👍 Add timeout feature to denops#plugin#wait()

Close #174

autoload/denops/plugin.vim

@@ -15,10 +15,23 @@ function! denops#plugin#wait(plugin, ...) abort
   endif
   let options = extend({
         \ 'interval': g:denops#plugin#wait_interval,
+        \ 'timeout': g:denops#plugin#wait_timeout,
         \}, a:0 ? a:1 : {},
         \)
   let expr = printf('sleep %dm', options.interval)
+  let t = options.timeout
+  let s = reltime()
   while !has_key(s:loaded_plugins, a:plugin)
+    if reltimefloat(reltime(s)) * 1000 > t
+      let m = printf(
+            \ "TimeoutError: '%s' took more than %d milliseconds to initialized",
+            \ a:plugin,
+            \ t,
+            \)
+      let s:loaded_plugins[a:plugin] = m
+      call s:echoerr(m)
+      return
+    endif
     execute expr
   endwhile
 endfunction
@@ -142,3 +155,4 @@ augroup denops_autoload_plugin_internal
 augroup END
 
 let g:denops#plugin#wait_interval = get(g:, 'denops#plugin#wait_interval', 10)
+let g:denops#plugin#wait_timeout = get(g:, 'denops#plugin#wait_timeout', 5000)

doc/denops.txt

@@ -96,6 +96,10 @@ VARIABLE						*denops-variable*
 	Interval in milliseconds for |denops#plugin#wait()|.
 	Default: 10
 
+*g:denops#plugin#wait_timeout*
+	Timeout in milliseconds for |denops#plugin#wait()|.
+	Default: 5000
+
 -----------------------------------------------------------------------------
 FUNCTION						*denops-function*