autocmd thing

tell me about autocommands


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test/functional/autocmd/cmdline_spec.lua
test/functional/autocmd/show_spec.lua
test/old/testdir/test_cmdline.vim
test/functional/autocmd/autocmd_spec.lua
test/functional/autocmd/textyankpost_spec.lua
test/functional/legacy/autocmd_option_spec.lua
test/functional/autocmd/filetype_spec.lua
test/old/testdir/test_quickfix.vim
runtime/doc/autocmd.txt
runtime/doc/usr_40.txt
README.md
Autocommands are commands that are automatically executed when some event occurs.Some examples of events are:

BufReadPost: After reading a buffer (opening a file)
BufWritePost: After writing a buffer (saving a file)
BufEnter: When entering a buffer
BufLeave: When leaving a buffer
BufNewFile: When creating a new file
Autocommands allow you to automatically execute commands when these events occur. For example:

Set options for certain file types:
autocmd FileType c set shiftwidth=4 softtabstop=4
Automatically source a file when entering a buffer:
autocmd BufEnter *.{py,c,cpp} source ~/.config/nvim/abbrevs.vim
Automatically save on focus lost:
autocmd FocusLost * :wa 
Some other uses of autocommands are:

Syntax highlighting
Indentation
Filetype detection
Autocommands are defined using the :autocmd command. The basic syntax is:

:autocmd {event} {pattern} {command}
{event} is the event that triggers the autocommand (like BufReadPost)
{pattern} is a file pattern that filters which buffers the autocommand applies to
{command} is the command to execute when the event occurs
Autocommands allow you to customize and automate a lot of Vim's behavior. They are a very powerful feature of Vim.