emacs/README.org

#+PROPERTY: header-args:emacs-lisp :tangle yes

* My Emacs' configuration

This is my Emacs configuration, it's written as [[https://www.wikiwand.com/en/Literate_programming][literate programming]]
using [[https://orgmode.org/][org-mode]]'s Babel.
All the settings are enclosed inside this single file named
[[README.org]], the reason of this choice is that many services (like
GitHub) automatically looks for these names.
The configuration of different Emacs' aspects are kept divided in
different paragraphs. 

This file must be considered part of the Git repository to which it
belongs and it may not work properly without the other files.
Despite I mainly use [[https://nixos.org][NixOS]] I chose to keep my Emacs configuration
detached from my Nix files, this way I should be able get my Emacs'
settings in a non-Nix environment.

However the installing process of the required packages is not managed
by this configuration; for example on my NixOS system I use the
[[https://github.com/nix-community/emacs-overlay][emacs-overlay]] which automatically parses this file looking for the
~(use-package <package>)~ declarations and then downloads and builds
the latest versions from MELPA.
I preferred to maintain this agnostic approach in order to don't make
this already dense file even more complex.
Indeed, as it's configured, ~use-package~ should ensure that the
packages are installed, and if this is not the case it should install
them.

I use [[https://github.com/ch11ng/exwm][EXWM]] (i.e. Emacs X Window Manager) but since I wanted to keep
the possibility to use this configuration also on different systems
(maybe without X.org) I tried to isolate its settings.
So, even if I never tried, it should be easy to disable it without
consequences.

** General settings
This snippet contatins different things that I wasn't able to gather
better.
Hopefully, in a future, this section won't exist anymore.

#+begin_src emacs-lisp 
  (setq create-lockfiles nil)
  (setq backup-directory-alist '((".*" . "~/.emacs-saves/")))
  (setq auto-save-file-name-transforms '((".*" "~/.emacs-saves/" t)))
  (setq backup-by-copying t)
  (setq delete-old-versions t
	kept-new-versions 6
	kept-old-versions 2
	version-control t)

  (defalias 'yes-or-no-p 'y-or-n-p)
  (setq use-dialog-box nil)
  (menu-bar-mode -1)
  (tool-bar-mode -1)
  (scroll-bar-mode -1)
  (fringe-mode 1)
  (setq display-time-format "%H:%M")
  (display-time-mode 1)
  (setq mouse-autoselect-window 't)

  (setq inhibit-startup-screen t)

  (setq async-shell-command-buffer 'new-buffer)
  (add-hook 'prog-mode-hook 'display-line-numbers-mode)
  (add-hook 'prog-mode-hook 'hl-line-mode)
  (add-hook 'org-mode-hook 'auto-fill-mode)
  (set-fill-column 80)

  (add-to-list 'default-frame-alist '(font . "Fira Code-12"))
  (set-face-attribute 'default t :font "Fira Code-12")

  (setq show-paren-delay 0)
  (set-face-background 'show-paren-match "#111")
  (set-face-attribute 'show-paren-match nil :weight 'extra-bold)
  (show-paren-mode 1)

  (add-hook 'text-mode-hook
	    (lambda () (set-input-method "italian-postfix")))
#+end_src

** Theming
I'm using the ~doom-one~ theme from the ~doom-themes~ package.
In addition it's loaded the ~all-the-icons~ fonts and a special
modeline from ~doom-modeline~.

#+begin_src emacs-lisp 
  (use-package doom-themes
    :config
    ;; Global settings (defaults)
    (setq doom-themes-enable-bold t    ; if nil, bold is universally disabled
	  doom-themes-enable-italic t) ; if nil, italics is universally disabled
    (load-theme 'doom-one t)

    ;; Enable flashing mode-line on errors
    (doom-themes-visual-bell-config)
  
    (setq doom-themes-treemacs-theme "doom-colors") ; use the colorful treemacs theme
    (doom-themes-treemacs-config)
  
    ;; Corrects (and improves) org-mode's native fontification.
    (doom-themes-org-config)
    )

  (set-frame-parameter (selected-frame) 'alpha '(98 . 98))
  (add-to-list 'default-frame-alist '(alpha . (98 . 98)))

  (use-package all-the-icons)

  (use-package doom-modeline
    :init (doom-modeline-mode 1))

  (use-package fira-code-mode
    :hook prog-mode
    :config (setq fira-code-mode-disabled-ligatures '("x")))
#+end_src

** Evil 
In a future I think I'll try the Emacs keybindings, but for now I
prefer the Vim keybindings, at least for the text editing.
Since I use small keyboards I think it's better to use a modal editor,
however for everything that is not text editing I use the normal Emacs
keybindings.
#+begin_src emacs-lisp
  (use-package evil
    :init
    (setq evil-want-keybinding nil)
    :config
    (progn
      (evil-mode 1) ; globally enable evil-mode except for the following modes
      (mapcar (lambda (mode) (evil-set-initial-state mode 'emacs))
	      '(vterm-mode
		eshell-mode
		dired-mode
		))))

  (use-package evil-collection
    :after (evil company-mode vterm)
    :config
    (evil-collection-init))

  (use-package org-evil)
#+end_src

** Org configuration

#+begin_src emacs-lisp 
  (require 'org-protocol)
  (setq org-default-notes-file (concat org-directory "~/notes.org"))
  (setq org-capture-templates `(
				("p" "Protocol" entry (file+headline ,(concat org-directory "notes.org") "Inbox")
				 "* %^{Title}\nSource: %u, %c\n #+BEGIN_QUOTE\n%i\n#+END_QUOTE\n\n\n%?")
				("L" "Protocol Link" entry (file+headline ,(concat org-directory "notes.org") "Inbox")
				 "* %? [[%:link][%:description]] \nCaptured On: %U")
				))

  (org-babel-do-load-languages
   'org-babel-load-languages
   '((python . t)))

  (setq safe-local-variable-values '((eval add-hook 'after-save-hook 'org-icalendar-export-to-ics nil t)))

  (setq org-agenda-files '("~/nas/syncthing/orgzly/Agenda.org" "~/nas/syncthing/orgzly/Lavoro.org"))

  (setq org-format-latex-options (plist-put org-format-latex-options :scale 1.6))
  ;;(use-package org-fragtog
  ;;  :hook (org-mode org-fragtog))
#+end_src

** Helm
Unfortunately this is currently unmantained (there was only a
mantainer, who devoted himself to it for years) but I hope that
someone in the near future will pick up the project.
However this is really stable and I never had problems.

#+begin_src emacs-lisp
(use-package helm
  :init
  (progn
    (require 'helm-config)
    (setq helm-autoresize-max-height 0)
    (setq helm-autoresize-min-height 20)
    (global-set-key (kbd "C-c h") 'helm-command-prefix)
    (global-unset-key (kbd "C-x c"))

    (when (executable-find "ack")
      (setq helm-grep-default-command "ack -Hn --no-group --no-color %e %p %f"
	    helm-grep-default-recurse-command "ack -H --no-group --no-color %e %p %f"))

    (setq helm-semantic-fuzzy-match t
	  helm-imenu-fuzzy-match t
	  helm-M-x-fuzzy-match t ;; optional fuzzy matching for helm-M-x
	  helm-buffers-fuzzy-matching t
	  helm-recentf-fuzzy-match t
	  helm-split-window-in-side-p t
	  helm-buffer-max-length nil)

    (helm-mode 1)
    (helm-autoresize-mode 1))

  :bind
  (("C-c h" . helm-command-prefix)
   :map helm-command-map
   ("b" . helm-buffers-list)
   ("f" . helm-find-files)
   ("m" . helm-mini)
   ("o" . helm-imenu))
  :bind
  (("M-x" . helm-M-x)
   ("M-y" . helm-show-kill-ring)
   ("C-x b" . helm-mini)
   ("C-x C-f" . helm-find-files)))
#+end_src

** Programming
*** FlyCheck

#+begin_src emacs-lisp
  (use-package flycheck
    :init (global-flycheck-mode))
  (use-package company
    :init (global-company-mode))
  (use-package company-quickhelp
    :straight t
    :config
    (company-quickhelp-mode))
  (use-package company-try-hard
    :straight t
    :bind
    (("C-<tab>" . company-try-hard)
     :map company-active-map
     ("C-<tab>" . company-try-hard)))
#+end_src

*** Solidity
    
#+begin_src emacs-lisp
  (use-package solidity-flycheck
    :init (setq solidity-flycheck-solc-checker-active t)) ;requires solc in PATH
#+end_src

*** Python
#+begin_src emacs-lisp
  (use-package elpy
    :init (elpy-enable)
    :config :config
    (setq elpy-modules (delq 'elpy-module-flymake elpy-modules))
    )
  (use-package blacken)
  (use-package python-flycheck
    :init (setq elpy-modules (delq 'elpy-module-flymake elpy-modules)))
  (use-package company-jedi)
#+end_src

*** Haskell
    #+begin_src emacs-lisp
(use-package haskell-mode)
    #+end_src

*** Nix
    #+begin_src emacs-lisp
(use-package nix-mode
  :mode "\\.nix\\'")

;;(use-package company-nixos-options
;;  :after company
;;  :config
;;  (progn
;;    (add-to-list 'company-backends 'company-nixos-options)))

(use-package helm-nixos-options)
#+end_src



** Edit-server
This package allows to edit a textbox in a browser (with the related
extension installed) using an Emacs buffer.
#+begin_src emacs-lisp
  (use-package atomic-chrome
    :config (atomic-chrome-start-server))
#+end_src