;;; config--pkg-vlf.el --- Generated package (no.16) from my config -*- lexical-binding: t; -*-
;;
;; Copyright (C) 2025 TEC
;;
;; Author: TEC <https://code.tecosaur.net/tec>
;; Maintainer: TEC <contact@tecosaur.net>
;; Created: April 17, 2025
;; Modified: April 17, 2025
;; Version: 2025.04.17
;; Homepage: https://code.tecosaur.net/tec/emacs-config
;; Package-Requires: ((emacs "29.1"))
;;
;; This file is not part of GNU Emacs.
;;
;;; Commentary:
;;
;;  Generated package (no.16) from my config.
;;
;;  During generation, dependency on other aspects of my configuration and
;;  packages is inferred via (regexp-based) static analysis.  While this seems
;;  to do a good job, this method is imperfect.  This code likely depends on
;;  utilities provided by Doom, and if you try to run it in isolation you may
;;  discover the code makes more assumptions.
;;
;;  That said, I've found pretty good results so far.
;;
;;  Package statement:
;;   (package! vlf :recipe (:host github :repo "emacs-straight/vlf" :files ("*.el"))
;;     :pin "d500f39672b35bf8551fdfafa892c551626c8d54")
;;
;;; Code:


(use-package! vlf-setup
  :defer-incrementally vlf-tune vlf-base vlf-write
  vlf-search vlf-occur vlf-follow vlf-ediff vlf
  :commands vlf vlf-mode
  :init
  (defvar vlf-application 'ask) ; Avoid load-order issues
  (defadvice! +files--ask-about-large-file-vlf (size op-type filename offer-raw)
  "Like `files--ask-user-about-large-file', but with support for `vlf'."
  :override #'files--ask-user-about-large-file
  (if (eq vlf-application 'dont-ask)
      (progn (vlf filename) (error ""))
    (let ((prompt (format "File %s is large (%s), really %s?"
                          (file-name-nondirectory filename)
                          (funcall byte-count-to-string-function size) op-type)))
      (if (not offer-raw)
          (if (y-or-n-p prompt) nil 'abort)
        (let ((choice
               (car
                (read-multiple-choice
                 prompt '((?y "yes")
                          (?n "no")
                          (?l "literally")
                          (?v "vlf"))
                 (files--ask-user-about-large-file-help-text
                  op-type (funcall byte-count-to-string-function size))))))
          (cond ((eq choice ?y) nil)
                ((eq choice ?l) 'raw)
                ((eq choice ?v)
                 (vlf filename)
                 (error ""))
                (t 'abort)))))))
  :config
  (advice-remove 'abort-if-file-too-large #'ad-Advice-abort-if-file-too-large)
  (defvar-local +vlf-cumulative-linenum '((0 . 0))
  "An alist keeping track of the cumulative line number.")

(defun +vlf-update-linum ()
  "Update the line number offset."
  (let ((linenum-offset (alist-get vlf-start-pos +vlf-cumulative-linenum)))
    (setq display-line-numbers-offset (or linenum-offset 0))
    (when (and linenum-offset (not (assq vlf-end-pos +vlf-cumulative-linenum)))
      (push (cons vlf-end-pos (+ linenum-offset
                                 (count-lines (point-min) (point-max))))
            +vlf-cumulative-linenum))))

(add-hook 'vlf-after-chunk-update-hook #'+vlf-update-linum)

;; Since this only works with absolute line numbers, let's make sure we use them.
(add-hook! 'vlf-mode-hook (setq-local display-line-numbers t))
  (defun +vlf-next-chunk-or-start ()
  (if (= vlf-file-size vlf-end-pos)
      (vlf-jump-to-chunk 1)
    (vlf-next-batch 1))
  (goto-char (point-min)))

(defun +vlf-last-chunk-or-end ()
  (if (= 0 vlf-start-pos)
      (vlf-end-of-file)
    (vlf-prev-batch 1))
  (goto-char (point-max)))

(defun +vlf-isearch-wrap ()
  (if isearch-forward
      (+vlf-next-chunk-or-start)
    (+vlf-last-chunk-or-end)))

(add-hook! 'vlf-mode-hook (setq-local isearch-wrap-function #'+vlf-isearch-wrap)))

(provide 'config--pkg-vlf)
;;; config--pkg-vlf.el ends here