use "copilot" as default only if it is installed

Author: rainu

config/default.go

@@ -3,15 +3,16 @@ package config
 import (
 	"github.com/rainu/ask-mai/config/expression"
 	"github.com/rainu/ask-mai/config/llm"
+	"github.com/rainu/ask-mai/llms"
 	"github.com/tmc/langchaingo/llms/openai"
 	"github.com/wailsapp/wails/v2/pkg/options"
 	"io"
 	"log/slog"
 	"os"
 )
 
-func defaultConfig() *Config {
-	return &Config{
+func defaultConfig() (result *Config) {
+	result = &Config{
 		Debug: DebugConfig{
 			LogLevel:     int(slog.LevelError),
 			PprofAddress: ":6060",
@@ -31,7 +32,6 @@ func defaultConfig() *Config {
 			PrintVersion: false,
 		},
 		LLM: llm.LLMConfig{
-			Backend: "copilot",
 			CallOptions: llm.CallOptionsConfig{
 				Temperature: -1,
 				TopK:        -1,
@@ -94,4 +94,9 @@ func defaultConfig() *Config {
 			TargetsRaw: []string{PrinterTargetOut},
 		},
 	}
+	if llms.IsCopilotInstalled() {
+		result.LLM.Backend = "copilot"
+	}
+
+	return
 }

config/llm/general.go

@@ -63,7 +63,7 @@ func (c *LLMConfig) GetUsage(field string) string {
 func (c *LLMConfig) Validate() error {
 	b := c.getBackend()
 	if b == nil {
-		return fmt.Errorf("Invalid backend %s", c.Backend)
+		return fmt.Errorf("Invalid backend '%s'", c.Backend)
 	}
 	if ve := b.Validate(); ve != nil {
 		return ve

controller/build.go

@@ -16,12 +16,17 @@ import (
 	"net/http"
 )
 
-func BuildFromConfig(cfg *config.Config, lastState string) (ctrl *Controller, err error) {
+func BuildFromConfig(cfg *config.Config, lastState string, buildMode bool) (ctrl *Controller, err error) {
 	ctrl = &Controller{
 		appConfig: cfg,
 		lastState: lastState,
 	}
 
+	if buildMode {
+		// in build mode the bindings will be generated
+		return ctrl, nil
+	}
+
 	printer := io.MultiResponsePrinter{}
 	if cfg.Printer.Format == config.PrinterFormatPlain {
 		for _, target := range cfg.Printer.Targets {

llms/copilot_helper.go

@@ -2,10 +2,17 @@ package llms
 
 import cmdchain "github.com/rainu/go-command-chain"
 
+var copilotInstalled *bool
+
 func IsCopilotInstalled() bool {
-	err := cmdchain.Builder().
-		Join("gh", "copilot", "-v").
-		Finalize().Run()
+	if copilotInstalled == nil {
+		err := cmdchain.Builder().
+			Join("gh", "copilot", "-v").
+			Finalize().Run()
+
+		installed := err == nil
+		copilotInstalled = &installed
+	}
 
-	return err == nil
+	return *copilotInstalled
 }

main.go

@@ -66,7 +66,7 @@ func main() {
 	}
 	defer cfg.Printer.Close()
 
-	ctrl, err := controller.BuildFromConfig(cfg, os.Getenv(lastStateEnv))
+	ctrl, err := controller.BuildFromConfig(cfg, os.Getenv(lastStateEnv), buildMode)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err.Error())
 		os.Exit(2)