display-buffer-alist

display-buffer-alist is a variable defined in `window.el'.
Its value is

nil

• This variable may be risky if used as a file-local variable.

Documentation:
Alist of conditional actions for `display-buffer'.
This is a list of elements (CONDITION . ACTION), where:

CONDITION is either a regexp matching buffer names, or a
function that takes two arguments - a buffer name and the
ACTION argument of `display-buffer' - and returns a boolean.

ACTION is a cons cell (FUNCTION . ALIST), where FUNCTION is a
function or a list of functions. Each such function should
accept two arguments: a buffer to display and an alist of the
same form as ALIST. See `display-buffer' for details.

`display-buffer' scans this alist until it either finds a
matching regular expression or the function specified by a
condition returns non-nil. In any of these cases, it adds the
associated action to the list of actions it will try.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.