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format.go
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format.go
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package slack
import (
"regexp"
"strings"
"github.com/nlopes/slack"
)
const linkRegexp = "<" +
// link type
"([@#!])?" +
// link
"([^>|]+)" +
// start of |label (optional)
"(?:\\|" +
// label
"([^>]+)" +
// end of label
")?>"
var keywords = map[string]interface{}{
"channel": nil,
"group": nil,
"everyone": nil,
"here": nil,
}
type formatter struct{ store Store }
func (f formatter) Format(msg *slack.MessageEvent) string {
return f.formatLinks(f.flatten(msg))
}
func (f formatter) formatLinks(in string) string {
r := regexp.MustCompile(linkRegexp)
text := replaceAllStringSubmatchFunc(r, in, func(match []string) string {
t, link, label := match[1], match[2], match[3]
switch t {
case "@":
if label != "" {
return "@" + label
}
if user, ok := f.store.UserByID(link); ok {
if user.RealName != "" {
return "@" + user.RealName
}
return "@" + user.Name
}
case "#":
if label != "" {
return "#" + label
}
if channel, ok := f.store.ChannelByID(link); ok {
return "#" + channel.Name
}
case "!":
if _, ok := keywords[link]; ok {
return "@" + link
}
if label != "" {
return label
}
return match[0]
default:
link = strings.Replace(link, "mailto:", "", 1)
if label != "" && strings.Contains(link, label) {
return label
}
return link
}
return ""
})
text = strings.Replace(text, "<", "<", -1)
text = strings.Replace(text, ">", ">", -1)
return strings.Replace(text, "&", "&", -1)
}
func (f formatter) flatten(m *slack.MessageEvent) string {
text := m.Text
for _, a := range m.Attachments {
text = text + "\n" + a.Fallback
}
return text
}