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const gulp = require('gulp'),
glob = require("glob"),
fs = require("fs"),
path = require("path"),
svg2img = require('svg2img');
gulp.task('icons-sprite', function (cb) {
const columnsCount = 10,
padding = 24,
paddingOuter = 49,
iconSize = 48;
glob("_site/icons/*.svg", {}, function (er, files) {
const iconsCount = files.length,
rowsCount = Math.ceil(iconsCount / columnsCount),
width = columnsCount * (iconSize + padding) + 2 * paddingOuter - padding,
height = rowsCount * (iconSize + padding) + 2 * paddingOuter - padding;
let svgContentSymbols = '',
svgContentIcons = '',
x = paddingOuter,
y = paddingOuter;
files.forEach(function (file, i) {
let name = path.basename(file, '.svg');
let svgFile = fs.readFileSync(file),
svgFileContent = svgFile.toString();
svgFileContent = svgFileContent
.replace('<svg xmlns="http://www.w3.org/2000/svg"', `<symbol id="${name}"`)
.replace(' width="24" height="24"', '')
.replace('</svg>', '</symbol>')
.replace(/\n\s+/g, '');
svgContentSymbols += `\t${svgFileContent}\n`;
svgContentIcons += `\t<use xlink:href="#${name}" x="${x}" y="${y}" width="${iconSize}" height="${iconSize}" />\n`;
x += padding + iconSize;
if (i % columnsCount === columnsCount - 1) {
x = paddingOuter;
y += padding + iconSize;
}
});
const svgContent = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 ${width} ${height}" width="${width}" height="${height}"><rect x="0" y="0" width="${width}" height="${height}" fill="#fafafa"></rect>\n${svgContentSymbols}\n${svgContentIcons}\n</svg>`;
fs.writeFileSync('icons.svg', svgContent);
cb();
});
});
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