1 #!/usr/bin/env python
2
3 # Copyright 2003 Tom Rothamel <tom-potw@rothamel.us>
4 #
5 # Permission is hereby granted, free of charge, to any person
6 # obtaining a copy of this software and associated documentation files
7 # (the "Software"), to deal in the Software without restriction,
8 # including without limitation the rights to use, copy, modify, merge,
9 # publish, distribute, sublicense, and/or sell copies of the Software,
10 # and to permit persons to whom the Software is furnished to do so,
11 # subject to the following conditions:
12 #
13 # The above copyright notice and this permission notice shall be
14 # included in all copies or substantial portions of the Software.
15 #
16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23
24 import curses
25 import optparse
26 import time
27
28 digits = {
29 ':' : ( ':', ':', ':', ':' ),
30 ' ' : ( ' ', ' ', ' ', ' ' ),
31
32 '0' : ( '.', '.', '.', '.' ),
33 '1' : ( '.', '.', '.', 'O' ),
34 '2' : ( '.', '.', 'O', '.' ),
35 '3' : ( '.', '.', 'O', 'O' ),
36 '4' : ( '.', 'O', '.', '.' ),
37 '5' : ( '.', 'O', '.', 'O' ),
38 '6' : ( '.', 'O', 'O', '.' ),
39 '7' : ( '.', 'O', 'O', 'O' ),
40 '8' : ( 'O', '.', '.', '.' ),
41 '9' : ( 'O', '.', '.', 'O' ),
42 }
43
44 def bcdtime():
45 """
46 This returns four strings, which together comprise the BCD
47 representation of the current time. The first string contains the
48 most significant bits of the numbers, with the fourth containing
49 the least significant bits.
50 """
51
52 st = time.strftime("%02H : %02M : %02S")
53
54 rv = []
55
56 # For each bit-place, from MSB to LSB
57 for i in range(0, 4):
58 rs = ""
59
60 # For each place in the current time.
61 for c in st:
62 rs += digits[c][i]
63
64 rv.append(rs)
65
66 return rv
67
68
69 def curses_clock():
70 """
71 This displays a binary-coded-decimal clock in a terminal, using
72 curses. The display updates every second.
73 """
74
75 scr = curses.initscr()
76
77 # We put everything to do with curses in a try block, so that if
78 # an error occurs, we call endwin() before displaying the
79 # traceback.
80
81 try:
82 # We only wait for input for a maximum of 1 second, or 10/10
83 # seconds as specified here.
84 curses.halfdelay(10)
85 curses.noecho()
86
87 while True:
88
89 # Show the BCDtime.
90 lines = bcdtime()
91
92 for i, l in enumerate(lines):
93 scr.addstr(i, 0, l)
94
95 # Move the cursor out of the way.
96 maxy, maxx = scr.getmaxyx()
97 scr.move(maxy - 1, maxx - 1)
98 scr.refresh()
99
100 # If we get 'Q', quit. This can take up to 1 second.
101 c = scr.getch()
102 if c == ord('q') or c == ord('Q'):
103 break
104
105 finally:
106 curses.endwin()
107
108
109 def main():
110 op = optparse.OptionParser(usage="bcd.py [options]",
111 version="bcd.py 1")
112
113 op.add_option("--single", action="store_true", dest="single",
114 default=False,
115 help="Print out the current time, then quit.")
116
117 options, args = op.parse_args()
118
119 # If single, print out the current bcdtime, and exit.
120 if options.single:
121 for l in bcdtime():
122 print l
123
124 return
125
126 curses_clock()
127
128 if __name__ == "__main__":
129 main()
130
131
132
133