Suggested autocmd to update packer_compiled.vim when saving the configuration has got some problems

[sdondley]

In the main README, it's the following autocmd is suggested to update the packer_compiled.vim file to avoid the tedium of reloading the file and running the PackerCompile command:

augroup packer_user_config
  autocmd!
  autocmd BufWritePost plugins.lua source <afile> | PackerCompile 
augroup end

This works with a simple write, but if you do a write and quite immediately with :wq, the asynchronous PackerCompile command never completes it's operation and nothing gets saved. I created a simple hack to the autocmd as a workaround:

augroup packer_user_config
  autocmd!
  autocmd BufWritePost plugins.lua source <afile> | PackerCompile 
  autocmd BufWinLeave plugins.lua sleep 50m
augroup end

This inserts a 50 ms delay which should be plenty of time for PackerCompile to do its thing.

Not sure if there is a more robust way or not. But documentation should probably mention the problem. I lost quite a bit of time trying to figure out why it wasn't working.

Also, another thing that tripped me up is that the save wasn't working if I edited the file from outside of the plugins directory. This problem can be avoided by throwing */ in front of the file name:

augroup packer_user_config
  autocmd!
  autocmd BufWritePost */plugins.lua source <afile> | PackerCompile 
  autocmd BufWinLeave */plugins.lua sleep 50m
augroup end

Would probably be a good idea to change that in the documentation.