EmacsWiki: Fill Column IndicatorEmacs 27 will provide a similar feature, ‘display-fill-column-indicator-mode’. The possible customizations and features are somewhat different. Many modern editors and IDEs can graphically indicate the location of the fill column by drawing a thin line (in design parlance, a “rule”) down the length of the editing window. The package fill-column-indicator.el implements this facility in Emacs: Pleas
