The Fuck

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

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 apt-get install vim
[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
git push --set-upstream origin master
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
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
git branch
* master

➜ lein rpl
'rpl' is not a task. See 'lein help'.

Did you mean this?
         repl

➜ fuck
lein repl
nREPL server started on port 54848 on host 127.0.0.1 - nrepl://127.0.0.1:54848
REPL-y 0.3.1
...

If you are scared to blindly run changed command, there's require_confirmation settings option:

➜ 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 apt-get install vim [Enter/Ctrl+C]
[sudo] password for nvbn:
Reading package lists... Done
...

Requirements

• pip
• python
• python-dev

Installation

Install The Fuck with pip:

sudo pip install thefuck

If it fails try to use easy_install:

sudo easy_install thefuck

Or using an OS package manager (currently supported in OSX via brew):

brew install thefuck

And add to .bashrc or .zshrc or .bash_profile(for OSX):

alias fuck='$(thefuck $(fc -ln -1))'
# You can use whatever you want as an alias, like for mondays:
alias FUCK='fuck'

Or in config.fish:

function fuck
    eval (thefuck $history[1])
end

Or in your Powershell $PROFILE on Windows:

function fuck { 
    $fuck = $(thefuck (get-history -count 1).commandline)
    if($fuck.startswith("echo")) { 
        $fuck.substring(5) 
    } 
    else { iex "$fuck" } 
}

Changes will be available only in a new shell session.

Update

sudo pip install thefuck --upgrade

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:

• cd_parent – changes cd.. to cd ..;
• cp_omitting_directory – adds -a when you cp directory;
• git_no_command – fixes wrong git commands like git brnch;
• git_push – adds --set-upstream origin $branch to previous failed git push;
• has_exists_script – prepends ./ when script/binary exists;
• lein_not_task – fixes wrong lein tasks like lein rpl;
• mkdir_p – adds -p when you trying to create directory without parent;
• no_command – fixes wrong console commands, for example vom/vim;
• python_command – prepends python when you trying to run not executable/without ./ python script;
• rm_dir – adds -rf when you trying to remove directory;
• ssh_known_hosts – removes host from known_hosts on warning;
• sudo – prepends sudo to previous command if it failed because of permissions;
• switch_layout – switches command from your local layout to en.

Bundled, but not enabled by default:

• rm_root – adds --no-preserve-root to rm -rf / command.

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 has three attributes: script, stdout and stderr.

Settings is a special object filled with ~/.thefuck/settings.py and values from env, more.

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 has a few settings parameters, they can be changed in ~/.thefuck/settings.py:

• rules – list of enabled rules, by default thefuck.conf.DEFAULT_RULES;
• require_confirmation – require confirmation before running new command, by default False;
• wait_command – max amount of time in seconds for getting previous command output;
• no_colors – disable colored output.

Or via environment variables:

• THEFUCK_RULES – list of enabled rules, like DEFAULT_RULES:rm_root or sudo:no_command;
• THEFUCK_REQUIRE_CONFIRMATION – require confirmation before running new command, true/false;
• THEFUCK_WAIT_COMMAND – max amount of time in seconds for getting previous command output;
• THEFUCK_NO_COLORS – disable colored output, true/false.

Developing

Install The Fuck for development:

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

Run tests:

py.test

License MIT

Project License can be found here.