Git shell function (for aliasing) worked in bash with tab complete but not working in Zsh

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The alias I've used with success in bash but no longer works in Zsh looks like this

In .zshrc (previously .bashrc)

# custom git completions 
_git_a ()
{
    _git_add
}
_git_b ()
{
    _git_branch
}
_git_c ()
{
    _git_commit
}
_git_co () 
{
    _git_checkout 
}
.
.
.

# git alias function
g ()
{
    arg1=$1
    shift
    case "$arg1" in
        a)
            eval git add $@;;
        b)
            eval git branch $@;;
        c)
            eval git commit -m \"$1\";;
        co)
            eval git checkout $@;;
        .
        .
        .
        *)
            eval git $arg1 $@;;
    esac
}

zstyle ':completion:*:*:git:*' script ~/.git-completions-mingit.bash
autoload -Uz compinit && compinit -u
source ~/.mingit.sh
compdef g='git'

It used to be the case (in bash) that typing something within the alias such as

g co<TAB><TAB>

would result in the same behavior as

git checkout<TAB><TAB>

but now (in Zsh) the result is that g co<TAB><TAB> cycles through folders and files in the directory. Is there a way to get the tab completion on g co or other g commands to work the same as git ... when it comes to tab completion?

zsh alias git
1 Answers

This can be solved by following the instructions in git-completion.zsh (https://github.com/git/git/blob/master/contrib/completion/git-completion.zsh):

# For example, create a directory '~/.zsh/', copy this file to '~/.zsh/_git',
# and then add the following to your ~/.zshrc file:
#
#  fpath=(~/.zsh $fpath)
#
# You need git's bash completion script installed. By default bash-completion's
# location will be used (e.g. pkg-config --variable=completionsdir bash-completion).
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