feat(lsp): handle disabled code actions (#34453)

This commit also makes it so that disabled code actions are not
displayed unless the trigger kind is "Invoked".

runtime/doc/news.txt

@@ -174,6 +174,7 @@ LSP
 • Incremental selection is now supported via `textDocument/selectionRange`.
   `an` selects outwards and `in` selects inwards.
 • Support for multiline semantic tokens.
+• Support for the `disabled` field on code actions.
 
 LUA
 

runtime/lua/vim/lsp/buf.lua

@@ -1141,7 +1141,8 @@ local function on_code_action_results(results, opts)
   ---@param a lsp.Command|lsp.CodeAction
   local function action_filter(a)
     -- filter by specified action kind
-    if opts and opts.context and opts.context.only then
+    if opts and opts.context then
+      if opts.context.only then
         if not a.kind then
           return false
         end
@@ -1158,6 +1159,11 @@ local function on_code_action_results(results, opts)
           return false
         end
       end
+      -- Only show disabled code actions when the trigger kind is "Invoked".
+      if a.disabled and opts.context.triggerKind ~= lsp.protocol.CodeActionTriggerKind.Invoked then
+        return false
+      end
+    end
     -- filter by user function
     if opts and opts.filter and not opts.filter(a) then
       return false
@@ -1223,6 +1229,11 @@ local function on_code_action_results(results, opts)
       return
     end
 
+    if action.disabled then
+      vim.notify(action.disabled.reason, vim.log.levels.ERROR)
+      return
+    end
+
     if not (action.edit and action.command) and client:supports_method(ms.codeAction_resolve) then
       client:request(ms.codeAction_resolve, action, function(err, resolved_action)
         if err then
@@ -1253,6 +1264,10 @@ local function on_code_action_results(results, opts)
     local clients = lsp.get_clients({ bufnr = item.ctx.bufnr })
     local title = item.action.title:gsub('\r\n', '\\r\\n'):gsub('\n', '\\n')
 
+    if item.action.disabled then
+      title = title .. ' (disabled)'
+    end
+
     if #clients == 1 then
       return title
     end

runtime/lua/vim/lsp/protocol.lua

@@ -430,6 +430,7 @@ function protocol.make_client_capabilities()
         resolveSupport = {
           properties = { 'edit', 'command' },
         },
+        disabledSupport = true,
       },
       codeLens = {
         dynamicRegistration = false,

test/functional/plugin/lsp_spec.lua

@@ -4718,6 +4718,70 @@ describe('LSP', function()
       eq('workspace/executeCommand', result[5].method)
       eq('command:1', result[5].params.command)
     end)
+
+    it('supports disabled actions', function()
+      exec_lua(create_server_definition)
+      local result = exec_lua(function()
+        local server = _G._create_server({
+          capabilities = {
+            executeCommandProvider = {
+              commands = { 'command:1' },
+            },
+            codeActionProvider = {
+              resolveProvider = true,
+            },
+          },
+          handlers = {
+            ['textDocument/codeAction'] = function(_, _, callback)
+              callback(nil, {
+                {
+                  title = 'Code Action 1',
+                  disabled = {
+                    reason = 'This action is disabled',
+                  },
+                },
+              })
+            end,
+            ['codeAction/resolve'] = function(_, _, callback)
+              callback(nil, {
+                title = 'Code Action 1',
+                command = {
+                  title = 'Command 1',
+                  command = 'command:1',
+                },
+              })
+            end,
+          },
+        })
+
+        local client_id = assert(vim.lsp.start({
+          name = 'dummy',
+          cmd = server.cmd,
+        }))
+
+        --- @diagnostic disable-next-line:duplicate-set-field
+        vim.notify = function(message, code)
+          server.messages[#server.messages + 1] = {
+            params = {
+              message = message,
+              code = code,
+            },
+          }
+        end
+
+        vim.lsp.buf.code_action({ apply = true })
+        vim.lsp.stop_client(client_id)
+        return server.messages
+      end)
+      eq(
+        exec_lua(function()
+          return { message = 'This action is disabled', code = vim.log.levels.ERROR }
+        end),
+        result[4].params
+      )
+      -- No command is resolved/applied after selecting a disabled code action
+      eq('shutdown', result[5].method)
+    end)
   end)
 
   describe('vim.lsp.commands', function()