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authorMattias Andrée <maandree@operamail.com>2014-03-31 00:59:11 +0200
committerMattias Andrée <maandree@operamail.com>2014-03-31 00:59:11 +0200
commitea08bce7e7cc57e78858e46712d33209f21066e8 (patch)
treed3c2e86c5b2495126c802b778e42fe68a5d085ea /src/__main__.py
parentm doc + do not override fadein_time or fadeout_time with None if fadein_steps or fadeout_steps, respectively, is non-positive (diff)
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document
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/__main__.py')
-rwxr-xr-xsrc/__main__.py29
1 files changed, 27 insertions, 2 deletions
diff --git a/src/__main__.py b/src/__main__.py
index 62829b6..49334e6 100755
--- a/src/__main__.py
+++ b/src/__main__.py
@@ -415,14 +415,26 @@ def continuous_run():
# from clean state.
trans_alpha = 1
+ ## Used to test if fading should still be used
with_fadein = lambda : (fadein_steps > 0) and (fadein_time is not None)
with_fadeout = lambda : (fadeout_steps > 0) and (fadeout_time is not None)
+ ## Run until we get a signal to exit
+ # When the program start we are fading in,
+ # than we run in normal periodical state.
+ # But if we get a SIGUSR2 signal we start
+ # fading out until we get another at which
+ # point we start fading in. When we get a
+ # SIGUSR2 we set `panicgate` to be false.
while running:
if trans_delta == 0:
## Run periodically
+ # Apply adjustments
p(now(), None)
+ # and, assuming that we should not exit,
if running:
+ # sleep for a time interval selected
+ # by the configuration script.
sleep(wait_period)
elif trans_delta < 0:
## Fade in
@@ -432,8 +444,7 @@ def continuous_run():
sleep(fadein_time / fadein_steps)
trans_alpha -= 1 / fadein_steps
if not (with_fadein() and not panicgate):
- trans_alpha = 0
- trans_delta = 0
+ trans_alpha = trans_delta = 0
p(now(), 1 - trans_alpha)
if with_fadein():
sleep(fadein_time / fadein_steps)
@@ -449,6 +460,7 @@ def continuous_run():
with sleep_condition:
sleep_condition.wait()
except KeyboardInterrupt:
+ # Emulate `kill -TERM` on Control+c
signal_SIGTERM(0, None)
else:
if with_fadeout():
@@ -456,14 +468,27 @@ def continuous_run():
## Fade out
if with_fadeout():
+ # If we should fade, fade will we have not got
+ # two SIGTERM signals or keyboard interrupts
while not panic:
+ # Step towards clean adjustments
trans_alpha += 1 / fadeout_steps
+ # If we have clean adjustments (or hyperclean),
if trans_alpha >= 1:
+ # set the adjustments to clean (in case they where hyperclean)
trans_alpha = 1
+ # and signal that want should stop after this stop.
panic = True
+ # Apply adjustments. If `trans_alpha` is 0, we have `fade = -1`
+ # which means that we are fading away from adjustements but are
+ # still at 100 % adjustments, moving towards `fade = 0` we are
+ # removing the adjustments gradually.
p(now(), -1 + trans_alpha)
+ # Stop if we should no longer fade,
if not with_fadeout():
break
+ # before we sleep. If we did not break
+ # would would run into errors.
sleep(fadeout_time / fadeout_steps)
## Reset