如何正确地重新加载.vimrc文件，使其等于重新启动vim？

Question

I use MacVim and in my .vimrc file I have map ,V :source $MYVIMRC<CR> binding that allows me to apply the newest version of .vimrc in a case it was recently modified. However I noticed that strange things can happen, relaunch can slow down vim and some plugins can start to conflict after pressing ,V , when everything works fine if I just close and relaunch MacVim from the scratch.

I'd be very thankful if you could give me a hint on the reason of this behavior as I'd like to have a possibility to update .vimrc file that will completely clear internal vim state and grab new configuration file

Answer 1

The only viable way to re-apply your config to a pristine Vim is actually to restart it.

But the most likely cause of slow downs is the overuse/misuse of autocommands.

Autocommands are added without checking for existing ones. One consequence is that they tend to pile-up if you don't manage them properly and every individual autocommand corresponding to a specific event is executed when that event is triggered, leading to dreadful slow downs.

Here are the two ways you are supposed to use autocommands in your vimrc :

Method #1

" anywhere
augroup nameofthegroup
    autocmd!
    autocmd EventName pattern commandtoexecute
    autocmd AnotherEventName anotherpattern anothercommandtoexecute
augroup END

Method #2

" near the top of your vimrc
augroup nameofthegroup
    autocmd!
augroup END

" anywhere
autocmd nameofthegroup EventName pattern commandtoexecute
autocmd nameofthegroup AnotherEventName anotherpattern anothercommandtoexecute

The idea is to create a group of autocommands that clears itself whenever it is invoked and thus prevents them from piling-up.