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;;; vertico-flat.el --- Flat, horizontal display for Vertico -*- lexical-binding: t -*-
;; Copyright (C) 2021-2025 Free Software Foundation, Inc.
;; Author: Daniel Mendler <mail@daniel-mendler.de>
;; Maintainer: Daniel Mendler <mail@daniel-mendler.de>
;; Created: 2021
;; Version: 2.1
;; Package-Requires: ((emacs "28.1") (compat "30") (vertico "2.1"))
;; URL: https://github.com/minad/vertico
;; 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 horizontal display.
;;
;; The mode `vertico-flat-mode' can be enabled globally or via
;; `vertico-multiform-mode' per command or completion category.
;; Alternatively the flat display can be toggled temporarily with
;; M-F if `vertico-multiform-mode' is enabled.
;;
;; The flat display can be made to look like `ido-mode' by setting
;; `vertico-cycle' to t. See also the `vertico-flat-format'
;; configuration variable for further tweaks.
;;; Code:
(require 'vertico)
(eval-when-compile (require 'cl-lib))
(defcustom vertico-flat-max-lines 1
"Maximal number of lines to use."
:type 'natnum
:group 'vertico)
(defcustom vertico-flat-format
'(:multiple #("{%s}" 0 1 (face minibuffer-prompt)
3 4 (face minibuffer-prompt))
:single #("[%s]" 0 1 (face minibuffer-prompt)
1 3 (face success) 3 4 (face minibuffer-prompt))
:prompt #("(%s)" 0 1 (face minibuffer-prompt)
3 4 (face minibuffer-prompt))
:separator #(" | " 0 3 (face minibuffer-prompt))
:ellipsis #("…" 0 1 (face minibuffer-prompt))
:no-match "[No match]"
:spacer #(" " 0 1 (cursor t)))
"Formatting strings."
:type 'plist
:group 'vertico)
(defcustom vertico-flat-annotate nil
"Annotate candidates."
:type 'boolean
:group 'vertico)
(defvar-keymap vertico-flat-map
:doc "Additional keymap activated in flat mode."
"<remap> <left-char>" #'vertico-previous
"<remap> <right-char>" #'vertico-next)
;;;###autoload
(define-minor-mode vertico-flat-mode
"Flat, horizontal 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-flat-map minor-mode-map-alist)
(when vertico-flat-mode
(push `(vertico--input . ,vertico-flat-map) minor-mode-map-alist)))
(cl-defmethod vertico--resize (&context (vertico-flat-mode (eql t)))
(setq-local truncate-lines nil
resize-mini-windows t))
(cl-defmethod vertico--display-candidates (candidates &context (vertico-flat-mode (eql t)))
(move-overlay vertico--candidates-ov (point-max) (point-max))
(overlay-put
vertico--candidates-ov 'after-string
(concat (plist-get vertico-flat-format :spacer)
(cond
((and (not candidates) (plist-get vertico-flat-format :no-match)))
((and (= vertico--total 1) (= vertico--index 0)
(when-let ((fmt (plist-get vertico-flat-format :single)))
(format fmt (substring-no-properties (car candidates))))))
(t (format (plist-get vertico-flat-format (if (< vertico--index 0) :prompt :multiple))
(string-join candidates (plist-get vertico-flat-format :separator))))))))
(cl-defmethod vertico--arrange-candidates (&context (vertico-flat-mode (eql t)))
(let* ((index (max 0 vertico--index)) (count vertico-count)
(candidates (nthcdr vertico--index vertico--candidates))
(width (- (* vertico-flat-max-lines (- (vertico--window-width) 4))
(length (plist-get vertico-flat-format :left))
(length (plist-get vertico-flat-format :separator))
(length (plist-get vertico-flat-format :right))
(length (plist-get vertico-flat-format :ellipsis))
(car (posn-col-row (posn-at-point (1- (point-max)))))))
(result) (wrapped))
(while (and candidates (not (eq wrapped (car candidates)))
(> width 0) (> count 0))
(let ((cand (pop candidates)) (prefix "") (suffix ""))
(setq cand (vertico--hilit cand))
(pcase (and vertico-flat-annotate (vertico--affixate (list cand)))
(`((,c ,p ,s)) (setq cand c prefix p suffix s)))
(when (string-search "\n" cand)
(setq cand (vertico--truncate-multiline cand width)))
(setq cand (string-trim
(replace-regexp-in-string
"[ \t]+"
(lambda (x) (apply #'propertize " " (text-properties-at 0 x)))
(vertico--format-candidate cand prefix suffix index vertico--index)))
index (1+ index)
count (1- count)
width (- width (string-width cand) (length (plist-get vertico-flat-format :separator))))
(when (or (not result) (> width 0))
(push cand result))
(when (and vertico-cycle (not candidates))
(setq candidates vertico--candidates index 0
wrapped (nth vertico--index vertico--candidates)))))
(when (if wrapped
(> vertico--total (- vertico-count count))
(and (/= vertico--total 0) (/= index vertico--total)))
(push (plist-get vertico-flat-format :ellipsis) result))
(nreverse result)))
(provide 'vertico-flat)
;;; vertico-flat.el ends here
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