tiddlywiki/bin/optimise-svgs.js

a non-linear personal web notebook

#!/usr/bin/env node

/*
Optimise the SVGs in ./core/images using SVGO from https://github.com/svg/svgo

Install SVGO with the following command in the root of the repo:

npm install svgo@2.3.0
*/

"use strict";

var fs = require("fs"),
	path = require("path"),
	{ optimize } = require("svgo"),
	config = {
		plugins: [
			"cleanupAttrs",
			"removeDoctype",
			"removeXMLProcInst",
			"removeComments",
			"removeMetadata",
			"removeTitle",
			"removeDesc",
			"removeUselessDefs",
			"removeEditorsNSData",
			"removeEmptyAttrs",
			"removeHiddenElems",
			"removeEmptyText",
			"removeEmptyContainers",
			// 'removeViewBox',
			"cleanupEnableBackground",
			"convertStyleToAttrs",
			"convertColors",
			"convertPathData",
			"convertTransform",
			"removeUnknownsAndDefaults",
			"removeNonInheritableGroupAttrs",
			"removeUselessStrokeAndFill",
			"removeUnusedNS",
			"cleanupIDs",
			"cleanupNumericValues",
			"moveElemsAttrsToGroup",
			"moveGroupAttrsToElems",
			"collapseGroups",
			// 'removeRasterImages',
			"mergePaths",
			"convertShapeToPath",
			"sortAttrs",
			//'removeDimensions',
			{name: "removeAttrs", params: { attrs: "(stroke|fill)" } }
		]
	};

var basepath = "./core/images/",
	files = fs.readdirSync(basepath).sort();

files.forEach(function(filename) {
	if(filename.slice(-4) === ".tid") {
		var filepath = path.resolve(basepath,filename),
			data = fs.readFileSync(filepath,"utf8"),
			lines = data.split("\n"),
			blankLine = lines.indexOf(""),
			header = lines.slice(0,blankLine),
			body = lines.slice(blankLine + 1),
			fakeSVG = body.join("\n");
		// A hack to make the new-journal-button work
		fakeSVG = fakeSVG.replace("<<now \"DD\">>","&lt;&lt;now &quot;DD&quot;&gt;&gt;");
		config.path = filepath;
		var result = optimize(fakeSVG,config);
		if(result) {
			var newSVG = header.join("\n") + "\n\n" + result.data.replace("&lt;&lt;now &quot;DD&quot;&gt;&gt;","<<now \"DD\">>");
			fs.writeFileSync(filepath,newSVG);
		} else {
			console.log("Error " + err + " with " + filename);
			process.exit();
		};
	}
});