330 lines
14 KiB
EmacsLisp
330 lines
14 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: 1.1.2
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;; SPDX-License-Identifier: GPL-3.0-or-later
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;;; Commentary:
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;; The minimal-emacs.d project is a customizable base that provides better Emacs
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;; defaults and optimized startup, intended to serve as a solid foundation for
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;; your vanilla Emacs configuration.
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;;; Code:
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;;; Variables
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(defvar minimal-emacs-ui-features '()
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"List of user interface features to disable in minimal Emacs setup.
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This variable holds a list Emacs UI features that can be enabled:
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- `context-menu`: Enables the context menu in graphical environments.
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- `tool-bar`: Enables the tool bar in graphical environments.
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- `menu-bar`: Enables the menu bar in graphical environments.
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- `dialogs`: Enables both file dialogs and dialog boxes.
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- `tooltips`: Enables tooltips.
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Each feature in the list corresponds to a specific UI component that can be
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turned on.")
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(defvar minimal-emacs-frame-title-format "%b – Emacs"
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"Template for displaying the title bar of visible and iconified frame.")
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(defvar minimal-emacs-debug nil
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"Non-nil to enable debug.")
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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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(defvar minimal-emacs-package-initialize-and-refresh t
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"Whether to automatically initialize and refresh packages.
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When set to non-nil, Emacs will automatically call `package-initialize' and
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`package-refresh-contents' to set up and update the package system.")
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(defvar minimal-emacs-inhibit-redisplay-during-startup nil
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"Suppress redisplay during startup to improve performance.
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This prevents visual updates while Emacs initializes, leading to a cleaner and
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faster startup. The tradeoff is that you won't see the progress or activities
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during the startup process.")
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(defvar minimal-emacs-inhibit-message-during-startup nil
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"Suppress startup messages for a cleaner experience.
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By disabling startup messages, this slightly enhances performance and provides a
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cleaner startup. The tradeoff is that you won't be informed of the progress or
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any relevant activities during startup.")
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(defvar minimal-emacs-disable-mode-line-during-startup nil
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"Disable the mode line during startup to improve performance.
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This reduces visual clutter and slightly enhances startup performance. The
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tradeoff is that the mode line is hidden during the startup phase, giving a more
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minimalistic appearance during startup.")
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(defvar minimal-emacs-user-directory user-emacs-directory
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"The default value of the `user-emacs-directory' variable.")
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;;; Load pre-early-init.el
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;; Prefer loading newer compiled files
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(setq load-prefer-newer t)
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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-user-directory)))
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(when (file-exists-p user-init-file)
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(load user-init-file nil t t))))
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(minimal-emacs-load-user-init "pre-early-init.el")
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(setq custom-theme-directory
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(expand-file-name "themes/" minimal-emacs-user-directory))
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(setq custom-file (expand-file-name "custom.el" minimal-emacs-user-directory))
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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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(setq gc-cons-threshold most-positive-fixnum)
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(defun minimal-emacs--restore-gc-cons-threshold ()
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"Restore `minimal-emacs-gc-cons-threshold'."
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(setq gc-cons-threshold minimal-emacs-gc-cons-threshold))
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(add-hook 'emacs-startup-hook #'minimal-emacs--restore-gc-cons-threshold 105)
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;;; Misc
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(set-language-environment "UTF-8")
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;; Set-language-environment sets default-input-method, which is unwanted.
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(setq default-input-method nil)
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;;; Performance
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;; Font compacting can be very resource-intensive, especially when rendering
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;; icon fonts on Windows. This will increase memory usage.
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(setq inhibit-compacting-font-caches t)
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(unless (daemonp)
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(let ((old-value (default-toplevel-value 'file-name-handler-alist)))
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;; Determine the state of bundled libraries using calc-loaddefs.el.
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;; If compressed, retain the gzip handler in `file-name-handler-alist`.
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;; If compiled or neither, omit the gzip handler during startup for
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;; improved startup and package load time.
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(set-default-toplevel-value 'file-name-handler-alist
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(if (eval-when-compile
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(locate-file-internal "calc-loaddefs.el"
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load-path))
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nil
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(list (rassq 'jka-compr-handler old-value))))
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;; Ensure the new value persists through any current let-binding.
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(put 'file-name-handler-alist 'initial-value old-value)
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;; Emacs processes command-line files very early in startup. These files may
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;; include special paths like TRAMP paths, so restore
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;; `file-name-handler-alist' for this stage of initialization.
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(define-advice command-line-1 (:around (fn args-left) respect-file-handlers)
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(let ((file-name-handler-alist
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(if args-left old-value file-name-handler-alist)))
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(funcall fn args-left)))
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;; Restore the old value to reset it as needed.
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(defun minimal-emacs--restore-file-name-handler-alist ()
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"Restore `file-name-handler-alist'."
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(set-default-toplevel-value
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'file-name-handler-alist
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;; Merge instead of overwrite to preserve any changes made since startup.
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(delete-dups (append file-name-handler-alist old-value))))
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(add-hook
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'emacs-startup-hook #'minimal-emacs--restore-file-name-handler-alist 101))
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(unless noninteractive
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(unless minimal-emacs-debug
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(when minimal-emacs-inhibit-redisplay-during-startup
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;; Suppress redisplay and redraw during startup to avoid delays and
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;; prevent flashing an unstyled Emacs frame.
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(defun minimal-emacs--reset-inhibit-redisplay ()
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(setq-default inhibit-redisplay nil)
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(remove-hook 'post-command-hook #'minimal-emacs--reset-inhibit-redisplay))
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(setq-default inhibit-redisplay t)
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(add-hook 'post-command-hook #'minimal-emacs--reset-inhibit-redisplay -100))
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(when minimal-emacs-inhibit-message-during-startup
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(defun minimal-emacs--reset-inhibit-message ()
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(setq-default inhibit-message nil)
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(remove-hook 'post-command-hook #'minimal-emacs--reset-inhibit-message))
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(setq-default inhibit-message t)
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(add-hook 'post-command-hook #'minimal-emacs--reset-inhibit-message -100))
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(put 'mode-line-format
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'initial-value (default-toplevel-value 'mode-line-format))
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(when minimal-emacs-disable-mode-line-during-startup
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(setq-default mode-line-format nil)
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(dolist (buf (buffer-list))
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(with-current-buffer buf
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(setq mode-line-format nil))))
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(defun minimal-emacs--startup-load-user-init-file (fn &rest args)
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"Advice for startup--load-user-init-file to reset mode-line-format."
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(unwind-protect
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;; Start up as normal
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(apply fn args)
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;; If we don't undo inhibit-{message, redisplay} and there's an
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;; error, we'll see nothing but a blank Emacs frame.
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(when minimal-emacs-inhibit-message-during-startup
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(setq-default inhibit-message nil))
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(when minimal-emacs-inhibit-redisplay-during-startup
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(setq-default inhibit-redisplay nil))
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;; Restore the mode-line
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(when minimal-emacs-disable-mode-line-during-startup
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(unless (default-toplevel-value 'mode-line-format)
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(setq-default mode-line-format (get 'mode-line-format
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'initial-value))))))
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(advice-add 'startup--load-user-init-file :around
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#'minimal-emacs--startup-load-user-init-file))
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;; Without this, Emacs will try to resize itself to a specific column size
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(setq frame-inhibit-implied-resize t)
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;; A second, case-insensitive pass over `auto-mode-alist' is time wasted.
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;; No second pass of case-insensitive search over auto-mode-alist.
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(setq auto-mode-case-fold nil)
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;; Reduce *Message* noise at startup. An empty scratch buffer (or the
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;; dashboard) is more than enough, and faster to display.
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(setq inhibit-startup-screen t
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inhibit-startup-echo-area-message user-login-name)
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(setq initial-buffer-choice nil
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inhibit-startup-buffer-menu t
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inhibit-x-resources t)
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;; Disable bidirectional text scanning for a modest performance boost.
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(setq-default bidi-display-reordering 'left-to-right
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bidi-paragraph-direction 'left-to-right)
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;; Give up some bidirectional functionality for slightly faster re-display.
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(setq bidi-inhibit-bpa t)
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;; Remove "For information about GNU Emacs..." message at startup
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(advice-add #'display-startup-echo-area-message :override #'ignore)
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;; Suppress the vanilla startup screen completely. We've disabled it with
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;; `inhibit-startup-screen', but it would still initialize anyway.
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(advice-add #'display-startup-screen :override #'ignore)
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;; Shave seconds off startup time by starting the scratch buffer in
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;; `fundamental-mode'
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(setq initial-major-mode 'fundamental-mode
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initial-scratch-message nil)
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(unless minimal-emacs-debug
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;; Unset command line options irrelevant to the current OS. These options
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;; are still processed by `command-line-1` but have no effect.
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(unless (eq system-type 'darwin)
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(setq command-line-ns-option-alist nil))
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(unless (memq initial-window-system '(x pgtk))
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(setq command-line-x-option-alist nil)))))
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;;; Native compilation and Byte compilation
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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-jit-compilation t
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native-comp-deferred-compilation t ; Obsolete since Emacs 29.1
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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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;; Suppress compiler warnings and don't inundate users with their popups.
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(setq native-comp-async-report-warnings-errors
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(or minimal-emacs-debug 'silent))
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(setq native-comp-warning-on-missing-source minimal-emacs-debug)
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(setq debug-on-error minimal-emacs-debug
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jka-compr-verbose minimal-emacs-debug)
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(setq byte-compile-warnings minimal-emacs-debug)
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(setq byte-compile-verbose minimal-emacs-debug)
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;;; UI elements
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(setq frame-title-format minimal-emacs-frame-title-format
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icon-title-format minimal-emacs-frame-title-format)
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;; Disable startup screens and messages
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(setq inhibit-splash-screen t)
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;; I intentionally avoid calling `menu-bar-mode', `tool-bar-mode', and
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;; `scroll-bar-mode' because manipulating frame parameters can trigger or queue
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;; a superfluous and potentially expensive frame redraw at startup, depending
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;; on the window system. The variables must also be set to `nil' so users don't
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;; have to call the functions twice to re-enable them.
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(unless (memq 'menu-bar minimal-emacs-ui-features)
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(push '(menu-bar-lines . 0) default-frame-alist)
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(unless (memq window-system '(mac ns))
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(setq menu-bar-mode nil)))
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(unless (daemonp)
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(unless noninteractive
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(when (fboundp 'tool-bar-setup)
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;; Temporarily override the tool-bar-setup function to prevent it from
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;; running during the initial stages of startup
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(advice-add #'tool-bar-setup :override #'ignore)
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(define-advice startup--load-user-init-file
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(:after (&rest _) minimal-emacs-setup-toolbar)
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(advice-remove #'tool-bar-setup #'ignore)
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(when tool-bar-mode
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(tool-bar-setup))))))
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(unless (memq 'tool-bar minimal-emacs-ui-features)
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(push '(tool-bar-lines . 0) default-frame-alist)
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(setq tool-bar-mode nil))
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(push '(vertical-scroll-bars) default-frame-alist)
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(push '(horizontal-scroll-bars) default-frame-alist)
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(setq scroll-bar-mode nil)
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(unless (memq 'tooltips minimal-emacs-ui-features)
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(when (bound-and-true-p tooltip-mode)
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(tooltip-mode -1)))
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;; Disable GUIs because they are inconsistent across systems, desktop
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;; environments, and themes, and they don't match the look of Emacs.
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(unless (memq 'dialogs minimal-emacs-ui-features)
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(setq use-file-dialog nil)
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(setq use-dialog-box nil))
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;;; package.el
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(setq use-package-compute-statistics minimal-emacs-debug)
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;; Setting use-package-expand-minimally to (t) results in a more compact output
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;; that emphasizes performance over clarity.
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(setq use-package-expand-minimally (not noninteractive))
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(setq use-package-minimum-reported-time (if minimal-emacs-debug 0 0.1))
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(setq use-package-verbose minimal-emacs-debug)
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(setq package-enable-at-startup nil) ; Let the init.el file handle this
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(setq use-package-always-ensure t)
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(setq use-package-enable-imenu-support t)
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(setq package-archives '(("melpa" . "https://melpa.org/packages/")
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("melpa-stable" . "https://stable.melpa.org/packages/")
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("gnu" . "https://elpa.gnu.org/packages/")
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("nongnu" . "https://elpa.nongnu.org/nongnu/")))
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(customize-set-variable 'package-archive-priorities '(("gnu" . 99)
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("nongnu" . 80)
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("stable" . 70)
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("melpa" . 0)))
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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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