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package templates
import (
"bytes"
"fmt"
"io"
"os"
"path"
"reflect"
"text/template"
"git.sr.ht/~rjarry/aerc/models"
"github.com/mitchellh/go-homedir"
)
func findTemplate(templateName string, templateDirs []string) (string, error) {
for _, dir := range templateDirs {
templateFile, err := homedir.Expand(path.Join(dir, templateName))
if err != nil {
return "", err
}
if _, err := os.Stat(templateFile); os.IsNotExist(err) {
continue
}
return templateFile, nil
}
return "", fmt.Errorf(
"Can't find template %q in any of %v ", templateName, templateDirs)
}
func ParseTemplateFromFile(
name string, dirs []string, data models.TemplateData,
) (io.Reader, error) {
templateFile, err := findTemplate(name, dirs)
if err != nil {
return nil, err
}
emailTemplate, err := template.New(name).
Funcs(templateFuncs).ParseFiles(templateFile)
if err != nil {
return nil, err
}
var body bytes.Buffer
if err := Render(emailTemplate, &body, data); err != nil {
return nil, err
}
return &body, nil
}
func ParseTemplate(name, content string) (*template.Template, error) {
return template.New(name).Funcs(templateFuncs).Parse(content)
}
func Render(t *template.Template, w io.Writer, data models.TemplateData) error {
return t.Execute(w, data)
}
// builtins is a slice of keywords and functions built into the Go standard
// library for templates. Since they are not exported, they are hardcoded here.
var builtins = []string{
// from the Go standard library: src/text/template/parse/lex.go
"block",
"break",
"continue",
"define",
"else",
"end",
"if",
"range",
"nil",
"template",
"with",
// from the Go standard library: src/text/template/funcs.go
"and",
"call",
"html",
"index",
"slice",
"js",
"len",
"not",
"or",
"print",
"printf",
"println",
"urlquery",
"eq",
"ge",
"gt",
"le",
"lt",
"ne",
}
func Terms() []string {
var s []string
t := reflect.TypeOf((*models.TemplateData)(nil)).Elem()
for i := 0; i < t.NumMethod(); i++ {
s = append(s, "."+t.Method(i).Name)
}
for fnStr := range templateFuncs {
s = append(s, fnStr)
}
s = append(s, builtins...)
return s
}
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