;;; appearance.el --- Configure appearance. -*- lexical-binding: t; -*-

;; Time-stamp: <2020-11-29T10:54:00+0100>

;;; Commentary:

;; * Helpful visualizations.
;; * Colors and theme.
;; * Icon font.
;; * Modeline stuff.

;;; Code:

(require 'basics/package-management)
(require 'basics/global-variables)

(use-package emacs
  :straight (:type built-in)
  :demand t
  ;; If 2 files have the same name, append directory name after the filename.
  :custom ((uniquify-after-kill-buffer-p t)
           (uniquify-buffer-name-style 'post-forward)
           (uniquify-strip-common-suffix t))
  :config (progn
            (defun my/set-default-fonts ()
              "Set the default font and the emoji font."
              (when (member "Source Code Pro" (font-family-list))  ; Default.
                (set-frame-font "Source Code Pro-10" t t))
              (when (member "Noto Color Emoji" (font-family-list)) ; Emojis.
                (set-fontset-font t 'unicode "Noto Color Emoji" nil 'prepend)))

            (tool-bar-mode -1)              ; Hide toolbar.
            (menu-bar-mode -1)              ; Hide menu bar.
            (when (fboundp #'set-scroll-bar-mode)
              (set-scroll-bar-mode 'right))
            (add-to-list 'default-frame-alist '(scroll-bar-width  . 8))
            (my/set-default-fonts)
            (show-paren-mode t)             ; Visualize matching parens.
            (setq frame-title-format        ; Show filename in frame title.
                  '(multiple-frames
                    "%b" ("" invocation-name "@" system-name
                          " – " buffer-file-truename)))))

;; Highlight current line.
(use-package hl-line
  :straight (:type built-in)
  :demand t
  :config (global-hl-line-mode t))

;; Icon font (required by doom and others).
(use-package all-the-icons
  :demand t
  :init (defun my/font-installed-p (font-name)
          "Check if font with FONT-NAME is available."
          (if (find-font (font-spec :name font-name))
              t
            nil))
  ;; Install fonts if we have a GUI and the font is not already installed.
  ;; See <https://github.com/domtronn/all-the-icons.el/issues/58>.
  :config (when (and (display-graphic-p)
                     (not (my/font-installed-p "all-the-icons")))
            (all-the-icons-install-fonts t)))

(unless slow-computer
  (use-package doom-themes
    :demand t
    :after (all-the-icons)
    :custom ((doom-themes-treemacs-theme "doom-colors")
             (doom-themes-treemacs-enable-variable-pitch nil))
    :config (progn
              (defun my/reload-theme ()
                (load-theme 'doom-outrun-electric t)
                (when (display-graphic-p)
                  (set-face-background 'scroll-bar (face-background 'default))
                  (set-face-foreground 'scroll-bar (face-foreground 'shadow)))
                (when (fboundp #'my/ruler-set-colors)
                  (my/ruler-set-colors))
                (when (fboundp #'my/volatile-highlights-reset-color)
                  (my/volatile-highlights-reset-color)))
              (my/reload-theme)

              (doom-themes-visual-bell-config) ; Flash modeline on error.
              ;; No icons in TUI, see
              ;; <https://github.com/hlissner/emacs-doom-themes/issues/489>
              (doom-themes-treemacs-config)

              ;; Write a minimal theme to file, to load it in early-init.el.
              (unless (string= (face-background 'default) "unspecified-bg")
                (let ((minimal-theme))
                  (setq minimal-theme (concat "(set-face-background 'default \""
                                              (face-background 'default) "\")\n"
                                              "(set-face-foreground 'default \""
                                              (face-foreground 'default) "\")\n"
                                              "(menu-bar-mode -1)\n"
                                              "(when (display-graphic-p)\n"
                                              "  (tool-bar-mode -1))\n"))
                  (with-temp-file (expand-file-name "early-theme.el"
                                                    user-emacs-directory)
                    (insert minimal-theme))))

              (defun my/treemacs-reset-fringe ()
                "Make fringe in treemacs visible again."
                (set-window-fringes (selected-window) 8))
              (advice-add #'doom-themes-hide-fringes-maybe
                          :after #'my/treemacs-reset-fringe))
    :hook (server-after-make-frame . my/reload-theme))
  ) ; unless slow-computer.

;; Neat modeline.
(use-package doom-modeline
  :after (all-the-icons hl-line)
  :init (column-number-mode t)           ; Show column number.
  :custom ((doom-modeline-minor-modes t) ; Show minor modes.
           (doom-modeline-buffer-file-name-style 'truncate-all)
           (mode-line-percent-position nil)       ; Don't display percentage.
           (doom-modeline-buffer-state-icon nil)) ; Don't display save icon.
  :hook (after-init . doom-modeline-mode))

;; Show line numbers on the left side of the buffer.
(use-package display-line-numbers
  :straight (:type built-in)
  :demand t
  :if (>= emacs-major-version 26)
  :config (progn (defun my/disable-line-numbers ()
                   (display-line-numbers-mode -1))
                 (global-display-line-numbers-mode)))

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