Create build scripts (again)

.gitignore

@@ -1 +1,2 @@
 *.zip
+node_modules

README.md

@@ -7,7 +7,17 @@ license: public domain
 
 Install via NPM with `npm install https://github.com/xem/W/#semver:1.0.2`
 
-Build scripts are available on: https://github.com/xem/W/tree/sukus21 (thanks to @sukus21)
+## Building
+
+To build the project, first make sure to install the projects dependencies:
+```sh
+npm install
+```
+
+Then run the build script like shown below, and artifacts will appear in the `dist` folder:
+```sh
+npm run build
+```
 
 ## Release policy
 

build.mjs

@@ -0,0 +1,116 @@
+import { execFile } from 'node:child_process';
+import fs from "node:fs/promises";
+import { minify } from "terser";
+import ect from "ect-bin";
+
+// Current latest version
+const version = "1.0";
+
+// List of all available plugins and their names
+const availablePlugins = [
+    // Enables shader compilation logs
+    "debug",
+
+    // Enables code for calculation of smooth normals
+    "smooth",
+
+    // Enables the built-in shapes
+    "builtinShapes",
+];
+
+// Minifies any shader source code found in the src string
+function minifyFileShaders(src) {
+    for (const shaderOld of src.match(/"#version 300 es[^"]*"/g)) {
+        let shader = shaderOld;
+
+        // Remove comments and newlines
+        shader = shader.replace(/(\/\/.*?)?\\n/g, " ");
+
+        // Remove any unneeded whitespace
+        // Run these twice, to catch one-width character sequences
+        for (let i = 0; i < 2; i++) {
+            shader = shader.
+                replace(/([\w\.])\s+([\w\.])/g, "$1 $2").
+                replace(/([\w\.])\s+([^\w\.])/g, "$1$2").
+                replace(/([^\w\.])\s+([\w\.])/g, "$1$2").
+                replace(/([^\w\.])\s+([^\w\.])/g, "$1$2");
+        }
+
+        // Re-add newline after #version directive
+        shader = shader.replace(/(#version 300 es)\s+/, "$1\\n");
+
+        // Finally, replace shader source with new minified version
+        src = src.replace(shaderOld, shader);
+    }
+
+    // Return modified js source
+    return src;
+}
+
+// Main build function
+async function buildW(editionName, plugins = []) {
+
+    // Build output filenames
+    const outFnameJs = `./dist/w.${editionName}.min.js`;
+    const outFnameZip = `./dist/w.${editionName}.min.zip`;
+    const outFnameVersionedJs = `./dist/w${version}.${editionName}.min.js`;
+
+    // Add plugin states to a map
+    const pluginsObj = {};
+    for (const pluginName of availablePlugins) {
+        pluginsObj[`W.plugin.${pluginName}`] = plugins.includes(pluginName);
+    }
+
+    // Read W source file
+    const wSrc = (await fs.readFile("./src/w.js")).toString();
+
+    // Run terser with provided flags
+    const tersed = await minify(wSrc, {
+        mangle: true,
+        compress: {
+            passes: 2,
+            global_defs: {
+                "W.built": true,
+                ...pluginsObj,
+            },
+        },
+    });
+
+    // Minify any shaders hanging about
+    const code = minifyFileShaders(tersed.code);
+
+    // Write .js file to file system
+    await fs.writeFile(outFnameJs, code);
+    await fs.writeFile(outFnameVersionedJs, code);
+
+    // Remove existing .zip, to avoid ect throwing errors
+    try {
+        await fs.unlink(outFnameZip);
+    } catch (err) {
+    }
+
+    // Put the .js file into a .zip using ect
+    await new Promise((resolve, reject) => {
+        execFile(ect, ["-9", "-strip", "-zip", outFnameZip, outFnameJs], (err, stdout) => {
+            if (err) reject(stdout);
+            else resolve();
+        });
+    })
+}
+
+// Define plugins for the different versions
+const versionConfigs = {
+    "full": ["smooth", "builtinShapes"],
+    "lite": [],
+};
+
+// Build the different versions
+for (const [edition, plugins] of Object.entries(versionConfigs)) {
+    await buildW(edition, plugins);
+}
+
+// Print file sizes
+console.log(`w.full.min.js:  ${(await fs.stat("./dist/w.full.min.js")).size} bytes`);
+console.log(`w.lite.min.js:  ${(await fs.stat("./dist/w.lite.min.js")).size} bytes`);
+console.log(`w.full.min.zip: ${(await fs.stat("./dist/w.full.min.zip")).size} bytes`);
+console.log(`w.lite.min.zip: ${(await fs.stat("./dist/w.lite.min.zip")).size} bytes`);