GtkSourceView is a text widget that extends the standard GTK+ 3.x text widget GtkTextView. It improves GtkTextView by implementing syntax highlighting and other features typical of a source editor. This port contains version 4 of the GtkSourceView widget. Port gtksourceview3 contains version 3 of widget, gtksourceview2 contains version 2 and port gtksourceview contains version 1.

WWW: https://wiki.gnome.org/Projects/GtkSourceView
