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Mohsen
Mohsen

Reputation: 65795

Make bash commands to fall back to git commands if git command exists

Basically I want to type show and it checks if there is a show command or alias is defined and fire it and it is not defined fires git show.

For example rm should do rm but checkout should do git checkout.

Is it possible to program this in bashrc?

Upvotes: 2

Views: 1081

Answers (5)

chepner
chepner

Reputation: 531355

When bash cannot find a command, it calls command_not_found_handle (if defined). You can define it to look something like this:

command_not_found_handle () {
    git "$@" || { echo "$1 not a 'git' command either"; exit 127; }
}

Upvotes: 2

antak
antak

Reputation: 20799

Here's one way of getting a list of all your git commands:

git help -a | egrep '^  [a-zA-Z0-9]' | xargs -n1 | sed 's/--.*//' | sort -u

Or you could use what's in contrib/completion/git-completion.sh: (This is probably better since you'll probably be looping anyway. Note: You'll need to consider for duplicates, but they don't really matter for alias)

__git_list_all_commands ()
{
    local i IFS=" "$'\n'
    for i in $(git help -a|egrep '^  [a-zA-Z0-9]')
    do
        case $i in
        *--*)             : helper pattern;;
        *) echo $i;;
        esac
    done
}

Upvotes: 0

Gilles Quénot
Gilles Quénot

Reputation: 185254

There's no simple and proper way to achieve what you need. I think the best to do is to make an alias in ~/.bashrc for every git commands.

But on many distros, if you check man git, there's some Main porcelain commands that looks like aliases.

You can list all of them using

PAGER= man git | grep -oP 'git-\w+(?=\()'

Upvotes: 2

Jonathan Wakely
Jonathan Wakely

Reputation: 171323

This is surprisingly easy:

master tmp$ trap 'git $BASH_COMMAND' ERR
master tmp$ touch foo
master tmp$ rm foo
master tmp$ add foo
bash: add: command not found
fatal: pathspec 'tmp/foo' did not match any files
master tmp$ branch
bash: branch: command not found
  aix
  allocators
  ...

This runs the usual touch and rm commands, but because there is no add command it runs git add foo and because there is no branch command it runs git branch

The trap command is run on any error, so not only when a command isn't found. You would probably want to do something smarter e.g. run a script which checks whether $? is 127 (the code bash sets when a command is not found) and then checks if running it with git instead would work (e.g. by checking for a command called git-xxx where xxx is the first word of $BASH_COMMAND). I leave that as an exercise for the reader.

Upvotes: 4

Guilherme Bernal
Guilherme Bernal

Reputation: 8303

Add to your ~/.bashrc:

alias show='git show'
alias checkout='git checkout'
...

Be careful not to make an alias for a command that already does something else. This may break others programs.

Upvotes: 0

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