Add GitHub's Co-authored-by to the latest commit from account name

git-coauthor

#!/usr/bin/env bash

USAGE="Usage: git coauthor USERNAME

It adds the specified user as Co-authored-by into the latest commit.

Example:

$ git coauthor pocke"

if [ -z $1 ]; then
  echo $USAGE
  exit 1
fi

api_resp=$(gh api "/users/$1")
id=$(echo "$api_resp" | jq .id)
name=$(echo "$api_resp" | jq .name)
email=$(echo "$api_resp" | jq .email)

if [ -z $email ]; then
    email="$(echo $id)+$(echo $1)@users.noreply.github.com"
fi
email=$(echo $email | tr -d '"')

title=$(git show -s --format=%s)
body=$(git show -s --format=%b)

git commit --amend -m "$title" -m "$body" -m "Co-authored-by: $name <$email>"