1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
package templates
import (
"bytes"
"errors"
"net/mail"
"os"
"path"
"strings"
"text/template"
"time"
"github.com/mitchellh/go-homedir"
)
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
}
func TestTemplateData() TemplateData {
defaults := map[string]string{
"To": "John Doe <john@example.com>",
"Cc": "Josh Doe <josh@example.com>",
"From": "Jane Smith <jane@example.com>",
"Subject": "This is only a test",
"OriginalText": "This is only a test text",
"OriginalFrom": "John Doe <john@example.com>",
"OriginalDate": time.Now().Format("Mon Jan 2, 2006 at 3:04 PM"),
}
return ParseTemplateData(defaults)
}
func ParseTemplateData(defaults map[string]string) TemplateData {
originalDate, _ := time.Parse("Mon Jan 2, 2006 at 3:04 PM", defaults["OriginalDate"])
td := TemplateData{
To: parseAddressList(defaults["To"]),
Cc: parseAddressList(defaults["Cc"]),
Bcc: parseAddressList(defaults["Bcc"]),
From: parseAddressList(defaults["From"]),
Date: time.Now(),
Subject: defaults["Subject"],
OriginalText: defaults["Original"],
OriginalFrom: parseAddressList(defaults["OriginalFrom"]),
OriginalDate: originalDate,
}
return td
}
func parseAddressList(list string) []*mail.Address {
addrs, err := mail.ParseAddressList(list)
if err != nil {
return nil
}
return addrs
}
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")
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")
lines := strings.Split(text, "\n")
var quoted strings.Builder
for _, line := range lines {
if line == "" {
quoted.WriteString(">\n")
}
quoted.WriteString("> ")
quoted.WriteString(line)
quoted.WriteRune('\n')
}
return quoted.String()
}
var templateFuncs = template.FuncMap{
"quote": quote,
"wrapText": wrapText,
"dateFormat": time.Time.Format,
}
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 "", errors.New("Can't find template - " + templateName)
}
func ParseTemplateFromFile(templateName string, templateDirs []string, data interface{}) ([]byte, 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 outString bytes.Buffer
if err := emailTemplate.Execute(&outString, data); err != nil {
return nil, err
}
return outString.Bytes(), nil
}
func ParseTemplate(templateText string, data interface{}) ([]byte, error) {
emailTemplate, err :=
template.New("email_template").Funcs(templateFuncs).Parse(templateText)
if err != nil {
return nil, err
}
var outString bytes.Buffer
if err := emailTemplate.Execute(&outString, data); err != nil {
return nil, err
}
return outString.Bytes(), nil
}
|
