fix: support Java Maven multi-module detection for composite languages

builder/parser/code/multisvc/multi_services.go

@@ -19,6 +19,8 @@
 package multi
 
 import (
+	"strings"
+
 	"github.com/goodrain/rainbond/builder/parser/types"
 )
 
@@ -30,9 +32,11 @@ type ServiceInterface interface {
 
 // NewMultiServiceI creates a new MultiModuler.
 func NewMultiServiceI(lang string) ServiceInterface {
-	switch lang {
-	case "Java-maven":
-		return NewMaven()
+	for _, part := range strings.Split(lang, ",") {
+		switch strings.TrimSpace(part) {
+		case "Java-maven":
+			return NewMaven()
+		}
 	}
 	return nil
 }

builder/parser/code/multisvc/multi_services_test.go

@@ -0,0 +1,33 @@
+package multi
+
+import "testing"
+
+func TestNewMultiServiceI_SupportsCompositeJavaMaven(t *testing.T) {
+	tests := []struct {
+		name string
+		lang string
+	}{
+		{name: "plain java maven", lang: "Java-maven"},
+		{name: "dockerfile first", lang: "dockerfile,Java-maven"},
+		{name: "java maven first", lang: "Java-maven,dockerfile"},
+		{name: "with spaces", lang: " dockerfile , Java-maven "},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := NewMultiServiceI(tt.lang); got == nil {
+				t.Fatalf("NewMultiServiceI(%q) = nil, want maven parser", tt.lang)
+			}
+		})
+	}
+}
+
+func TestNewMultiServiceI_IgnoresLanguagesWithoutJavaMaven(t *testing.T) {
+	for _, lang := range []string{"dockerfile", "Node.js", "dockerfile,Node.js"} {
+		t.Run(lang, func(t *testing.T) {
+			if got := NewMultiServiceI(lang); got != nil {
+				t.Fatalf("NewMultiServiceI(%q) = %T, want nil", lang, got)
+			}
+		})
+	}
+}