Anthony 24c3a1d908 Real IMAP SEARCH: parse the query and match per message ...

cmd_search only ever special-cased UNSEEN — every other query (SUBJECT,
FROM, SINCE, …) fell through to "return all message ids", so a search in
Thunderbird silently matched the entire mailbox. Now that the full mailbox
is listed, that made search actively misleading.

New imap/search.rs parses the RFC 3501 SEARCH grammar into a SearchKey
tree (AND/OR/NOT, parens, CHARSET prefix, quoted strings, sequence/UID
sets) and matches each message via a lightweight MsgView the session
projects from its cached mail. Coverage is metadata-first: SUBJECT, FROM,
TO, CC, BCC, HEADER, flags, dates (BEFORE/ON/SINCE + SENT*), LARGER/
SMALLER, UID and sequence sets. Flag predicates resolve consistently with
what we report over FETCH (only \Seen and \Deleted exist). BODY/TEXT match
the body only when it's already decoded — whole-mailbox full-text body
search is the next increment, backed by an on-disk index.

Unknown criteria degrade to a non-restrictive match so search never hides
a message.

Validated live on a 19,322-message INBOX: SEEN+UNSEEN partition the
mailbox exactly, NOT SEEN == UNSEEN, AND/OR compose, and a nonexistent
subject now returns 0 hits instead of everything. 223 unit tests.

2026-05-29 18:58:21 +02:00

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bridge

Real IMAP SEARCH: parse the query and match per message

2026-05-29 18:58:21 +02:00