kakoune/doc/pages/scopes.asciidoc

= Scopes

== Description

Scopes are groups in which a particular Kakoune object (a variable,
hook, alias etc) can have different values, depending on the group the
value was declared in.

== Names and hierarchy

Scopes are named as follows:

*window*::
    context linked to the window displaying a buffer
*buffer*::
    context linked directly to the buffer
*global*::
    global context linked to the instance of Kakoune

The following order of priority applies to the above scopes:

--------------------------
window ]> buffer ]> global
--------------------------

The above priority line implies that objects can have individual values that
will be resolved first in the *window* scope (highest priority), then in
the *buffer* scope, and finally in the *global* scope (lowest priority).

== Uses

The scope paradigm is very useful as it allows the user to customize the
behavior of the editor without modifying the configuration globally, as
is the case with other editors who only have a single *global* scope by
default.

Examples:

*filetype*::
    A single buffer opened in two separate windows can have different
    filetypes declared in the *window* scope with 'set' (c.f. the 'options'
    documentation page)

*status line*::
    All the buffers of the current session can have the same information
    displayed in the status line, except for a specific buffer (the
    'modelinefmt' option can be declared in the *global* scope, and
    customized in the *buffer* scope with 'set', c.f. the 'options'
    documentation page)

== Execution context

Some commands work in a specific context that might exclude one or
several scopes altogether, consequently ignoring some values of a given
object.

Example: the *window* scope is never considered when resolving the
values of options when writing a buffer (e.g. 'BOM', 'eolformat').