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package templatemanager
import (
"bytes"
"fmt"
"html/template"
"path/filepath"
"strings"
)
type TemplateManager struct {
templates map[string]templateManagerRender
}
type templateManagerRender struct {
Main string
Tmpl *template.Template
}
type TemplateManagerTemplates struct {
Name string
Files []string
}
var templateFuncMap = template.FuncMap{
"contains": strings.Contains,
"iterate": func(count uint) []uint {
items := make([]uint, count)
for i := range count {
items[i] = i
}
return items
},
"replace": strings.ReplaceAll,
}
func NewTemplateManager(templates ...TemplateManagerTemplates) (*TemplateManager, error) {
templateMap := make(map[string]templateManagerRender)
for _, tmplStruct := range templates {
tmpl := template.New(tmplStruct.Name).Funcs(templateFuncMap)
tmpl, err := tmpl.ParseFiles(tmplStruct.Files...)
if err != nil {
return nil, err
}
templateMap[tmplStruct.Name] = templateManagerRender{
Main: filepath.Base(tmplStruct.Files[0]),
Tmpl: tmpl,
}
}
return &TemplateManager{
templates: templateMap,
}, nil
}
func (tm *TemplateManager) Render(name string, data any, files ...string) ([]byte, error) {
tmpl, exists := tm.templates[name]
if !exists {
return nil, fmt.Errorf("template %s is not found", name)
}
var err error
var tempTmpl *template.Template
if len(files) == 0 {
tempTmpl = tmpl.Tmpl
} else {
tempTmpl, err = tmpl.Tmpl.Clone()
if err != nil {
return nil, fmt.Errorf("couldn't clone existing template for rendering: %w", err)
}
tempTmpl, err = tempTmpl.ParseFiles(files...)
if err != nil {
return nil, fmt.Errorf("couldn't include additional files in template rendering: %w", err)
}
}
var buf bytes.Buffer
err = tempTmpl.ExecuteTemplate(&buf, tmpl.Main, data)
return buf.Bytes(), err
}
func (tm *TemplateManager) Add(name string, files ...string) error {
if len(files) == 0 {
return fmt.Errorf("you can't add template without any files")
}
tmpl := template.New(name).Funcs(templateFuncMap)
tmpl, err := tmpl.ParseFiles(files...)
if err != nil {
return fmt.Errorf("failed to add template into manager: %w", err)
}
tm.templates[name] = templateManagerRender{
Main: filepath.Base(files[0]),
Tmpl: tmpl,
}
return nil
}
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