Include additional debugging info for 0% progress. #14

autoload/startuptime.vim

@@ -215,28 +215,7 @@ function! s:ExtractRequireArg(event) abort
   return a:event[9:-3]
 endfunction
 
-function! s:Profile(onfinish, onprogress, options, tries, file, items) abort
-  if !a:onprogress(a:tries)
-    return
-  endif
-  " Extract data when it's available (i.e., after the first call to Profile).
-  if a:tries <# a:options.tries
-    while 1
-      try
-        let l:items = s:Extract(a:file, a:options)
-        break
-      catch /^Vim:Interrupt$/
-        " Ignore interrupts. The loop will result in re-attempting to extract.
-        " The plugin can be interrupted by closing the window.
-      endtry
-    endwhile
-    call extend(a:items, l:items)
-    call delete(a:file)
-  endif
-  if a:tries ==# 0
-    call a:onfinish()
-    return
-  endif
+function! s:ProfileCmd(file) abort
   " * If timer_start() is available, vim is quit with a timer. This retains
   "   all events up to the last event, '--- VIM STARTED ---'.
   " * XXX: If timer_start() is not available, an autocmd is used. This retains
@@ -258,7 +237,7 @@ function! s:Profile(onfinish, onprogress, options, tries, file, items) abort
   let l:quit_cmd_timer = 'call timer_start(0, {-> execute(''qall!'')})'
   let l:quit_cmd_autocmd = 'autocmd VimEnter * qall!'
   let l:quit_cmd = printf(
-        \ 'if exists(''*timer_start'') | %s | else |  %s | endif',
+        \ 'if exists(''*timer_start'') | %s | else | %s | endif',
         \ l:quit_cmd_timer,
         \ l:quit_cmd_autocmd)
   let l:command = [
@@ -267,6 +246,32 @@ function! s:Profile(onfinish, onprogress, options, tries, file, items) abort
         \   '-c', l:quit_cmd
         \ ]
   call extend(l:command, g:startuptime_exe_args)
+  return l:command
+endfunction
+
+function! s:Profile(onfinish, onprogress, options, tries, file, items) abort
+  if !a:onprogress(a:tries)
+    return
+  endif
+  " Extract data when it's available (i.e., after the first call to Profile).
+  if a:tries <# a:options.tries
+    while 1
+      try
+        let l:items = s:Extract(a:file, a:options)
+        break
+      catch /^Vim:Interrupt$/
+        " Ignore interrupts. The loop will result in re-attempting to extract.
+        " The plugin can be interrupted by closing the window.
+      endtry
+    endwhile
+    call extend(a:items, l:items)
+    call delete(a:file)
+  endif
+  if a:tries ==# 0
+    call a:onfinish()
+    return
+  endif
+  let l:command = s:ProfileCmd(a:file)
   " The 'tmp' dict is used so a local function can be created.
   let l:tmp = {}
   let l:args = [a:onfinish, a:onprogress, a:options, a:tries - 1, a:file, a:items]
@@ -1081,10 +1086,22 @@ function! s:OnProgress(winid, bufnr, total, pending) abort
             \   '  ordinary startup, this could be problematic for vim-startuptime.',
             \   '  Running :messages within the nested (n)vim may help identify the',
             \   '  issue.',
+            \   '',
+            \   '  It may help to run a nested instance of (n)vim in a manner similar',
+            \   '  to vim-startuptime. The following lines show the shell-escaped',
+            \   '  program and arguments used by vim-startuptime. <OUTPUT> should be',
+            \   '  replaced with an output file.'
+            \ ]
+      let l:command = s:ProfileCmd('<OUTPUT>')
+      call add(l:lines, '    ' . shellescape(l:command[0]))
+      for l:line in l:command[1:]
+        call add(l:lines, '      ' . shellescape(l:line))
+      endfor
+      call extend(l:lines, [
             \   '',
             \   '  Try running vim-startuptime again once the problem is avoided via a',
             \   '  configuration update.',
-            \ ]
+            \ ])
       for l:line in l:lines
         call s:SetBufLine(a:bufnr, line('$') + 1, l:line)
       endfor