co-authored-by

#!/usr/bin/env bash

# Usage: co-authored-by <name> <name-2> <name-3> ...
# Example: co-authored-by dan juan valeria

set -eu

declare -a authors

for a in "$@"; do
    authors+=("$(printf '%s' "--author=${a}")")
done

git log "${authors[@]}" | awk '/^Author:/ && !seen[$2]++ {print}' | sed 's/Author:/Co-authored-by:/g'