Refactor wins_launch_external()

* Do window preparation and restoring in separate functions
  wins_prepare_external() and wins_unprepare_external().

* Use fork_exec() and child_wait() instead of system().

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/calcurse.h b/src/calcurse.h
index 14becbd..5c5c6d6 100644
--- a/src/calcurse.h
+++ b/src/calcurse.h
@@ -935,7 +935,9 @@ void      wins_update_border (void);
 void      wins_update_panels (void);
 void      wins_update (void);
 void      wins_reset (void);
-void      wins_launch_external (const char *, const char *);
+void      wins_prepare_external (void);
+void      wins_unprepare_external (void);
+void      wins_launch_external (char *, char *);
 void      wins_status_bar (void);
 void      wins_erase_status_bar (void);
 void      wins_other_status_page (int);