autoload: resolving the solution file based on a function

Passed by the user.

Author: sim590

autoload/OmniSharp.vim

@@ -109,7 +109,11 @@ function! OmniSharp#FindSolutionOrDir(...) abort
   let bufnr = a:0 > 1 ? a:2 : bufnr('%')
   if empty(getbufvar(bufnr, 'OmniSharp_buf_server'))
     try
-      let sln = s:FindSolution(interactive, bufnr)
+      if g:OmniSharp_sln_resolve_function != v:null
+        let sln = call(g:OmniSharp_sln_resolve_function, [])
+      else
+        let sln = s:FindSolution(interactive, bufnr)
+      endif
       call setbufvar(bufnr, 'OmniSharp_buf_server', sln)
     catch
       return ''

doc/omnisharp-vim.txt

@@ -190,6 +190,24 @@ Default: {} >
     \ 'C:\path\to\other\project': 2004,
     \}
 <
+                                                       *g:OmniSharp_sln_resolve_function*
+Function used to resolve the solution file anytime it needs to be resolved
+based on the currently opened file.
+
+This can be used in various ways, but one particular use case might be when
+you need Omnisharp to stick to a given solution file that would contain all
+the projects that you need to work with even though you navigate to
+subprojects where other solution files could be found there. In that case, one
+could pass a value along the following lines:
+
+>
+    let g:OmniSharp_sln_resolve_function = { -> "/the/path/to/my/main_project.sln" }
+<
+
+This is a lambda expression that always evaluates to the string
+`/the/path/to/my/main_project.sln`. One could imagine more complexed cases.
+It's up to the user to use this as he sees fit.
+
 -------------------------------------------------------------------------------
 3.2 DIAGNOSTICS                                    *omnisharp-diagnostic-options*
 

plugin/OmniSharp.vim

@@ -52,6 +52,8 @@ let g:OmniSharp_coc_snippet = get(g:, 'OmniSharp_coc_snippet', 0)
 
 let g:omnicomplete_fetch_full_documentation = get(g:, 'omnicomplete_fetch_full_documentation', 1)
 
+let g:OmniSharp_sln_resolve_function = get(g:, 'OmniSharp_sln_resolve_function',  v:null)
+
 command! -bar -nargs=? OmniSharpInstall call OmniSharp#Install(<f-args>)
 command! -bar -nargs=? OmniSharpOpenLog call OmniSharp#log#Open(<q-args>)
 command! -bar -bang OmniSharpStatus call OmniSharp#Status(<bang>0)