Refine the template to fix excessive newlines

.gitignore

@@ -0,0 +1 @@
+Test.lua

class.tmpl

@@ -1,23 +1,22 @@
 ---@diagnostic disable: missing-return
-{{range .Fields}}
+{{range .Fields -}}
 ---@field {{.Name}} {{.Type}} {{.Comment}}
 {{end}}
 {{.ClassName}} = {
-	{{$n := len .Methods}}
-	{{$methods := len .Methods}}
-	{{range $index, $method := .Methods}}
+	{{$n := len .Methods -}}
+	{{$methods := len .Methods -}}
+	{{range $index, $method := .Methods -}}
 	---@param self {{$.ClassName}}
-	{{range $param := $method.Params}}
+	{{range $param := $method.Params -}}
 	---@param {{.Name}} {{.Type}} {{.Comment}}
-	{{end}}
-	{{range $ret := $method.Returns}}
+	{{end -}}
+	{{range $ret := $method.Returns -}}
 	---@return {{.Type}} {{if ne .Comment ""}}#{{.Comment}}{{end}}
-	{{end}}
+	{{end -}}
 	{{.Name}} = function(self{{if gt (len .Params) 0}}, {{range $index, $param := .Params}}{{if $index}}, {{end}}{{$param.Name}}{{end}}{{end}}) end,
-	{{if eq (plus1 $index) $n}}
+	{{- if ne (plus1 $index) $n}}
 
-	{{end}}
-	{{end}}
+	{{end}}{{end}}
 }
 
 ---@type ({{$.ClassName}} | fun(): {{$.ClassName}})

main.go

@@ -30,6 +30,12 @@ func init() {
 		log.Lmicroseconds|log.Lshortfile)
 }
 
+var fns = template.FuncMap{
+	"plus1": func(x int) int {
+		return x + 1
+	},
+}
+
 func main() {
 	flag.Parse()
 	files := flag.Args()
@@ -49,25 +55,42 @@ func main() {
 			{
 				Name: "test",
 				Params: []Param{
-					{Name: "a", Type: "int", Comment: "test"},
-					{Name: "b", Type: "string", Comment: "test"},
+					{Name: "a", Type: "int", Comment: "test param 1"},
+					{Name: "b", Type: "string", Comment: "test param 2"},
 				},
 				Returns: []Return{
-					{Type: "int", Comment: "test"},
-					{Type: "string", Comment: "test"},
+					{Type: "int", Comment: "test return int"},
+					{Type: "string", Comment: "test return string"},
 				},
-				Comment: "test",
+				Comment: "test method",
+			},
+			{
+				Name: "test2",
+				Params: []Param{
+					{Name: "a", Type: "int", Comment: "test param 1"},
+					{Name: "b", Type: "string", Comment: "test param 2"},
+				},
+				Returns: []Return{
+					{Type: "int", Comment: "test return int"},
+					{Type: "string", Comment: "test return string"},
+				},
+				Comment: "test method",
 			},
 		},
 	}
 
-	ltemplate, err := template.New("class").Parse(templatestr)
+	ltemplate, err := template.New("class").Funcs(fns).Parse(templatestr)
 	if err != nil {
 		Error.Printf("Error parsing template: %v", err)
 		return
 	}
-	log.Printf("%#v", ltemplate)
-	ltemplate.Execute(os.Stdout, test)
+
+	outfile, err := test.GetOutFile()
+	if err != nil {
+		Error.Printf("Error creating output file: %v", err)
+		return
+	}
+	ltemplate.Execute(outfile, test)
 
 	for _, file := range files {
 		fmt.Println(file)

types.go

@@ -1,10 +1,16 @@
 package main
 
+import (
+	"fmt"
+	"os"
+)
+
 type (
 	Class struct {
-		ClassName string
-		Fields    []Field
-		Methods   []Method
+		ClassName    string
+		Fields       []Field
+		Methods      []Method
+		Constructors []Constructor
 	}
 	Field struct {
 		Name    string
@@ -26,4 +32,20 @@ type (
 		Type    string
 		Comment string
 	}
+	Constructor struct {
+		Params  []Param
+		Comment string
+	}
 )
+
+func (c *Class) GetOutFile() (*os.File, error) {
+	if c.ClassName == "" {
+		return nil, fmt.Errorf("ClassName is empty")
+	}
+	filename := fmt.Sprintf("%s.lua", c.ClassName)
+	f, err := os.Create(filename)
+	if err != nil {
+		return nil, err
+	}
+	return f, nil
+}