140 lines
4.8 KiB
EmacsLisp
140 lines
4.8 KiB
EmacsLisp
;;; early-init.el --- Early Init -*- no-byte-compile: t; lexical-binding: t; -*-
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;; Author: James Cherti
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;; URL: https://github.com/jamescherti/minimal-emacs.d
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;; Package-Requires: ((emacs "29.1"))
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;; Keywords: maint
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;; Version: 1
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;; SPDX-License-Identifier: GPL-3.0-or-later
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;;; Commentary:
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;; This file contains early initialization settings for Emacs. It is designed
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;; to optimize the startup process and configure essential settings before the
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;; main initialization.
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;;; Code:
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;;; Load pre-early-init.el
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(defvar minimal-emacs--default-user-emacs-directory user-emacs-directory
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"The default value of the `user-emacs-directory' variable.")
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(defun minimal-emacs-load-user-init (filename)
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"Execute a file of Lisp code named FILENAME."
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(let ((user-init-file
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(expand-file-name filename
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minimal-emacs--default-user-emacs-directory)))
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(when (file-exists-p user-init-file)
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(load user-init-file))))
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(minimal-emacs-load-user-init "pre-early-init.el")
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;;; Variables
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(defvar minimal-emacs-gc-cons-threshold (* 16 1024 1024)
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"The value of `gc-cons-threshold' after Emacs startup.")
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;;; Garbage collection
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;; Garbage collection significantly affects startup times. This setting delays
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;; garbage collection during startup but will be reset later.
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(defvar minimal-emacs-default-gc-cons-threshold gc-cons-threshold
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"The default value of `gc-cons-threshold'.")
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(setq gc-cons-threshold most-positive-fixnum)
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(add-hook 'emacs-startup-hook (lambda ()
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(setq gc-cons-threshold (* 16 1024 1024))))
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;;; file-name-handler-alist
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;; During startup, Emacs will process every opened and loaded file through this
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;; list to identify a suitable handler. However, at that point, it won't
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;; require any of them.
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(defvar minimal-emacs--default-file-name-handler-alist file-name-handler-alist
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"The default value of the `file-name-handler-alist' variable.")
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(setq file-name-handler-alist nil)
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(defun minimal-emacs--restore-file-name-handler-alist ()
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"Restore the variables that were modified by `early-init.el'."
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(setq file-name-handler-alist minimal-emacs--default-file-name-handler-alist))
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(add-hook 'emacs-startup-hook #'minimal-emacs--restore-file-name-handler-alist)
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;; Byte comp
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(setq load-prefer-newer t) ; Prefer loading newer compiled files
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;; Native comp
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(defvar minimal-emacs-native-comp-reserved-cpus 2
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"Number of CPUs to reserve and not use for `native-compile'.")
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(defun minimal-emacs-calculate-native-comp-async-jobs ()
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"Set `native-comp-async-jobs-number' based on the available CPUs."
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;; The `num-processors' function is only available in Emacs >= 28.1
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(max 1 (- (num-processors) minimal-emacs-native-comp-reserved-cpus)))
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(if (and (featurep 'native-compile)
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(fboundp 'native-comp-available-p)
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(native-comp-available-p))
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;; Activate `native-compile'
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(setq native-comp-async-jobs-number
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(minimal-emacs-calculate-native-comp-async-jobs)
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native-comp-deferred-compilation t
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package-native-compile t)
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;; Deactivate the `native-compile' feature if it is not available
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(setq features (delq 'native-compile features)))
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;;; Simple UI
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;; Disable startup screens and messages
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(setq inhibit-startup-screen t)
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(setq initial-scratch-message nil)
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(setq inhibit-splash-screen t)
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;;; Disable unneeded UI elements
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(when (fboundp 'tooltip-mode)
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(tooltip-mode -1))
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(unless (memq window-system '(mac ns))
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(menu-bar-mode -1))
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(when (fboundp 'tool-bar-mode)
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(tool-bar-mode -1))
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(when (fboundp 'scroll-bar-mode)
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(scroll-bar-mode -1))
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(when (fboundp 'horizontal-scroll-bar-mode)
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(horizontal-scroll-bar-mode -1))
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;;; package: Set package archives for package installation
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(progn
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(require 'package)
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(setq package-enable-at-startup nil)
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(setq package-quickstart nil)
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(when (version< emacs-version "28")
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(add-to-list 'package-archives
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'("nongnu" . "https://elpa.nongnu.org/nongnu/")))
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(add-to-list 'package-archives
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'("stable" . "https://stable.melpa.org/packages/"))
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(add-to-list 'package-archives
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'("melpa" . "https://melpa.org/packages/"))
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(customize-set-variable 'package-archive-priorities
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'(("gnu" . 99)
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("nongnu" . 80)
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("stable" . 70)
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("melpa" . 0)))
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(when package-enable-at-startup
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(package-initialize)))
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;;; use-package:
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(progn
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;; Always ensure packages are installed
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(setq use-package-always-ensure t)
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;; Ensure the 'use-package' package is installed
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(unless (package-installed-p 'use-package)
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(package-install 'use-package))
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;; Load use-package for package configuration
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(eval-when-compile
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(require 'use-package)))
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;;; Load post-early-init.el
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(minimal-emacs-load-user-init "post-early-init.el")
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(provide 'early-init)
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;;; early-init.el ends here
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