redshift: Add hooks for user actions on period switch

Hooks are executable scripts in ~/.config/redshift/hooks/ that
are run when a certain event happens. The first parameter to the
script indicates the event and further parameters may indicate
more details about the event.

The event "period-changed" is indicated when the period changes
("night", "daytime", "transition"). The second parameter is the old
period and the third is the new period. The event is signaled when
Redshift starts up with the old period set to "none".

1 files changed, 29 insertions, 0 deletions

diff --git a/src/hooks.h b/src/hooks.h
new file mode 100644
index 0000000..fd1c2f0
--- /dev/null
+++ b/src/hooks.h
@@ -0,0 +1,29 @@
+/* hooks.h -- Hooks triggered by events
+   This file is part of Redshift.
+
+   Redshift is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Redshift is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Redshift.  If not, see <http://www.gnu.org/licenses/>.
+
+   Copyright (c) 2014  Jon Lund Steffensen <jonlst@gmail.com>
+*/
+
+#ifndef REDSHIFT_HOOKS_H
+#define REDSHIFT_HOOKS_H
+
+#include "redshift.h"
+
+void hooks_signal_period_change(period_t prev_period,
+				period_t period);
+
+
+#endif /* ! REDSHIFT_HOOKS_H */