From bc3a3f73162c282b18bbf7075ad6b95d12766d93 Mon Sep 17 00:00:00 2001
From: Noah Pendleton <2538614+noahp@users.noreply.github.com>
Date: Thu, 10 Aug 2023 15:12:23 -0400
Subject: [PATCH] Add github action to check for redirects on rename

---
 .github/workflows/detect-renamed-posts.js     | 32 +++++++++++++++++++
 .github/workflows/detect-renamed-posts.yml    | 22 +++++++++++++
 ...v.md => 2023-08-09-a-modern-c-devl-env.md} |  0
 3 files changed, 54 insertions(+)
 create mode 100644 .github/workflows/detect-renamed-posts.js
 create mode 100644 .github/workflows/detect-renamed-posts.yml
 rename _posts/{2023-08-09-a-modern-c-dev-env.md => 2023-08-09-a-modern-c-devl-env.md} (100%)

diff --git a/.github/workflows/detect-renamed-posts.js b/.github/workflows/detect-renamed-posts.js
new file mode 100644
index 000000000..89871d3d4
--- /dev/null
+++ b/.github/workflows/detect-renamed-posts.js
@@ -0,0 +1,32 @@
+const fs = require('fs');
+const path = require('path');
+
+const redirectsFilePath = path.join(__dirname, '_redirects');
+const postsDirectory = path.join(__dirname, '_posts');
+
+function updateRedirects(originalName, newName) {
+  const redirects = fs.readFileSync(redirectsFilePath, 'utf-8');
+  const lines = redirects.split('\n');
+
+  const newRedirect = `/blog/${originalName} /blog/${newName}`;
+  const updatedRedirects = lines.map(line => {
+    if (line.trim() === newRedirect.trim()) {
+      return newRedirect;
+    }
+    return line;
+  }).join('\n');
+
+  fs.writeFileSync(redirectsFilePath, updatedRedirects, 'utf-8');
+}
+
+const changedFiles = JSON.parse(process.env.GITHUB_EVENT_PATH).commits[0].added.concat(
+  JSON.parse(process.env.GITHUB_EVENT_PATH).commits[0].modified
+);
+
+changedFiles.forEach(file => {
+  if (file.startsWith('_posts/')) {
+    const originalName = path.basename(file, path.extname(file));
+    const newName = path.basename(file, path.extname(file)).replace(/^\d{4}-\d{2}-\d{2}-/, '');
+    updateRedirects(originalName, newName);
+  }
+});
diff --git a/.github/workflows/detect-renamed-posts.yml b/.github/workflows/detect-renamed-posts.yml
new file mode 100644
index 000000000..c57f5d9f4
--- /dev/null
+++ b/.github/workflows/detect-renamed-posts.yml
@@ -0,0 +1,22 @@
+name: Detect Renamed Posts
+
+on:
+
+  pull_request:
+    branches: [master]
+    paths:
+      - '_posts/**'
+
+jobs:
+  detect_renamed_post:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+
+      - name: Set Up Node.js
+        uses: actions/setup-node@v2
+
+      - name: Run Renaming Script
+        run: node .github/workflows/detect-renamed-posts.js
diff --git a/_posts/2023-08-09-a-modern-c-dev-env.md b/_posts/2023-08-09-a-modern-c-devl-env.md
similarity index 100%
rename from _posts/2023-08-09-a-modern-c-dev-env.md
rename to _posts/2023-08-09-a-modern-c-devl-env.md