Use ydiff instead of just diff for prettier output

Author: joshuacwnewton

.github/workflows/compare_script_to_course.yml

@@ -11,7 +11,9 @@ on:
 
 jobs:
   compare:
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
+    env:
+      YDIFF_OPTIONS: "--side-by-side --pager=cat --color=always --width=120 --nowrap"
 
     steps:
       - name: Check out repo
@@ -22,6 +24,9 @@ jobs:
         with:
           python-version: "3.11"
 
+      - name: Install `ydiff`  # https://github.com/ymattw/ydiff
+        run: brew install ydiff
+
       - name: Download remote text file
         run: |
           curl -L https://gist.githubusercontent.com/joshuacwnewton/3c554bf27111cf0020e5c124b66448c4/raw/ff08cbcf7738941008eca0fa54e024d98eea24e8/gistfile1.txt -o remote.txt
@@ -43,7 +48,8 @@ jobs:
       - name: Diff commands
         run: |
           echo "🔍 Diffing remote vs local..."
-          diff -u local_cmds_sorted.txt remote_cmds_sorted.txt || true
+          diff -u local_cmds_sorted.txt remote_cmds_sorted.txt > diff.txt || true
+          ydiff < $DIFF_FILE
 
       - name: Upload results as artifacts
         uses: actions/upload-artifact@v4