Added help command

repl/repl.go

@@ -1,10 +1,6 @@
 package repl
 
 import (
-	"context"
-	"fmt"
-	"github.com/lmika/gopkgs/fp/maps"
-	"sort"
 	"ucl.lmika.dev/ucl"
 )
 
@@ -25,7 +21,16 @@ func New(opts ...ucl.InstOption) *REPL {
 		inst:        inst,
 		commandDocs: make(map[string]Doc),
 	}
-	inst.SetBuiltin("help", r.helpBuiltin)
+	r.SetCommand("help", r.helpBuiltin, Doc{
+		Brief: "displays help about a command",
+		Detailed: `
+			When used without arguments, 'help' will display the list of known commands,
+			along with a brief description on what each one does.
+
+			When used with an argument, 'help' will display a more detailed explanation
+			of what each command does.
+		`,
+	})
 
 	return r
 }
@@ -42,23 +47,3 @@ func (r *REPL) SetCommand(name string, fn ucl.BuiltinHandler, opts ...CommandOpt
 
 	r.inst.SetBuiltin(name, fn)
 }
-
-func (r *REPL) helpBuiltin(ctx context.Context, args ucl.CallArgs) (any, error) {
-	switch {
-	case args.NArgs() == 0:
-		// TEMP
-		names := maps.Keys(r.commandDocs)
-		sort.Strings(names)
-
-		for _, name := range names {
-			cdoc := r.commandDocs[name]
-			if cdoc.Brief != "" {
-				fmt.Println("%v\t%v", name, r.commandDocs[name])
-			} else {
-				fmt.Println("%v", name)
-			}
-		}
-		// END TEMP
-	}
-	return nil, nil
-}