package parse import ( "strings" "git.sr.ht/~rjarry/aerc/lib/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...) }