Got cfn working nicely

filetype.lua

@@ -0,0 +1,18 @@
+vim.filetype.add {
+  pattern = {
+    ['.*'] = {
+      priority = math.huge,
+      function(path, bufnr)
+        local line1 = vim.filetype.getlines(bufnr, 1)
+        local line2 = vim.filetype.getlines(bufnr, 2)
+        if vim.filetype.matchregex(line1, [[^AWSTemplateFormatVersion]] ) or
+        vim.filetype.matchregex(line2, [[^AWSTemplateFormatVersion]] ) then
+          return 'yaml.cloudformation'
+        elseif vim.filetype.matchregex(line1, [[["']AWSTemplateFormatVersion]] ) or
+		   vim.filetype.matchregex(line2, [[["']AWSTemplateFormatVersion]] ) then
+          return 'json.cloudformation'
+        end
+      end,
+    },
+  },
+}

init.lua

@@ -172,6 +172,9 @@ require('lazy').setup({
     end,
   },
 
+  'b0o/schemastore',
+  'mfussenegger/nvim-lint',
+
   -- NOTE: Next Step on Your Neovim Journey: Add/Configure additional "plugins" for kickstart
   --       These are some example plugins that I've included in the kickstart repository.
   --       Uncomment any of the lines below to enable them.
@@ -288,7 +291,7 @@ vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { de
 -- See `:help nvim-treesitter`
 require('nvim-treesitter.configs').setup {
   -- Add languages to be installed here that you want installed for treesitter
-  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'tsx', 'typescript', 'help', 'vim' },
+  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'tsx', 'typescript', 'vimdoc', 'vim' },
 
   -- Autoinstall languages that are not installed. Defaults to false (but you can change for yourself!)
   auto_install = false,
@@ -416,6 +419,7 @@ local servers = {
   tflint = {},
   terraformls = {},
   eslint = {},
+  --yamlls = {},
 
   lua_ls = {
     Lua = {
@@ -452,6 +456,59 @@ mason_lspconfig.setup_handlers {
   end,
 }
 
+require'lspconfig'.yamlls.setup {
+  on_attach = on_attach,
+  filetypes = { "yaml", "yaml.cloudformation" },
+  flags = { debounce_test_changes = 150 },
+  capabilities = capabilities,
+  settings = {
+      yaml = {
+          format = {
+              enable = true,
+              singleQuote = true,
+              printWidth = 120,
+          },
+          hover = true,
+          completion = true,
+          customTags = {
+            "!fn",
+        		"!And",
+        		"!If",
+        		"!Not",
+        		"!Equals",
+        		"!Or",
+        		"!FindInMap sequence",
+        		"!Base64",
+        		"!Cidr",
+        		"!Ref",
+        		"!Ref scalar",
+        		"!Sub",
+        		"!GetAtt",
+        		"!GetAZs",
+        		"!ImportValue",
+        		"!Select",
+        		"!Split",
+        		"!Join sequence"
+          },
+          validate = true,
+          schemas = {
+              ["https://raw.githubusercontent.com/awslabs/goformation/v6.10.0/schema/cloudformation.schema.json"] = {
+                  "/cloudformation.yml",
+                  "/cloudformation.yaml",
+                  "/cloudformation.template.yml",
+                  "/cloudformation.template.yaml",
+                  "/*.cf.yml",
+                  "/cf.yaml",
+              },
+          },
+          schemaStore = {
+              enable = true,
+              url = "https://www.schemastore.org/json",
+          },
+      },
+  },
+}
+
 -- nvim-cmp setup
 local cmp = require 'cmp'
 local luasnip = require 'luasnip'
@@ -497,6 +554,32 @@ cmp.setup {
   },
 }
 
+setupLinter = function (name)
+  --require('lint').try_lint(name)
+  local lintcmd = "lua require('lint').try_lint('" .. name .. "')"
+  vim.cmd(lintcmd)
+  vim.api.nvim_create_autocmd("BufWritePost", {
+    --command = "silent! lua require('lint').try_lint(" .. name .. ")",
+    command = lintcmd,
+    desc = "Adding linter " .. name
+  })
+end
+-- setup linting for Cloudformation cfn_lint
+vim.api.nvim_create_autocmd({'BufReadPost'}, {
+  pattern = {
+    '*.cf.json',
+    '*.cf.yml',
+    '*.cf.yaml',
+    'cloudformation.template.yml',
+    'cloudformation.template.yaml',
+    'cloudformation.json',
+    'cloudformation.yaml',
+    'cloudformation.yml'
+  },
+  command = "lua setupLinter('cfn_lint')",
+  desc = 'Adding linting command for Cloudformation files with cfn_lint'
+})
+
 -- The line beneath this is called `modeline`. See `:help modeline`
 -- vim: ts=2 sts=2 sw=2 et