How to wait for VIM to finish parsing document?

I'm writing a small Vimscript that will open a number of files, indent them (gg=G), and then save them.

I've noticed that oftentimes, the first couple of files do not get indented correctly, even if the command works fine when executed manually. It looks as if the indentation command is being executed before the file is fully parsed, or perhaps before the syntax plugin finishes loading.

I've tried adding a manual "sleep" to the beginning of the command, but this doesn't seem to make a difference.

Anyone know what might be causing this issue, and how I can force VIM to finish loading plugins / parsing before the command runs?

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