Add script to correct copyright notices in .go files

[ci skip]

Signed-off-by: Neil Twigg <[email protected]>

Author: neilalexander

scripts/updateCopyrights.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Ensure script is run at the root of a git repository
+git rev-parse --is-inside-work-tree &>/dev/null || { echo "Not inside a git repository"; exit 1; }
+
+# Find all .go files tracked by git
+git ls-files "*.go" | while read -r file; do
+    # Skip files that don't have a copyright belonging to "The NATS Authors"
+    current_copyright=$(grep -oE "^// Copyright [0-9]{4}(-[0-9]{4})? The NATS Authors" "$file" || echo "")
+    [[ -z "$current_copyright" ]] && continue
+
+    # Get the last commit year for the file
+    last_year=$(git log --follow --format="%ad" --date=format:%Y -- "$file" | head -1)
+    existing_years=$(echo "$current_copyright" | grep -oE "[0-9]{4}(-[0-9]{4})?")
+
+    # Determine the new copyright range
+    if [[ "$existing_years" =~ ^([0-9]{4})-([0-9]{4})$ ]]; then
+        first_year=${BASH_REMATCH[1]}
+        new_copyright="// Copyright $first_year-$last_year The NATS Authors"
+    elif [[ "$existing_years" =~ ^([0-9]{4})$ ]]; then
+        first_year=${BASH_REMATCH[1]}
+        if [[ "$first_year" == "$last_year" ]]; then
+            new_copyright="// Copyright $first_year The NATS Authors"
+        else
+            new_copyright="// Copyright $first_year-$last_year The NATS Authors"
+        fi
+    else
+        continue # If the format is somehow incorrect, skip the file
+    fi
+
+    # Update the first line
+    if sed --version &>/dev/null; then
+        # Linux sed
+        sed -i "1s|^// Copyright.*|$new_copyright|" "$file"
+    else
+        # BSD/macOS sed, needs -i ''
+        sed -i '' "1s|^// Copyright.*|$new_copyright|" "$file"
+    fi
+done