vim ❤ dafny

vim-loves-dafny is a Vim plugin for Dafny, a C#-like language with support for formal verification.

Features

• .dfy file detection.

• Syntax highlighting.

• Syntastic integration

Installation

You can use your favorite pathogen-compatible plugin manager to install vim-loves-dafny.

If you're using vim-plug, for example, follow the following steps:

1. Edit your .vimrc and add a Plug declaration for vim-loves-dafny.

   call plug#begin()
   " ...
   Plug 'mlr-msft/vim-loves-dafny', {'for': 'dafny'}
   " ...
   call plug#end()

2. Restart Vim

3. :PlugInstall to install the plugin.

Configuration

Customizing the Dafny command arguments

You can ask Syntastic to pass custom arguments to Dafny. For example, you can add the following to your vimrc:

let g:syntastic_dafny_dafny_args = '-allowGlobals'

Passive Syntastic Checks

Non-trivial Dafny programs may take significantly more time to verify than a compiler would take to compile a single source file-- particularly if you are using include directives in your Dafny source. Unfortunately, Vim, being single-threaded, will freeze while Dafny is verifying your sources. We strongly recommend that you set Syntastic up to check your Dafny sources passively (on-demand) for this reason.

Add the following to your .vimrc to set this up:

" (optional) set your leader key (the default is <\>)
let mapleader=","
" Tell Syntastic to:
" - check files on save.
" - but only check Dafny files when requested.
let g:syntastic_mode_map = {
        \ "mode": "active",
        \ "passive_filetypes": ["dafny"] }
" (optional) map "save and check current file" to <leader>c
noremap <Leader>c :w<CR>:SyntasticCheck<CR>

Now, you can use :SyntasticCheck or, if you elected to do so, ,c to check your dafny file.

License

vim-loves-dafny is distributed under the Microsoft Public License, which same license that Dafny itself uses. See LICENSE for more details.

Planned Improvements

• more vibrant syntax highlighting.