/usr/share/pyshared/hotwire/builtins/head.py is in hotwire 0.721-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | # This file is part of the Hotwire Shell project API.
# Copyright (C) 2007 Colin Walters <walters@verbum.org>
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
# THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import os,sys,pickle
from hotwire.fs import path_join, open_text_file
from hotwire.builtin import builtin_hotwire, InputStreamSchema
@builtin_hotwire(input=InputStreamSchema('any',optional=True),
options_passthrough=True,
idempotent=True)
def head(context, *files):
_("""Return a subset of items from start of input stream.""")
count = 10
countidx = -1
# Create a copy so we can delete from it safely
files = list(files)
for i,arg in enumerate(files):
if arg.startswith('-'):
count = int(arg[1:])
countidx = i
break
if countidx >= 0:
del files[countidx]
if context.input is not None:
for i,value in enumerate(context.input):
if i >= count:
break
yield value
for fpath in files:
fpath = path_join(context.cwd, fpath)
f = None
try:
f = open_text_file(fpath)
for i,line in enumerate(f):
if i>= count:
break
yield line
finally:
if f is not None:
f.close()
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