vim options

Characteristics of options

The value of an option is one (or more?) of

The scope of an option can be

An option has a full name and an abbreviation (or short name).

Each option with their characteristics is stored in a vimoption struct.

`:set all`	shows all options and their values.
`:set opt&`	reverts `opt` to its default value
`:set opt&vim`	reverts `opt` to default VIM value
`:set opt&vi`	to default vi value.
`:set all&`	sets all options to their default value.
`:set opt!`	toggle (invert) boolean options (such as `autoindent`).
`:set invOPT`	toggles (boolean) `OPT`. Same effect as `:set OPT!`.
`:set opt?`	displays the current value for the option.
`:set opt<`	Remove local value of an option so that global value will be used.
`:setl opt<`	Copy global value of an option to its local value.
`:set opt=…`, `:set opt:…`	Assigns a value to a number or text option. (Whitespace on left side of `=` or `:` is ignored, on right side, whitespace is not allowed because it separates it from the next assignment)
`:set opt+=…`	Add flag to flag option; increment number option by given value; append given value to text value
`:set opt-=…`
`:set op^+=…`	Multiply number value; prepend value to text value
`:options`	opens a window (or menu?) to choose options.

It is possible to set multiple values in one command:

:set ignorecase shiftwidth=4 autoindent

It's possible to set some options from so called modelines.

For security reasons, not all options can be modified in modelines. Such options are marked with the P_SECURE and/or P_NO_ML option flag.

Apparently, some options are hidden. Trying to :set them is ignored, and they're not printed.

… not sure what to make of this!

autoread	Automatically reload files whose content was changed outside of VIM.
autoindent
binary
bufhidden
buflisted
buftype
cindent
cinkeys	A list of keywords that start an extra indent when `smartindent` or `cindent` is set
cinwords
compatible
endofline
eventignore	a list of events that are ignored (not triggerd)
expandtab
fixendofline
helpfile
indentexpr
indentkeys
lisp
magic
paste	disables or resets some options so as to be able to paste text into a buffer
pastetoggle	key sequence that toggles the paste option.
revins
ruler
smartindent
showmatch
smarttab
softabstop
swapfile
textwidth
updatetime
vartabstop
wrapmargin
`foldtext` (see vim - folding text)