add app config and logging interface

imgbom/log.go

@@ -0,0 +1,7 @@
+package imgbom
+
+import "github.com/anchore/imgbom/internal/logger"
+
+func SetLogger(l logger.Logger) {
+	logger.SetLogger(l)
+}

imgbom/presenter/option.go

@@ -1,23 +1,34 @@
 package presenter
 
+import "strings"
+
 const (
-	UnknownPresenterOption Option = iota
-	JSONOption
+	UnknownPresenter Option = iota
+	JSONPresenter
 )
 
 var optionStr = []string{
-	"UnknownPresenterOption",
+	"UnknownPresenter",
 	"json",
 }
 
 var Options = []Option{
-	JSONOption,
+	JSONPresenter,
 }
 
-type Option int
+type Option uint
+
+func ParseOption(userStr string) Option {
+	switch strings.ToLower(userStr) {
+	case strings.ToLower(JSONPresenter.String()):
+		return JSONPresenter
+	default:
+		return UnknownPresenter
+	}
+}
 
 func (o Option) String() string {
-	if int(o) >= len(optionStr) || int(o) < 0 {
+	if int(o) >= len(optionStr) {
 		return optionStr[0]
 	}
 

imgbom/presenter/presenter.go

@@ -2,7 +2,6 @@ package presenter
 
 import (
 	"io"
-	"strings"
 
 	"github.com/anchore/imgbom/imgbom/pkg"
 	"github.com/anchore/imgbom/imgbom/presenter/json"
@@ -13,9 +12,9 @@ type Presenter interface {
 	Present(io.Writer, *image.Image, pkg.Catalog) error
 }
 
-func GetPresenter(userStr string) Presenter {
-	switch strings.ToLower(userStr) {
-	case JSONOption.String():
+func GetPresenter(option Option) Presenter {
+	switch option {
+	case JSONPresenter:
 		return json.NewPresenter()
 	default:
 		return nil

imgbom/scope/option.go

@@ -8,7 +8,7 @@ const (
 	AllLayersScope
 )
 
-type Option int
+type Option uint
 
 var optionStr = []string{
 	"UnknownScope",
@@ -32,7 +32,7 @@ func ParseOption(userStr string) Option {
 }
 
 func (o Option) String() string {
-	if int(o) >= len(optionStr) || int(o) < 0 {
+	if int(o) >= len(optionStr) {
 		return optionStr[0]
 	}