A tiny script to register and switch between Git users.

git-users

#!/bin/bash
# Path to the Git user file
GIT_USERS_FILE=~/.gitusers

# Check if Git is installed
if ! command -v git &>/dev/null; then
	echo "Git is not installed on this machine"
	exit
fi

# Create the Git user file if it doesn't exist
if [ ! -f $GIT_USERS_FILE ]; then
	# Check if there is a default Git user set
	default_git_user=$(git config user.email)
	if [ -n "$default_git_user" ]; then
		echo "Adding default Git user: $(git config user.name) <$default_git_user> to $GIT_USERS_FILE"
		echo "$(git config user.name) <$default_git_user>" >>$GIT_USERS_FILE
	else
		echo "No Git users found and no default user set"
	fi
fi

# Add a user to the Git configuration
function git_add_user() {
	echo "Enter the name of the user:"
	read name
	echo "Enter the email of the user:"
	read email
	# Check if the user already exists in the file
	if grep -q "$name <$email>" "$GIT_USERS_FILE"; then
		echo "User already exists: $name <$email>"
	else
		echo "$name <$email>" >>$GIT_USERS_FILE
		echo "User added: $name <$email>"
	fi
}

# Delete a user from the Git configuration
function git_delete_user() {
	if [ ! -s "$GIT_USERS_FILE" ]; then
		echo "No Git users found."
		return
	fi
	echo "Select the user to delete:"
	select user in $(cat $GIT_USERS_FILE); do
		if [[ -n "$user" ]]; then
			read -p "Are you sure you want to delete $user? (y/n) " choice
			case "$choice" in
			y | Y)
				sed -i "/$user/d" $GIT_USERS_FILE
				echo "User deleted: $user"
				break
				;;
			n | N)
				echo "Operation cancelled"
				break
				;;
			*) echo "Invalid choice" ;;
			esac
		else
			echo "Invalid choice"
		fi
	done
}

# List all users in the Git configuration
function git_list_users() {
	if [ ! -s "$GIT_USERS_FILE" ]; then
		echo "No Git users found."
		return
	fi
	echo "Git users:"
	while IFS= read -r user; do
		echo " - $user"
	done <"$GIT_USERS_FILE"
}

# Activate a user in the Git configuration
function git_activate_user() {
	local scope="--global" # Default to global configuration
	if [[ "$2" == "--local" ]]; then
		scope="--local" # Set to local configuration if --local is specified
	fi

	echo "Select the user to activate:"
	mapfile -t users < <(sed 's/^[[:space:]]*//;s/[[:space:]]*$//' "$GIT_USERS_FILE")
	select user in "${users[@]}"; do
		if [[ -n "$user" ]]; then
			user_name=$(echo $user | cut -d'<' -f1 | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
			user_email=$(echo $user | cut -d'<' -f2 | cut -d'>' -f1 | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
			git config $scope user.name "$user_name"
			git config $scope user.email "$user_email"
			echo "User activated: $user_name <$user_email> with scope $([ "$scope" == "--global" ] && echo "global" || echo "local")"
			break
		else
			echo "Invalid choice"
		fi
	done
}

# Show the currently active user in the Git configuration
function git_which_user_is_active() {
	local global_user_name=$(git config --global user.name)
	local global_user_email=$(git config --global user.email)
	local local_user_name=$(git config --local user.name)
	local local_user_email=$(git config --local user.email)

	echo "Git user configuration:"

	if [ -n "$global_user_name" ] || [ -n "$global_user_email" ]; then
		echo "  Global: $global_user_name <$global_user_email>"
	else
		echo "  Global user not set"
	fi

	if [ -n "$local_user_name" ] || [ -n "$local_user_email" ]; then
		echo "  Local (current repository): $local_user_name <$local_user_email>"
	else
		echo "  Local (current repository) user not set"
	fi
}

# Read the command line argument and call the corresponding function
case "$1" in
"add") git_add_user ;;
"delete") git_delete_user ;;
"list") git_list_users ;;
"activate") git_activate_user "$@" ;; # Pass all arguments
"which") git_which_user_is_active ;;
*) echo "Usage: $0 {add|delete|list|activate|which} [Use --local with 'activate' to apply to the current repository]" ;;
esac