fix some error handling

cmd/cli/main.go

@@ -86,11 +86,11 @@ func LoadSourceURI(uri string) []*resource.Document {
 	if uri != "" {
 		ds, err := source.SourceTypes.New(uri)
 		if err != nil {
-			log.Fatal(err)
+			slog.Error("Failed loading document from source", "error", err)
 		}
 		extractDocuments, extractErr := ds.ExtractResources(nil)
 		if extractErr != nil {
-			log.Fatal(extractErr)
+			slog.Error("Failed loading resources from source", "error", extractErr)
 		}
 		return extractDocuments
 	}
@@ -126,7 +126,7 @@ func ImportSubCommand(cmd *flag.FlagSet, output io.Writer) (err error) {
 	slog.Info("main.ImportResource", "args", os.Args, "output", GlobalOutput)
 	outputTarget, err := target.TargetTypes.New(GlobalOutput)
 	if err != nil {
-		log.Fatal(err)
+		slog.Error("Failed opening target", "error", err)
 	}
 	defer outputTarget.Close()
 
@@ -140,7 +140,7 @@ func ImportSubCommand(cmd *flag.FlagSet, output io.Writer) (err error) {
 			if *ImportResource != "" {
 				slog.Info("ImportResource", "resource", ImportResource)
 				if addResourceErr := d.AddResource(*ImportResource); addResourceErr != nil {
-					log.Fatal(addResourceErr)
+					slog.Error("Failed adding resource", "error", addResourceErr)
 				}
 			}
 

internal/resource/declaration.go

@@ -114,7 +114,7 @@ func (d *Declaration) SetURI(uri string) error {
 	slog.Info("Declaration.SetURI()", "uri", uri, "declaration", d)
 	d.Attributes = NewResource(uri)
 	if d.Attributes == nil {
-		panic("unknown resource")
+		return ErrUnknownResourceType
 	}
 	d.Type = TypeName(d.Attributes.Type())
 	_,e := d.Attributes.Read(context.Background()) // fix context