[gnome-games] utils: Fix options injection with custom filename

[Adrien Plazas <aplazas src gnome org>]

commit f75e2bed9315621da7ced69219d20b7b3d75a0d6
Author: Michael Scherer <misc redhat com>
Date:   Mon May 22 14:54:48 2017 +0200

    utils: Fix options injection with custom filename
    
    If a filename start by '--', grep would assume this is a option,
    and so would potentially either miss the file, or wait
    until STDIN is closed. A quick look at grep manpage do not
    yield any way to execute code with this for now, but it is
    better to fix the problem for now.
    
    Using '--' is the traditional way to deal with file using
    a double dash prefix.
    
    Fix https://bugzilla.gnome.org/show_bug.cgi?id=782952

 src/utils/grep.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/utils/grep.vala b/src/utils/grep.vala
index f6f93e3..21a66ad 100644
--- a/src/utils/grep.vala
+++ b/src/utils/grep.vala
@@ -3,7 +3,7 @@
 namespace Games.Grep {
        public size_t[] get_offsets (string filename, string text) {
                var working_dir = Environment.get_current_dir ();
-               string[] args = { "grep", "--byte-offset", "--only-matching", "--text", text, filename };
+               string[] args = { "grep", "--byte-offset", "--only-matching", "--text", text, "--", filename 
};
                var env = Environ.@get ();
 
                bool success = false;