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User option to choose a function triggered by windmove-create (bug#48917)

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* lisp/windmove.el (windmove-create-window): Add a defcustom choice.
(windmove-do-window-select): Trigger custom functions, update the docstring.
This commit is contained in:
pillule 2021-06-16 02:31:58 +03:00 committed by Juri Linkov
parent 0367d17482
commit db106ea88b
1 changed files with 18 additions and 5 deletions
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23
lisp/windmove.el
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@ -144,9 +144,18 @@ is inactive."
"Whether movement off the edge of the frame creates a new window.
If this variable is set to t, moving left from the leftmost window in
a frame will create a new window on the left, and similarly for the other
directions."
:type 'boolean
:version "27.1")
directions.
This variable may also be a function to be called in this circumstance
by `windmove-do-window-select'. The function should accept then as
argument the DIRECTION targeted, an interactive ARG and a WINDOW
corresponding to the currently selected window. It should also return
a valid window that `windmove-do-window-select' will select,
or the symbol `no-select' to ignore that final selection."
:type '(choice
(const :tag "Don't create new windows" nil)
(const :tag "Create new windows" t)
(function :tag "Provide a function"))
:version "28.1")
;; If your Emacs sometimes places an empty column between two adjacent
;; windows, you may wish to set this delta to 2.
@ -356,19 +365,23 @@ use the left or top edge of WINDOW as reference point."
"Move to the window at direction DIR as seen from WINDOW.
DIR, ARG, and WINDOW are handled as by `windmove-find-other-window'.
If no window is at direction DIR, an error is signaled.
If `windmove-create-window' is non-nil, try to create a new window
If `windmove-create-window' is a function, call that function with
DIR, ARG and WINDOW. If it is non-nil, try to create a new window
in direction DIR instead."
(let ((other-window (windmove-find-other-window dir arg window)))
(when (and windmove-create-window
(or (null other-window)
(and (window-minibuffer-p other-window)
(not (minibuffer-window-active-p other-window)))))
(setq other-window (split-window window nil dir)))
(setq other-window (if (functionp windmove-create-window)
(funcall windmove-create-window dir arg window)
(split-window window nil dir))))
(cond ((null other-window)
(user-error "No window %s from selected window" dir))
((and (window-minibuffer-p other-window)
(not (minibuffer-window-active-p other-window)))
(user-error "Minibuffer is inactive"))
((eq other-window 'no-select))
(t
(select-window other-window)))))