gtk:label-line-wrap-mode (label)

label -- a gtk:label widget
mode -- a pango:wrap-mode value for the line wrapping mode

The gtk:label-line-wrap-mode function returns the line wrap mode used by the label. The (setf gtk:label-line-wrap-mode) function sets the line wrap mode of the label.

If line wrapping is on this controls how the line wrapping is done. The default is :word which means wrap on word boundaries.