Improve denops check

autoload/ddu.vim

@@ -20,24 +20,41 @@ function! ddu#get_item_actions(name, items) abort
   return ddu#_request('getItemActions', [a:name, a:items])
 endfunction
 
-function! ddu#_request(name, args) abort
-  if s:init(a:name)
+function! ddu#_request(method, args) abort
+  if s:init()
+    return {}
+  endif
+
+  " Note: If call denops#plugin#wait() in vim_starting, freezed!
+  if denops#server#status() !=# 'running' && has('vim_starting')
+    call ddu#util#print_error(
+          \ printf('You cannot call "%s" before denops.vim initialized.',
+          \        a:method))
     return {}
   endif
 
   call denops#plugin#wait('ddu')
-  return denops#request('ddu', a:name, a:args)
+  return denops#request('ddu', a:method, a:args)
 endfunction
-function! ddu#_notify(name, args) abort
-  if s:init(a:name)
+function! ddu#_notify(method, args) abort
+  if s:init()
     return {}
   endif
 
-  call denops#plugin#wait('ddu')
-  return denops#notify('ddu', a:name, a:args)
+  if ddu#_denops_running()
+    call denops#plugin#wait('ddu')
+    call denops#notify('ddu', a:method, a:args)
+  else
+    " Lazy call notify
+    execute printf('autocmd User DDUReady call ' .
+          \ 'denops#notify("ddu", "%s", %s)',
+          \ a:method, string(a:args))
+  endif
+
+  return {}
 endfunction
 
-function! s:init(name) abort
+function! s:init() abort
   if exists('g:ddu#_initialized')
     return
   endif
@@ -60,13 +77,6 @@ function! s:init(name) abort
   else
     autocmd ddu User DenopsReady silent! call ddu#_register()
   endif
-
-  " Note: If call denops#plugin#wait() in vim_starting, freezed!
-  if denops#server#status() !=# 'running' && has('vim_starting')
-    call ddu#util#print_error(
-          \ printf('You cannot call "%s" before denops initialized.', a:name))
-    return 1
-  endif
 endfunction
 
 let s:root_dir = fnamemodify(expand('<sfile>'), ':h:h')

autoload/ddu/custom.vim

@@ -3,21 +3,21 @@ function! ddu#custom#patch_global(key_or_dict, ...) abort
     call ddu#util#print_error('The args is too much: ' . string(a:000))
   endif
   let dict = s:normalize_key_or_dict(a:key_or_dict, get(a:000, 0, ''))
-  call s:notify('patchGlobal', [dict])
+  call ddu#_notify('patchGlobal', [dict])
 endfunction
 function! ddu#custom#patch_local(name, key_or_dict, ...) abort
   if a:0 > 1
     call ddu#util#print_error('The args is too much: ' . string(a:000))
   endif
   let dict = s:normalize_key_or_dict(a:key_or_dict, get(a:000, 0, ''))
-  call s:notify('patchLocal', [dict, a:name])
+  call ddu#_notify('patchLocal', [dict, a:name])
 endfunction
 
 function! ddu#custom#set_global(dict) abort
-  call s:notify('setGlobal', [a:dict])
+  call ddu#_notify('setGlobal', [a:dict])
 endfunction
 function! ddu#custom#set_local(name, dict) abort
-  call s:notify('setLocal', [a:dict, a:name])
+  call ddu#_notify('setLocal', [a:dict, a:name])
 endfunction
 
 let s:aliases = { 'ui': {}, 'source': {}, 'filter': {}, 'kind': {} }
@@ -28,7 +28,7 @@ function! ddu#custom#alias(type, alias, base) abort
   endif
 
   let s:aliases[a:type][a:alias] = a:base
-  call s:notify('alias', [a:type, a:alias, a:base])
+  call ddu#_notify('alias', [a:type, a:alias, a:base])
 endfunction
 
 let s:custom_actions = {}
@@ -41,7 +41,7 @@ function! ddu#custom#action(type, source_kind_name, action_name, func) abort
     let s:custom_actions[string(a:func)] = a:func
   endfor
 
-  call s:notify('patchGlobal', [
+  call ddu#_notify('patchGlobal', [
         \ a:type ==# 'source' ?
         \ { 'sourceOptions': dict } : { 'kindOptions': dict }
         \ ])
@@ -64,16 +64,6 @@ function! ddu#custom#get_aliases() abort
   return s:aliases
 endfunction
 
-function! s:notify(method, args) abort
-  if ddu#_denops_running()
-    call denops#notify('ddu', a:method, a:args)
-  else
-    execute printf('autocmd User DDUReady call ' .
-          \ 'denops#notify("ddu", "%s", %s)',
-          \ a:method, string(a:args))
-  endif
-endfunction
-
 function! s:normalize_key_or_dict(key_or_dict, value) abort
   if type(a:key_or_dict) == v:t_dict
     return a:key_or_dict