make core search format agnostic

Author: Massimiliano Pippi

cli/core/search.go

@@ -66,25 +66,30 @@ func runSearchCommand(cmd *cobra.Command, args []string) {
 	}
 
 	coreslist := resp.GetSearchOutput()
-	if globals.OutputFormat == "json" {
-		feedback.PrintJSON(coreslist)
-	} else {
-		outputSearchCores(coreslist)
-	}
+	feedback.PrintResult(searchResults{coreslist})
+}
+
+// ouput from this command requires special formatting, let's create a dedicated
+// feedback.Result implementation
+type searchResults struct {
+	platforms []*rpc.Platform
+}
+
+func (sr searchResults) Data() interface{} {
+	return sr.platforms
 }
 
-func outputSearchCores(cores []*rpc.Platform) {
-	if len(cores) > 0 {
+func (sr searchResults) String() string {
+	if len(sr.platforms) > 0 {
 		t := table.New()
 		t.SetHeader("ID", "Version", "Name")
-		sort.Slice(cores, func(i, j int) bool {
-			return cores[i].ID < cores[j].ID
+		sort.Slice(sr.platforms, func(i, j int) bool {
+			return sr.platforms[i].ID < sr.platforms[j].ID
 		})
-		for _, item := range cores {
+		for _, item := range sr.platforms {
 			t.AddRow(item.GetID(), item.GetLatest(), item.GetName())
 		}
-		feedback.Print(t.Render())
-	} else {
-		feedback.Print("No platforms matching your search.")
+		return t.Render()
 	}
+	return "No platforms matching your search."
 }