Refactor into package structure

internal/pkg/docker/helpers.go

@@ -0,0 +1,56 @@
+package docker
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Extract the repository owner (if any), repository and tag (if any) from a docker image name
+func (lc LabeledContainer) SplitImageParts() (*string, string, *string) {
+	name := lc.Container.Image
+
+	var repository string
+	var owner *string
+	var tag *string
+
+	slashIndex := strings.Index(name, "/")
+	if slashIndex >= 0 {
+		tmp := name[:slashIndex]
+		owner = &tmp
+		name = name[slashIndex+1:]
+	}
+
+	colonIndex := strings.Index(name, ":")
+	if colonIndex >= 0 {
+		tmp := name[colonIndex+1:]
+		tag = &tmp
+
+		repository = name[:colonIndex]
+	} else {
+		repository = name
+	}
+
+	return owner, repository, tag
+}
+
+func (lc LabeledContainer) GetName() string {
+	if len(lc.Container.Names) >= 0 {
+		// trim prefixed "/"
+		return lc.Container.Names[0][1:]
+	} else {
+		return lc.Container.ID[:10]
+	}
+}
+
+
+func CombineImageParts(owner *string, repository string, tag *string) string {
+	image := repository
+	if owner != nil {
+		image = fmt.Sprintf("%s/%s", *owner, image)
+	}
+	if tag != nil {
+		image = fmt.Sprintf("%s:%s", image, *tag)
+	}
+
+	return image
+}