A simple example for syntax coloring of ".txt" files. *Sample Sample Sample => PreProc ;Sample Sample Sample => Comment

filetype.vim

augroup filetypedetect
  au BufNewFile,BufRead *.txt setf txt
augroup END

txt.vim

" Vim syntax file

if exists("b:current_syntax")
  finish
endif

syn match txtSection "^\*.*$"
syn match txtComment "^;.*$"

hi link txtSection PreProc
hi link txtComment Comment

let b:current_syntax = "txt"

• filetype.vim は ~/.vim/filetype.vim に置く。
• txt.vim は ~/.vim/syntax/txt.vim に置く。