From b17de9ce03be7c34e576158ca5252aa9c2322a56 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Benedikt=20Gro=C3=9F?= <bg@benedikt-gross.de>
Date: Mon, 7 Oct 2024 16:47:11 +0200
Subject: [PATCH] Create mirror-svg.js

---
 helpers/mirror-svg.js | 69 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 helpers/mirror-svg.js

diff --git a/helpers/mirror-svg.js b/helpers/mirror-svg.js
new file mode 100644
index 000000000..992feefb6
--- /dev/null
+++ b/helpers/mirror-svg.js
@@ -0,0 +1,69 @@
+const fs = require('fs');
+const path = require('path');
+const { JSDOM } = require('jsdom');
+
+
+function mirrorSVGHorizontally(svgContent) {
+  const dom = new JSDOM(svgContent, { contentType: "image/svg+xml" });
+  const document = dom.window.document;
+  const svg = document.querySelector('svg');
+  const viewBox = svg.getAttribute('viewBox');
+
+  if (!viewBox) {
+    throw new Error("SVG file must have a viewBox attribute.");
+  }
+
+  const [minX, minY, viewBoxWidth, viewBoxHeight] = viewBox.split(' ').map(Number);
+
+  if (isNaN(viewBoxWidth) || isNaN(viewBoxHeight)) {
+    throw new Error("Invalid viewBox dimensions.");
+  }
+
+  const topLevelGroups = svg.querySelectorAll('svg > g');
+
+  topLevelGroups.forEach((g) => {
+    if (g.getAttribute('id') !== 'grid') {
+      const currentTransform = g.getAttribute('transform') || '';
+      const newTransform = `${currentTransform} scale(-1, 1) translate(-${viewBoxWidth + minX}, 0)`;
+      g.setAttribute('transform', newTransform);
+    }
+  });
+
+  return dom.serialize();
+}
+
+function main() {
+  const args = process.argv.slice(2);
+
+  if (args.length < 2) {
+    console.info('Usage: node mirror-svg.js path/to/source.svg path/to/result.svg');
+    process.exit(1);
+  }
+
+  const sourcePath = args[0];
+  const resultPath = args[1];
+
+  fs.readFile(sourcePath, 'utf8', (err, data) => {
+    if (err) {
+      console.error(`Error reading file: ${err.message}`);
+      process.exit(1);
+    }
+
+    try {
+      const mirroredSVG = mirrorSVGHorizontally(data);
+
+      fs.writeFile(resultPath, mirroredSVG, 'utf8', (err) => {
+        if (err) {
+          console.error(`Error writing file: ${err.message}`);
+          process.exit(1);
+        }
+        console.log(`Horizontally mirrored SVG saved to ${resultPath}`);
+      });
+    } catch (error) {
+      console.error(`Error processing SVG: ${error.message}`);
+      process.exit(1);
+    }
+  });
+}
+
+main();