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package parse
import (
"strings"
"git.sr.ht/~rjarry/aerc/log"
"github.com/emersion/go-message/mail"
)
// MsgIDList parses a list of message identifiers. It returns message
// identifiers without angle brackets. If the header field is missing,
// it returns nil.
//
// This can be used on In-Reply-To and References header fields.
// If the field does not conform to RFC 5322, fall back
// to greedily parsing a subsequence of the original field.
func MsgIDList(h *mail.Header, key string) []string {
l, err := h.MsgIDList(key)
if err == nil {
return l
}
log.Errorf("%s: %s", err, h.Get(key))
// Expensive, fix your peer's MUA instead!
var list []string
header := &mail.Header{Header: h.Header.Copy()}
value := header.Get(key)
for err != nil && len(value) > 0 {
// Skip parsed IDs
if len(l) > 0 {
last := "<" + l[len(l)-1] + ">"
value = value[strings.Index(value, last)+len(last):]
list = append(list, l...)
}
// Skip a character until some IDs can be parsed
value = value[1:]
header.Set(key, value)
l, err = header.MsgIDList(key)
}
return append(list, l...)
}
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