[tracker] libtracker-data: Add SparqlEncodeForUri sqlite function

[Carlos Garnacho <carlosg src gnome org>]

commit 9041399e4c51508c6770d4ed26a0990e63105a64
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 28 22:03:10 2015 +0200

    libtracker-data: Add SparqlEncodeForUri sqlite function
    
    This will be used on ENCODE_FOR_URI(), as per sparql 1.1.

 src/libtracker-data/tracker-db-interface-sqlite.c |   22 +++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-db-interface-sqlite.c 
b/src/libtracker-data/tracker-db-interface-sqlite.c
index a1d4d83..01fc19d 100644
--- a/src/libtracker-data/tracker-db-interface-sqlite.c
+++ b/src/libtracker-data/tracker-db-interface-sqlite.c
@@ -883,6 +883,24 @@ function_sparql_unaccent (sqlite3_context *context,
 
 #endif
 
+static void
+function_sparql_encode_for_uri (sqlite3_context *context,
+                                int              argc,
+                                sqlite3_value   *argv[])
+{
+       const gchar *str;
+       gchar *encoded;
+
+       if (argc != 1) {
+               sqlite3_result_error (context, "Invalid argument count", -1);
+               return;
+       }
+
+       str = sqlite3_value_text (argv[0]);
+       encoded = g_uri_escape_string (str, NULL, FALSE);
+       sqlite3_result_text (context, encoded, -1, g_free);
+}
+
 static inline int
 stmt_step (sqlite3_stmt *stmt)
 {
@@ -1006,6 +1024,10 @@ open_database (TrackerDBInterface  *db_interface,
                                 db_interface, &function_sparql_format_time,
                                 NULL, NULL);
 
+       sqlite3_create_function (db_interface->db, "SparqlEncodeForUri", 1, SQLITE_ANY,
+                                db_interface, &function_sparql_encode_for_uri,
+                                NULL, NULL);
+
        sqlite3_extended_result_codes (db_interface->db, 0);
        sqlite3_busy_timeout (db_interface->db, 100000);
 }