Started working on a REPL helper

repl/repl.go

@@ -0,0 +1,64 @@
+package repl
+
+import (
+	"context"
+	"fmt"
+	"github.com/lmika/gopkgs/fp/maps"
+	"sort"
+	"ucl.lmika.dev/ucl"
+)
+
+type CommandOpt interface {
+	config(cmdName string, r *REPL)
+}
+
+type REPL struct {
+	inst *ucl.Inst
+
+	commandDocs map[string]Doc
+}
+
+func New(opts ...ucl.InstOption) *REPL {
+	inst := ucl.New(opts...)
+
+	r := &REPL{
+		inst:        inst,
+		commandDocs: make(map[string]Doc),
+	}
+	inst.SetBuiltin("help", r.helpBuiltin)
+
+	return r
+}
+
+func (r *REPL) Inst() *ucl.Inst {
+	return r.inst
+}
+
+func (r *REPL) SetCommand(name string, fn ucl.BuiltinHandler, opts ...CommandOpt) {
+	r.commandDocs[name] = Doc{}
+	for _, opt := range opts {
+		opt.config(name, r)
+	}
+
+	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
+}