fish-shell/share/functions/fish_config.fish

function fish_config --description "Launch fish's web based configuration"
    # Support passing an initial tab like "colors" or "functions"
    set -l initial_tab
    if count $argv >/dev/null
        set initial_tab $argv[1]
    end
    set -x __fish_bin_dir $__fish_bin_dir
    eval (string escape $__fish_datadir/tools/web_config/webconfig.py) $initial_tab
end