Use expand("%:r") to get current file path relative to the root.
+Use filename completion (:help compl-filename) to complete
+directories and filenames in them.
+
Square bracketed links can be highlighted with:
syntax region zkLink start="\[\S" end="\S]"
highlight link zkLink String
-Use filename completion (:help compl-filename) to complete
-directories and filenames in them.
+Command ([FORMAT]) lines can be highlighted with:
+
+ syntax match command /^.*\r$/
+ highlight command ctermbg=blue