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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++;
let 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', () => {
return src('dist/index.html')
.pipe(inlineSource())
.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/'));
}));
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