feat: port engine from lib/ksrv

netutil/engine.go

@@ -0,0 +1,102 @@
+package netutil
+
+import (
+	"bytes"
+	"html/template"
+	"io"
+	"io/fs"
+	"path/filepath"
+)
+
+type Engine struct {
+	name     string
+	Template *template.Template
+}
+
+func NewEngine(name string) *Engine {
+	Ename := "E" + name
+	if Ename == "E" {
+		Ename = "Engine"
+	}
+	return &Engine{Ename, template.New(name)}
+}
+
+func (e *Engine) Funcs(funcMap template.FuncMap) *Engine {
+	e.Template = e.Template.Funcs(funcMap)
+	return e
+}
+func (e *Engine) Parse(text string) (*Engine, error) {
+	tmp, err := e.Template.Parse(text)
+	if err != nil {
+		return e, err
+	}
+	e.Template = tmp
+	return e, err
+}
+func (e *Engine) ParseFS(fs fs.FS, patterns ...string) (*Engine, error) {
+	tmp, err := e.Template.ParseFS(fs, patterns...)
+	if err != nil {
+		return e, err
+	}
+	e.Template = tmp
+	return e, err
+}
+
+func (e *Engine) ParseFiles(filenames ...string) (*Engine, error) {
+	tmp, err := e.Template.ParseFiles(filenames...)
+	if err != nil {
+		return e, err
+	}
+	e.Template = tmp
+	return e, err
+}
+
+func (e *Engine) ParseGlob(pattern string) (*Engine, error) {
+	tmp, err := e.Template.ParseGlob(pattern)
+	if err != nil {
+		return e, err
+	}
+	e.Template = tmp
+	return e, err
+}
+
+func (e *Engine) OverrideGlob(pattern string) (*Engine, error) {
+	matches, _ := filepath.Glob(pattern)
+	if len(matches) <= 0 {
+		// surpass error if no tmpl found
+		return e, nil
+	}
+	tmp, err := e.Template.ParseGlob(pattern)
+	if err != nil {
+		return e, err
+	}
+	e.Template = tmp
+	return e, err
+}
+
+func Must(e *Engine, err error) *Engine {
+	if err != nil {
+		panic(err)
+	}
+	return e
+}
+
+func (e *Engine) ExecuteTemplate(wr io.Writer, name string, data interface{}) error {
+	buf := &bytes.Buffer{}
+	err := e.Template.ExecuteTemplate(buf, name, data)
+	if err != nil {
+		return err
+	}
+	_, err = wr.Write(buf.Bytes())
+	return err
+}
+
+func (e *Engine) Execute(wr io.Writer, data interface{}) error {
+	buf := &bytes.Buffer{}
+	err := e.Template.Execute(buf, data)
+	if err != nil {
+		return err
+	}
+	_, err = wr.Write(buf.Bytes())
+	return err
+}