist/inline.html')
+            .pipe(
+                through2.obj((file, enc, cb) => {
+                    fileSize = file.contents.length;
+                    return cb(null, file);
+                })
+            )
+            .pipe(gzip())
+            .pipe(
+                through2.obj((file, enc, cb) => {
+                    const buf = file.contents;
+                    file.contents = Buffer.from(genHeader(fileSize, buf, buf.length));
+                    return cb(null, file);
+                })
+            )
+            .pipe(rename('html.h'))
+            .pipe(dest('../src/'));
+    })
+);