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cheat
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cheat
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#!/usr/bin/env python
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"""
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cheat.py -- cheat allows you to create and view interactive cheatsheets on the
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command-line. It was designed to help remind *nix system
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administrators of options for commands that they use frequently,
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but not frequently enough to remember.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import os
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import sys
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import argparse
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import subprocess
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from textwrap import dedent
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DEFAULT_CHEAT_DIR = os.environ.get('DEFAULT_CHEAT_DIR') or \
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os.path.join(os.path.expanduser('~'), '.cheat')
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USE_PYGMENTS = False
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# NOTE remove this check if it is confirmed to work on windows
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if os.name == 'posix' and 'CHEATCOLORS' in os.environ:
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try:
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from pygments import highlight
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from pygments.util import ClassNotFound
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from pygments.lexers import get_lexer_for_filename, TextLexer
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from pygments.formatters import TerminalFormatter
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USE_PYGMENTS = True
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except ImportError:
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pass
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def cheat_directories():
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"Assembles a list of directories containing cheatsheets."
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default_directories = [DEFAULT_CHEAT_DIR]
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try:
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import cheatsheets
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default_directories.append(cheatsheets.cheat_dir)
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except ImportError:
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pass
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default = [default_dir for default_dir in default_directories
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if os.path.isdir(default_dir)]
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if 'CHEATPATH' in os.environ and os.environ['CHEATPATH']:
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return [path for path in os.environ['CHEATPATH'].split(os.pathsep)
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if os.path.isdir(path)] + default
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else:
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return default
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def cheat_files(cheat_directories):
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"Assembles a dictionary of cheatsheets found in the above directories."
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cheats = {}
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for cheat_dir in reversed(cheat_directories):
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cheats.update(dict([(cheat, cheat_dir)
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for cheat in os.listdir(cheat_dir)
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if not cheat.startswith('.')
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and not cheat.startswith('__')]))
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return cheats
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def edit_cheatsheet(cheat, cheatsheets):
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"Creates or edits a cheatsheet"
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# Assert that the EDITOR environment variable is set and that at least 3
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# arguments have been given
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if 'EDITOR' not in os.environ:
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print('In order to use "create" or "edit" you must set your '
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'EDITOR environment variable to your favorite editor\'s path')
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exit()
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elif len(sys.argv) < 3:
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print('Must provide a cheatsheet to edit/create')
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exit()
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# if the cheatsheet already exists, open it for editing
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if cheat in cheatsheets:
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subprocess.call([os.environ['EDITOR'],
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os.path.join(cheatsheets[cheat], cheat)])
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# otherwise, create it
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else:
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import cheatsheets as cs
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# Attempt to write the new cheatsheet to the user's ~/.cheat dir if it
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# exists. If it does not exist, attempt to create it.
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if os.access(DEFAULT_CHEAT_DIR, os.W_OK) or os.makedirs(DEFAULT_CHEAT_DIR):
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subprocess.call([os.environ['EDITOR'],
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os.path.join(DEFAULT_CHEAT_DIR, cheat)])
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# If the directory cannot be created, write to the python package
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# directory, though that will likely require the use of sudo
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else:
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subprocess.call([os.environ['EDITOR'],
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os.path.join(cs.cheat_dir, cheat)])
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def list_cheatsheets(cheatsheets):
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"Lists the cheatsheets that are currently available"
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max_command = max([len(x) for x in cheatsheets.keys()]) + 3
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return ('\n'.join(sorted(['%s [%s]' % (key.ljust(max_command), value)
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for key, value in cheatsheets.items()])))
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def pretty_print(filename):
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"Applies syntax highlighting to a cheatsheet and writes it to stdout"
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try:
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if os.path.splitext(filename)[1]:
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lexer = get_lexer_for_filename(filename)
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else:
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# shell is a sensible default when there is no extension
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lexer = get_lexer_for_filename(filename + '.sh')
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except ClassNotFound:
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lexer = TextLexer()
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with open(filename) as istream:
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code = istream.read()
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fmt = TerminalFormatter()
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highlight(code, lexer, fmt, sys.stdout)
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def main():
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cheat_dirs = cheat_directories()
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# verify that we have at least one cheat directory
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if not cheat_dirs:
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error_msg = 'The {default} dir does not exist or the CHEATPATH var is not set.'
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print >> sys.stderr, error_msg.format(default=DEFAULT_CHEAT_DIR)
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exit()
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# list the files in the ~/.cheat directory
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cheatsheets = cheat_files(cheat_dirs)
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# list cheat directories and exit
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class ListDirectories(argparse.Action):
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def __call__(self, parser, namespace, values, option_string=None):
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print cheat_directories()
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parser.exit()
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# list cheatsheets and exit
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class ListCheatsheets(argparse.Action):
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def __call__(self, parser, namespace, values, option_string=None):
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print list_cheatsheets(cheatsheets)
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parser.exit()
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# if the user wants to edit a cheatsheet
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class EditSheet(argparse.Action):
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def __call__(self, parser, namespace, values, option_string=None):
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edit_cheatsheet(values[0], cheatsheets)
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parser.exit()
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desc = dedent('''
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cheat allows you to create and view interactive cheatsheets on the
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command-line. It was designed to help remind *nix system
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administrators of options for commands that they use frequently,
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but not frequently enough to remember.''').strip()
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epi = dedent('''
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Examples:
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To look up 'tar':
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cheat tar
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To create or edit the cheatsheet for 'foo':
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cheat -e foo
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To list the directories on the CHEATPATH
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cheat -d
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To list the available cheatsheets:
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cheat -l
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''').strip()
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parser = argparse.ArgumentParser(prog='cheat',
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description=desc, epilog=epi,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser_group = parser.add_mutually_exclusive_group()
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parser_group.add_argument('sheet', metavar='cheatsheet',
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action='store', type=str, nargs='?',
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help='Look at <cheatseet>')
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parser_group.add_argument('-c', '--create', metavar='cheatsheet',
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action=EditSheet, type=str, nargs=1,
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help='Create <cheatsheet>')
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parser_group.add_argument('-e', '--edit', metavar='cheatsheet',
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action=EditSheet, type=str, nargs=1,
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help='Edit <cheatsheet>')
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parser_group.add_argument('-l', '--list',
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action=ListCheatsheets, nargs=0,
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help='List all available cheatsheets')
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parser_group.add_argument('-d', '--cheat-directories',
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action=ListDirectories, nargs=0,
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help='List all current cheat dirs')
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args = parser.parse_args()
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sheet = args.sheet
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# Print the cheatsheet if it exists
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if not sheet or sheet in ['help', 'cheat']:
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parser.print_help()
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elif sheet in cheatsheets:
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filename = os.path.join(cheatsheets[sheet], sheet)
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if USE_PYGMENTS:
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pretty_print(filename)
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else:
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with open(filename) as istream:
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for l in istream:
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sys.stdout.write(l)
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# if it does not, say so
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else:
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print >> sys.stderr, ('No cheatsheet found for %s.' % sheet)
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exit(1)
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exit()
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if __name__ == '__main__':
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main()
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