Move kernel command to another file

kernel.go

@@ -0,0 +1,22 @@
+// Copyright 2018 Mikhail Klementev. All rights reserved.
+// Use of this source code is governed by a AGPLv3 license
+// (or later) that can be found in the LICENSE file.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/jollheef/out-of-tree/config"
+)
+
+func kernelListHandler(kcfg config.KernelConfig) (err error) {
+	if len(kcfg.Kernels) == 0 {
+		return errors.New("No kernels found")
+	}
+	for _, k := range kcfg.Kernels {
+		fmt.Println(k.DistroType, k.DistroRelease, k.KernelRelease)
+	}
+	return
+}

main.go

@@ -5,7 +5,6 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"os"
 	"os/user"
@@ -15,14 +14,6 @@ import (
 	"github.com/jollheef/out-of-tree/config"
 )
 
-func kernelListHandler(kcfg config.KernelConfig) (err error) {
-	for _, kernel := range kcfg.Kernels {
-		fmt.Println(kernel.DistroType, kernel.DistroRelease,
-			kernel.KernelRelease)
-	}
-	return
-}
-
 func main() {
 	app := kingpin.New(
 		"out-of-tree",
@@ -50,7 +41,6 @@ func main() {
 
 	dockerTimeoutFlag := app.Flag("docker-timeout", "Timeout for docker")
 	dockerTimeout := dockerTimeoutFlag.Default("1m").Duration()
-
 	pewCommand := app.Command("pew", "Build, run and test module/exploit")
 	pewKernelFlag := pewCommand.Flag("kernel", "Override kernel regex")
 	pewKernel := pewKernelFlag.String()