Description

Would it be possible to have a way to refer to the last n column / row in a table when checking for its x or y value in formatting functions (in set or show rules)?

May be negative numbers (x=-1 or y=-1) or an special function like nlast_x(0) or nlast_y(0) would mean the last column / row?

Use Case

When defining tables it is very convenient being able to use functions that take x and y indices to format some rows of columns.

Thus, it's easy to define generic show rules for headers or leading columns, like this:

#show table.cell.where(x: 0): set text(style: "italic")
#set table(
  stroke: (_, y) => if y == 0 {
    (top: 1pt) 
  } else if y == -1 {
    (bottom: 1pt)
  } else if y == 1 {
    (top: 0.5pt )
  }
)

But the last example doesn't work as y=-1 is not a valid test but it would be very handy as it would allow setting an special format for the last row (or x=-1 for the last column). This avoids having to define custom elements or having to hardcode formats in each table.