Fish autocompletion for mill 1.0

mill.fish

# Mill completion for fish shell
# Ported from Mill's bash/zsh completion script

function __mill_completions
    # Get current command line tokens
    set -l tokens (commandline -opc)
    set -l position (count $tokens)
    
    # Get completions from mill and strip descriptions
    if test -x ./mill
        ./mill --tab-complete $position $tokens 2>/dev/null | sed 's/ .*//'
    else
        mill --tab-complete $position $tokens 2>/dev/null | sed 's/ .*//'
    end
end

# Register the completion
complete -c mill -f -a "(__mill_completions)"