chore: add a script to update copyright end-year

scripts/update-copyright-years.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+## run this script onece a year
+
+set -euo pipefail
+
+THIS_YEAR="$(date +'%Y')"
+
+fix_copyright_year() {
+    local file="$1"
+    if [[ $file != *.erl ]] && \
+       [[ $file != *.ex ]] && \
+       [[ $file != *.hrl ]] && \
+       [[ $file != *.proto ]]; then
+        ## Ignore other file
+        return 0
+    fi
+    local copyright_line
+    copyright_line="$(head -2 "$file" | grep -E "Copyright\s\(c\)\s.+\sEMQ" || true)"
+    local begin_year
+    begin_year="$(echo "$copyright_line" | sed -E 's#%% Copyright \(c\) (20..).*#\1#g')"
+    if [ "$begin_year" = "$THIS_YEAR" ]; then
+        ## new file added this year
+        return 0
+    fi
+    if [ -z "$copyright_line" ]; then
+        ## No Copyright info, it is not intended to add one from this script
+        echo "Ignored $file"
+        return 0
+    fi
+    sed -E "s#(%% Copyright \(c\) 20..)(-20.. | )(.*)#\1-$THIS_YEAR \3#g" -i "$file"
+}
+
+while read -r file; do
+    fix_copyright_year "$file"
+done < <(git ls-files)