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templatex.go
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templatex.go
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package util
import (
"bytes"
goformat "go/format"
"os"
"regexp"
"text/template"
"github.com/sliveryou/goctl/internal/errorx"
"github.com/sliveryou/goctl/util/pathx"
)
const regularPerm = 0o666
// DefaultTemplate is a tool to provides the text/template operations
type DefaultTemplate struct {
name string
text string
goFmt bool
}
// With returns an instance of DefaultTemplate
func With(name string) *DefaultTemplate {
return &DefaultTemplate{
name: name,
}
}
// Parse accepts a source template and returns DefaultTemplate
func (t *DefaultTemplate) Parse(text string) *DefaultTemplate {
t.text = text
return t
}
// GoFmt sets the value to goFmt and marks the generated codes will be formatted or not
func (t *DefaultTemplate) GoFmt(format bool) *DefaultTemplate {
t.goFmt = format
return t
}
// SaveTo writes the codes to the target path
func (t *DefaultTemplate) SaveTo(data any, path string, forceUpdate bool) error {
if pathx.FileExists(path) && !forceUpdate {
return nil
}
output, err := t.Execute(data)
if err != nil {
return err
}
return os.WriteFile(path, output.Bytes(), regularPerm)
}
// Execute returns the codes after the template executed
func (t *DefaultTemplate) Execute(data any) (*bytes.Buffer, error) {
tem, err := template.New(t.name).Parse(t.text)
if err != nil {
return nil, errorx.Wrap(err, "template parse error:", t.text)
}
buf := new(bytes.Buffer)
if err = tem.Execute(buf, data); err != nil {
return nil, errorx.Wrap(err, "template execute error:", t.text)
}
if !t.goFmt {
return buf, nil
}
formatOutput, err := goformat.Source(buf.Bytes())
if err != nil {
return nil, errorx.Wrap(err, "go format error:", buf.String())
}
buf.Reset()
buf.Write(formatOutput)
return buf, nil
}
// IsTemplateVariable returns true if the text is a template variable.
// The text must start with a dot and be a valid template.
func IsTemplateVariable(text string) bool {
match, _ := regexp.MatchString(`(?m)^{{(\.\w+)+}}$`, text)
return match
}
// TemplateVariable returns the variable name of the template.
func TemplateVariable(text string) string {
if IsTemplateVariable(text) {
return text[3 : len(text)-2]
}
return ""
}