Merge pull request #305 from padjal/copyright

Add copyright protection

steps/lint.sh

@@ -52,3 +52,20 @@ fi
 bibcop tex/report.bib
 
 find "${LOCAL}" -name '*.sh' -type f -print0 | xargs -0 -n1 shellcheck --shell=bash --severity=style
+
+header="Copyright (c) 2021-$(date +%Y) Yegor Bugayenko"
+
+copyright_check="false"
+
+# Iterate over each file in the directory recursively
+while IFS= read -r file; do
+    # Search for the pattern in the file
+    if ! grep -q "$header" "$file"; then
+        copyright_check="true"
+        echo "⚠️  Copyright not found in file: $file"
+    fi
+done < <(find "$LOCAL" -type f \( -name "*.sh" -o -name "*.py" -o -name "*.rb" \))
+
+if [[ "${copyright_check}" = "true" ]]; then
+  exit 1
+fi