feat: some basic commands

internal/cli/exit.go

@@ -1,18 +0,0 @@
-// Package "cli" provides miscellaneous helper functions.
-package cli
-
-import (
-	"fmt"
-	"os"
-)
-
-// A helper function to handle errors in the program. If it is given an error,
-// the program will exist, and print the error.
-func HandleError(err error) {
-	if err == nil {
-		return
-	}
-
-	fmt.Fprintln(os.Stderr, "ERROR:", err)
-	os.Exit(1)
-}

internal/registry/registry.go

@@ -2,6 +2,8 @@ package registry
 
 import (
 	"fmt"
+	"iter"
+	"maps"
 
 	"git.maximhutz.com/max/lambda/internal/cli"
 )
@@ -63,7 +65,7 @@ func (r *Registry) MustAddEngine(e cli.Engine) {
 	}
 }
 
-func (r *Registry) GetEngine(name string) (cli.Engine, error) {
+func (r Registry) GetEngine(name string) (cli.Engine, error) {
 	e, ok := r.engines[name]
 	if !ok {
 		return nil, fmt.Errorf("engine '%s' not found", name)
@@ -72,6 +74,10 @@ func (r *Registry) GetEngine(name string) (cli.Engine, error) {
 	return e, nil
 }
 
+func (r Registry) ListEngines() iter.Seq[cli.Engine] {
+	return maps.Values(r.engines)
+}
+
 func (r *Registry) GetDefaultEngine(id string) (cli.Engine, error) {
 	for _, engine := range r.engines {
 		if engine.InType() == id {