Fuzzy Git Checkout - For when you have too many branches

.bashrc

# requires fzf

# co -: check out last branch
# co -anything at all: just does a plain git checkout
# co foo: check out the branch with the closest name to "foo"
function co() {
    if [[ $1 == -* ]]; then
        git checkout "$@";
    else
        git checkout "$(git for-each-ref --format='%(refname:short)' refs/heads/** | fzf -f "$1" | head -1)";
    fi
}

# coi: show a an interactive branch selector with preview of last commit+diff
# coi foo: show the interactive selector with "foo" pre-typed
function coi() {
    sel="$(git for-each-ref --format='%(refname:short)' refs/heads/** | fzf --preview 'git show --color {}' -q "$1")" || return $?;
    git checkout "$sel"
}