Vim indenting

Documentation

$VIMRUNTIME/indent/README.txt	https://github.com/vim/vim/blob/master/runtime/indent/README.txt
:h indent.txt

Settings

auto-indent is managed by the following options

set ai?   "autoindent  # auto indentation
set cin?  "cindent     # configurable, character-insertion based indentation
set cink? "cinkeys     # keys that when typed in insert-mode, cause re-indentation when 'indentexpr' is not set
set cino?
set si?   "smartindent # indentation when starting new line
set inde?
set indk? "indentkeys  # keys that when typed in insert-mode, cause re-indentation when 'indentexpr' is set