add support for changing the model with --model/-m

main.go

@@ -97,6 +97,37 @@ var Temp float64
 var TopP float64
 var PresencePenalty float64
 var FrequencyPenalty float64
+var Model string
+
+// checkModel verifies that the selected mode id is one that go-gpt3 knows
+// about, producing an error if not.
+//
+// TODO: in future, this could probably leverage gpt3.Client.ListModels() to
+// support the user's fine-tuned models.
+func checkModel(m string) error {
+	knownModels := []string{
+		gpt3.GPT3TextDavinci003,
+		gpt3.GPT3TextDavinci002,
+		gpt3.GPT3TextCurie001,
+		gpt3.GPT3TextBabbage001,
+		gpt3.GPT3TextAda001,
+		gpt3.GPT3TextDavinci001,
+		gpt3.GPT3DavinciInstructBeta,
+		gpt3.GPT3Davinci,
+		gpt3.GPT3CurieInstructBeta,
+		gpt3.GPT3Curie,
+		gpt3.GPT3Ada,
+		gpt3.GPT3Babbage,
+	}
+
+	for _, v := range knownModels {
+		if m == v {
+			return nil
+		}
+	}
+
+	return fmt.Errorf("unknown model '%s', expected one of: %s", m, strings.Join(knownModels, ", "))
+}
 
 func GetCompletionResponse(client *gpt3.Client, ctx context.Context, question string) ([]string, error) {
 	if CleanPrompt {
@@ -108,8 +139,13 @@ func GetCompletionResponse(client *gpt3.Client, ctx context.Context, question st
 		question += "\n"
 	}
 
+	err := checkModel(Model)
+	if err != nil {
+		return nil, err
+	}
+
 	req := gpt3.CompletionRequest{
-		Model:            gpt3.GPT3TextDavinci003,
+		Model:            Model,
 		MaxTokens:        MaxTokens,
 		Prompt:           question,
 		Echo:             Echo,
@@ -136,7 +172,13 @@ func GetEditsResponse(client *gpt3.Client, ctx context.Context, input, instructi
 		input = strings.ReplaceAll(input, "\n", " ")
 		input = strings.ReplaceAll(input, "  ", " ")
 	}
-	m := gpt3.GPT3TextDavinci003
+
+	err := checkModel(Model)
+	if err != nil {
+		return nil, err
+	}
+
+	m := Model
 	req := gpt3.EditsRequest{
 		Model:       &m,
 		Input:       input,
@@ -222,6 +264,7 @@ type NullWriter int
 func (NullWriter) Write([]byte) (int, error) { return 0, nil }
 
 func main() {
+
 	apiKey := os.Getenv("CHATGPT_API_KEY")
 	if apiKey == "" {
 		fmt.Println("CHATGPT_API_KEY environment var is missing\nVisit https://platform.openai.com/account/api-keys to get one\n")
@@ -361,6 +404,7 @@ func main() {
 	rootCmd.Flags().Float64VarP(&TopP, "topp", "", 1.0, "set the TopP parameter")
 	rootCmd.Flags().Float64VarP(&PresencePenalty, "pres", "", 0.0, "set the Presence Penalty parameter")
 	rootCmd.Flags().Float64VarP(&FrequencyPenalty, "freq", "", 0.0, "set the Frequency Penalty parameter")
+	rootCmd.Flags().StringVarP(&Model, "model", "m", gpt3.GPT3TextDavinci003, "select the model to use with -q or -e")
 
 	// run the command
 	rootCmd.Execute()