fish-shell/share/functions/open.fish

#
# This allows us to use 'open FILENAME' to open a given file in the default
# application for the file.
#
if not command -sq open
    function open --description "Open file in default application"
        set -l options 'h/help'
        argparse -n open --min-args=1 $options -- $argv
        or return

        if set -q _flag_help
            __fish_print_help open
            return 0
        end

        if type -q -f cygstart
            for i in $argv
                cygstart $i
            end
        else if type -q -f xdg-open
            for i in $argv
                xdg-open $i
            end
        else
            echo (_ 'No open utility found. Try installing "xdg-open" or "xdg-utils".')
        end
    end
end