when 'foldmethod' is "indent"
'foldlevel' 'fdl' close folds with a level higher than this
'foldlevelstart' 'fdls' 'foldlevel' when starting to edit a file
'foldmarker' 'fmr' markers used when 'foldmethod' is "marker"
'foldmethod' 'fdm' folding type
'foldminlines' 'fml' minimum number of lines for a fold to be closed
'foldnestmax' 'fdn' maximum fold depth
'foldopen' 'fdo' for which commands a fold will be opened
'foldtext' 'fdt' expression used to display for a closed fold
'formatexpr' 'fex' expression used with "gq" command
'formatlistpat' 'flp' pattern used to recognize a list header
'formatoptions' 'fo' how automatic formatting is to be done
'formatprg' 'fp' name of external program used with "gq" command
'fsync' 'fs' whether to invoke fsync() after file write
'gdefault' 'gd' the ":substitute" flag 'g' is default on
'grepformat' 'gfm' format of 'grepprg' output
'grepprg' 'gp' program to use for ":grep"
'guicursor' 'gcr' GUI: settings for cursor shape and blinking
'guifont' 'gfn' GUI: Name(s) of font(s) to be used
'guifontwide' 'gfw' list of font names for double-wide characters
'guioptions' 'go' GUI: Which components and options are used
'guitablabel' 'gtl' GUI: custom label for a tab page
'guitabtooltip' 'gtt' GUI: custom tooltip for a tab page
'helpfile' 'hf' full path name of the main help file
'helpheight' 'hh' minimum height of a new help window
'helplang' 'hlg' preferred help languages
'hidden' 'hid' don't unload buffer when it is |abandon|ed
'history' 'hi' number of command-lines that are remembered
'hlsearch' 'hls' highlight matches with last search pattern
'icon' let Vim set the text of the window icon
'iconstring' string to use for the Vim icon text
'ignorecase' 'ic' ignore case in search patterns
'imcmdline' 'imc' use IM when starting to edit a command line
'imdisable' 'imd' do not use the IM in any mode
'iminsert' 'imi' use :lmap or IM in Insert mode
'imsearch' 'ims' use :lmap or IM when typing a search pattern
'include' 'inc' pattern to be used to find an include file
'includeexpr' 'inex' expression used to process an include line
'incsearch' 'is' highlight match while typing search pattern
'indentexpr' 'inde' expression used to obtain the indent of a line
'indentkeys' 'indk' keys that trigger indenting with 'indentexpr'
'infercase' 'inf' adjust case of match for keyword completion
'isfname' 'isf' characters included in file names and pathnames
'isident' 'isi' characters included in identifiers
'iskeyword' 'isk' characters included in keywords
'isprint' 'isp' printable characters
'joinspaces' 'js' two spaces after a period with a join command
'jumpoptions' 'jop' specifies how jumping is done
'keymap' 'kmp' name of a keyboard mapping
'keymodel' 'km' enable starting/stopping selection with keys
'keywordprg' 'kp' program to use for the "K" command
'langmap' 'lmap' alphabetic characters for other language mode
'langmenu' 'lm' language to be used for the menus
'langremap' 'lrm' do apply 'langmap' to mapped characters
'laststatus' 'ls' tells when last window has status lines
'lazyredraw' 'lz' don't redraw while executing macros
'lhistory' 'lhi' maximum number of location lists in history
'linebreak' 'lbr' wrap long lines at a blank
'lines' number of lines in the display
'linespace' 'lsp' number of pixel lines to use between characters
'lisp' automatic indenting for Lisp
'lispoptions' 'lop' changes how Lisp indenting is done
'lispwords' 'lw' words that change how lisp indenting works
'list' show <Tab> and <EOL>
'listchars' 'lcs' characters for displaying in list mode
'loadplugins' 'lpl' load plugin scripts when starting up
'magic' changes