.emacs.d/init/basics/ui.el

;;; ui.el --- Configure user interfaces. -*- lexical-binding: t; -*-

;; Time-stamp: <2019-10-14T14:44:16+00:00>

;;; Commentary:

;;; Code:

;; Show directory tree in a window.
(use-package neotree
  :pin melpa                        ; <= 0.5.2 changes directory on file switch.
  :demand t
  :after (all-the-icons)

  :custom
  (neo-smart-open t)
  (neo-show-updir-line t)           ; Disabled by doom-themes?
  (neo-window-width 40)
  (neo-show-hidden-files t)
  (neo-theme 'icons)

  :bind
  ("<f8>" . neotree-show)
  ("C-<f8>" . neotree-hide)
  )

;; Completion in many Emacs commands.
(use-package ivy
  :custom
  (ivy-use-virtual-buffers t)
  (ivy-count-format "[%d/%d] ")
  (ivy-wrap t)

  :config
  (ivy-mode 1)

  :bind
  ("C-c C-r" . ivy-resume)
  (:map ivy-minibuffer-map
        ("M-<up>" . ivy-previous-history-element)
        ("M-<down>" . ivy-next-history-element)
        )
  )

;; Extensions for ivy
(use-package counsel
  :bind
  ("C-x C-f" . counsel-find-file)
  ("M-x" . counsel-M-x)
  )

;; Use icons in ivy.
(use-package all-the-icons-ivy
  :after (all-the-icons counsel)

  :config
  (all-the-icons-ivy-setup)
  )

;; More information in ivy mini-buffers.
(use-package ivy-rich
  ;; all-the-icons-ivy would override the ivy-rich switch-buffer improvements.
  :after (all-the-icons-ivy counsel)
  :functions (ivy-format-function-line)

  :config
  (defun ivy-rich-switch-buffer-icon (candidate)
    (with-current-buffer
        (get-buffer candidate)
      (let ((icon (all-the-icons-icon-for-mode major-mode)))
        (if (symbolp icon)
            (all-the-icons-icon-for-mode 'fundamental-mode)
          icon))))

  (ivy-rich-mode 1)
  (setcdr (assq t ivy-format-functions-alist) #'ivy-format-function-line)

  :custom
  ;; It seems I have to copy this whole list to get icons in switch-buffer.
  (ivy-rich-display-transformers-list
   (quote
    (ivy-switch-buffer
     (:columns
      ((ivy-rich-switch-buffer-icon :width 2)
       (ivy-rich-candidate
        (:width 30))
       (ivy-rich-switch-buffer-size
        (:width 7))
       (ivy-rich-switch-buffer-indicators
        (:width 4 :face error :align right))
       (ivy-rich-switch-buffer-major-mode
        (:width 12 :face warning))
       (ivy-rich-switch-buffer-project
        (:width 15 :face success))
       (ivy-rich-switch-buffer-path
        (:width
         (lambda
           (x)
           (ivy-rich-switch-buffer-shorten-path
            x (ivy-rich-minibuffer-width 0.3))))))
      :predicate
      (lambda
        (cand)
        (get-buffer cand)))
     counsel-M-x
     (:columns
      ((counsel-M-x-transformer
        (:width 40))
       (ivy-rich-counsel-function-docstring
        (:face font-lock-doc-face))))
     counsel-describe-function
     (:columns
      ((counsel-describe-function-transformer
        (:width 40))
       (ivy-rich-counsel-function-docstring
        (:face font-lock-doc-face))))
     counsel-describe-variable
     (:columns
      ((counsel-describe-variable-transformer
        (:width 40))
       (ivy-rich-counsel-variable-docstring
        (:face font-lock-doc-face))))
     counsel-recentf
     (:columns
      ((ivy-rich-candidate
        (:width 0.8))
       (ivy-rich-file-last-modified-time
        (:face font-lock-comment-face)))))))
  )

;; Better search.
(use-package swiper
  :after ivy
  :functions (swiper)

  :bind
  ("C-s" . 'swiper)
  )

(provide 'basics/ui)
;;; ui.el ends here