Add command completion.

Author: dstein64

autoload/startuptime.vim

@@ -838,6 +838,9 @@ function! s:Options(args) abort
         \   'tries': g:startuptime_tries,
         \ }
   let l:idx = 0
+  " WARN: Any new/removed/changed arguments below should have corresponding
+  " updates below in the startuptime#CompleteOptions function and the
+  " startuptime#StartupTime usage documentation.
   while l:idx <# len(a:args)
     let l:arg = a:args[l:idx]
     if l:arg ==# '--help'
@@ -870,6 +873,21 @@ function! s:Options(args) abort
   return l:options
 endfunction
 
+" A 'custom' completion function for :StartupTime. A 'custom' function is used
+" instead of a 'customlist' function, for the automatic filtering that is
+" conducted for the former, but not the latter.
+function! startuptime#CompleteOptions(...) abort
+  let l:args = [
+        \   '--help',
+        \   '--other-events', '--no-other-events',
+        \   '--self', '--no-self',
+        \   '--sort', '--no-sort',
+        \   '--sourcing-events', '--no-sourcing-events',
+        \   '--tries',
+        \ ]
+  return join(l:args, "\n")
+endfunction
+
 " Usage:
 "   :StartupTime
 "          \ [--sort] [--no-sort]

plugin/startuptime.vim

@@ -7,7 +7,7 @@ let s:save_cpo = &cpo
 set cpo&vim
 
 if !exists(':StartupTime')
-  command -nargs=* StartupTime
+  command -nargs=* -complete=custom,startuptime#CompleteOptions StartupTime
         \ :call startuptime#StartupTime(<q-mods>, <f-args>)
 endif