hoon syntax highlighting for kakoune

hoon.kak

# Detection
#

hook global BufCreate .*[.](hoon) %{
    set buffer filetype hoon
}

# Highlighters & Completion
#

add-highlighter -group / regions -default code hoon \
  doq      '"'    (?<!\\)(\\\\)*"    '' \
  soq      "'"    (?<!\\)(\\\\)*'    '' \
  scol    '::'    '$'                '' \
  slus    "\+\+\s(\s+)(\w|\-|\d)+"  \s  ''

add-highlighter -group /hoon/soq     fill string
add-highlighter -group /hoon/doq     fill string
add-highlighter -group /hoon/scol    fill comment
add-highlighter -group /hoon/slus    fill function

# Terms, constants, etc.
add-highlighter -group /hoon/code regex \%(\w|\-|\d)+ 0:value 1:value
add-highlighter -group /hoon/code regex \$(\w|\-|\d)+ 0:keyword 1:keyword

# Initialization
#

hook -group hoon-highlight global \
    WinSetOption filetype=hoon %{ add-highlighter ref hoon }

hook -group hoon-highlight global WinSetOption \
    filetype=(?!hoon).* %{ remove-highlighter hoon }