feat(config): add helper function for formatters

lua/cosmic/config/config.lua

@@ -4,7 +4,11 @@ local config = {}
   servers = {
     eslint = false,
     efm = {
+      format = false -- disable formatting all together
       disable_formatters = {'eslint', 'prettier', 'stylua'}
+    },
+   tsserver = {
+      format = false,
    }
   }
 } ]]

lua/cosmic/config/init.lua

@@ -1,15 +1,28 @@
-local config = require('cosmic.config.config')
+local user_config = require('cosmic.config.config')
 
+-- these settings will be merged with any settings definined in config.lua
 local default_config = {
   lsp = {
     format_on_save = false,
     servers = {
-      eslint = true,
+      eslint = false,
       efm = {
-        disable_formatters = { 'eslint' },
+        format = true,
+        disable_formatters = {}, -- e.g. 'eslint', 'prettier', 'stylua'
       },
+      tsserver = {
+        format = false,
+      }
     },
   },
 }
 
-return vim.tbl_deep_extend('force', default_config, config)
+local config =  vim.tbl_deep_extend('force', default_config, user_config)
+
+-- default servers that can be formatted
+local formatting_servers = { 'efm', 'eslint', 'tsserver', 'sumneko_lua', 'rust_analyzer', 'gopls', 'pyright' }
+function default_config.lsp.can_client_format(client_name)
+  return (config.lsp.servers[client_name] and config.lsp.servers[client_name].format and vim.tbl_contains(formatting_servers, client_name))
+end
+
+return config

lua/cosmic/lsp/providers/defaults.lua

@@ -2,6 +2,7 @@ local config = require('cosmic.config')
 local M = {}
 
 local auto_format_lock = false;
+
 function M.on_attach(client, bufnr)
   local function buf_set_option(...)
     vim.api.nvim_buf_set_option(bufnr, ...)
@@ -10,10 +11,10 @@ function M.on_attach(client, bufnr)
   -- Enable completion triggered by <c-x><c-o>
   buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
 
-  local formatting_servers = { 'efm', 'eslint' }
-  if vim.tbl_contains(formatting_servers, client.name) then
+  if config.lsp.can_client_format(client.name) then
     client.resolved_capabilities.document_formatting = true
     client.resolved_capabilities.document_range_formatting = true
+    -- auto format on save
     if config.lsp.format_on_save and not auto_format_lock then
       auto_format_lock = true -- just run autocommand once
       vim.cmd([[

lua/cosmic/lsp/providers/efm.lua

@@ -23,17 +23,17 @@ formatters.prettier = {
 }
 
 local filetype_defaults = {
-  css = {},
-  html = {},
-  lua = {},
-  javascript = {},
-  javascriptreact = {},
-  json = {},
-  markdown = {},
-  scss = {},
-  typescript = {},
-  typescriptreact = {},
-  yaml = {},
+  'css',
+  'html',
+  'lua',
+  'javascript',
+  'javascriptreact',
+  'json',
+  'markdown',
+  'scss',
+  'typescript',
+  'typescriptreact',
+  'yaml',
 }
 
 formatters.defaults = {
@@ -61,6 +61,7 @@ formatters.defaults = {
 
 local languages = {}
 for formatter, filetypes in pairs(formatters.defaults) do
+  -- disable specific formatters
   if not vim.tbl_contains(config.lsp.servers.efm.disable_formatters, formatter) then
     for _, filetype in pairs(filetypes) do
       languages[filetype] = languages[filetype] or {}
@@ -69,9 +70,6 @@ for formatter, filetypes in pairs(formatters.defaults) do
   end
 end
 
--- print(vim.inspect(languages))
--- print(vim.inspect(languages['javascript']['prettier']))
-
 return {
   init_options = { documentFormatting = true, codeAction = true },
   root_dir = function(fname)
@@ -81,6 +79,6 @@ return {
       or util.root_pattern('.eslintrc.js')(fname)
       or util.root_pattern('tsconfig.json')(fname)
   end,
-  filetypes = vim.tbl_keys(filetype_defaults),
+  filetypes = filetype_defaults,
   settings = { languages = languages },
 }