Have got text transformations working

app.go

@@ -2,7 +2,10 @@ package main
 
 import (
 	"context"
-	"fmt"
+	"log"
+
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+	"lmika.dev/pkg/modash/moslice"
 )
 
 // App struct
@@ -22,6 +25,30 @@ func (a *App) startup(ctx context.Context) {
 }
 
 // Greet returns a greeting for the given name
-func (a *App) Greet(name string) string {
-	return fmt.Sprintf("Hello %s, It's show time!", name)
+func (a *App) ProcessText(req ProcessTextRequest) {
+	filter, ok := TextFilters[req.Action]
+	if !ok {
+		log.Printf("Unknown filter: [%s]", req.Action)
+		return
+	}
+
+	resp, err := moslice.MapWithError(req.Input, func(span TextSpan) (TextSpan, error) {
+		outStr, err := filter(span.Text)
+		if err != nil {
+			return TextSpan{}, err
+		}
+		return TextSpan{
+			Text: outStr,
+			Pos:  span.Pos,
+			Len:  span.Len,
+		}, nil
+	})
+	if err != nil {
+		log.Printf("Error running filter: %s", err)
+		return
+	}
+
+	runtime.EventsEmit(a.ctx, "process-text-response", ProcessTextResponse{
+		Output: resp,
+	})
 }