refactor!: make unsued util functions private

If any public function is not used by any configuration, then we can
simply make them private. It is possible that there are external uses of
these functions, but a preliminary search indicated that usage is small
to non-existent.

Functions that are privatized:
- get_active_clients_list_by_ft
- get_config_by_ft
- get_other_matching_providers

Work on neovim#2079.

lua/lspconfig/health.lua

@@ -220,6 +220,38 @@ local function make_client_info(client, fname)
   return table.concat(info_lines, '\n')
 end
 
+local function get_active_clients_list_by_ft(filetype)
+  local clients = M.get_lsp_clients()
+  local clients_list = {}
+  for _, client in pairs(clients) do
+    --- @diagnostic disable-next-line:undefined-field
+    local filetypes = client.config.filetypes or {}
+    for _, ft in pairs(filetypes) do
+      if ft == filetype then
+        table.insert(clients_list, client.name)
+      end
+    end
+  end
+  return clients_list
+end
+
+local function get_other_matching_providers(filetype)
+  local configs = require 'lspconfig.configs'
+  local active_clients_list = get_active_clients_list_by_ft(filetype)
+  local other_matching_configs = {}
+  for _, config in pairs(configs) do
+    if not vim.tbl_contains(active_clients_list, config.name) then
+      local filetypes = config.filetypes or {}
+      for _, ft in pairs(filetypes) do
+        if ft == filetype then
+          table.insert(other_matching_configs, config)
+        end
+      end
+    end
+  end
+  return other_matching_configs
+end
+
 local function check_lspconfig(bufnr)
   bufnr = (bufnr and bufnr ~= -1) and bufnr or nil
 
@@ -267,7 +299,7 @@ local function check_lspconfig(bufnr)
     end
   end
 
-  local other_matching_configs = not bufnr and {} or util.get_other_matching_providers(buffer_filetype)
+  local other_matching_configs = not bufnr and {} or get_other_matching_providers(buffer_filetype)
   if not vim.tbl_isempty(other_matching_configs) then
     health.info(('Other clients that match the "%s" filetype:'):format(buffer_filetype))
     for _, config in ipairs(other_matching_configs) do

lua/lspconfig/util.lua

@@ -208,52 +208,6 @@ function M.insert_package_json(config_files, field, fname)
   return config_files
 end
 
-function M.get_active_clients_list_by_ft(filetype)
-  local clients = M.get_lsp_clients()
-  local clients_list = {}
-  for _, client in pairs(clients) do
-    --- @diagnostic disable-next-line:undefined-field
-    local filetypes = client.config.filetypes or {}
-    for _, ft in pairs(filetypes) do
-      if ft == filetype then
-        table.insert(clients_list, client.name)
-      end
-    end
-  end
-  return clients_list
-end
-
-function M.get_other_matching_providers(filetype)
-  local configs = require 'lspconfig.configs'
-  local active_clients_list = M.get_active_clients_list_by_ft(filetype)
-  local other_matching_configs = {}
-  for _, config in pairs(configs) do
-    if not vim.tbl_contains(active_clients_list, config.name) then
-      local filetypes = config.filetypes or {}
-      for _, ft in pairs(filetypes) do
-        if ft == filetype then
-          table.insert(other_matching_configs, config)
-        end
-      end
-    end
-  end
-  return other_matching_configs
-end
-
-function M.get_config_by_ft(filetype)
-  local configs = require 'lspconfig.configs'
-  local matching_configs = {}
-  for _, config in pairs(configs) do
-    local filetypes = config.filetypes or {}
-    for _, ft in pairs(filetypes) do
-      if ft == filetype then
-        table.insert(matching_configs, config)
-      end
-    end
-  end
-  return matching_configs
-end
-
 function M.get_active_client_by_name(bufnr, servername)
   --TODO(glepnir): remove this for loop when we want only support 0.10+
   for _, client in pairs(M.get_lsp_clients { bufnr = bufnr }) do

plugin/lspconfig.lua

@@ -63,6 +63,20 @@ local get_clients_from_cmd_args = function(arg)
   return result
 end
 
+local function get_config_by_ft(filetype)
+  local configs = require 'lspconfig.configs'
+  local matching_configs = {}
+  for _, config in pairs(configs) do
+    local filetypes = config.filetypes or {}
+    for _, ft in pairs(filetypes) do
+      if ft == filetype then
+        table.insert(matching_configs, config)
+      end
+    end
+  end
+  return matching_configs
+end
+
 -- Called from plugin/lspconfig.vim because it requires knowing that the last
 -- script in scriptnames to be executed is lspconfig.
 api.nvim_create_user_command('LspInfo', ':che lspconfig', { desc = 'Deprecated alias to `:che lspconfig`' })
@@ -77,7 +91,7 @@ api.nvim_create_user_command('LspStart', function(info)
     end
   end
 
-  local matching_configs = util.get_config_by_ft(vim.bo.filetype)
+  local matching_configs = get_config_by_ft(vim.bo.filetype)
   for _, config in ipairs(matching_configs) do
     config.launch()
   end