lib: Add regexp searching for mid: prefix

The bulk of the change is passing in the field options to the regexp
field processor, so that we can properly handle the
fallback (non-regexp case).

lib/database.cc

@@ -262,7 +262,8 @@ prefix_t prefix_table[] = {
     { "tag",			"K",		NOTMUCH_FIELD_EXTERNAL },
     { "is",			"K",		NOTMUCH_FIELD_EXTERNAL },
     { "id",			"Q",		NOTMUCH_FIELD_EXTERNAL },
-    { "mid",			"Q",		NOTMUCH_FIELD_EXTERNAL },
+    { "mid",			"Q",		NOTMUCH_FIELD_EXTERNAL |
+						NOTMUCH_FIELD_PROCESSOR },
     { "path",			"P",		NOTMUCH_FIELD_EXTERNAL },
     { "property",		"XPROPERTY",	NOTMUCH_FIELD_EXTERNAL },
     /*
@@ -313,7 +314,8 @@ _setup_query_field (const prefix_t *prefix, notmuch_database_t *notmuch)
 	else if (STRNCMP_LITERAL(prefix->name, "query") == 0)
 	    fp = (new QueryFieldProcessor (*notmuch->query_parser, notmuch))->release ();
 	else
-	    fp = (new RegexpFieldProcessor (prefix->name, *notmuch->query_parser, notmuch))->release ();
+	    fp = (new RegexpFieldProcessor (prefix->name, prefix->flags,
+					    *notmuch->query_parser, notmuch))->release ();
 
 	/* we treat all field-processor fields as boolean in order to get the raw input */
 	notmuch->query_parser->add_boolean_prefix (prefix->name, fp);

lib/regexp-fields.cc

@@ -135,13 +135,21 @@ static inline Xapian::valueno _find_slot (std::string prefix)
 	return NOTMUCH_VALUE_FROM;
     else if (prefix == "subject")
 	return NOTMUCH_VALUE_SUBJECT;
+    else if (prefix == "mid")
+	return NOTMUCH_VALUE_MESSAGE_ID;
     else
 	throw Xapian::QueryParserError ("unsupported regexp field '" + prefix + "'");
 }
 
-RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix, Xapian::QueryParser &parser_, notmuch_database_t *notmuch_)
+RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix,
-	: slot (_find_slot (prefix)), term_prefix (_find_prefix (prefix.c_str ())),
+					    notmuch_field_flag_t options_,
-	  parser (parser_), notmuch (notmuch_)
+					    Xapian::QueryParser &parser_,
+					    notmuch_database_t *notmuch_)
+	: slot (_find_slot (prefix)),
+	  term_prefix (_find_prefix (prefix.c_str ())),
+	  options (options_),
+	  parser (parser_),
+	  notmuch (notmuch_)
 {
 };
 
@@ -161,6 +169,7 @@ RegexpFieldProcessor::operator() (const std::string & str)
 	    throw Xapian::QueryParserError ("unmatched regex delimiter in '" + str + "'");
 	}
     } else {
+	if (options & NOTMUCH_FIELD_PROBABILISTIC) {
 	    /* TODO replace this with a nicer API level triggering of
 	     * phrase parsing, when possible */
 	    std::string query_str;
@@ -171,6 +180,11 @@ RegexpFieldProcessor::operator() (const std::string & str)
 		query_str = str;
 
 	    return parser.parse_query (query_str, NOTMUCH_QUERY_PARSER_FLAGS, term_prefix);
+	} else {
+	    /* Boolean prefix */
+	    std::string term = term_prefix + str;
+	    return Xapian::Query (term);
+	}
     }
 }
 #endif

lib/regexp-fields.h

@@ -65,11 +65,13 @@ class RegexpFieldProcessor : public Xapian::FieldProcessor {
  protected:
     Xapian::valueno slot;
     std::string term_prefix;
+    notmuch_field_flag_t options;
     Xapian::QueryParser &parser;
     notmuch_database_t *notmuch;
 
  public:
-    RegexpFieldProcessor (std::string prefix, Xapian::QueryParser &parser_, notmuch_database_t *notmuch_);
+    RegexpFieldProcessor (std::string prefix, notmuch_field_flag_t options,
+			  Xapian::QueryParser &parser_, notmuch_database_t *notmuch_);
 
     ~RegexpFieldProcessor () { };
 

test/T650-regexp-query.sh

@@ -104,4 +104,20 @@ Query string was: from:/unbalanced[/
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "empty mid search"
+notmuch search --output=messages mid:yoom > OUTPUT
+cp /dev/null EXPECTED
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "non-empty mid regex search"
+notmuch search --output=messages mid:/yoom/ > OUTPUT
+test_expect_equal_file cworth.msg-ids OUTPUT
+
+test_begin_subtest "combine regexp mid and subject"
+notmuch search  subject:/-C/ and mid:/y..m/ | notmuch_search_sanitize > OUTPUT
+cat <<EOF > EXPECTED
+thread:XXX   2009-11-18 [1/2] Carl Worth| Jan Janak; [notmuch] [PATCH] Older versions of install do not support -C. (inbox unread)
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_done