optimize and measure emacs startup time, saner indentation for org src blocks

[~bandali/configs] / emacs / init.org

#+title: =aminb='s Emacs Init file
#+property: header-args :results silent :comments link :tangle ~/dotfiles/emacs/init.el

* Intro

TODO: description

TODO: toc

* Header

** First line

#+begin_src emacs-lisp :comments none
;;; init.el --- Amin Bandali's Emacs config -*- lexical-binding: t ; eval: (view-mode 1)-*-
#+end_src

Enable =view-mode=, which both makes the file read-only (as a reminder
that =init.el= is an auto-generated file, not supposed to be edited),
and provides some convenient key bindings for browsing through the
file.

** License

#+begin_src emacs-lisp :comments none
;; Copyright (C) 2018  Amin Bandali <amin@aminb.org>

;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
#+end_src

** Commentary

#+begin_src emacs-lisp :comments none
;;; Commentary:

;; Emacs configuration of Amin Bandali, computer scientist and functional
;; programmer.

;; THIS FILE IS AUTO-GENERATED FROM `init.org'.
#+end_src

* Config

#+begin_src emacs-lisp :comments none
;;; Code:
#+end_src

** Org

#+begin_src emacs-lisp
(setq org-src-tab-acts-natively t
      org-src-preserve-indentation nil
      org-edit-src-content-indentation 0)
#+end_src

** Startup time

Measure and display startup time. Also, temporarily increase
~gc-cons-threshhold~ during startup to reduce reduce garbage
collection frequency. Taken from [[https://github.com/dieggsy/dotfiles/tree/3d95bc08033920e077855caf545a975eba52d28d/emacs.d#startup-time][here]].

#+begin_src emacs-lisp
(defconst aminb/emacs-start-time (current-time))
(defconst aminb/gc-cons-threshold gc-cons-threshold)
(defconst aminb/gc-cons-percentage gc-cons-percentage)
(defvar aminb/file-name-handler-alist file-name-handler-alist)
(setq gc-cons-threshold 400000000
      gc-cons-percentage 0.6
      file-name-handler-alist nil
      ;; sidesteps a bug when profiling with esup
      esup-child-profile-require-level 0)
#+end_src

Reset the variables back to default after init.

#+begin_src emacs-lisp
(add-hook
 'after-init-hook
 `(lambda ()
    (setq gc-cons-threshold aminb/gc-cons-threshold
          gc-cons-percentage aminb/gc-cons-percentage
          file-name-handler-alist aminb/file-name-handler-alist)
    (let ((elapsed (float-time (time-subtract (current-time)
                                              aminb/emacs-start-time))))
      (message "Loading %s...done (%.3fs) [after-init]"
               ,load-file-name elapsed))))
#+end_src

* Footer

#+begin_src emacs-lisp :comments none
;;; init.el ends here
#+end_src