transfer.fish: fish function wrapper to transfer.sh

transfer.fish

function transfer
    if test (count $argv) -eq 0
        echo "No arguments specified. Usage:"
        echo "transfer /tmp/test.md"
        echo "cat /tmp/test.md | transfer test.md"
        return 0
    end

    set tmpfile (mktemp -t transferXXX)

    if tty -s
        set basefile (basename "$argv[1]" | sed -e 's/[^a-zA-Z0-9._-]/-/g')
        curl --progress-bar --upload-file "$argv[1]" "https://transfer.sh/$basefile" >> $tmpfile
    else
        curl --progress-bar --upload-file "-" "https://transfer.sh/$argv[1]" >> $tmpfile
    end

    cat $tmpfile
    rm -f $tmpfile
end