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Updated meta-section to explain the self-destructing init.el.

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Lars Tveito 2015-04-08 00:13:52 +02:00
parent 0382f019b1
commit 1fd70a7018
1 changed files with 37 additions and 3 deletions
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40
init.org
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@ -44,9 +44,43 @@
* Configurations
** Meta
Emacs can only load =.el=-files. We can use =C-c C-v t= to run
=org-babel-tangle=, which extracts the code blocks from the current file
into a source-specific file (in this case a =.el=-file).
All changes to the configuration should be done in =init.org=, *not* in
=init.el=. Any changes in the =init.el= will be overwritten by saving
=init.org=. The =init.el= in this repo should not be tracked by git, and
is replaced the first time Emacs is started (assuming it has been renamed
to =~/.emacs.d=).
Emacs can't load =.org=-files directly, but =org-mode= provides functions
to extract the code blocks and write them to a file. There are multiple
ways of handling this; like suggested by [[http://emacs.stackexchange.com/questions/3143/can-i-use-org-mode-to-structure-my-emacs-or-other-el-configuration-file][this StackOverflow post]], one
could just use =org-babel-load-file=, but I had problems with
byte-compilation. Previously I tracked both the =org.=- and =el.=-files,
but the git commits got a little messy. So here is a new approach.
When this configuration is loaded for the first time, the ~init.el~ is
the file that is loaded. It looks like this:
#+BEGIN_SRC emacs-lisp :tangle no
;; This file replaces itself with the actual configuration at first run.
;; We can't tangle without org!
(require 'org)
;; Open the configuration
(find-file (concat user-emacs-directory "init.org"))
;; tangle it
(org-babel-tangle)
;; load it
(load-file (concat user-emacs-directory "init.el"))
;; finally byte-compile it
(byte-compile-file (concat user-emacs-directory "init.el"))
#+END_SRC
It tangles the org-file, so that this file is overwritten with the actual
configuration.
We can use =C-c C-v t= to run =org-babel-tangle=, which extracts the code
blocks from the current file into a source-specific file (in this case a
=.el=-file).
To avoid doing this each time a change is made we can add a function to
the =after-save-hook= ensuring to always tangle and byte-compile the