Re: increasing/reducing the number of leading white spaces dynamically

that trigger on BufWritePre and BufWritePost, something like (untested)

 autocmd BufWritePre *.py %s/^\( \{8}\)\+/\=substitute(submatch(0), repeat(' ', 8), repeat(' ', 4), 'g')

 autocmd BufWritePost *.py %s/^\( \{4}\)\+/\=substitute(submatch(0), repeat(' ', 4), repeat(' ', 8), 'g')

OK. The key thing is autocmd. Now I have something to start with.

However, looking at these two things, I get confused.
The first one makes sense. Just before "saving" the buffer on disk it changes 8 spaces by 4. Good.
But the second one ... shouldn't it be something like BufRead<whatever> in order to expand 4 spaces to 8 when I start editing the file?

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