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#!/usr/bin/env python
#
# Copyright (c) 2008, Bjoern B. Brandenburg <bbb [at] cs.unc.edu>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the copyright holder nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import sys
import os
import readline
HISTFILE = '.gsh_history'
EGREP = 'grep'
STD_ARGS = ['-n', '--color', '-P']
VERSION = "V0.1"
HELP = """
Enter a regular expression to display lines that match the entered expression.
Enter ^D or ^C at the prompt to terminate gsh. If a search produces too many
results, then you can enter ^C to abort the search and return to the search
prompt.
For example, enter 'foo' to display lines containing the string 'foo'.
"""
COLS = 80
class HistFile(object):
def __init__(self, file):
self.histfile = os.path.join(os.environ["HOME"], file)
try:
readline.read_history_file(self.histfile)
except IOError:
pass
def store(self):
try:
readline.write_history_file(self.histfile)
except IOError:
pass
def ulc(str):
ul(str, (COLS - len(str)) / 2)
def ul(str, offset = 0):
print "%s%s" % (' ' * offset, str)
print "%s%s" % (' ' * offset, '=' * len(str))
def grep(pattern, files):
args = [EGREP]
args.append(pattern)
args.extend(STD_ARGS)
args.extend(files)
args.append('/dev/null')
return os.spawnvp(os.P_WAIT, EGREP, args)
def main(args):
files = list(args)
del files[0]
if files == []:
files = ["-R", "."]
history = HistFile(HISTFILE)
try:
ulc("Simple Grep Shell %s" % VERSION)
print HELP
while True:
pattern = raw_input('>> ')
if pattern != '':
try:
grep(pattern, files)
except KeyboardInterrupt:
pass
except (EOFError, KeyboardInterrupt):
print 'Bye.'
history.store()
if __name__ == '__main__':
main(sys.argv)
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