Autocomplete property names and options

autocomplete/autocomplete.go

@@ -1,7 +1,11 @@
 package autocomplete
 
 import (
+	"github.com/centurylinkcloud/clc-go-cli/base"
 	"github.com/centurylinkcloud/clc-go-cli/command_loader"
+	"github.com/centurylinkcloud/clc-go-cli/options"
+	"github.com/centurylinkcloud/clc-go-cli/parser"
+	"reflect"
 	"strings"
 )
 
@@ -19,13 +23,58 @@ func Run(args []string) string {
 	if len(args) == 1 {
 		return strings.Join(command_loader.GetCommands(resource), " ")
 	}
+
 	cmdArg := args[1]
-	_, err = command_loader.LoadCommand(resource, cmdArg)
+	cmd, err := command_loader.LoadCommand(resource, cmdArg)
 	if err != nil {
 		if len(args) == 2 {
 			return strings.Join(command_loader.GetCommands(resource), " ")
 		}
 		return ""
 	}
-	return ""
+
+	var arguments []string
+	if cmd.Command() == "" {
+		arguments = args[1:]
+	} else {
+		arguments = args[2:]
+	}
+	if len(arguments) == 0 {
+		return strings.Join(optionsAndArguments(cmd), " ")
+	}
+	parsed, err := parser.ParseArguments(arguments)
+	if err != nil {
+		return ""
+	}
+	yes, _, err := options.AreToBeTakenFromFile(parsed)
+	if yes || err != nil {
+		return ""
+	}
+	_, err = options.ExtractFrom(parsed)
+	if err != nil {
+		// Do not show anything if option needs a value.
+		return ""
+	}
+	last := args[len(args)-1]
+	if strings.HasPrefix(last, "--") {
+		if hasArg(cmd.InputModel(), parser.NormalizePropertyName(last)) {
+			// TODO autocomplete property values
+			return ""
+		}
+	}
+	return strings.Join(optionsAndArguments(cmd), " ")
+}
+
+func optionsAndArguments(command base.Command) []string {
+	opts := options.Get()
+	args := command.Arguments()
+	return append(opts, args...)
+}
+
+func hasArg(m interface{}, f string) bool {
+	meta := reflect.ValueOf(m).Elem()
+	if meta.FieldByName(f).IsValid() {
+		return true
+	}
+	return false
 }