#import std

text =

-[Given$a$text$file$of$many$lines,$where$fields$within$a$line$
are$delineated$by$a$single$'dollar'$character,$write$a$program
that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$
column$are$separated$by$at$least$one$space.
Further,$allow$for$each$word$in$a$column$to$be$either$left$
justified,$right$justified,$or$center$justified$within$its$column.]-

pad = sep`$*; @FS ~&rSSSK7+ (zipp` ^*D\~& leql$^)*rSSK7+ zipp0^*D/leql$^ ~&

just_left   = mat` *+ pad
just_right  = mat` *+ pad; ==` ~-rlT**
just_center = mat` *+ pad; ==` ~-rK30PlrK31PTT**

#show+

main = mat0 <.just_left,just_center,just_right> text