Refactor null-ls again

Now building a list of filetypes that already have language servers
configured and then excluding those filetypes from null-ls.

There is an override where they can be forced enabled for language
servers that may not have a formatter or where the null-ls formatter is
preferred. Eg. Python where I want to format with black.

neovim/lua/plugins/lsp.lua

@@ -186,19 +186,13 @@ function M.config_lsp()
     utils.try_require("lspconfig", function(lsp_config)
         local capabilities = merged_capabilities()
 
-        -- Config null-ls
-        require("plugins.null-ls").configure({ capabilities = capabilities, on_attach = get_default_attach() })
-
-        -- Attach options to disable formatting
-        local no_format = { document_formatting = false, document_range_formatting = false }
-
         -- Configure each server
         lsp_config.bashls.setup({ capabilities = capabilities, on_attach = get_default_attach() })
-        lsp_config.gopls.setup({ capabilities = capabilities, on_attach = get_default_attach(no_format) })
-        lsp_config.pyright.setup({ capabilities = capabilities, on_attach = get_default_attach(no_format) })
+        lsp_config.gopls.setup({ capabilities = capabilities, on_attach = get_default_attach() })
+        lsp_config.pyright.setup({ capabilities = capabilities, on_attach = get_default_attach() })
         lsp_config.rls.setup({
             capabilities = capabilities,
-            on_attach = get_default_attach(no_format),
+            on_attach = get_default_attach(),
             settings = {
                 rust = {
                     build_on_save = false,
@@ -207,6 +201,9 @@ function M.config_lsp()
                 },
             },
         })
+
+        -- Config null-ls after lsps so we can disable for languages that have language servers
+        require("plugins.null-ls").configure({ capabilities = capabilities, on_attach = get_default_attach() })
     end)
 end
 

neovim/lua/plugins/null-ls/init.lua

@@ -3,12 +3,19 @@ local utils = require("utils")
 
 function M.configure(options)
     utils.try_require("null-ls", function(null_ls)
-        -- Load newer versions of plugins
-        local alex = require("plugins.null-ls.linters").alex
-        local ansiblelint = require("plugins.null-ls.linters").ansiblelint
+        -- Aggregate filetypes with language servers
+        local server_filetypes = {}
+        utils.try_require("lspconfig", function(lsp_config)
+            vim.tbl_map(function(server)
+                vim.list_extend(server_filetypes, lsp_config[server].filetypes)
+            end, lsp_config.available_servers())
+        end)
 
-        -- Use ansiblelint for only ansible files
-        -- null_ls.builtins.diagnostics.ansiblelint.filetypes = { "yaml.ansible" }
+        -- Remove filetypes for Language servers I want to override
+        local override_filetypes = { "python" }
+        server_filetypes = vim.tbl_filter(function(ft)
+            return not vim.tbl_contains(override_filetypes, ft)
+        end, server_filetypes)
 
         local sources = {
             -- Generic
@@ -23,20 +30,15 @@ function M.configure(options)
             null_ls.builtins.diagnostics.mypy,
             -- Go
             null_ls.builtins.diagnostics.golangci_lint,
-            null_ls.builtins.formatting.gofmt,
             -- Text
             null_ls.builtins.code_actions.proselint,
             null_ls.builtins.diagnostics.proselint,
             null_ls.builtins.diagnostics.write_good,
             -- null_ls.builtins.diagnostics.alex
-            alex,
             -- Ansible
-            -- null_ls.builtins.diagnostics.ansiblelint,
-            ansiblelint,
+            -- null_ls.builtins.diagnostics.ansiblelint.with({filetypes={"yaml.ansible"}}),
             -- Shell
             null_ls.builtins.diagnostics.shellcheck,
-            -- Rust
-            null_ls.builtins.formatting.rustfmt,
             -- Lua
             null_ls.builtins.diagnostics.luacheck,
             null_ls.builtins.formatting.stylua,
@@ -44,6 +46,18 @@ function M.configure(options)
             null_ls.builtins.diagnostics.hadolint,
         }
 
+        -- Map disabled filetypes onto list of sources
+        vim.tbl_map(function(builtin)
+            return builtin.with({ disabled_filetypes = server_filetypes })
+        end, sources)
+
+        -- Add custom or modified sources
+        vim.list_extend(sources, {
+            require("plugins.null-ls.linters").alex,
+            require("plugins.null-ls.linters").ansiblelint,
+        })
+
+        -- Setup or configure null_ls
         if null_ls["setup"] ~= nil then
             options.sources = sources
             null_ls.setup(options)