[gnome-calculator] Support for solving gcalccmd cmdline argument (bgo#788872)

[Robert Roth <robertroth src gnome org>]

commit 0139ab3e56969de52656f21102157dc3c14cfcbb
Author: Robert Roth <robert roth off gmail com>
Date:   Wed Jan 24 00:24:47 2018 +0200

    Support for solving gcalccmd cmdline argument (bgo#788872)

 src/gcalccmd.vala |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/gcalccmd.vala b/src/gcalccmd.vala
index 88bf0b0..3bf6c45 100644
--- a/src/gcalccmd.vala
+++ b/src/gcalccmd.vala
@@ -63,6 +63,11 @@ public static int main (string[] args)
 
     result_serializer = new Serializer (DisplayFormat.AUTOMATIC, 10, 9);
 
+    if (args.length == 2) {
+        solve (args[1]);
+        return Posix.EXIT_SUCCESS;
+    }
+
     var buffer = new char[1024];
     while (true)
     {