Vim support for SLI files

A simple syntax file for Vim users is provided below. Copy it to your Vim configuration folder to make it available to Vim:

$ cp ${prefix}/share/doc/nest/EditorSupport/vim/syntax/sli.vim ~/.vim/syntax/sli.vim

Then add the following lines to your ~/.vimrc file to use it:

" sli
au BufRead,BufNewFile *.sli set filetype=sli
au FileType sli setl foldenable foldmethod=syntax