lisp/quality-of-life.el


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;;; quality-of-life.el -*- lexical-binding: t; -*-
;;;
;;; Author:  Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;; URL:     https://git.sr.ht/~jakob/.emacs.d/
;;;
;;; Configuration for packages which I consider to be functional improvements to
;;; the quality of my daily Emacs usage.
;;;


;;;
;;; Ivy
;;;

;; As suggested by a friend [1], I tried out `ivy' as a replacement for `ido.'
;; It was love at first sight. It's snappy, and works even better than `ido'
;; after setting `exwm-workspace-show-all-buffers' and
;; `exwm-layout-show-all-buffers'.
;;
;; [1]: https://icosahedron.website/@zge/101330910258980695

(use-package ivy
  ;; Configure how the =completing-read= is displayed.
  :init
  (setq ivy-height 5 ivy-count-format "")

  ;; Enable Ivy globally.
  :config
  (ivy-mode 1)

  ;; If I'm typing a file name with capitalized letters, I may be holding shift
  ;; when I press space. This is a pain in the ass, and I don't use the feature
  ;; anyway, so I unbind it.
  (bind-key "S-SPC" nil ivy-minibuffer-map)

  :config/el-patch
  (defun ivy-magic-read-file-env ()
    "If reading filename, jump to environment variable location."
    (interactive)
    (if (and ivy--directory
             (equal ivy-text ""))
        (let* ((cands (cl-loop for pair in process-environment
                         for (var val) = (split-string pair "=" t)
                         if (and val (not (equal "" val)))
                         if (or
                             ;; Don't `file-exists-p' on TRAMP stuff
                             (el-patch-add (string-suffix-p ":/" val))
                             (file-exists-p
                              (if (file-name-absolute-p val)
                                  val
                                (setq val
                                      (expand-file-name val ivy--directory)))))
                         collect (cons var val)))
               (enable-recursive-minibuffers t)
               (x (ivy-read "Env: " cands))
               (path (cdr (assoc x cands))))
          (insert (if (file-accessible-directory-p path)
                      (file-name-as-directory path)
                    path))
          (ivy--cd-maybe))
      (insert last-input-event))))

;; `counsel' is a nice Ivy-based frontend for a couple of interactive commands.

(use-package counsel
  :demand t
  :bind
  ("C-x b" . counsel-switch-buffer))

;; Use Swiper instead of isearch.

(use-package swiper
  :bind
  ("C-r" . swiper)
  ("C-s" . swiper))

;; Use a better sorting algorithm.

(use-package ivy-prescient
  :config
  (ivy-prescient-mode)
  (prescient-persist-mode)
  :init
  (setq prescient-save-file "~/.cache/prescient-save.el"))


;;;
;;; Imenu
;;;

(use-package imenu
  :bind ("C-c s" . imenu))


;;;
;;; Yasnippet
;;;

;; Load all snippets when `yas-minor-mode' is enabled.

(use-package yasnippet
  :demand t
  :hook
  (yas-minor-mode . yas-reload-all))


;;;
;;; Avy
;;;

;; Set up keybindings for Avy.

(use-package avy
  :bind
  ("M-s" . avy-goto-char-timer)
  :init
  (setq avy-timeout-seconds 0.2))

;; Install a link-selection package for Avy, and create a binding for `org-mode'.

;; TODO: Should I re-enable this?

;; (use-package ace-link
;;   :after org
;;   :init (ace-link-setup-default)
;;   :bind (:map org-mode-map
;;          ("C-c C-o" . ace-link-org)))


;; Hack so that fill-paragraph is aware of the width of in-line LaTeX previews.

(defvar standard-fill-column
  (symbol-function #'current-fill-column))

(defun extract-rest-of-paragraph ()
  "Return, as a string, the region from POINT to the end of the
paragraph."
  (save-excursion
    (let ((beg (point)))
      (forward-paragraph)
      (buffer-substring beg (point)))))

(defun tex-aware-current-fill-column ()
  "Fill without breaking over LaTeX previews."
  (interactive "d")
  ;; This only really applies in `org-mode', so hop out if that's not the case.
  (if (eq 'org-mode major-mode)
      ;; Extract paragraph to temporary buffer.
      (let ((rest (extract-rest-of-paragraph))
            res)
        (with-temp-buffer
          (insert rest)
          (goto-char (point-min))

          ;; "Flatten" out the region.
          (org-latex-preview)

          (cl-flet ((end-position () (save-excursion (end-of-paragraph-text) (point))))
            (let ((char-width-read 0)
                  last-position)
              (while (/= (point) (end-position))
                (setq last-position (point))
                (forward-sexp)
                (setq char-width-read
                      (+ char-width-read
                         (- (point) last-position)
                         (cl-reduce #'+
                                    (mapcar #'(lambda (ol)
                                                (car (image-size (overlay-get ol 'display))))
                                            (overlays-in last-position (point))))))
                (when (and (>= char-width-read fill-column)
                           (not res))
                  (setq res char-width-read)))))

          (round (or res fill-column))))
    (funcall standard-fill-column)))

(fset 'current-fill-column #'tex-aware-current-fill-column)
(fset 'current-fill-column standard-fill-column)