takedawilliam
I open a new shell with zscroll by executing the following command ``` nix-shell -p zscroll ``` Then, I try running the following command ``` zscroll "$(mpc current)" ``` Instead of returning some results, it shows the help page ``` [nix-shell:~/.config/nixpkgs]$ zscroll "$(mpc current)" usage: zscroll [-h] [-l LENGTH] [-b BEFORETEXT] [-a AFTERTEXT] [-p SCROLLPADDING] [-d DELAY] [-s SCROLL] [-m MATCHTEXT] [-M MATCHCOMMAND] [-u] [-n] [-c] [-f] [scrolltext] positional arguments: scrolltext text to scroll; will print in place if not longer than scroll length; can be read from stdin, e.g. 'echo text | zscroll' optional arguments: -h, --help show this help message and exit -l LENGTH, --length LENGTH length of scrolling text not including left and right padding text (default: 40) -b BEFORETEXT, --beforetext BEFORETEXT stationary padding text to be displayed to the left of the scrolling text (default: "") -a AFTERTEXT, --aftertext AFTERTEXT stationary padding text to be displayed to the right of the scrolling text (default: "") -p SCROLLPADDING, --scrollpadding SCROLLPADDING paddingtext to be displayed between the start and end of thetext only when it is scrolling (default: " - ") -d DELAY, --delay DELAY second delay for scrolling update; lower for faster scrolling (default: 0.4) -s SCROLL, --scroll SCROLL set to 0 to always prevent scrolling; meant to be used with -g (default: 1) -m MATCHTEXT, --matchtext MATCHTEXT regexp to search for in matchcommand output to determine whether to change settings (default: none) -M MATCHCOMMAND, --matchcommand MATCHCOMMAND command(s) to search output of (default: none) -u, --updatecheck specifies that the positional argument is a command that should be checked to determine if the scroll text should be updated (default: no) -n, --newline print a newline after each update (default: no) -c, --characterlength count length by characters instead of considering fullwidth characters to be length 2 (default: no) -f, --fullwidth if fullwidth characters are found in the text, convert all characters to be fullwidth (default: no) [nix-shell:~/.config/nixpkgs]$ ``` I don't know what happened here. Could you please help?