Fix return parametrized error and added go Mod.

Return code renderer was missing the loop to add multiple instances of the same type if there were multiple return named values with the same type in a list form.
I also added support for go mod (Finally!) fixes #127 fixed #122 fixes #31

.travis.yml

@@ -5,7 +5,7 @@ go:
   - 1.11.x
 
 before_install:
-  - go get -t -v ./...
+  - go mod download
   - go get -u golang.org/x/lint/golint
   - go get github.com/fzipp/gocyclo/cmd/gocyclo
 script:

ClassDiagram.puml

@@ -37,6 +37,7 @@ namespace parser {
         - parseFileDeclarations(node ast.Decl) 
         - handleFuncDecl(decl *ast.FuncDecl) 
         - handleGenDecl(decl *ast.GenDecl) 
+        - processSpec(spec ast.Spec) 
         - renderStructures(pack string, structures <font color=blue>map</font>[string]*Struct, str *LineStringBuilder) 
         - renderAliases(str *LineStringBuilder) 
         - renderStructure(structure *Struct, pack string, name string, str *LineStringBuilder, composition *LineStringBuilder, extends *LineStringBuilder, aggregations *LineStringBuilder) 
@@ -86,6 +87,7 @@ namespace parser {
         + Aliases bool
         + ConnectionLabels bool
         + AggregatePrivateMembers bool
+        + PrivateMembers bool
 
     }
     class Struct << (S,Aquamarine) >> {

go.mod

@@ -0,0 +1,7 @@
+module github.com/jfeliu007/goplantuml
+
+go 1.17
+
+require github.com/spf13/afero v1.8.2
+
+require golang.org/x/text v0.3.7 // indirect

parser/function.go

@@ -68,8 +68,15 @@ func getFunction(f *ast.FuncType, name string, aliases map[string]string, packag
 	if results != nil {
 		for _, pa := range results.List {
 			theType, _ := getFieldType(pa.Type, aliases)
-			function.ReturnValues = append(function.ReturnValues, replacePackageConstant(theType, ""))
-			function.FullNameReturnValues = append(function.FullNameReturnValues, replacePackageConstant(theType, packageName))
+			count := 1
+			if pa.Names != nil {
+				count = len(pa.Names)
+			}
+			for count > 0 {
+				count--
+				function.ReturnValues = append(function.ReturnValues, replacePackageConstant(theType, ""))
+				function.FullNameReturnValues = append(function.FullNameReturnValues, replacePackageConstant(theType, packageName))
+			}
 		}
 	}
 	return function

testingsupport/subfolder1-2.puml

@@ -2,6 +2,7 @@
 namespace subfolder2 {
     class Subfolder2 << (S,Aquamarine) >> {
         + SubfolderFunction(b bool, i int) bool
+        + SubfolderFunctionWithReturnListParametrized() ([]byte, []byte, []byte, error)
 
     }
 }

testingsupport/subfolder2/subfolder2.go

@@ -8,3 +8,7 @@ type Subfolder2 struct {
 func (s *Subfolder2) SubfolderFunction(b bool, i int) bool {
 	return true
 }
+
+func (s *Subfolder2) SubfolderFunctionWithReturnListParametrized() (a, b, c []byte, err error) {
+	return
+}