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TheFuck - Magnificent App Which Corrects Your Previous Console Command

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Tuesday, January 05, 2016
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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 [enter/↑/↓/ctrl+c]
[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 [enter/↑/↓/ctrl+c]
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 [enter/↑/↓/ctrl+c]
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 [enter/↑/↓/ctrl+c]
* master
➜ lein rpl
'rpl' is not a task. See 'lein help'.

Did you mean this?
         repl

➜ fuck
lein repl [enter/↑/↓/ctrl+c]
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 not scared to blindly run the changed command, there is a 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
[sudo] password for nvbn:
Reading package lists... Done
...

Requirements
  • python (2.7+ or 3.3+)
  • pip
  • python-dev

Installation [ experimental ]
On Ubuntu and OS X you can install The Fuck with installation script: 
wget -O - https://raw.githubusercontent.com/nvbn/thefuck/master/install.sh | sh - && $0

 Manual installation
Install The Fuck with pip : 
sudo pip install thefuck
Or using an OS package manager (OS X, Ubuntu, Arch).
You should place this command in your .bash_profile , .bashrc , .zshrc or other startup script: 
eval "$(thefuck --alias)"
# You can use whatever you want as an alias, like for Mondays:
eval "$(thefuck --alias FUCK)"
Or in your shell config (Bash, Zsh, Fish, Powershell, tcsh).
Changes will be available only in a new shell session. To make them available immediately, run source ~/.bashrc (or your shell config file like .zshrc ).

Update 
sudo pip install thefuck --upgrade
Aliases changed in 1.34.

How it works
The Fuck tries to match a rule for the previous command, creates a new command using the matched rule and runs it. Rules enabled by default are as follows:
  • cargo – runs cargo build instead of cargo ;
  • cargo_no_command – fixes wrongs commands like cargo buid ;
  • cd_correction – spellchecks and correct failed cd commands;
  • cd_mkdir – creates directories before cd'ing into them;
  • cd_parent – changes cd.. to cd .. ;
  • composer_not_command – fixes composer command name;
  • cp_omitting_directory – adds -a when you cp directory;
  • cpp11 – adds missing -std=c++11 to g++ or clang++ ;
  • dirty_untar – fixes tar x command that untarred in the current directory;
  • dirty_unzip – fixes unzip command that unzipped in the current directory;
  • django_south_ghost – adds --delete-ghost-migrations to failed because ghosts django south migration;
  • django_south_merge – adds --merge to inconsistent django south migration;
  • docker_not_command – fixes wrong docker commands like docker tags ;
  • dry – fixes repetitions like git git push ;
  • fix_alt_space – replaces Alt+Space with Space character;
  • fix_file – opens a file with an error in your $EDITOR ;
  • git_add – fixes "Did you forget to 'git add'?" ;
  • git_branch_delete – changes git branch -d to git branch -D ;
  • git_branch_list – catches git branch list in place of git branch and removes created branch;
  • git_checkout – fixes branch name or creates new branch;
  • git_diff_staged – adds --staged to previous git diff with unexpected output;
  • git_fix_stash – fixes git stash commands (misspelled subcommand and missing save );
  • git_not_command – fixes wrong git commands like git brnch ;
  • git_pull – sets upstream before executing previous git pull ;
  • git_pull_clone – clones instead of pulling when the repo does not exist;
  • git_push – adds --set-upstream origin $branch to previous failed git push ;
  • git_push_pull – runs git pull when push was rejected;
  • git_stash – stashes you local modifications before rebasing or switching branch;
  • git_two_dashes – adds a missing dash to commands like git commit -amend or git rebase -continue ;
  • go_run – appends .go extension when compiling/running Go programs
  • grep_recursive – adds -r when you trying to grep directory;
  • gulp_not_task – fixes misspelled gulp tasks;
  • has_exists_script – prepends ./ when script/binary exists;
  • heroku_not_command – fixes wrong heroku commands like heroku log ;
  • history – tries to replace command with most similar command from history;
  • java – removes .java extension when running Java programs;
  • javac – appends missing .java when compiling Java files;
  • lein_not_task – fixes wrong lein tasks like lein rpl ;
  • ls_lah – adds -lah to ls ;
  • man – changes manual section;
  • man_no_space – fixes man commands without spaces, for example mandiff ;
  • mercurial – fixes wrong hg commands;
  • mkdir_p – adds -p when you trying to create directory without parent;
  • mvn_no_command – adds clean package to mvn ;
  • mvn_unknown_lifecycle_phase – fixes misspelled lifecycle phases with mvn ;
  • no_command – fixes wrong console commands, for example vom/vim ;
  • no_such_file – creates missing directories with mv and cp commands;
  • open – prepends http to address passed to open ;
  • pip_unknown_command – fixes wrong pip commands, for example pip instatl/pip install ;
  • python_command – prepends python when you trying to run not executable/without ./ python script;
  • python_execute – appends missing .py when executing Python files;
  • quotation_marks – fixes uneven usage of ' and " when containing args';
  • rm_dir – adds -rf when you trying to remove directory;
  • sed_unterminated_s – adds missing '/' to sed 's s commands;
  • sl_ls – changes sl to ls ;
  • ssh_known_hosts – removes host from known_hosts on warning;
  • sudo – prepends sudo to previous command if it failed because of permissions;
  • switch_lang – switches command from your local layout to en;
  • systemctl – correctly orders parameters of confusing systemctl ;
  • test.py – runs py.test instead of test.py ;
  • touch – creates missing directories before "touching";
  • tsuru_login – runs tsuru login if not authenticated or session expired;
  • tsuru_not_command – fixes wrong tsuru commands like tsuru shell ;
  • tmux – fixes tmux commands;
  • unknown_command – fixes hadoop hdfs-style "unknown command", for example adds missing '-' to the command on hdfs dfs ls ;
  • vagrant_up – starts up the vagrant instance;
  • whois – fixes whois command.
Enabled by default only on specific platforms:
  • apt_get – installs app from apt if it not installed (requires python-commandnotfound / python3-commandnotfound );
  • apt_get_search – changes trying to search using apt-get with searching using apt-cache ;
  • brew_install – fixes formula name for brew install ;
  • brew_unknown_command – fixes wrong brew commands, for example brew docto/brew doctor ;
  • brew_upgrade – appends --all to brew upgrade as per Homebrew's new behaviour;
  • pacman – installs app with pacman if it is not installed (uses yaourt if available);
  • pacman_not_found – fixes package name with pacman or yaourt .
Bundled, but not enabled by default:
  • git_push_force – adds --force to a git push (may conflict with git_push_pull );
  • 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 . The rule should contain two functions: 
match(command: Command) -> bool
get_new_command(command: Command) -> str | list[str]
Also the rule can contain an optional function 
side_effect(old_command: Command, fixed_command: str) -> None
and optional enabled_by_default , requires_output and priority variables.
Command has three attributes: script , stdout and stderr .
Rules api changed in 3.0: For accessing settings in rule you need to import it with from thefuck.conf import settings . settings is a special object filled with ~/.thefuck/settings.py and values from env ( see more below ).
Simple example of the rule for running script with sudo : 
def match(command):
    return ('permission denied' in command.stderr.lower()
            or 'EACCES' in command.stderr)


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

# Optional:
enabled_by_default = True

def side_effect(command, fixed_command):
    subprocess.call('chmod 777 .', shell=True)

priority = 1000  # Lower first, default is 1000

requires_output = True
More examples of rules , utility functions for rules , app/os-specific helpers .

Settings
The Fuck has a few settings parameters which can be changed in ~/.thefuck/settings.py :
  • rules – list of enabled rules, by default thefuck.conf.DEFAULT_RULES ;
  • exclude_rules – list of disabled rules, by default [] ;
  • require_confirmation – requires confirmation before running new command, by default True ;
  • wait_command – max amount of time in seconds for getting previous command output;
  • no_colors – disable colored output;
  • priority – dict with rules priorities, rule with lower priority will be matched first;
  • debug – enables debug output, by default False .
Example of settings.py : 
rules = ['sudo', 'no_command']
exclude_rules = ['git_push']
require_confirmation = True
wait_command = 10
no_colors = False
priority = {'sudo': 100, 'no_command': 9999}
debug = False
Or via environment variables:
  • THEFUCK_RULES – list of enabled rules, like DEFAULT_RULES:rm_root or sudo:no_command ;
  • THEFUCK_EXCLUDE_RULES – list of disabled rules, like git_pull:git_push ;
  • 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 ;
  • THEFUCK_PRIORITY – priority of the rules, like no_command=9999:apt_get=100 , rule with lower priority will be matched first;
  • THEFUCK_DEBUG – enables debug output, true/false .
For example: 
export THEFUCK_RULES='sudo:no_command'
export THEFUCK_EXCLUDE_RULES='git_pull:git_push'
export THEFUCK_REQUIRE_CONFIRMATION='true'
export THEFUCK_WAIT_COMMAND=10
export THEFUCK_NO_COLORS='false'
export THEFUCK_PRIORITY='no_command=9999:apt_get=100'

 Developing
Install The Fuck for development: 
pip install -r requirements.txt
python setup.py develop
Run unit tests: 
py.test
Run unit and functional tests (requires docker): 
py.test --enable-functional
For sending package to pypi: 
sudo apt-get install pandoc
./release.py


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