unixorn/git-extra-commands

#!/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
}

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