#+TITLE: DT's GNU Emacs Config
#+AUTHOR: Derek Taylor (DT)
#+DESCRIPTION: DT's personal Emacs config.
#+STARTUP: showeverything
#+OPTIONS: toc:2

* TABLE OF CONTENTS :toc:
- [[#important-programs-to-load-first][IMPORTANT PROGRAMS TO LOAD FIRST]]
  - [[#adding-the-scripts-directory-to-path][Adding the scripts directory to path]]
  - [[#sourcing-the-scripts][Sourcing the scripts]]
- [[#all-the-icons][ALL THE ICONS]]
- [[#backup-files][BACKUP FILES]]
- [[#company][COMPANY]]
- [[#dashboard][DASHBOARD]]
- [[#diminish][DIMINISH]]
- [[#dired][DIRED]]
- [[#evil][EVIL]]
- [[#flycheck][FLYCHECK]]
- [[#fonts][FONTS]]
  - [[#setting-the-font-face][Setting the Font Face]]
  - [[#zooming-inout][Zooming In/Out]]
- [[#general-keybindings][GENERAL KEYBINDINGS]]
- [[#graphical-user-interface-tweaks][GRAPHICAL USER INTERFACE TWEAKS]]
  - [[#disable-menubar-toolbars-and-scrollbars][Disable Menubar, Toolbars and Scrollbars]]
  - [[#display-line-numbers-and-truncated-lines][Display Line Numbers and Truncated Lines]]
- [[#ivy-counsel][IVY (COUNSEL)]]
- [[#language-support][LANGUAGE SUPPORT]]
- [[#modeline][MODELINE]]
- [[#neotree][NEOTREE]]
- [[#org-mode][ORG MODE]]
  - [[#enabling-table-of-contents][Enabling Table of Contents]]
  - [[#enabling-org-bullets][Enabling Org Bullets]]
  - [[#disable-electric-indent][Disable Electric Indent]]
  - [[#diminish-org-indent-mode][Diminish Org Indent Mode]]
  - [[#org-level-headers][Org Level Headers]]
  - [[#source-code-block-tag-expansion][Source Code Block Tag Expansion]]
- [[#projectile][PROJECTILE]]
- [[#rainbow-mode][RAINBOW MODE]]
- [[#shells-and-terminals][SHELLS AND TERMINALS]]
  - [[#eshell][Eshell]]
  - [[#vterm][Vterm]]
  - [[#vterm-toggle][Vterm-Toggle]]
- [[#sudo-edit][SUDO EDIT]]
- [[#theme][THEME]]
- [[#transparency][TRANSPARENCY]]
- [[#which-key][WHICH-KEY]]

* IMPORTANT PROGRAMS TO LOAD FIRST
To keep this =config.org= a reasonable length, I have moved a lot of code to individual scripts that will be sourced by this config.  These scripts are found in "~/.config/emacs/scripts" and do not contain any code that most people are likely to need to edit.

** Adding the scripts directory to path
#+begin_src emacs-lisp
(add-to-list 'load-path "~/.config/emacs/scripts/")
#+end_src

** Sourcing the scripts
#+begin_src emacs-lisp
(require 'elpaca-setup)  ;; The Elpaca Package Manager
(require 'buffer-move)   ;; Buffer-move for better window management
(require 'app-launchers) ;; Use emacs as a run launcher like dmenu (experimental)
#+end_src

* ALL THE ICONS
This is an icon set that can be used with dashboard, dired, ibuffer and other Emacs programs.
  
#+begin_src emacs-lisp
(use-package all-the-icons
  :ensure t
  :if (display-graphic-p))

(use-package all-the-icons-dired
  :hook (dired-mode . (lambda () (all-the-icons-dired-mode t))))
#+end_src

* BACKUP FILES
By default, Emacs creates automatic backups of files in their original directories, such "file.el" and the backup "file.el~".  This leads to a lot of clutter, so let's tell Emacs to put all backups that it creates in the =TRASH= directory.

#+begin_src emacs-lisp
(setq backup-directory-alist '((".*" . "~/.Trash")))

#+end_src

* COMPANY
[[https://company-mode.github.io/][Company]] is a text completion framework for Emacs. The name stands for "complete anything".  Completion will start automatically after you type a few letters. Use M-n and M-p to select, <return> to complete or <tab> to complete the common part.

#+begin_src emacs-lisp
(use-package company
  :defer 2
  :diminish
  :custom
  (company-begin-commands '(self-insert-command))
  (company-idle-delay .1)
  (company-minimum-prefix-length 2)
  (company-show-numbers t)
  (company-tooltip-align-annotations 't)
  (global-company-mode t))

(use-package company-box
  :after company
  :diminish
  :hook (company-mode . company-box-mode))
#+end_src

* DASHBOARD
Emacs Dashboard is an extensible startup screen showing you recent files, bookmarks, agenda items and an Emacs banner.

#+begin_src emacs-lisp
(use-package dashboard
  :ensure t 
  :init
  (setq initial-buffer-choice 'dashboard-open)
  (setq dashboard-set-heading-icons t)
  (setq dashboard-set-file-icons t)
  (setq dashboard-banner-logo-title "Emacs Is More Than A Text Editor!")
  ;;(setq dashboard-startup-banner 'logo) ;; use standard emacs logo as banner
  (setq dashboard-startup-banner "/home/dt/.config/emacs/images/dtmacs-logo.png")  ;; use custom image as banner
  (setq dashboard-center-content nil) ;; set to 't' for centered content
  (setq dashboard-items '((recents . 5)
                          (agenda . 5 )
                          (bookmarks . 3)
                          (projects . 3)
                          (registers . 3)))
  :custom 
  (dashboard-modify-heading-icons '((recents . "file-text")
				      (bookmarks . "book")))
  :config
  (dashboard-setup-startup-hook))

#+end_src

* DIMINISH
This package implements hiding or abbreviation of the modeline displays (lighters) of minor-modes.  With this package installed, you can add ':diminish' to any use-package block to hide that particular mode in the modeline.

#+begin_src emacs-lisp
(use-package diminish)

#+end_src

* DIRED
#+begin_src emacs-lisp
(use-package dired-open
  :config
  (setq dired-open-extensions '(("gif" . "sxiv")
                                ("jpg" . "sxiv")
                                ("png" . "sxiv")
                                ("mkv" . "mpv")
                                ("mp4" . "mpv"))))

(use-package peep-dired
  :after dired
  :hook (evil-normalize-keymaps . peep-dired-hook)
  :config
    (evil-define-key 'normal dired-mode-map (kbd "h") 'dired-up-directory)
    (evil-define-key 'normal dired-mode-map (kbd "l") 'dired-open-file) ; use dired-find-file instead if not using dired-open package
    (evil-define-key 'normal peep-dired-mode-map (kbd "j") 'peep-dired-next-file)
    (evil-define-key 'normal peep-dired-mode-map (kbd "k") 'peep-dired-prev-file)
)

#+end_src

* EVIL
[[https://github.com/emacs-evil/evil][Evil]] is an extensible vi/vim layer for Emacs.  Because...let's face it.  The Vim keybindings are just plain better.

#+begin_src emacs-lisp
;; Expands to: (elpaca evil (use-package evil :demand t))
(use-package evil
    :init      ;; tweak evil's configuration before loading it
    (setq evil-want-integration t) ;; This is optional since it's already set to t by default.
    (setq evil-want-keybinding nil)
    (setq evil-vsplit-window-right t)
    (setq evil-split-window-below t)
    (evil-mode))
  (use-package evil-collection
    :after evil
    :config
    (setq evil-collection-mode-list '(dashboard dired ibuffer))
    (evil-collection-init))
  (use-package evil-tutor)
#+end_src

* FLYCHECK
Install =luacheck= from your Linux distro's repositories for flycheck to work correctly with lua files.  Install =python-pylint= for flycheck to work with python files.  Haskell works with flycheck as long as =haskell-ghc= or =haskell-stack-ghc= is installed.  For more information on language support for flycheck, [[https://www.flycheck.org/en/latest/languages.html][read this]].

#+begin_src emacs-lisp
(use-package flycheck
  :ensure t
  :defer t
  :diminish
  :init (global-flycheck-mode))

#+end_src

* FONTS
Defining the various fonts that Emacs will use.

** Setting the Font Face
#+begin_src emacs-lisp
(set-face-attribute 'default nil
  :font "JetBrains Mono"
  :height 110
  :weight 'medium)
(set-face-attribute 'variable-pitch nil
  :font "Ubuntu"
  :height 120
  :weight 'medium)
(set-face-attribute 'fixed-pitch nil
  :font "JetBrains Mono"
  :height 110
  :weight 'medium)
;; Makes commented text and keywords italics.
;; This is working in emacsclient but not emacs.
;; Your font must have an italic face available.
(set-face-attribute 'font-lock-comment-face nil
  :slant 'italic)
(set-face-attribute 'font-lock-keyword-face nil
  :slant 'italic)

;; This sets the default font on all graphical frames created after restarting Emacs.
;; Does the same thing as 'set-face-attribute default' above, but emacsclient fonts
;; are not right unless I also add this method of setting the default font.
(add-to-list 'default-frame-alist '(font . "JetBrains Mono-11"))

;; Uncomment the following line if line spacing needs adjusting.
(setq-default line-spacing 0.12)

#+end_src

** Zooming In/Out
You can use the bindings CTRL plus =/- for zooming in/out.  You can also use CTRL plus the mouse wheel for zooming in/out.

#+begin_src emacs-lisp
(global-set-key (kbd "C-=") 'text-scale-increase)
(global-set-key (kbd "C--") 'text-scale-decrease)
(global-set-key (kbd "<C-wheel-up>") 'text-scale-increase)
(global-set-key (kbd "<C-wheel-down>") 'text-scale-decrease)
#+end_src

* GENERAL KEYBINDINGS
#+begin_src emacs-lisp
(use-package general
  :config
  (general-evil-setup)
  
  ;; set up 'SPC' as the global leader key
  (general-create-definer dt/leader-keys
    :states '(normal insert visual emacs)
    :keymaps 'override
    :prefix "SPC" ;; set leader
    :global-prefix "M-SPC") ;; access leader in insert mode

  (dt/leader-keys
    "SPC" '(counsel-M-x :wk "Counsel M-x")
    "." '(find-file :wk "Find file")
    "f c" '((lambda () (interactive) (find-file "~/.config/emacs/config.org")) :wk "Edit emacs config")
    "f r" '(counsel-recentf :wk "Find recent files")
    "TAB TAB" '(comment-line :wk "Comment lines"))

  (dt/leader-keys
    "b" '(:ignore t :wk "Buffer")
    "b b" '(switch-to-buffer :wk "Switch buffer")
    "b i" '(ibuffer :wk "Ibuffer")
    "b k" '(kill-this-buffer :wk "Kill this buffer")
    "b n" '(next-buffer :wk "Next buffer")
    "b p" '(previous-buffer :wk "Previous buffer")
    "b r" '(revert-buffer :wk "Reload buffer"))

  (dt/leader-keys
    "d" '(:ignore t :wk "Dired")
    "d d" '(dired :wk "Open dired")
    "d j" '(dired-jump :wk "Dired jump to current")
    "d n" '(neotree-dir :wk "Open directory in neotree")
    "d p" '(peep-dired :wk "Peep-dired"))

  (dt/leader-keys
    "e" '(:ignore t :wk "Eshell/Evaluate")    
    "e b" '(eval-buffer :wk "Evaluate elisp in buffer")
    "e d" '(eval-defun :wk "Evaluate defun containing or after point")
    "e e" '(eval-expression :wk "Evaluate and elisp expression")
    "e h" '(counsel-esh-history :which-key "Eshell history")
    "e l" '(eval-last-sexp :wk "Evaluate elisp expression before point")
    "e r" '(eval-region :wk "Evaluate elisp in region")
    "e s" '(eshell :which-key "Eshell"))

 (dt/leader-keys
    "h" '(:ignore t :wk "Help")
    "h b" '(describe-bindings :wk "Describe bindings")
    "h f" '(describe-function :wk "Describe function")
    "h t" '(load-theme :wk "Load theme")
    "h v" '(describe-variable :wk "Describe variable")
    "h r r" '((lambda () (interactive)
                (load-file "~/.config/emacs/init.el")
                (ignore (elpaca-process-queues)))
              :wk "Reload emacs config"))

  (dt/leader-keys
    "m" '(:ignore t :wk "Org")
    "m a" '(org-agenda :wk "Org agenda")
    "m e" '(org-export-dispatch :wk "Org export dispatch")
    "m i" '(org-toggle-item :wk "Org toggle item")
    "m t" '(org-todo :wk "Org todo")
    "m B" '(org-babel-tangle :wk "Org babel tangle")
    "m T" '(org-todo-list :wk "Org todo list"))

  (dt/leader-keys
    "m b" '(:ignore t :wk "Tables")
    "m b -" '(org-table-insert-hline :wk "Insert hline in table"))

  (dt/leader-keys
    "m d" '(:ignore t :wk "Date/deadline")
    "m d t" '(org-time-stamp :wk "Org time stamp"))

  (dt/leader-keys
    "p" '(projectile-command-map :wk "Projectile"))

  (dt/leader-keys
    "t" '(:ignore t :wk "Toggle")
    "t e" '(eshell-toggle :wk "Toggle eshell")
    "t l" '(display-line-numbers-mode :wk "Toggle line numbers")
    "t n" '(neotree-toggle :wk "Toggle neotree file viewer")
    "t t" '(visual-line-mode :wk "Toggle truncated lines")
    "t v" '(vterm-toggle :wk "Toggle vterm"))

  (dt/leader-keys
    "w" '(:ignore t :wk "Windows")
    ;; Window splits
    "w c" '(evil-window-delete :wk "Close window")
    "w n" '(evil-window-new :wk "New window")
    "w s" '(evil-window-split :wk "Horizontal split window")
    "w v" '(evil-window-vsplit :wk "Vertical split window")
    ;; Window motions
    "w h" '(evil-window-left :wk "Window left")
    "w j" '(evil-window-down :wk "Window down")
    "w k" '(evil-window-up :wk "Window up")
    "w l" '(evil-window-right :wk "Window right")
    "w w" '(evil-window-next :wk "Goto next window")
    ;; Move Windows
    "w H" '(buf-move-left :wk "Buffer move left")
    "w J" '(buf-move-down :wk "Buffer move down")
    "w K" '(buf-move-up :wk "Buffer move up")
    "w L" '(buf-move-right :wk "Buffer move right"))
)

#+end_src

* GRAPHICAL USER INTERFACE TWEAKS
Let's make GNU Emacs look a little better.

** Disable Menubar, Toolbars and Scrollbars
#+begin_src emacs-lisp
(menu-bar-mode -1)
(tool-bar-mode -1)
(scroll-bar-mode -1)
#+end_src

** Display Line Numbers and Truncated Lines
#+begin_src emacs-lisp
(global-display-line-numbers-mode 1)
(global-visual-line-mode t)
#+end_src

* IVY (COUNSEL)
+ Ivy, a generic completion mechanism for Emacs.
+ Counsel, a collection of Ivy-enhanced versions of common Emacs commands.
+ Ivy-rich allows us to add descriptions alongside the commands in M-x.

#+begin_src emacs-lisp
(use-package counsel
  :after ivy
  :diminish
  :config (counsel-mode))

(use-package ivy
  :bind
  ;; ivy-resume resumes the last Ivy-based completion.
  (("C-c C-r" . ivy-resume)
   ("C-x B" . ivy-switch-buffer-other-window))
  :diminish
  :custom
  (setq ivy-use-virtual-buffers t)
  (setq ivy-count-format "(%d/%d) ")
  (setq enable-recursive-minibuffers t)
  :config
  (ivy-mode))

(use-package all-the-icons-ivy-rich
  :ensure t
  :init (all-the-icons-ivy-rich-mode 1))

(use-package ivy-rich
  :after ivy
  :ensure t
  :init (ivy-rich-mode 1) ;; this gets us descriptions in M-x.
  :custom
  (ivy-virtual-abbreviate 'full
   ivy-rich-switch-buffer-align-virtual-buffer t
   ivy-rich-path-style 'abbrev)
  :config
  (ivy-set-display-transformer 'ivy-switch-buffer
                               'ivy-rich-switch-buffer-transformer))

#+end_src

* LANGUAGE SUPPORT
Emacs has built-in programming language modes for Lisp, Scheme, DSSSL, Ada, ASM, AWK, C, C++, Fortran, Icon, IDL (CORBA), IDLWAVE, Java, Javascript, M4, Makefiles, Metafont, Modula2, Object Pascal, Objective-C, Octave, Pascal, Perl, Pike, PostScript, Prolog, Python, Ruby, Simula, SQL, Tcl, Verilog, and VHDL.  Other languages will require you to install additional modes.

#+begin_src emacs-lisp
(use-package haskell-mode)
(use-package lua-mode)

#+end_src

* MODELINE
The modeline is the bottom status bar that appears in Emacs windows.  While you can create your own custom modeline, why go to the trouble when Doom Emacs already has a nice modeline package available.  For more information on what is available to configure in the Doom modeline, check out: [[https://github.com/seagle0128/doom-modeline][Doom Modeline]]

#+begin_src emacs-lisp
(use-package doom-modeline
  :ensure t
  :init (doom-modeline-mode 1)
  :config
  (setq doom-modeline-height 30      ;; sets modeline height
        doom-modeline-bar-width 5    ;; sets right bar width
        doom-modeline-persp-name t   ;; adds perspective name to modeline
        doom-modeline-persp-icon t)) ;; adds folder icon next to persp name

#+end_src

* NEOTREE
Neotree is a file tree viewer.  When you open neotree, it jumps to the current file thanks to neo-smart-open.  The neo-window-fixed-size setting makes the neotree width be adjustable.  NeoTree provides following themes: classic, ascii, arrow, icons, and nerd.  Theme can be config'd by setting "two" themes for neo-theme: one for the GUI and one for the terminal.  I like to use 'SPC t' for 'toggle' keybindings, so I have used 'SPC t n' for toggle-neotree.

| COMMAND        | DESCRIPTION               | KEYBINDING |
|----------------+---------------------------+------------|
| neotree-toggle | /Toggle neotree/            | SPC t n    |
| neotree- dir   | /Open directory in neotree/ | SPC d n    |

#+BEGIN_SRC emacs-lisp
(use-package neotree
  :config
  (setq neo-smart-open t
        neo-show-hidden-files t
        neo-window-width 55
        neo-window-fixed-size nil
        inhibit-compacting-font-caches t
        projectile-switch-project-action 'neotree-projectile-action) 
        ;; truncate long file names in neotree
        (add-hook 'neo-after-create-hook
           #'(lambda (_)
               (with-current-buffer (get-buffer neo-buffer-name)
                 (setq truncate-lines t)
                 (setq word-wrap nil)
                 (make-local-variable 'auto-hscroll-mode)
                 (setq auto-hscroll-mode nil)))))

#+end_src

* ORG MODE
** Enabling Table of Contents
#+begin_src emacs-lisp
(use-package toc-org
    :commands toc-org-enable
    :init (add-hook 'org-mode-hook 'toc-org-enable))
#+end_src

** Enabling Org Bullets
Org-bullets gives us attractive bullets rather than asterisks.

#+begin_src emacs-lisp
(add-hook 'org-mode-hook 'org-indent-mode)
(use-package org-bullets)
(add-hook 'org-mode-hook (lambda () (org-bullets-mode 1)))
#+end_src

** Disable Electric Indent
Org mode source blocks have some really weird and annoying default indentation behavior.  I think this has to do with electric-indent-mode, which is turned on by default in Emacs, and the fact that Org defaults to indenting 2 spaces in source blocks.  So let's turn it all of that OFF!

#+begin_src emacs-lisp
(electric-indent-mode -1)
(setq org-edit-src-content-indentation 0)
#+end_src

** Diminish Org Indent Mode
Removes "Ind" from showing in the modeline.

#+begin_src emacs-lisp
(eval-after-load 'org-indent '(diminish 'org-indent-mode))

#+end_src

** Org Level Headers
#+begin_src emacs-lisp
  (custom-set-faces
   '(org-level-1 ((t (:inherit outline-1 :height 1.7))))
   '(org-level-2 ((t (:inherit outline-2 :height 1.6))))
   '(org-level-3 ((t (:inherit outline-3 :height 1.5))))
   '(org-level-4 ((t (:inherit outline-4 :height 1.4))))
   '(org-level-5 ((t (:inherit outline-5 :height 1.3))))
   '(org-level-6 ((t (:inherit outline-5 :height 1.2))))
   '(org-level-7 ((t (:inherit outline-5 :height 1.1)))))
#+end_src

** Source Code Block Tag Expansion
Org-tempo is not a separate package but a module within org that can be enabled.  Org-tempo allows for '<s' followed by TAB to expand to a begin_src tag.  Other expansions available include:

| Typing the below + TAB | Expands to ...                          |
|------------------------+-----------------------------------------|
| <a                     | '#+BEGIN_EXPORT ascii' … '#+END_EXPORT  |
| <c                     | '#+BEGIN_CENTER' … '#+END_CENTER'       |
| <C                     | '#+BEGIN_COMMENT' … '#+END_COMMENT'     |
| <e                     | '#+BEGIN_EXAMPLE' … '#+END_EXAMPLE'     |
| <E                     | '#+BEGIN_EXPORT' … '#+END_EXPORT'       |
| <h                     | '#+BEGIN_EXPORT html' … '#+END_EXPORT'  |
| <l                     | '#+BEGIN_EXPORT latex' … '#+END_EXPORT' |
| <q                     | '#+BEGIN_QUOTE' … '#+END_QUOTE'         |
| <s                     | '#+BEGIN_SRC' … '#+END_SRC'             |
| <v                     | '#+BEGIN_VERSE' … '#+END_VERSE'         |

#+begin_src emacs-lisp 
(require 'org-tempo)
#+end_src

* PROJECTILE
[[https://github.com/bbatsov/projectile][Projectile]] is a project interaction library for Emacs.  It should be noted that many projectile commands do not work if you have set "fish" as the "shell-file-name" for Emacs.  I had initially set "fish" as the "shell-file-name" in the Vterm section of this config, but oddly enough I changed it to "bin/sh" and projectile now works as expected, and Vterm still uses "fish" because my default user "sh" on my Linux system is "fish".

#+begin_src emacs-lisp
(use-package projectile
  :config
  (projectile-mode 1))
#+end_src

* RAINBOW MODE
Display the actual color as a background for any hex color value (ex. #ffffff).  The code block below enables rainbow-mode in all programming modes (prog-mode) as well as org-mode, which is why rainbow works in this document.  

#+begin_src emacs-lisp
(use-package rainbow-mode
  :diminish
  :hook org-mode prog-mode)
#+end_src

* SHELLS AND TERMINALS
In my configs, all of my shells (bash, fish, zsh and the ESHELL) require my shell-color-scripts-git package to be installed.  On Arch Linux, you can install it from the AUR.  Otherwise, go to my shell-color-scripts repository on GitLab to get it.

** Eshell
Eshell is an Emacs 'shell' that is written in Elisp.

#+begin_src emacs-lisp
(use-package eshell-toggle
  :custom
  (eshell-toggle-size-fraction 3)
  (eshell-toggle-use-projectile-root t)
  (eshell-toggle-run-command nil)
  (eshell-toggle-init-function #'eshell-toggle-init-ansi-term))

  (use-package eshell-syntax-highlighting
    :after esh-mode
    :config
    (eshell-syntax-highlighting-global-mode +1))

  ;; eshell-syntax-highlighting -- adds fish/zsh-like syntax highlighting.
  ;; eshell-rc-script -- your profile for eshell; like a bashrc for eshell.
  ;; eshell-aliases-file -- sets an aliases file for the eshell.

  (setq eshell-rc-script (concat user-emacs-directory "eshell/profile")
        eshell-aliases-file (concat user-emacs-directory "eshell/aliases")
        eshell-history-size 5000
        eshell-buffer-maximum-lines 5000
        eshell-hist-ignoredups t
        eshell-scroll-to-bottom-on-input t
        eshell-destroy-buffer-when-process-dies t
        eshell-visual-commands'("bash" "fish" "htop" "ssh" "top" "zsh"))
#+end_src

** Vterm
Vterm is a terminal emulator within Emacs.  The 'shell-file-name' setting sets the shell to be used in M-x shell, M-x term, M-x ansi-term and M-x vterm.  By default, the shell is set to 'fish' but could change it to 'bash' or 'zsh' if you prefer.

#+begin_src emacs-lisp
(use-package vterm
:config
(setq shell-file-name "/bin/sh"
      vterm-max-scrollback 5000))
#+end_src

** Vterm-Toggle 
[[https://github.com/jixiuf/vterm-toggle][vterm-toggle]] toggles between the vterm buffer and whatever buffer you are editing.

#+begin_src emacs-lisp
(use-package vterm-toggle
  :after vterm
  :config
  (setq vterm-toggle-fullscreen-p nil)
  (setq vterm-toggle-scope 'project)
  (add-to-list 'display-buffer-alist
               '((lambda (buffer-or-name _)
                     (let ((buffer (get-buffer buffer-or-name)))
                       (with-current-buffer buffer
                         (or (equal major-mode 'vterm-mode)
                             (string-prefix-p vterm-buffer-name (buffer-name buffer))))))
                  (display-buffer-reuse-window display-buffer-at-bottom)
                  ;;(display-buffer-reuse-window display-buffer-in-direction)
                  ;;display-buffer-in-direction/direction/dedicated is added in emacs27
                  ;;(direction . bottom)
                  ;;(dedicated . t) ;dedicated is supported in emacs27
                  (reusable-frames . visible)
                  (window-height . 0.4))))
#+end_src

* SUDO EDIT
[[https://github.com/nflath/sudo-edit][sudo-edit]] gives us the ability to open files with sudo privileges or switch over to editing with sudo privileges if we initially opened the file without such privileges.

#+begin_src emacs-lisp
(use-package sudo-edit
  :config
    (dt/leader-keys
      "fu" '(sudo-edit-find-file :wk "Sudo find file")
      "fU" '(sudo-edit :wk "Sudo edit file")))
#+end_src

* THEME
The first line below designates the directory where will place all of our custom-made themes, which I have created only one (dtmacs).  You can create your own Emacs themes with the help of the [[https://emacsfodder.github.io/emacs-theme-editor/][Emacs Theme Editor]].  I am also installing =doom-themes= because it contains a huge collection of themes.  M-x load-theme will list all of the themes available.

#+begin_src emacs-lisp
(add-to-list 'custom-theme-load-path "~/.config/emacs/themes/")

(use-package doom-themes
  :config
  (setq doom-themes-enable-bold t    ; if nil, bold is universally disabled
        doom-themes-enable-italic t) ; if nil, italics is universally disabled
  ;; Sets the default theme to load!!! 
  (load-theme 'doom-one t)
  ;; Enable custom neotree theme (all-the-icons must be installed!)
  (doom-themes-neotree-config)
  ;; Corrects (and improves) org-mode's native fontification.
  (doom-themes-org-config))
#+end_src

* TRANSPARENCY
With Emacs version 29, true transparency has been added.  I have turned transparency off by setting the alpha to '100'.  If you want some slight transparency, try setting alpha to '90'.  Of course, if you set alpha to '0', the background of Emacs would completely transparent.

#+begin_src emacs-lisp
(add-to-list 'default-frame-alist '(alpha-background . 100)) ; For all new frames henceforth

#+end_src

* WHICH-KEY
#+begin_src emacs-lisp
(use-package which-key
  :init
    (which-key-mode 1)
  :diminish
  :config
  (setq which-key-side-window-location 'bottom
	  which-key-sort-order #'which-key-key-order
	  which-key-allow-imprecise-window-fit nil
	  which-key-sort-uppercase-first nil
	  which-key-add-column-padding 1
	  which-key-max-display-columns nil
	  which-key-min-display-lines 6
	  which-key-side-window-slot -10
	  which-key-side-window-max-height 0.25
	  which-key-idle-delay 0.8
	  which-key-max-description-length 25
	  which-key-allow-imprecise-window-fit nil
	  which-key-separator " → " ))
#+end_src

