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package templates
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"path"
"strings"
"text/template"
"time"
"github.com/emersion/go-message/mail"
"git.sr.ht/~rjarry/aerc/models"
"github.com/mitchellh/go-homedir"
)
var version string
// SetVersion initializes the aerc version displayed in template functions
func SetVersion(v string) {
version = v
}
type TemplateData struct {
To []*mail.Address
Cc []*mail.Address
Bcc []*mail.Address
From []*mail.Address
Date time.Time
Subject string
// Only available when replying with a quote
OriginalText string
OriginalFrom []*mail.Address
OriginalDate time.Time
OriginalMIMEType string
}
func ParseTemplateData(h *mail.Header, original models.OriginalMail) TemplateData {
// we ignore errors as this shouldn't fail the sending / replying even if
// something is wrong with the message we reply to
to, _ := h.AddressList("to")
cc, _ := h.AddressList("cc")
bcc, _ := h.AddressList("bcc")
from, _ := h.AddressList("from")
subject, err := h.Text("subject")
if err != nil {
subject = h.Get("subject")
}
td := TemplateData{
To: to,
Cc: cc,
Bcc: bcc,
From: from,
Date: time.Now(),
Subject: subject,
OriginalText: original.Text,
OriginalDate: original.Date,
OriginalMIMEType: original.MIMEType,
}
if original.RFC822Headers != nil {
origFrom, _ := original.RFC822Headers.AddressList("from")
td.OriginalFrom = origFrom
}
return td
}
// wrap allows to chain wrapText
func wrap(lineWidth int, text string) string {
return wrapText(text, lineWidth)
}
func wrapLine(text string, lineWidth int) string {
words := strings.Fields(text)
if len(words) == 0 {
return text
}
var wrapped strings.Builder
wrapped.WriteString(words[0])
spaceLeft := lineWidth - wrapped.Len()
for _, word := range words[1:] {
if len(word)+1 > spaceLeft {
wrapped.WriteRune('\n')
wrapped.WriteString(word)
spaceLeft = lineWidth - len(word)
} else {
wrapped.WriteRune(' ')
wrapped.WriteString(word)
spaceLeft -= 1 + len(word)
}
}
return wrapped.String()
}
func wrapText(text string, lineWidth int) string {
text = strings.ReplaceAll(text, "\r\n", "\n")
text = strings.TrimRight(text, "\n")
lines := strings.Split(text, "\n")
var wrapped strings.Builder
for _, line := range lines {
switch {
case line == "":
// deliberately left blank
case line[0] == '>':
// leave quoted text alone
wrapped.WriteString(line)
default:
wrapped.WriteString(wrapLine(line, lineWidth))
}
wrapped.WriteRune('\n')
}
return wrapped.String()
}
// quote prepends "> " in front of every line in text
func quote(text string) string {
text = strings.ReplaceAll(text, "\r\n", "\n")
text = strings.TrimRight(text, "\n")
lines := strings.Split(text, "\n")
var quoted strings.Builder
for _, line := range lines {
if line == "" {
quoted.WriteString(">\n")
continue
}
quoted.WriteString("> ")
quoted.WriteString(line)
quoted.WriteRune('\n')
}
return quoted.String()
}
// cmd allow to parse reply by shell command
// text have to be passed by cmd param
// if there is error, original string is returned
func cmd(cmd, text string) string {
var out bytes.Buffer
c := exec.Command("sh", "-c", cmd)
c.Stdin = strings.NewReader(text)
c.Stdout = &out
err := c.Run()
if err != nil {
return text
}
return out.String()
}
func toLocal(t time.Time) time.Time {
return time.Time.In(t, time.Local)
}
var templateFuncs = template.FuncMap{
"quote": quote,
"wrapText": wrapText,
"wrap": wrap,
"dateFormat": time.Time.Format,
"toLocal": toLocal,
"exec": cmd,
"version": func() string { return version },
}
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)
}
// DummyData provides dummy data to test template validity
func DummyData() interface{} {
from := &mail.Address{
Name: "John Doe",
Address: "john@example.com",
}
to := &mail.Address{
Name: "Alice Doe",
Address: "alice@example.com",
}
h := &mail.Header{}
h.SetAddressList("from", []*mail.Address{from})
h.SetAddressList("to", []*mail.Address{to})
oh := &mail.Header{}
oh.SetAddressList("from", []*mail.Address{to})
oh.SetAddressList("to", []*mail.Address{from})
original := models.OriginalMail{
Date: time.Now(),
From: from.String(),
Text: "This is only a test text",
MIMEType: "text/plain",
RFC822Headers: oh,
}
return ParseTemplateData(h, original)
}
func ParseTemplateFromFile(templateName string, templateDirs []string, data interface{}) (io.Reader, error) {
templateFile, err := findTemplate(templateName, templateDirs)
if err != nil {
return nil, err
}
emailTemplate, err := template.New(templateName).
Funcs(templateFuncs).ParseFiles(templateFile)
if err != nil {
return nil, err
}
var body bytes.Buffer
if err := emailTemplate.Execute(&body, data); err != nil {
return nil, err
}
return &body, nil
}
func CheckTemplate(templateName string, templateDirs []string) error {
if templateName != "" {
_, err := ParseTemplateFromFile(templateName, templateDirs, DummyData())
return err
}
return nil
}
|
