aboutsummaryrefslogtreecommitdiff
path: root/lib/templates/template.go
blob: e19b5ae0fa31f7bc7a1d46d4a31c88c0df1edf94 (plain)
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
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
	}
	wrapped := words[0]
	spaceLeft := lineWidth - len(wrapped)
	for _, word := range words[1:] {
		if len(word)+1 > spaceLeft {
			wrapped += "\n" + word
			spaceLeft = lineWidth - len(word)
		} else {
			wrapped += " " + word
			spaceLeft -= 1 + len(word)
		}
	}

	return wrapped
}

func wrapText(text string, lineWidth int) string {
	text = strings.ReplaceAll(text, "\r\n", "\n")
	lines := strings.Split(text, "\n")
	var wrapped string

	for _, line := range lines {
		wrapped += wrapLine(line, lineWidth) + "\n"
	}
	return wrapped
}

// Wraping lines at 70 so that with the "> " of the quote it is under 72
func quote(text string) string {
	text = strings.ReplaceAll(text, "\r\n", "\n")

	quoted := "> " + wrapText(text, 70)
	quoted = strings.ReplaceAll(quoted, "\n", "\n> ")
	return quoted
}

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
}