diff --git a/cmdext/builder.go b/cmdext/builder.go
new file mode 100644
index 0000000..c97d15f
--- /dev/null
+++ b/cmdext/builder.go
@@ -0,0 +1,56 @@
+package cmdext
+
+import (
+	"fmt"
+	"time"
+)
+
+type CommandRunner struct {
+	program string
+	args    []string
+	timeout *time.Duration
+	env     []string
+}
+
+func Runner(program string) *CommandRunner {
+	return &CommandRunner{
+		program: program,
+		args:    make([]string, 0),
+		timeout: nil,
+		env:     make([]string, 0),
+	}
+}
+
+func (r *CommandRunner) Arg(arg string) *CommandRunner {
+	r.args = append(r.args, arg)
+	return r
+}
+
+func (r *CommandRunner) Args(arg []string) *CommandRunner {
+	r.args = append(r.args, arg...)
+	return r
+}
+
+func (r *CommandRunner) Timeout(timeout time.Duration) *CommandRunner {
+	r.timeout = &timeout
+	return r
+}
+
+func (r *CommandRunner) Env(key, value string) *CommandRunner {
+	r.env = append(r.env, fmt.Sprintf("%s=%s", key, value))
+	return r
+}
+
+func (r *CommandRunner) RawEnv(env string) *CommandRunner {
+	r.env = append(r.env, env)
+	return r
+}
+
+func (r *CommandRunner) Envs(env []string) *CommandRunner {
+	r.env = append(r.env, env...)
+	return r
+}
+
+func (r *CommandRunner) Run() (CommandResult, error) {
+	return run(*r)
+}
diff --git a/cmdext/cmdrunner.go b/cmdext/cmdrunner.go
index c00ff6d..49d749e 100644
--- a/cmdext/cmdrunner.go
+++ b/cmdext/cmdrunner.go
@@ -14,9 +14,9 @@ type CommandResult struct {
 	CommandTimedOut bool
 }
 
-func RunCommand(program string, args []string, timeout *time.Duration) (CommandResult, error) {
-
-	cmd := exec.Command(program, args...)
+func run(opt CommandRunner) (CommandResult, error) {
+	cmd := exec.Command(opt.program, opt.args...)
+	cmd.Env = append(cmd.Env, opt.env)
 
 	stdoutPipe, err := cmd.StdoutPipe()
 	if err != nil {
@@ -75,68 +75,42 @@ func RunCommand(program string, args []string, timeout *time.Duration) (CommandR
 		}
 	}()
 
-	if timeout != nil {
+	var timeoutChan <-chan time.Time = make(chan time.Time, 1)
+	if opt.timeout != nil {
+		timeoutChan = time.After(*opt.timeout)
+	}
 
-		select {
+	select {
 
-		case <-time.After(*timeout):
-			_ = cmd.Process.Kill()
+	case <-timeoutChan:
+		_ = cmd.Process.Kill()
+		return CommandResult{
+			StdOut:          stdout,
+			StdErr:          stderr,
+			StdCombined:     stdcombined,
+			ExitCode:        -1,
+			CommandTimedOut: true,
+		}, nil
+
+	case err := <-errch:
+		if exiterr, ok := err.(*exec.ExitError); ok {
 			return CommandResult{
 				StdOut:          stdout,
 				StdErr:          stderr,
 				StdCombined:     stdcombined,
-				ExitCode:        -1,
-				CommandTimedOut: true,
+				ExitCode:        exiterr.ExitCode(),
+				CommandTimedOut: false,
+			}, nil
+		} else if err != nil {
+			return CommandResult{}, err
+		} else {
+			return CommandResult{
+				StdOut:          stdout,
+				StdErr:          stderr,
+				StdCombined:     stdcombined,
+				ExitCode:        0,
+				CommandTimedOut: false,
 			}, nil
-
-		case err := <-errch:
-			if exiterr, ok := err.(*exec.ExitError); ok {
-				return CommandResult{
-					StdOut:          stdout,
-					StdErr:          stderr,
-					StdCombined:     stdcombined,
-					ExitCode:        exiterr.ExitCode(),
-					CommandTimedOut: false,
-				}, nil
-			} else if err != nil {
-				return CommandResult{}, err
-			} else {
-				return CommandResult{
-					StdOut:          stdout,
-					StdErr:          stderr,
-					StdCombined:     stdcombined,
-					ExitCode:        0,
-					CommandTimedOut: false,
-				}, nil
-			}
-
-		}
-
-	} else {
-
-		select {
-
-		case err := <-errch:
-			if exiterr, ok := err.(*exec.ExitError); ok {
-				return CommandResult{
-					StdOut:          stdout,
-					StdErr:          stderr,
-					StdCombined:     stdcombined,
-					ExitCode:        exiterr.ExitCode(),
-					CommandTimedOut: false,
-				}, nil
-			} else if err != nil {
-				return CommandResult{}, err
-			} else {
-				return CommandResult{
-					StdOut:          stdout,
-					StdErr:          stderr,
-					StdCombined:     stdcombined,
-					ExitCode:        0,
-					CommandTimedOut: false,
-				}, nil
-			}
-
 		}
 	}
 }
diff --git a/cmdext/helper.go b/cmdext/helper.go
new file mode 100644
index 0000000..e21496d
--- /dev/null
+++ b/cmdext/helper.go
@@ -0,0 +1,12 @@
+package cmdext
+
+import "time"
+
+func RunCommand(program string, args []string, timeout *time.Duration) (CommandResult, error) {
+	b := Runner(program)
+	b = b.Args(args)
+	if timeout != nil {
+		b = b.Timeout(*timeout)
+	}
+	return b.Run()
+}