[PATCH] WIP: add searching by body:

[David Bremner <david@tethera.net>]

---
this basically impliments a suggestion of Olly Betts on IRC.

I don't _think_ it requires indexing, since the new queries work on the old database.

In principle this should result in smaller indexes and somewhat faster
indexing, as it doesn't add terms twice anymore.

 lib/database.cc   |  6 ++++++
 lib/message.cc    | 10 +++++-----
 test/T730-body.sh | 28 ++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 5 deletions(-)
 create mode 100755 test/T730-body.sh

diff --git a/lib/database.cc b/lib/database.cc
index 9cf8062c..27c2d042 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -259,6 +259,8 @@ prefix_t prefix_table[] = {
     { "directory",		"XDIRECTORY",	NOTMUCH_FIELD_NO_FLAGS },
     { "file-direntry",		"XFDIRENTRY",	NOTMUCH_FIELD_NO_FLAGS },
     { "directory-direntry",	"XDDIRENTRY",	NOTMUCH_FIELD_NO_FLAGS },
+    { "body",			"",		NOTMUCH_FIELD_EXTERNAL |
+						NOTMUCH_FIELD_PROBABILISTIC},
     { "thread",			"G",		NOTMUCH_FIELD_EXTERNAL |
 						NOTMUCH_FIELD_PROCESSOR },
     { "tag",			"K",		NOTMUCH_FIELD_EXTERNAL |
@@ -302,6 +304,8 @@ prefix_t prefix_table[] = {
 static void
 _setup_query_field_default (const prefix_t *prefix, notmuch_database_t *notmuch)
 {
+    if (prefix->prefix)
+	notmuch->query_parser->add_prefix("",prefix->prefix);
     if (prefix->flags & NOTMUCH_FIELD_PROBABILISTIC)
 	notmuch->query_parser->add_prefix (prefix->name, prefix->prefix);
     else
@@ -326,6 +330,8 @@ _setup_query_field (const prefix_t *prefix, notmuch_database_t *notmuch)
 					    *notmuch->query_parser, notmuch))->release ();
 
 	/* we treat all field-processor fields as boolean in order to get the raw input */
+	if (prefix->prefix)
+	    notmuch->query_parser->add_prefix("",prefix->prefix);
 	notmuch->query_parser->add_boolean_prefix (prefix->name, fp);
     } else {
 	_setup_query_field_default (prefix, notmuch);
diff --git a/lib/message.cc b/lib/message.cc
index 6f2f6345..64349f83 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -1443,13 +1443,13 @@ _notmuch_message_gen_terms (notmuch_message_t *message,
 	message->termpos = term_gen->get_termpos () + 100;
 
 	_notmuch_message_invalidate_metadata (message, prefix_name);
+    } else {
+	term_gen->set_termpos (message->termpos);
+	term_gen->index_text (text);
+	/* Create a term gap, as above. */
+	message->termpos = term_gen->get_termpos () + 100;
     }
 
-    term_gen->set_termpos (message->termpos);
-    term_gen->index_text (text);
-    /* Create a term gap, as above. */
-    message->termpos = term_gen->get_termpos () + 100;
-
     return NOTMUCH_PRIVATE_STATUS_SUCCESS;
 }
 
diff --git a/test/T730-body.sh b/test/T730-body.sh
new file mode 100755
index 00000000..8318f9af
--- /dev/null
+++ b/test/T730-body.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+test_description='search body'
+. $(dirname "$0")/test-lib.sh || exit 1
+
+add_message "[body]=thebody-1" "[subject]=subject-1"
+
+test_begin_subtest 'search with body: prefix'
+notmuch search body:thebody | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2001-01-05 [1/1] Notmuch Test Suite; subject-1 (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest 'search without body: prefix'
+notmuch search thebody | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2001-01-05 [1/1] Notmuch Test Suite; subject-1 (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest 'search with body: prefix for term only in subject'
+notmuch search body:subject | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+
+test_done
-- 
2.20.1