lib: Add regexp expansion for for tags and paths

[notmuch] / lib / regexp-fields.cc

diff --git a/lib/regexp-fields.cc b/lib/regexp-fields.cc
index 7ae55e70016c1f5e26c8b3c47dc1a5a5624e5b2d..084bc8c019999cefe7b7d0dff01d27463d6cc4a7 100644 (file)
--- a/lib/regexp-fields.cc
+++ b/lib/regexp-fields.cc
@@ -138,7 +138,7 @@ static inline Xapian::valueno _find_slot (std::string prefix)
     else if (prefix == "mid")
        return NOTMUCH_VALUE_MESSAGE_ID;
     else
-       throw Xapian::QueryParserError ("unsupported regexp field '" + prefix + "'");
+       return Xapian::BAD_VALUENO;
 }
 
 RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix,
@@ -156,15 +156,35 @@ RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix,
 Xapian::Query
 RegexpFieldProcessor::operator() (const std::string & str)
 {
-    if (str.size () == 0)
-       return Xapian::Query(Xapian::Query::OP_AND_NOT,
+    if (str.empty ()) {
+       if (options & NOTMUCH_FIELD_PROBABILISTIC) {
+           return Xapian::Query(Xapian::Query::OP_AND_NOT,
                             Xapian::Query::MatchAll,
                             Xapian::Query (Xapian::Query::OP_WILDCARD, term_prefix));
+       } else {
+           return Xapian::Query (term_prefix);
+       }
+    }
 
     if (str.at (0) == '/') {
-       if (str.at (str.size () - 1) == '/'){
-           RegexpPostingSource *postings = new RegexpPostingSource (slot, str.substr(1,str.size () - 2));
-           return Xapian::Query (postings->release ());
+       if (str.length() > 1 && str.at (str.size () - 1) == '/'){
+           std::string regexp_str = str.substr(1,str.size () - 2);
+           if (slot != Xapian::BAD_VALUENO) {
+               RegexpPostingSource *postings = new RegexpPostingSource (slot, regexp_str);
+               return Xapian::Query (postings->release ());
+           } else {
+               std::vector<std::string> terms;
+               regex_t regexp;
+
+               compile_regex(regexp, regexp_str.c_str ());
+               for (Xapian::TermIterator it = notmuch->xapian_db->allterms_begin (term_prefix);
+                    it != notmuch->xapian_db->allterms_end (); ++it) {
+                   if (regexec (&regexp, (*it).c_str () + term_prefix.size(),
+                                0, NULL, 0) == 0)
+                       terms.push_back(*it);
+               }
+               return Xapian::Query (Xapian::Query::OP_OR, terms.begin(), terms.end());
+           }
        } else {
            throw Xapian::QueryParserError ("unmatched regex delimiter in '" + str + "'");
        }