[web-client] simple theme: vite plugins plg_svg2png & plg_svg2svg

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

client/simple/tools/img.js

@@ -0,0 +1,78 @@
+import fs from "fs";
+import path from "path";
+import sharp from "sharp";
+import { optimize as svgo } from "svgo";
+
+/**
+ * @typedef {object} Src2Dest - Mapping of src to dest
+ * @property {string} src - Name of the source file.
+ * @property {string} dest - Name of the destination file.
+ */
+
+
+/**
+ * Convert a list of SVG files to PNG.
+ *
+ * @param {Src2Dest[]} items - Array of SVG files (src: SVG, dest:PNG) to convert.
+ */
+
+async function svg2png (items) {
+  items.forEach(
+    async (item) => {
+      try {
+        fs.mkdir(path.dirname(item.dest), { recursive: true }, (err) => {
+          if (err)
+            throw err;
+        });
+
+        const info = await sharp(item.src).png({
+          force: true,
+          compressionLevel: 9,
+          palette: true,
+        }).toFile(item.dest);
+
+        console.log(
+          `[svg2png] created ${item.dest} -- bytes: ${info.size}, w:${info.width}px,  h:${info.height}px`
+        );
+      } catch (err) {
+        console.error(`ERROR: ${item.dest} -- ${err}`);
+        throw(err);
+      }
+    }
+  );
+}
+
+
+/**
+ * Optimize SVG images for WEB.
+ *
+ * @param {import('svgo').Config} svgo_opts - Options passed to svgo.
+ * @param {Src2Dest[]} items - Array of SVG files (src:SVG, dest:SVG) to optimize.
+ */
+
+async function svg2svg(svgo_opts, items) {
+  items.forEach(
+    async (item) => {
+      try {
+        fs.mkdir(path.dirname(item.dest), { recursive: true }, (err) => {
+          if (err)
+            throw err;
+        });
+
+        const raw = fs.readFileSync(item.src, "utf8");
+        const opt = svgo(raw, svgo_opts);
+        fs.writeFileSync(item.dest, opt.data);
+        console.log(
+          `[svg2svg] optimized: ${item.dest} -- src: ${item.src}`
+        );
+
+      } catch (err) {
+        console.error(`ERROR: optimize src: ${item.src} -- ${err}`);
+        throw(err);
+      }
+    }
+  );
+}
+
+
+export { svg2png, svg2svg };

client/simple/tools/plg.js

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+/**
+ * Custom vite plugins to build the web-client components of the simple theme.
+ *
+ * HINT:
+ *
+ *   This is an inital implementation for the migration of the build process
+ *   from grunt to vite.  For fully support (vite: build & serve) more work is
+ *   needed.
+ */
+
+import { svg2png } from "./img.js";
+import { svg2svg } from "./img.js";
+
+/**
+ * Vite plugin to convert a list of SVG files to PNG.
+ *
+ * @param {import('./img.js').Src2Dest} items - Array of SVG files (src: SVG, dest:PNG) to convert.
+ */
+function plg_svg2png(items) {
+  return {
+    name: 'searxng-simple-svg2png',
+    apply: 'build', // or 'serve'
+    async writeBundle() { svg2png(items); },
+  };
+}
+
+/**
+ * Vite plugin to optimize SVG images for WEB.
+ *
+ * @param {import('svgo').Config} svgo_opts - Options passed to svgo.
+ * @param {import('./img.js').Src2Dest} items - Array of SVG files (src:SVG, dest:SVG) to optimize.
+ */
+function plg_svg2svg(svgo_opts, items) {
+  return {
+    name: 'searxng-simple-svg2png',
+    apply: 'build', // or 'serve'
+    async writeBundle() { svg2svg(items, svgo_opts); },
+  };
+}
+
+export { plg_svg2png, plg_svg2svg };