Check lsp client capabilties before formatting

archlinux.yml

@@ -18,7 +18,11 @@
     - common
   tasks:
     - import_tasks: 'tasks/dotfiles.yml'
-    - import_tasks: 'tasks/neovim.yml'
+
+    - name: Include neovim tasks
+      import_tasks: 'tasks/neovim.yml'
+      tags: neovim
+
     - name: gather package facts
       package_facts:
         manager: pacman

templates/nvim/lua/lsp.lua.j2

@@ -159,7 +159,6 @@ vim.diagnostic.config({
 
 local enable_formatting = os.getenv("ENABLE_FORMATTING", False)
 
--- TODO: fix error message: [LSP] Format request failed, no matching language servers.
 -- format buffers before saving for specific LSPs
 if (enable_formatting) then
   local excluded_clients = { 'pyright' }
@@ -172,6 +171,7 @@ if (enable_formatting) then
         callback = function()
           vim.lsp.buf.format {
             filter = function(client)
+              if not client.supports_method('textDocument/formatting') then return end
               return not vim.list_contains(excluded_clients, client.name)
             end,
             async = false,