Windows Git Bash ~/.bashrc file

.bashrc

function _gmto()
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"

    COMPREPLY=( $(compgen -W "$(git branch | sed '/\*/d' | xargs echo)" -- ${cur}) )
    return 0
}
case $SHELL in
    '/bin/bash' )
        complete -F _gmto gmto
        ;;
    '/bin/zsh' )
        compdef gmto=git-branch
        ;;
esac

# git merge to branch
gmto(){
    local oldbranch=$(current_branch)
    local mergeto=$1
    git checkout $mergeto
    git merge $oldbranch
    git checkout $oldbranch
}

test -e ~/.bash_aliases.git && . ~/.bash_aliases.git