Working with older .csproj Projects

OmniSharp-vim does not have any notion of .csproj files, and OmniSharp-roslyn has no options for editing them. This means that adding a new file or renaming an existing one can break your project if you are using an older-style .csproj project, which lists all .cs files.

There is an open issue with OmniSharp-roslyn to alter the .csproj file, but it seems unlikely that this will be addressed, as the newer .csproj files don't need this functionality.

However, for OmniSharp-vim users stuck for the time being on older .csproj files, here are some functions which can be used to add the current file to a .csproj. Please note that these are naiive and hacky functions, use at your own risk!

These functions can be added directly to a .vimrc and used from the commandline or with a mapping. Alternatively, create a ~/.vim/autoload folder, put these functions in a ~/.vim/autoload/myomnisharp.vim script, rename AddToProject to myomnisharp#AddToProject and map it like this: nnoremap <space>osa :call myomnisharp#AddToProject()<CR>.

" Search from the current directory up to the solution directory for a .csproj
" file, and return the first one found. Note that this may return the wrong
" .csproj file if two .csproj files are found in the same directory.
function! s:FindProject() abort
  let l:base = fnamemodify(OmniSharp#FindSolutionOrDir(), ':h')
  let l:dir = expand('%:p:h')
  while 1
    let l:projects = split(globpath(l:dir, '*.csproj'), '\n')
    if len(l:projects)
      return l:projects[0]
    endif
    let l:parent = fnamemodify(l:dir, ':h')
    if l:dir ==# l:parent || l:dir ==# l:base
      return ''
    endif
    let l:dir = l:parent
  endwhile
endfunction

" Add the current file to the .csproj. The .csproj must be found in an ancestor
" directory and must already contain at least one .cs file.
function! AddToProject() abort
  let l:filename = expand('%:p')
  let l:project = s:FindProject()
  if !len(l:project)
    echohl WarningMsg | echomsg 'Project not found' | echohl None
  endif
  execute 'silent tabedit' l:project
  call cursor(1, 1)
  if !search('^\s*<compile include=".*\.cs"', '')
    tabclose
    echohl WarningMsg | echomsg 'Could not find a .cs entry' | echohl None
  endif
  normal! yypk
  if fnamemodify(l:project, ':h') !=# getcwd()
    execute 'lcd' fnamemodify(l:project, ':h')
  endif
  execute 's/".*\.cs"/"' . fnamemodify(l:filename, ':.:gs?/?\\/?') . '"/'
  if g:OmniSharp_translate_cygwin_wsl || has('win32')
    s?/?\\?g
    s?\\>?/>?g
  endif
  write
  tabclose
endfunction