Lint frontmatter (#5218)

lint/encoding.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+check_encoding() {
+    file="$1"
+    encoding=$(file -b --mime-encoding "$file")
+
+    # Check if the encoding is neither UTF-8 nor US-ASCII
+    if [[ "$encoding" != "utf-8" && "$encoding" != "us-ascii" ]]; then
+        # Print the file path and encoding
+        echo "Error: $file has encoding $encoding, which is not utf-8 or us-ascii"
+        return 1
+    fi
+
+    # Check for UTF-8 BOM
+    if [[ "$encoding" == "utf-8" ]]; then
+        if head -c 3 "$file" | cmp -s <(echo -ne '\xEF\xBB\xBF'); then
+            echo "Error: $file contains a UTF-8 BOM"
+            return 1
+        fi
+    fi
+
+    return 0
+}
+
+export -f check_encoding
+
+# Default to current directory if no argument is given
+directory="${1:-.}"
+
+find "$directory" -type f -name "*.md" -print0 | xargs -0 -P 8 -I {} bash -c 'check_encoding "$@"' _ {}