Add support for -t get/? and transition from applied temperature when starting1.2

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 31 insertions, 0 deletions

diff --git a/README b/README
index 5ecfe2e..8b820f5 100644
--- a/README
+++ b/README
@@ -94,11 +94,42 @@ OPTIONS
 	-t temperature
 		Colour temperature, in Kelvins, to apply.
 
+		If temperature is '?' or 'get', the utility will print the
+		currently applied temperature.
+
 	-x
 		Remove the currently applied filter.
 
 OPERANDS
 	No operands are supported.
 
+SIGNALS
+	The following signals have non-default meaning:
+
+	SIGINT
+		Gradually fade out the effect and terminate the process.
+
+		If the fade out time is 0 (default) or if the signal is sent
+		twice, the effect is removed immediately.
+
+	SIGHUP
+		Terminate the process after any current fade in or fade out
+		action, but leaf the effect in place.
+
+	SIGUSR1
+		Gradually fade out the effect but do not terminate the process.
+
+		If the fade out time is 0 (default) or if the signal is sent
+		twice, the effect is removed immediately.
+
+	SIGUSR2
+		Gradually fade the effect back in (from SIGUSR1).
+
+		If the fade in time is 0 (default) or if the signal is sent
+		twice, the effect is restored immediately.
+
+		If sent during the initial fade in, the fade in is cancelled
+		and the full effect is immediately applied.
+
 SEE ALSO
 	coopgammad(1), cg-tools(7), redshift(1), blueshift(1)