Add rpn parser and infix solver

djpianalto.com/goff/exts/fun.go

@@ -3,6 +3,7 @@ package exts
 import (
 	"fmt"
 	"strconv"
+	"strings"
 
 	"djpianalto.com/goff/djpianalto.com/goff/utils"
 	"github.com/dustinpianalto/disgoman"
@@ -50,10 +51,34 @@ func deinterleave(ctx disgoman.Context, args []string) {
 	}
 }
 
-func rpn(ctx disgoman.Context, args []string) {
+func generateRPNCommand(ctx disgoman.Context, args []string) {
 	rpn, err := utils.GenerateRPN(args)
 	if err != nil {
 		ctx.Send(err.Error())
+		return
 	}
 	ctx.Send(rpn)
 }
+
+func parseRPNCommand(ctx disgoman.Context, args []string) {
+	res, err := utils.ParseRPN(args)
+	if err != nil {
+		ctx.Send(err.Error())
+		return
+	}
+	ctx.Send(fmt.Sprintf("The result is: %v", res))
+}
+
+func solveCommand(ctx disgoman.Context, args []string) {
+	rpn, err := utils.GenerateRPN(args)
+	if err != nil {
+		ctx.Send(err.Error())
+		return
+	}
+	res, err := utils.ParseRPN(strings.Split(rpn, " "))
+	if err != nil {
+		ctx.Send(err.Error())
+		return
+	}
+	ctx.Send(fmt.Sprintf("The result is: %v", res))
+}

djpianalto.com/goff/exts/init.go

@@ -187,12 +187,31 @@ func AddCommandHandlers(h *disgoman.CommandManager) {
 		Invoke:              deinterleave,
 	})
 	_ = h.AddCommand(&disgoman.Command{
-		Name:                "rpn",
-		Aliases:             []string{},
+		Name:                "RPN",
+		Aliases:             []string{"rpn"},
 		Description:         "Convert infix to rpn",
 		OwnerOnly:           false,
 		Hidden:              false,
 		RequiredPermissions: 0,
-		Invoke:              rpn,
+		Invoke:              generateRPNCommand,
 	})
+	_ = h.AddCommand(&disgoman.Command{
+		Name:                "ParseRPN",
+		Aliases:             []string{'PRPN'},
+		Description:         "Parse RPN string and return the result",
+		OwnerOnly:           false,
+		Hidden:              false,
+		RequiredPermissions: 0,
+		Invoke:              parseRPNCommand,
+	})
+	_ = h.AddCommand(&disgoman.Command{
+		Name:                "solve",
+		Aliases:             []string{"math"},
+		Description:         "Solve infix equation and return the result",
+		OwnerOnly:           false,
+		Hidden:              false,
+		RequiredPermissions: 0,
+		Invoke:              solveCommand,
+	})
+
 }