lib: add thread subqueries.

This change allows queries of the form

 thread:{from:me} and thread:{from:jian} and not thread:{from:dave}

This is still somewhat brute-force, but it's a big improvement over
both the shell script solution and the previous proposal [1], because it
does not build the whole thread structure just generate a
query. A further potential optimization is to replace the calls to
notmuch with more specialized Xapian code; in particular it's not
likely that reading all of the message metadata is a win here.

[1]: id:20170820213240.20526-1-david@tethera.net

diff --git a/lib/Makefile.local b/lib/Makefile.local
index 8aa03891d775b7591e3f67a5a66fe8cd9c98ca9b..5dc057c090133b5c4be9647635a623188eeff6d2 100644 (file)
--- a/lib/Makefile.local
+++ b/lib/Makefile.local
@@ -58,7 +58,8 @@ libnotmuch_cxx_srcs =         \
        $(dir)/query-fp.cc      \
        $(dir)/config.cc        \
        $(dir)/regexp-fields.cc \
-       $(dir)/thread.cc
+       $(dir)/thread.cc \
+       $(dir)/thread-fp.cc
 
 libnotmuch_modules := $(libnotmuch_c_srcs:.c=.o) $(libnotmuch_cxx_srcs:.cc=.o)
 

diff --git a/lib/database.cc b/lib/database.cc
index 02444e09e965c4ce0dbc396d5ed48b5abce5ba0a..9cf8062cbe7caa2c5f7ecd714ca934c7f96b1e76 100644 (file)
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -21,6 +21,7 @@
 #include "database-private.h"
 #include "parse-time-vrp.h"
 #include "query-fp.h"
+#include "thread-fp.h"
 #include "regexp-fields.h"
 #include "string-util.h"
 
@@ -258,7 +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 },
-    { "thread",                        "G",            NOTMUCH_FIELD_EXTERNAL },
+    { "thread",                        "G",            NOTMUCH_FIELD_EXTERNAL |
+                                               NOTMUCH_FIELD_PROCESSOR },
     { "tag",                   "K",            NOTMUCH_FIELD_EXTERNAL |
                                                NOTMUCH_FIELD_PROCESSOR },
     { "is",                    "K",            NOTMUCH_FIELD_EXTERNAL |
@@ -317,6 +319,8 @@ _setup_query_field (const prefix_t *prefix, notmuch_database_t *notmuch)
            fp = (new DateFieldProcessor())->release ();
        else if (STRNCMP_LITERAL(prefix->name, "query") == 0)
            fp = (new QueryFieldProcessor (*notmuch->query_parser, notmuch))->release ();
+       else if (STRNCMP_LITERAL(prefix->name, "thread") == 0)
+           fp = (new ThreadFieldProcessor (*notmuch->query_parser, notmuch))->release ();
        else
            fp = (new RegexpFieldProcessor (prefix->name, prefix->flags,
                                            *notmuch->query_parser, notmuch))->release ();

diff --git a/lib/thread-fp.cc b/lib/thread-fp.cc
new file mode 100644 (file)
index 0000000..1ab2ae3
--- /dev/null
+++ b/lib/thread-fp.cc
@@ -0,0 +1,68 @@
+/* thread-fp.cc - "thread:" field processor glue
+ *
+ * This file is part of notmuch.
+ *
+ * Copyright © 2017 David Bremner
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/ .
+ *
+ * Author: David Bremner <david@tethera.net>
+ */
+
+#include "database-private.h"
+#include "thread-fp.h"
+#include <iostream>
+
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+
+Xapian::Query
+ThreadFieldProcessor::operator() (const std::string & str)
+{
+    notmuch_status_t status;
+
+    if (str.at (0) == '{') {
+       if (str.length() > 1 && str.at (str.size () - 1) == '}'){
+           std::string subquery_str = str.substr(1,str.size () - 2);
+           notmuch_query_t *subquery = notmuch_query_create (notmuch, subquery_str.c_str());
+           notmuch_messages_t *messages;
+           std::set<std::string> terms;
+
+           if (!subquery)
+               throw Xapian::QueryParserError ("failed to create subquery for '" + subquery_str + "'");
+
+
+           status = notmuch_query_search_messages (subquery, &messages);
+           if (status)
+               throw Xapian::QueryParserError ("failed to search messages for '" + subquery_str + "'");
+
+
+           for (; notmuch_messages_valid (messages);  notmuch_messages_move_to_next (messages)) {
+               std::string term = "G";
+               notmuch_message_t *message;
+               message = notmuch_messages_get (messages);
+               term += notmuch_message_get_thread_id (message);
+               terms.insert (term);
+           }
+           return Xapian::Query (Xapian::Query::OP_OR, terms.begin(), terms.end());
+       } else {
+           throw Xapian::QueryParserError ("missing } in '" + str + "'");
+       }
+    } else {
+       /* literal thread id */
+       std::string term = "G"+str;
+       return Xapian::Query (term);
+    }
+
+}
+#endif

diff --git a/lib/thread-fp.h b/lib/thread-fp.h
new file mode 100644 (file)
index 0000000..1372597
--- /dev/null
+++ b/lib/thread-fp.h
@@ -0,0 +1,42 @@
+/* thread-fp.h - thread field processor glue
+ *
+ * This file is part of notmuch.
+ *
+ * Copyright © 2017 David Bremner
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/ .
+ *
+ * Author: David Bremner <david@tethera.net>
+ */
+
+#ifndef NOTMUCH_THREAD_FP_H
+#define NOTMUCH_THREAD_FP_H
+
+#include <xapian.h>
+#include "notmuch.h"
+
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+class ThreadFieldProcessor : public Xapian::FieldProcessor {
+ protected:
+    Xapian::QueryParser &parser;
+    notmuch_database_t *notmuch;
+
+ public:
+    ThreadFieldProcessor (Xapian::QueryParser &parser_, notmuch_database_t *notmuch_)
+       : parser(parser_), notmuch(notmuch_) { };
+
+    Xapian::Query operator()(const std::string & str);
+};
+#endif
+#endif /* NOTMUCH_THREAD_FP_H */