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#+title: Emacs Config
#+property: header-args:elisp :mkdirp yes :results silent :padline no
#+property: header-args:elisp+ :tangle "~/.config/emacs/init.el"
* General
** Settings
Quality of life settings.
#+begin_src elisp
(setq-default
help-window-select t
delete-by-moving-to-trash t
sentence-end-double-space nil
confirm-kill-emacs 'yes-or-no-p
scroll-conservatively 101
cursor-in-non-selected-windows nil)
#+end_src
** Startup Screen
Disable default startup screen.
#+begin_src elisp
(setq-default inhibit-startup-screen t)
#+end_src
** GUI Bars
Disable GUI bars.
#+begin_src elisp
(tool-bar-mode -1)
(menu-bar-mode -1)
(scroll-bar-mode -1)
#+end_src
** Editor
Tab behaviour settings.
#+begin_src elisp
(setq-default
tab-width 4
tab-always-indent 'complete
backward-delete-char-untabify-method 'hungry
indent-tabs-mode nil)
#+end_src
Replace selected region when yanking text.
#+begin_src elisp
(delete-selection-mode)
#+end_src
Automatically remove trailing whitespace on file-save.
#+begin_src elisp
(add-hook 'before-save-hook #'whitespace-cleanup)
#+end_src
Increase default column width.
#+begin_src elisp
(setq-default fill-column 80)
#+end_src
Set whitespace column length and symbols.
#+begin_src elisp
(with-eval-after-load 'whitespace
(setq-default
whitespace-line-column fill-column
whitespace-display-mappings '((space-mark ?\s [?·] [?.])
(newline-mark ?\n [?↴ ?\n])
(tab-mark ?\t [?➔ ?\t] [?\\ ?\t]))))
#+end_src
** Theme
Enable theme.
#+begin_src elisp
(load-theme 'modus-vivendi)
#+end_src
** Completion
Enable completions previews.
#+begin_src elisp
(add-hook 'prog-mode-hook
#'completion-preview-mode)
#+end_src
Set completion keybindings.
#+begin_src elisp
(with-eval-after-load 'completion-preview
(let ((map completion-preview-active-mode-map))
(keymap-set map "M-n" #'completion-preview-next-candidate)
(keymap-set map "M-p" #'completion-preview-prev-candidate)))
#+end_src
** Which-key
Enable which-key that displays a pop-up window of posisble keybindings sequences.
#+begin_src elisp
(which-key-mode)
#+end_src
** History
*** Minibuffer History
Enable saving minibuffer history.
#+begin_src elisp
(savehist-mode)
#+end_src
Automatically save history on exit.
#+begin_example elisp
(add-hook 'kill-emacs-hook #'savehist-save)
#+end_example
Ensure savehist file is loaded.
#+begin_src elisp
(unless savehist-loaded
(load-file savehist-file))
#+end_src
Add addtional variable lists to save.
#+begin_src elisp
(dolist (var '(command-history
register-alist
mark-ring
kill-ring
search-ring
regexp-search-ring))
(cl-pushnew var savehist-additional-variables))
#+end_src
* Global Keybindings
Unlock previously unusable keybinding.
#+begin_src elisp
(define-key input-decode-map [?\C-\[] (kbd "<C-[>"))
#+end_src
File actions.
#+begin_src elisp
(keymap-global-set "C-x x R" #'rename-visited-file)
(keymap-global-set "C-x x D" #'delete-file)
#+end_src
Window actions.
#+begin_src elisp
(keymap-global-set "M-o" #'other-window)
(keymap-global-set "M-O" #'window-swap-states)
(keymap-global-set "M-V" #'scroll-other-window-down)
(keymap-global-set "C-S-V" #'scroll-other-window)
(keymap-global-set "C-M-<" #'beginning-of-buffer-other-window)
(keymap-global-set "C-M->" #'end-of-buffer-other-window)
(keymap-global-set "C-M-]" #'next-buffer)
(keymap-global-set "M-ESC" #'previous-buffer) ; C-M-[ translates to M-ESC
#+end_src
Set meta-key quick actions to mirror =C-x DIGIT= bindings, therefore reducing the need for additional keypresses.
These bindings override their corresponding numerical argument, however these can be can be alternatively called with =C-u DIGIT= or =C-DIGIT=.
#+begin_src elisp
(keymap-global-set "C-M-0" #'kill-buffer-and-window)
(keymap-global-set "C-M--" #'kill-this-buffer)
(keymap-global-set "M-0" #'delete-window)
(keymap-global-set "M-1" #'delete-other-windows)
(keymap-global-set "M-2" #'split-window-below)
(keymap-global-set "M-3" #'split-window-right)
(keymap-global-set "M-4" #'ctl-x-4-prefix)
(keymap-global-set "M-5" #'ctl-x-5-prefix)
(keymap-global-set "M-6" (keymap-global-lookup "C-x 6"))
;; (keymap-global-set "M-7" (keymap-global-lookup "C-x 7"))
(keymap-global-set "M-8" (keymap-global-lookup "C-x 8"))
;; (keymap-global-set "M-9" (keymap-global-lookup "C-x 9"))
#+end_src
Tab actions.
#+begin_src elisp
(keymap-global-set "C-x C-<tab>" #'tab-new)
(keymap-global-set "C-x C-<backspace>" #'tab-close)
(keymap-global-set "C-x t l" #'tab-list)
(keymap-global-set "C-x t <tab>" #'toggle-frame-tab-bar)
#+end_src
Improve region text manipulation.
#+begin_src elisp
(keymap-global-set "M-c" #'capitalize-dwim)
(keymap-global-set "M-l" #'downcase-dwim)
(keymap-global-set "M-u" #'upcase-dwim)
(keymap-global-set "M-U" #'upcase-char)
#+end_src
Help actions.
#+begin_src elisp
(keymap-global-set "C-h M" #'describe-keymap)
(keymap-global-set "C-h j" #'describe-char)
#+end_src
Display modes.
#+begin_src elisp
(keymap-global-set "C-x x c" #'display-fill-column-indicator-mode)
(keymap-global-set "C-x x l" #'display-line-numbers-mode)
(keymap-global-set "C-x x h" #'hl-line-mode)
(keymap-global-set "C-x x o" #'overwrite-mode)
(keymap-global-set "C-x x s" #'prettify-symbols-mode)
(keymap-global-set "C-x x w" #'visual-line-mode)
(keymap-global-set "C-x x SPC" #'whitespace-mode)
#+end_src
* Version Control
Rebind diff-mode's ~diff-goto-source~ keybinding due to conflict with =M-o=.
#+begin_src elisp
(with-eval-after-load 'diff-mode
(keymap-set diff-mode-map "M-o" #'other-window)
(keymap-set diff-mode-map "M-j" #'diff-goto-source))
#+end_src
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