Author: | Catherine Devlin |
---|---|
Date: | 2010-02-20 |
slides: | http://pypi.python.org/pypi/cmd2 |
- Sargon the Great
- Founder of Akkadian Empire
- Command-Line Interface
- Unlike the Akkadian Empire, the CLI will never die.
Also known as
- "Line-oriented command interpreter"
- "Command-line interface"
- "Shell"
- Accepts free text input at prompt
- Outputs lines of text
- (repeat)
- Bash, Korn, zsh
- Python shell
- screen
- Zork
- SQL clients: psql, SQL*Plus, mysql...
- ed
(ls
, grep
, ping
, etc.)
- Accept arguments at invocation
- execute
- terminate
Use sys.argv
, optparse
- Use entire (session) screen
- I/O is not line-by-line
- See
curses
,urwid
from cmd import Cmd class Pirate(Cmd): pass pirate = Pirate() pirate.cmdloop()
(Cmd) foo a b c
becomes
self.do_foo('a b c')
class Pirate(Cmd): gold = 3 def do_loot(self, arg): 'Seize booty frrrom a passing ship.' self.gold += 1 print('Now we gots {0} doubloons' .format(self.gold)) def do_drink(self, arg): 'Drown your sorrrows in rrrum.' self.gold -= 1 print('Now we gots {0} doubloons' .format(self.gold))
self.preloop() self.postloop() self.precmd(line) self.postcmd(stop, line)
def do_loot(self, arg): 'Seize booty from a passing ship.' self.gold += 1 def do_drink(self, arg): 'Drown your sorrrows in rrrum.' self.gold -= 1 def precmd(self, line): self.initial_gold = self.gold return line def postcmd(self, stop, line): if self.gold != self.initial_gold: print('Now we gots {0} doubloons' .format(self.gold))
def do_drink(self, arg): '''Drown your sorrrows in rrrum. drink [n] - drink [n] barrel[s] o' rum.''' try: self.gold -= int(arg) except: if arg: print('''What's "{0}"? I'll take rrrum.''' .format(arg)) self.gold -= 1
def postcmd(self, stop, line): if self.gold != self.initial_gold: print('Now we gots {0} doubloons' .format(self.gold)) if self.gold < 0: print("Off to debtorrr's prison.") stop = True return stop def do_quit(self, arg): print("Quiterrr!") return True
prompt = 'arrr> ' def default(self, line): print('What mean ye by "{0}"?' .format(line))
- CmdLoop
- cly
- CMdO
- pycopia
- cmdlin
- cmd2
Convert cmd
app to cmd2
Python 3 compatible
(um, mostly)
Script files
Commands at invocation
Output redirection
Python
Transcript testing
- Abbreviated commands
- Shell commands
- Quitting
- Timing
- Echo
- Debug
default_to_shell = True multilineCommands = ['sing'] terminators = Cmd.terminators + ['...'] songcolor = 'blue' settable = Cmd.settable + 'songcolor Color to ``sing`` in (red/blue/green/cyan/magenta, bold, underline)' Cmd.shortcuts.update({'~': 'sing'}) def do_sing(self, arg): print(self.colorize(arg, self.songcolor))
options / flags
Quiet (suppress feedback)
BASH-style select
Parsing: terminators, suffixes
@options([make_option('--ho', type='int', default=2, help="How often to chant 'ho'"), make_option('-c', '--commas', action="store_true", help="Intersperse commas")]) def do_yo(self, arg, opts): chant = ['yo'] + ['ho'] * opts.ho separator = ', ' if opts.commas else ' ' chant = separator.join(chant) print('{0} and a bottle of {1}' .format(chant, arg))
cmd
-based app by Luca Canali @ CERN
Replacement for Oracle SQL*Plus
Now cmd2
-based; postgreSQL; MySQL
Gather info: Python
Store: postgresql
Report: html
import glob import os.path for fullfilename in glob.glob('/home/cat/proj/cmd2/*.py'): (dirpath, fname) = os.path.split(fullfilename) stats = os.stat(fullfilename) binds['path'] = dirpath binds['name'] = fname binds['bytes'] = stats.st_size cmd("""INSERT INTO cat.files (path, name, bytes) VALUES (%(path)s, %(name)s, %(bytes)s)""") quit()
- from
cmd2
: scripts, redirection, py, etc. - multiple connections
- UNIX: ls, cat, grep
- Special output
http://pypi.python.org/pypi/cmd2