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;;; vertico-grid.el --- Grid display for Vertico -*- lexical-binding: t -*-
;; Copyright (C) 2021-2026 Free Software Foundation, Inc.
;; Author: Daniel Mendler <mail@daniel-mendler.de>
;; Maintainer: Daniel Mendler <mail@daniel-mendler.de>
;; Created: 2021
;; This file is part of GNU Emacs.
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This package is a Vertico extension providing a grid display.
;;
;; The mode `vertico-grid-mode' can be enabled globally or via
;; `vertico-multiform-mode' per command or completion category.
;; Alternatively the grid display can be toggled temporarily with
;; M-G if `vertico-multiform-mode' is enabled.
;;; Code:
(require 'vertico)
(eval-when-compile
(require 'cl-lib)
(require 'subr-x))
(defcustom vertico-grid-min-columns 2
"Minimal number of grid columns."
:type 'natnum
:group 'vertico)
(defcustom vertico-grid-max-columns 8
"Maximal number of grid columns."
:type 'natnum
:group 'vertico)
(defcustom vertico-grid-annotate 0
"Reserved characters for the annotations."
:type 'natnum
:group 'vertico)
(defcustom vertico-grid-separator
#(" | " 3 4 (display (space :width (1)) face (:inherit shadow :inverse-video t)))
"Separator between columns."
:type 'string
:group 'vertico)
(defcustom vertico-grid-lookahead 100
"Number of candidates to lookahead for column number computation.
When scrolling beyond this limit, candidates may be truncated."
:type 'natnum
:group 'vertico)
(defvar-keymap vertico-grid-map
:doc "Additional keymap activated in grid mode."
"<remap> <left-char>" #'vertico-grid-left
"<remap> <right-char>" #'vertico-grid-right
"<remap> <scroll-down-command>" #'vertico-grid-scroll-down
"<remap> <scroll-up-command>" #'vertico-grid-scroll-up)
(defvar-local vertico-grid--columns vertico-grid-min-columns
"Current number of grid columns.")
(defun vertico-grid-left (&optional n)
"Move N columns to the left in the grid."
(interactive "p")
(vertico-grid-right (- (or n 1))))
(defun vertico-grid-right (&optional n)
"Move N columns to the right in the grid."
(interactive "p")
(let* ((page (* vertico-count vertico-grid--columns))
(x1 (/ (% vertico--index page) vertico-count))
(cols (min (1- vertico-grid--columns)
(+ x1 (/ (- vertico--total vertico--index 1) vertico-count))))
(x2 (if vertico-cycle
(mod (+ x1 (or n 1)) (1+ cols))
(min cols (max 0 (+ x1 (or n 1)))))))
(vertico--goto (+ vertico--index (* vertico-count (- x2 x1))))))
(defun vertico-grid-scroll-down (&optional n)
"Go back by N pages."
(interactive "p")
(vertico--goto (max 0 (- vertico--index (* (or n 1) vertico-grid--columns vertico-count)))))
(defun vertico-grid-scroll-up (&optional n)
"Go forward by N pages."
(interactive "p")
(vertico-grid-scroll-down (- (or n 1))))
;;;###autoload
(define-minor-mode vertico-grid-mode
"Grid display for Vertico."
:global t :group 'vertico
;; Shrink current minibuffer window
(when-let* ((win (active-minibuffer-window)))
(unless (frame-root-window-p win)
(window-resize win (- (window-pixel-height win)) nil nil 'pixelwise)))
(cl-callf2 rassq-delete-all vertico-grid-map minor-mode-map-alist)
(when vertico-grid-mode
(push `(vertico--input . ,vertico-grid-map) minor-mode-map-alist)))
(cl-defmethod vertico--arrange-candidates (&context (vertico-grid-mode (eql t)))
(when (<= vertico--index 0)
(let ((w 1))
(cl-loop repeat vertico-grid-lookahead for cand in vertico--candidates do
(setq w (max w (+ vertico-grid-annotate (length cand)))))
(setq vertico-grid--columns
(max vertico-grid-min-columns
(min vertico-grid-max-columns
(floor (vertico--window-width) (+ w (length vertico-grid-separator))))))))
(let* ((sep (length vertico-grid-separator))
(count (* vertico-count vertico-grid--columns))
(start (* count (floor (max 0 vertico--index) count)))
(width (- (/ (vertico--window-width) vertico-grid--columns) sep))
(cands (funcall (if (> vertico-grid-annotate 0) #'vertico--affixate #'identity)
(cl-loop repeat count for c in (nthcdr start vertico--candidates)
collect (vertico--hilit c))))
(cands (cl-loop
for cand in cands for index from 0 collect
(let (prefix suffix)
(when (consp cand)
(setq prefix (cadr cand) suffix (caddr cand) cand (car cand)))
(when (string-search "\n" cand)
(setq cand (vertico--truncate-multiline cand width)))
(truncate-string-to-width
(string-trim
(replace-regexp-in-string
"[ \t]+"
(lambda (x) (apply #'propertize " " (text-properties-at 0 x)))
(vertico--format-candidate cand prefix suffix (+ index start) start)))
width))))
(width (make-vector vertico-grid--columns 0)))
(dotimes (col vertico-grid--columns)
(dotimes (row vertico-count)
(aset width col (max
(aref width col)
(string-width (or (nth (+ row (* col vertico-count)) cands) ""))))))
(dotimes (col (1- vertico-grid--columns))
(incf (aref width (1+ col)) (+ (aref width col) sep)))
(cl-loop for row from 0 to (1- (min vertico-count vertico--total)) collect
(let ((line (list "\n")))
(cl-loop for col from (1- vertico-grid--columns) downto 0 do
(when-let* ((cand (nth (+ row (* col vertico-count)) cands)))
(push cand line)
(when (> col 0)
(push vertico-grid-separator line)
(push (propertize " " 'display
`(space :align-to (+ left ,(aref width (1- col))))) line))))
(string-join line)))))
;; Do not show Vertico commands in M-X
(dolist (sym '( vertico-grid-left vertico-grid-right
vertico-grid-scroll-up vertico-grid-scroll-down))
(put sym 'completion-predicate #'vertico--command-p))
(provide 'vertico-grid)
;;; vertico-grid.el ends here