The Fuck

Magnificent app which corrects your previous console command, inspired by @liamosaur twit.

Few examples:

➜ apt-get install vim
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

➜ fuck
[sudo] password for nvbn: 
Reading package lists... Done
...

➜ git push
fatal: The current branch master has no upstream branch.
To push the current branch and set the remote as upstream, use

    git push --set-upstream origin master


➜ fuck
Counting objects: 9, done.
...

➜ puthon
No command 'puthon' found, did you mean:
 Command 'python' from package 'python-minimal' (main)
 Command 'python' from package 'python3' (main)
zsh: command not found: puthon

➜ fuck
Python 3.4.2 (default, Oct  8 2014, 13:08:17)
...

➜ git brnch
git: 'brnch' is not a git command. See 'git --help'.

Did you mean this?
	branch

➜ fuck
* master

Installation

Install The Fuck:

sudo pip install thefuck

And add to .bashrc or .zshrc:

alias fuck='$(thefuck $(fc -ln -1))'

Or in config.fish:

function fuck
    eval (thefuck (history | head -n1))
end

How it works

The Fuck tries to match rule for the previous command, create new command using matched rule and run it. Rules enabled by default:

git_no_command – fixes wrong git commands like git brnch;
git_push – adds --set-upstream origin $branch to previous failed git push;
no_command – fixes wrong console commands, for example vom/vim;
sudo – prepends sudo to previous command if it failed because of permissions.

Creating your own rules

For adding your own rule you should create your-rule-name.py in ~/.thefuck/rules. Rule should contain two functions: match(command: Command, settings: Settings) -> bool and get_new_command(command: Command, settings: Settings) -> str.

Command have three attributes: script, stdout and stderr.

Settings is ~/.thefuck/settings.py.

Simple example of the rule for running script with sudo:

def match(command, settings):
    return ('permission denied' in command.stderr.lower()
            or 'EACCES' in command.stderr)


def get_new_command(command, settings):
    return 'sudo {}'.format(command.script)

More examples of rules, utility functions for rules.

Settings

The Fuck have a few settings parameters:

rules – list of enabled rules, by default all;
command_not_found – path to command_not_found binary, by default /usr/lib/command-not-found.

Developing

Install The Fuck for development:

pip install -r requirements.txt
python setup.py develop

Run tests:

py.test