init: pristine aerc 0.20.0 source

lib/templates/template.go

@@ -0,0 +1,105 @@
+package templates
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"text/template"
+
+	"git.sr.ht/~rjarry/aerc/lib/xdg"
+	"git.sr.ht/~rjarry/aerc/models"
+)
+
+func findTemplate(templateName string, templateDirs []string) (string, error) {
+	for _, dir := range templateDirs {
+		templateFile := xdg.ExpandHome(dir, templateName)
+		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
+}