Load Variables from .env Files

#!/bin/sh

#
# Load variables from '.env' files
#
# Usage:
#
# To inject '.env' variables and run a command:
#     dotenv my_command param1 param2
#
# To inject '.env' configs into the current shell:
#     . dotenv
#
# Original code by madcoda/dotenv-shell
# <https://github.com/madcoda/dotenv-shell>
#

set -e

is_comment() {
    case "$1" in
    \#*)
        if [ "$VERBOSE" = 1 ]; then
            echo "Skip: $1" >&2
        fi
        return 0
        ;;
    esac
    return 1
}

export_env_vars() {
    while IFS='=' read -r key temp; do
        if is_comment "$key"; then
            continue
        fi
        value=$(eval echo "$temp")
        eval export "$key='$value'";
    done < .env
}

# inject .env configs into the shell
if [ -r .env ] && [ -f .env ]; then
    export_env_vars
else
    echo "no '.env' file to load" >&2
fi

# then run whatever commands you like
if [ $# -gt 0 ]; then
    exec "$@"
fi