feat: migrate omnisharp to roslyn

lua/plugins/lsp.lua

@@ -3,7 +3,12 @@ return {
     "williamboman/mason.nvim",
     lazy = false,
     config = function()
-			require("mason").setup()
+      require("mason").setup({
+        registries = {
+          "github:mason-org/mason-registry",
+          "github:Crashdummyy/mason-registry",
+        },
+      })
     end,
   },
   {
@@ -36,7 +41,6 @@ return {
   },
   {
     "neovim/nvim-lspconfig",
-		dependencies = { "hoffs/omnisharp-extended-lsp.nvim" },
     lazy = false,
     config = function()
       local capabilities = require("cmp_nvim_lsp").default_capabilities()
@@ -85,14 +89,54 @@ return {
 
       vim.lsp.enable("eslint")
 
-			vim.lsp.config("omnisharp", {
+      vim.lsp.config("roslyn_ls", {
-				handlers = {
+        settings = {
-					["textDocument/definition"] = require("omnisharp_extended").handler,
+          ["csharp|projects"] = {
+            dotnet_enable_file_based_programs = true,
           },
-				capabilities = capabilities,
+        },
+        root_dir = function(bufnr, cb)
+          local bufname = vim.api.nvim_buf_get_name(bufnr)
+
+          -- decompiled files: reuse previous buffer's client root
+          if bufname:find('[/\\]MetadataAsSource[/\\]') then
+            local _, endpos = bufname:find('[/\\]MetadataAsSource[/\\]')
+
+            if vim.fn.finddir(bufname:sub(1, endpos), vim.uv.os_tmpdir()) ~= '' then
+              local prev = vim.fn.bufnr('#')
+              local client = vim.lsp.get_clients({ name = 'roslyn_ls', bufnr = (prev ~= -1 and prev) or nil })[1]
+
+              if client then
+                cb(client.config.root_dir)
+                return
+              end
+            end
+          end
+
+          -- 1) Look for .sln / .slnx
+          local root = vim.fs.root(bufnr, function(fname)
+            return fname:match('%.sln[x]?$') ~= nil
+          end)
+
+          -- 2) Look for .csproj
+          if not root then
+            root = vim.fs.root(bufnr, function(fname)
+              return fname:match('%.csproj$') ~= nil
+            end)
+          end
+
+          -- 3) Fallback: file-based app — use file's parent directory
+          if not root then
+            root = vim.uv.fs_realpath(vim.fs.dirname(bufname))
+          end
+
+          if root then
+            cb(root)
+          end
+        end,
       })
 
-			vim.lsp.enable("omnisharp")
+      vim.lsp.enable("roslyn_ls")
 
       vim.lsp.config("fsautocomplete", {
         capabilities = capabilities,
@@ -338,50 +382,9 @@ return {
             end
           end
 
-					local omnisharp = require("omnisharp_extended")
+          vim.keymap.set("n", "gd", vim.lsp.buf.definition, { desc = "Go to definition", buffer = ev.buf })
 
-					if client.name == "omnisharp" then
+          vim.keymap.set("n", "gD", vim.lsp.buf.declaration, { desc = "Go to declaration", buffer = ev.buf })
-						vim.keymap.set(
-							"n",
-							"gd",
-							omnisharp.telescope_lsp_definition,
-							{ desc = "Go to definition", buffer = ev.buf }
-						)
-
-						vim.keymap.set(
-							"n",
-							"gi",
-							omnisharp.telescope_lsp_implementation,
-							{ desc = "Go to implementation", buffer = ev.buf }
-						)
-
-						vim.keymap.set(
-							"n",
-							"gr",
-							omnisharp.telescope_lsp_references,
-							{ desc = "Go to references", buffer = ev.buf }
-						)
-
-						vim.keymap.set(
-							"n",
-							"<leader>D",
-							omnisharp.telescope_lsp_type_definition,
-							{ desc = "Go to type definition", buffer = ev.buf }
-						)
-					else
-						vim.keymap.set(
-							"n",
-							"gd",
-							vim.lsp.buf.definition,
-							{ desc = "Go to definition", buffer = ev.buf }
-						)
-
-						vim.keymap.set(
-							"n",
-							"gD",
-							vim.lsp.buf.declaration,
-							{ desc = "Go to declaration", buffer = ev.buf }
-						)
 
           vim.keymap.set(
             "n",
@@ -390,13 +393,7 @@ return {
             { desc = "Go to implementation", buffer = ev.buf }
           )
 
-						vim.keymap.set(
+          vim.keymap.set("n", "gr", vim.lsp.buf.references, { desc = "Go to references", buffer = ev.buf })
-							"n",
-							"gr",
-							vim.lsp.buf.references,
-							{ desc = "Go to references", buffer = ev.buf }
-						)
-					end
 
           vim.api.nvim_create_autocmd({ "FileType" }, {
             callback = function()
@@ -472,7 +469,6 @@ return {
             vim.fn.setreg("+", table.concat(lines, "\n"))
 
             vim.notify(string.format("Copied %d diagnostics to clipboard", #diagnostics))
-
           end, { desc = "Copy buffer diagnostics to clipboard", buffer = ev.buf })
 
           vim.keymap.set("n", "K", vim.lsp.buf.hover, { desc = "Display symbol info", buffer = ev.buf })