#!/bin/sh

# git-whoami
# Author: Peter Eisentraut <peter@eisentraut.org>
# Created: 2011-10-27
# License: WTFPL; see http://sam.zoy.org/wtfpl/

# exact logic in ident.c in git source tree

set -e

get_email() {
	git config user.email || ( [ -n "${EMAIL}" ] && echo "${EMAIL}" ) || echo "$(id -nu)@$(hostname --fqdn)"
}

get_name() {
	git config user.name || getent passwd "$(id -un)" | cut -d : -f 5 | cut -d , -f 1
}

GIT_AUTHOR_NAME="${GIT_AUTHOR_NAME:-$(get_name)}"
GIT_AUTHOR_EMAIL="${GIT_AUTHOR_EMAIL:-$(get_email)}"
GIT_COMMITTER_NAME="${GIT_COMMITER_NAME:-$(get_name)}"
GIT_COMMITTER_EMAIL="${GIT_COMMITER_EMAIL:-$(get_email)}"

author="$GIT_AUTHOR_NAME <${GIT_AUTHOR_EMAIL}>"
commit="$GIT_COMMITTER_NAME <${GIT_COMMITTER_EMAIL}>"

if [ "${author}" = "${commit}" ]; then
	echo "${author}"
else
	echo "Author: ${author}"
	echo "Commit: ${commit}"
fi