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+# -*- python -*-
+
+# This example demonstrates how the currents settings
+# can be read and transitioned from.
+
+
+uses_adhoc_opts = True
+'''
+:bool `True` if the configuration script parses the ad-hoc settings
+'''
+
+
+# Get --temperature from Blueshift ad-hoc settigns
+temperature_to = int(parser.opts['--temperature'][0])
+
+
+# Get current colour curves
+randr_get(0)()
+r_, g_, b_ = r_curve[:], g_curve[:], b_curve[:]
+start_over()
+
+
+# Calculate divergence
+temperature(temperature_to, lambda t : divide_by_maximum(cmf_10deg(t)))
+f = lambda xy : abs(xy[0] - xy[1])
+divergence = max([max(map(f, zip(x, y))) for x, y in curves(r_, g_, b_)])
+
+
+# Get the end state colour curves
+r, g, b = r_curve[:], g_curve[:], b_curve[:]
+
+
+# Calculate transition time
+fadein_time = divergence * 5
+fadein_steps = fadein_time * 10
+
+# Function for setting the colour temperature
+def adjust(alpha):
+ f = lambda on : on[0] * (1 - alpha) + on[1] * alpha
+ ccc = curves((r_, r), (g_, g), (b_, b))
+ ccc = [(out, list(map(f, zip(old, new)))) for out, (old, new) in ccc]
+ for out, curve in ccc:
+ out[:] = curve
+ randr(0)
+
+# Perform transition
+if divergence and not panicgate:
+ signal.signal(signal.SIGTERM, signal_SIGTERM)
+ dtime = fadein_time / fadein_steps
+ df = 1 / fadein_steps
+ trans = 0
+ while running:
+ try:
+ trans += df
+ if trans > 1:
+ break
+ adjust(trans)
+ time.sleep(dtime)
+ except KeyboardInterrupt:
+ running = False
+adjust(1)
+