neovim/runtime/ftplugin/scheme.vim

" Vim filetype plugin file
" Language:            Scheme (R7RS)
" Last Change:         2024 Jun 21
"                      2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
" Author:              Evan Hanson <evhan@foldling.org>
" Maintainer:          Evan Hanson <evhan@foldling.org>
" Previous Maintainer: Sergey Khorev <sergey.khorev@gmail.com>
" Repository:          https://git.foldling.org/vim-scheme.git
" URL:                 https://foldling.org/vim/ftplugin/scheme.vim

if exists('b:did_ftplugin')
  finish
endif

let s:cpo = &cpo
set cpo&vim

setl lisp
setl comments=:;;;;,:;;;,:;;,:;,sr:#\|,mb:\|,ex:\|#
setl commentstring=;\ %s
setl define=^\\s*(def\\k*
setl iskeyword=33,35-39,42-43,45-58,60-90,94,95,97-122,126
setl formatoptions-=t

let b:undo_ftplugin = 'setl lisp< comments< commentstring< define< iskeyword< formatoptions<'

setl lispwords+=case
setl lispwords+=define
setl lispwords+=define-library
setl lispwords+=define-record-type
setl lispwords+=define-syntax
setl lispwords+=define-values
setl lispwords+=do
setl lispwords+=guard
setl lispwords+=lambda
setl lispwords+=let
setl lispwords+=let*
setl lispwords+=let*-values
setl lispwords+=let-syntax
setl lispwords+=let-values
setl lispwords+=letrec
setl lispwords+=letrec*
setl lispwords+=letrec-syntax
setl lispwords+=parameterize
setl lispwords+=set!
setl lispwords+=syntax-rules
setl lispwords+=unless
setl lispwords+=when

let b:undo_ftplugin = b:undo_ftplugin . ' lispwords<'

let b:did_scheme_ftplugin = 1

if exists('b:is_chicken') || exists('g:is_chicken')
  runtime! ftplugin/chicken.vim
endif

unlet b:did_scheme_ftplugin
let b:did_ftplugin = 1
let &cpo = s:cpo
unlet s:cpo