lib: regexp matching in 'subject' and 'from'

the idea is that you can run

% notmuch search subject:/<your-favourite-regexp>/
% notmuch search from:/<your-favourite-regexp>/

or

% notmuch search subject:"your usual phrase search"
% notmuch search from:"usual phrase search"

This feature is only available with recent Xapian, specifically
support for field processors is needed.

It should work with bindings, since it extends the query parser.

This is easy to extend for other value slots, but currently the only
value slots are date, message_id, from, subject, and last_mod. Date is
already searchable;  message_id is left for a followup commit.

This was originally written by Austin Clements, and ported to Xapian
field processors (from Austin's custom query parser) by yours truly.

1 files changed, 82 insertions, 0 deletions

diff --git a/test/T650-regexp-query.sh b/test/T650-regexp-query.sh
new file mode 100755
index 00000000..a8039610
--- /dev/null
+++ b/test/T650-regexp-query.sh
@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+test_description='regular expression searches'
+. ./test-lib.sh || exit 1
+
+add_email_corpus
+
+
+if [ $NOTMUCH_HAVE_XAPIAN_FIELD_PROCESSOR -eq 0 ]; then
+    test_done
+fi
+
+notmuch search --output=messages from:cworth > cworth.msg-ids
+
+test_begin_subtest "regexp from search, case sensitive"
+notmuch search --output=messages from:/carl/ > OUTPUT
+test_expect_equal_file /dev/null OUTPUT
+
+test_begin_subtest "empty regexp or query"
+notmuch search --output=messages from:/carl/ or from:/cworth/ > OUTPUT
+test_expect_equal_file cworth.msg-ids OUTPUT
+
+test_begin_subtest "non-empty regexp and query"
+notmuch search  from:/cworth@cworth.org/ and subject:patch | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2009-11-18 [1/2] Carl Worth| Alex Botero-Lowry; [notmuch] [PATCH] Error out if no query is supplied to search instead of going into an infinite loop (attachment inbox unread)
+thread:XXX   2009-11-18 [1/2] Carl Worth| Ingmar Vanhassel; [notmuch] [PATCH] Typsos (inbox unread)
+thread:XXX   2009-11-18 [1/2] Carl Worth| Jan Janak; [notmuch] [PATCH] Older versions of install do not support -C. (inbox unread)
+thread:XXX   2009-11-18 [1/2] Carl Worth| Keith Packard; [notmuch] [PATCH] Make notmuch-show 'X' (and 'x') commands remove inbox (and unread) tags (inbox unread)
+thread:XXX   2009-11-18 [2/5] Carl Worth| Mikhail Gusarov, Keith Packard; [notmuch] [PATCH 1/2] Close message file after parsing message headers (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "regexp from search, duplicate term search"
+notmuch search --output=messages from:/cworth/ > OUTPUT
+test_expect_equal_file cworth.msg-ids OUTPUT
+
+test_begin_subtest "long enough regexp matches only desired senders"
+notmuch search --output=messages 'from:"/C.* Wo/"' > OUTPUT
+test_expect_equal_file cworth.msg-ids OUTPUT
+
+test_begin_subtest "shorter regexp matches one more sender"
+notmuch search --output=messages 'from:"/C.* W/"' > OUTPUT
+{ echo id:1258544095-16616-1-git-send-email-chris@chris-wilson.co.uk; cat cworth.msg-ids; } > EXPECTED
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "regexp subject search, non-ASCII"
+notmuch search --output=messages subject:/accentué/ > OUTPUT
+echo id:877h1wv7mg.fsf@inf-8657.int-evry.fr > EXPECTED
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "regexp subject search, punctuation"
+notmuch search subject:/\'X\'/ | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2009-11-18 [2/2] Keith Packard, Carl Worth; [notmuch] [PATCH] Make notmuch-show 'X' (and 'x') commands remove inbox (and unread) tags (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "regexp subject search, no punctuation"
+notmuch search  subject:/X/ | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2009-11-18 [2/2] Keith Packard, Carl Worth; [notmuch] [PATCH] Make notmuch-show 'X' (and 'x') commands remove inbox (and unread) tags (inbox unread)
+thread:XXX   2009-11-18 [4/4] Jjgod Jiang, Alexander Botero-Lowry; [notmuch] Mac OS X/Darwin compatibility issues (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "combine regexp from and subject"
+notmuch search  subject:/-C/ and from:/.an.k/ | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2009-11-17 [1/2] Jan Janak| Carl Worth; [notmuch] [PATCH] Older versions of install do not support -C. (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "regexp error reporting"
+notmuch search 'from:/unbalanced[/' 1>OUTPUT 2>&1
+cat <<EOF > EXPECTED
+notmuch search: A Xapian exception occurred
+A Xapian exception occurred performing query: Invalid regular expression
+Query string was: from:/unbalanced[/
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_done