1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
#!/usr/bin/env python
"""
Clone of the standard UNIX "cat" command.
This example shows how you can utilize some of the buitlin I/O components
in circuits to write a very simple clone of the standard UNIX "cat" command.
"""
import sys
from circuits.io import File, stdout, write
class Cat(File):
# This adds the already instantiated stdout instnace
stdout = stdout
def read(self, data):
"""
Read Event Handler
This is fired by the File Component when there is data to be read
from the underlying file that was opened.
"""
self.fire(write(data), stdout)
def eof(self):
"""
End Of File Event
This is fired by the File Component when the underlying input file
has been exhcuasted.
"""
raise SystemExit(0)
# Start and "run" the system.
Cat(sys.argv[1]).run()
|
