added the default button set to the image server

ui/images.go

@@ -17,11 +17,16 @@ import (
 	"net/http"
 	"path/filepath"
 	"strings"
+
+	"git.erbosoft.com/amy/amsterdam/config"
 )
 
 //go:embed static_images/*
 var static_images embed.FS
 
+//go:embed buttons/*
+var buttons embed.FS
+
 /* mimeTypeFromFilenane returns the MIME type of a file, given its filename.
  * Parameters:
  *     filaname - The name of the file to be tested.
@@ -43,12 +48,22 @@ func mimeTypeFromFilename(filename string) string {
 func AmServeImage(ctxt AmContext) (string, any, error) {
 	components := strings.SplitAfter(ctxt.URLPath(), "/")
 	var err error = nil
-	if len(components) == 4 && components[2] == "builtin/" {
-		var b []byte
-		b, err = static_images.ReadFile(filepath.Join("static_images", components[3]))
-		if err == nil {
-			ctxt.SetOutputType(mimeTypeFromFilename(components[3]))
-			return "bytes", b, nil
+	var b []byte
+	if len(components) == 4 {
+		if components[2] == "builtin/" {
+			b, err = static_images.ReadFile(filepath.Join("static_images", components[3]))
+			if err == nil {
+				ctxt.SetOutputType(mimeTypeFromFilename(components[3]))
+				return "bytes", b, nil
+			}
+		}
+		if components[2] == "button/" {
+			b, err = buttons.ReadFile(filepath.Join("buttons", config.GlobalConfig.Rendering.ButtonSet,
+				components[3]))
+			if err == nil {
+				ctxt.SetOutputType(mimeTypeFromFilename(components[3]))
+				return "bytes", b, nil
+			}
 		}
 	}
 	ctxt.SetRC(http.StatusNotFound)