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early-init.el
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early-init.el
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;;; early-init.el --- Emacs Early Init -*- lexical-binding: t; -*-
;;; Commentary:
;; DEBUG FLAGS
;; Debug flags are default on while this config is loading since errors should
;; be loud and highly noticeable. They are restored to their default off once
;; the config has completed.
;; STARTUP PERFORMANCE
;; Increasing garbage collection to a very high number decreases startup time.
;; setting the file-name-handler and vc-handled-backends avoids some regexp
;; slowness during startup. All original values are restored once Emacs is
;; finished with startup.
;; LOCAL REPOSITORIES
;; This config doesn't work if the packages it relies on fail. Having local
;; package repositories also allows for full config portability behind corporate
;; firewalls and fast recovery from package issues no matter the network
;; situation.
;; The localrepo directory contains all the last known good packages for this
;; config. The directory is added as a repository to the package archive list
;; first, and given the highest priority number. This allows for a portable
;; installation and reinstallation. This directory averages ~70 MB.
;; Having a full local mirror of all elpa, melpa, and org repositories gives you
;; more flexibility but at a higher storage cost. The script
;; 'create-elpa-mirror.sh in user-emacs-directory/scripts directory will clone
;; them all locally. As of Saturday, March 30, 2024 the directory containing all
;; gnu, nongnu, melpa, melpa-stable, and org packages takes around 1.9 GB.
;; For more information on the localrepo and elpa mirrors, read the commentary
;; in local-repository.el.
;;; Code:
;; -------------------------------- Debug Flags --------------------------------
;; debugging enabled during Emacs startup. disabled again after Emacs startup.
(setq debug-on-error t) ;; default nil. turn on to debug issues only.
(setq debug-on-quit t) ;; debug on C-g (breaking out of hangs/freezes)
(add-hook 'emacs-startup-hook
(lambda ()
(setq debug-on-error nil)
(setq debug-on-quit nil)))
;; --------------------------- Warning Notifications ---------------------------
;; log warnings, but don't popup the warnings buffer
(setq native-comp-async-report-warnings-errors 'silent)
;; skip warnings but notify me about errors
(setq warning-minimum-level :error)
;; --------------------------- Use Online Repos Flag ---------------------------
;; set to nil to only use localrepo and local elpa-mirrors (see script directory)
(defvar cj/use-online-repos t
"Whether to check for network connectivity and use online package repositories.")
;; ---------------------------- Startup Performance ----------------------------
;; increases garbage collection threshold, and turns off file-name-handler and
;; vc-backends during startup and restores the settings once emacs has loaded.
(defvar cj/orig-gc-cons-threshold gc-cons-threshold
"Temporary variable to allow restoration of value post-startup.")
(setq gc-cons-threshold most-positive-fixnum)
(defvar cj/orig-file-name-handler-alist file-name-handler-alist
"Temporary variable to allow restoration of value post-startup.")
(setq file-name-handler-alist nil)
(defvar cj/orig-vc-handled-backends vc-handled-backends
"Temporary variable to allow restoration of value post-startup.")
(setq vc-handled-backends nil)
(add-hook 'emacs-startup-hook
(lambda ()
(setq gc-cons-threshold cj/orig-gc-cons-threshold
file-name-handler-alist cj/orig-file-name-handler-alist
vc-handled-backends cj/orig-vc-handled-backends)))
;; ------------------------------ Site Start Files -----------------------------
;; don't load site-start or default.el files
(setq inhibit-default-init t)
;; ------------------------------- Network Check -------------------------------
;; checks if the network is available. used for online repo enablement.
(defun internet-up-p (&optional host)
"Test for network connectivity by pinging HOST."
(= 0 (call-process "ping" nil nil nil "-c" "1" "-W" "1"
(if host host "www.google.com"))))
;; ----------------------------- Package Management ----------------------------
;; detect the availability of online and local repositories before adding them.
;; the order and priority is localrepo, local mirrors, then online repositories.
(require 'package) ;; emacs built-in
(defconst user-home-dir (getenv "HOME")
"The user's home directory per the environment variable.")
(defconst elpa-mirror-location "/media/repos/elpa-mirror/"
"The path to the elpa mirror location.")
(defconst localrepo-location (concat user-emacs-directory ".localrepo/")
"The path to your local Emacs package repository.
For more information about the local Emacs package repository, see comments in
early-init.el.")
(setq package-archives nil) ;; package-archives will be added below
;; LOCAL REPOSITORY (packages in version control)
(if (file-accessible-directory-p localrepo-location)
(progn
(add-to-list 'package-archives (cons "localrepo" localrepo-location) t)
(add-to-list 'package-archive-priorities '(("localrepo". 200)))))
;; LOCAL REPOSITORY ELPA MIRRORS
(if (file-accessible-directory-p (concat elpa-mirror-location "gnu"))
(progn
(add-to-list 'package-archives (cons "gnu-local" (concat elpa-mirror-location "gnu/"))t)
(add-to-list 'package-archive-priorities '("gnu-local" . 125))))
(if (file-accessible-directory-p (concat elpa-mirror-location "nongnu"))
(progn
(add-to-list 'package-archives (cons "nongnu-local" (concat elpa-mirror-location "nongnu/"))t)
(add-to-list 'package-archive-priorities '("nongnu-local" . 120))))
(if (file-accessible-directory-p (concat elpa-mirror-location "melpa"))
(progn
(add-to-list 'package-archives (cons "melpa-local" (concat elpa-mirror-location "melpa/"))t)
(add-to-list 'package-archive-priorities '("melpa-local" . 115))))
(if (file-accessible-directory-p (concat elpa-mirror-location "stable-melpa"))
(progn
(add-to-list 'package-archives (cons "melpa-stable-local" (concat elpa-mirror-location "stable-melpa/"))t)
(add-to-list 'package-archive-priorities '("melpa-stable" . 100))))
;; ONLINE REPOSITORIES
(when (and (boundp 'cj/use-online-repos) cj/use-online-repos (internet-up-p))
(progn
(add-to-list 'package-archives '("gnu". "https://elpa.gnu.org/packages/") t)
(add-to-list 'package-archive-priorities '("gnu" . 25))
(add-to-list 'package-archives '("nongnu" . "https://elpa.nongnu.org/nongnu/") t)
(add-to-list 'package-archive-priorities '("nongnu" . 20))
(add-to-list 'package-archives '("melpa". "https://melpa.org/packages/") t)
(add-to-list 'package-archive-priorities '("melpa" . 15))
;; (add-to-list 'package-archives '("org". "https://orgmode.org/packages/") t)
;; (add-to-list 'package-archive-priorities '("org" . 10))
(add-to-list 'package-archives '("melpa-stable" . "https://stable.melpa.org/packages/") t)
(add-to-list 'package-archive-priorities '("melpa-stable" . 5))))
(package-initialize)
;; only run refresh when there's no cache
(when (not package-archive-contents)
(package-refresh-contents))
;; always ensure package installation
(setq use-package-always-ensure t)
;; ---------------------------------- Unicode ----------------------------------
;; unicode all the things
(set-locale-environment "en_US.UTF-8")
(prefer-coding-system 'utf-8)
(set-default-coding-systems 'utf-8)
(set-terminal-coding-system 'utf-8)
(set-keyboard-coding-system 'utf-8)
(set-selection-coding-system 'utf-8)
(setq locale-coding-system 'utf-8)
(set-charset-priority 'unicode)
(setq x-select-request-type
'(UTF8_STRING COMPOUND_TEXT TEXT STRING))
;; ---------------------------- Inhibit UI Elements ----------------------------
;; setting UI preferences here before the UI is displayed
(push '(menu-bar-lines . 0) default-frame-alist)
(push '(tool-bar-lines . 0) default-frame-alist)
(push '(vertical-scroll-bars) default-frame-alist)
(setq-default inhibit-startup-screen t)
(setq-default inhibit-startup-message t)
(setq-default inhibit-splash-screen t)
(setq-default initial-scratch-message nil)
(setq inhibit-startup-echo-area-message t)
(provide 'early-init)
;;; early-init.el ends here.