print verbose output of redshift

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 105 insertions, 0 deletions

diff --git a/nightshift.py b/nightshift.py
new file mode 100755
index 0000000..24f161f
--- /dev/null
+++ b/nightshift.py
@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+# -*- python -*-
+copyright='''
+Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+
+This program 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.
+
+This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+'''
+
+import os
+import sys
+import threading
+from subprocess import Popen, PIPE
+
+
+PROGRAM_NAME = 'nightshift'
+PROGRAM_VERSION = '1.0'
+
+
+for arg in sys.argv[1:]:
+    if arg in ('-v', '--version'):
+        print('%s %s' % (PROGRAM_NAME, PROGRAM_VERSION))
+        Popen(['redshift', '-V'], stdout = sys.stdout).wait()
+        sys.exit(0)
+    elif arg in ('-c', '--copyright'):
+        print(copyright[1 : -1])
+        sys.exit(0)
+    elif arg in ('-w', '--warranty'):
+        print(copyright.split('\n\n')[-2])
+        sys.exit(0)
+    elif arg in ('-h', '--help'):
+        text = '''USAGE: nightshift
+                  
+                  terminal user interface for redshift, a program for
+                  setting the colour temperature of the display according
+                  to the time of day.
+                  
+                    -h --help        Display this help message
+                    -v --version     Show program version
+                    -c --copyright   Show program copyright information
+                    -w --warranty    Show program warrantly disclaimer
+                  
+                  Please report bugs to
+                  <https://github.com/maandree/nightshift/issues>
+               '''
+        text = text.split('\n')[:-1]
+        indent = min([len(line) - len(line.lstrip()) for line in text if line.rstrip().startswith(' ')])
+        print('\n'.join([line[indent:] if line.startswith(' ') else line for line in text]))
+        sys.exit(0)
+    else:
+        sys.stderr.write('%s: error: unrecognised option: %s\n' % (sys.argv[0], arg))
+        sys.exit(1)
+
+proc = Popen(['redshift', '-v'], stdout = PIPE, stderr = open(os.devnull))
+red_brightness, red_period, red_temperature, red_running = 1, 1, 6500, True
+red_condition = threading.Condition()
+
+def read_status():
+    global red_brightness, red_period, red_temperature, red_running
+    while True:
+        got = proc.stdout.readline()
+        if (got is None) or (len(got) == 0):
+            break
+        got = got.decode('utf-8', 'replace')[:-1]
+        (key, value) = got.split(': ')
+        red_condition.acquire()
+        try:
+            if key == 'Brightness':
+                red_brightness = float(value)
+            elif key == 'Period':
+                if value == 'Night':
+                    red_period = 0
+                elif value == 'Daytime':
+                    red_period = 1
+                else:
+                    red_period = float(value.split(' ')[1][1 : -1]) / 100
+            elif key == 'Color temperature':
+                red_temperature = float(value[:-1])
+        except:
+            pass
+        red_condition.notify()
+        red_condition.release()
+    red_running = False
+
+thread = threading.Thread(target = read_status)
+thread.setDaemon(True)
+thread.start()
+
+
+while red_running:
+    red_condition.acquire()
+    red_condition.wait()
+    print('%f: %f, %f' % (red_period, red_temperature, red_brightness))
+    red_condition.release()
+