twitch-bot/msgformatter.go

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package main
import (
"bytes"
"regexp"
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"text/template"
"time"
"github.com/go-irc/irc"
"github.com/pkg/errors"
"github.com/Luzifer/twitch-bot/plugins"
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)
var (
// Compile-time assertion
_ plugins.MsgFormatter = formatMessage
stripNewline = regexp.MustCompile(`(?m)\s*\n\s*`)
formatMessageFieldSetters = []func(compiledFields *plugins.FieldCollection, m *irc.Message, fields *plugins.FieldCollection){
formatMessageFieldChannel,
formatMessageFieldMessage,
formatMessageFieldUserID,
formatMessageFieldUsername,
}
)
func formatMessage(tplString string, m *irc.Message, r *plugins.Rule, fields *plugins.FieldCollection) (string, error) {
compiledFields := plugins.NewFieldCollection()
if config != nil {
configLock.RLock()
compiledFields.SetFromData(config.Variables)
compiledFields.Set("permitTimeout", int64(config.PermitTimeout/time.Second))
configLock.RUnlock()
}
compiledFields.SetFromData(fields.Data())
for _, fn := range formatMessageFieldSetters {
fn(compiledFields, m, fields)
}
// Template in frontend supports newlines, messages do not
tplString = stripNewline.ReplaceAllString(tplString, " ")
// Parse and execute template
tpl, err := template.
New(tplString).
Funcs(tplFuncs.GetFuncMap(m, r, compiledFields)).
Parse(tplString)
if err != nil {
return "", errors.Wrap(err, "parse template")
}
buf := new(bytes.Buffer)
err = tpl.Execute(buf, compiledFields.Data())
return buf.String(), errors.Wrap(err, "execute template")
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}
func formatMessageFieldChannel(compiledFields *plugins.FieldCollection, m *irc.Message, fields *plugins.FieldCollection) {
compiledFields.Set(eventFieldChannel, plugins.DeriveChannel(m, fields))
}
func formatMessageFieldMessage(compiledFields *plugins.FieldCollection, m *irc.Message, fields *plugins.FieldCollection) {
if m == nil {
return
}
compiledFields.Set("msg", m)
}
func formatMessageFieldUserID(compiledFields *plugins.FieldCollection, m *irc.Message, fields *plugins.FieldCollection) {
if m == nil {
return
}
if uid := m.Tags["user-id"]; uid != "" {
compiledFields.Set(eventFieldUserID, uid)
}
}
func formatMessageFieldUsername(compiledFields *plugins.FieldCollection, m *irc.Message, fields *plugins.FieldCollection) {
compiledFields.Set("username", plugins.DeriveUser(m, fields))
}