Move the env loadings & command running into main package.

godotenv.go

@@ -19,6 +19,7 @@ import (
 	"bufio"
 	"errors"
 	"os"
+	"os/exec"
 	"strings"
 )
 
@@ -65,6 +66,16 @@ func Read(filenames ...string) (envMap map[string]string, err error) {
 	return
 }
 
+func Exec(filenames []string, cmd string, cmdArgs []string) error {
+	Load(filenames...)
+
+	command := exec.Command(cmd, cmdArgs...)
+	command.Stdin = os.Stdin
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+	return command.Run()
+}
+
 func filenamesOrDefault(filenames []string) []string {
 	if len(filenames) == 0 {
 		return []string{".env"}