Vim syntax file to Hugo markdown files

markdown.vim

" Vim syntax file                                                                                                                                                                                                                             
" Language: markdown with embedded yaml, toml for Hugo
" Author:   James Wright ([email protected])
" License:  MIT
" Inspired by https://github.com/pbrisbin/vim-syntax-shakespeare/blob/master/after/syntax/haskell.vim

" store and remove current syntax value
if exists('b:current_syntax')
  let old_syntax = b:current_syntax
  unlet b:current_syntax
endif

syn include @yaml syntax/yaml.vim
unlet b:current_syntax

syn include @toml syntax/toml.vim
unlet b:current_syntax

if getline(1) =~ '---'
    syn region yamlBlock matchgroup=quasiQuote start=/\%^---/ end=/^---/ contains=@yaml
elseif getline(1) =~ '+++'
    syn region tomlBlock matchgroup=quasiQuote start=/\%^+++/ end=/^+++/ contains=@toml
endif

if version < 508
  command! -nargs=+ HiLink hi link <args>
else
  command! -nargs=+ HiLink hi def link <args>
endif


HiLink quasiQuote     Boolean

delcommand HiLink

" restore current syntax value
if exists('old_syntax')
  let b:current_syntax = old_syntax
endif

What's this?

This will allow for the front matter of a Hugo markdown document to be syntax highlighted differently than the markdown itself.

Here you can see that both the yaml front matter and the markdown body is syntax highlighted correctly

How do I use it?

Put this file in [vim/nvim config path]/after/syntax/.