How do I byte-compile everything in my .emacs.d directory?

Question

I have decided to check out Emacs, and I liked it very much. Now, I'm using the Emacs Starter Kit, which sort of provides better defaults and some nice customizations to default install of Emacs.

I have customized it a little, added some stuff like yasnippet, color-themes, unbound, and other stuff. I've set up a github repository where I keep all of the customizations so I can access them from multiple places or in case something goes bad and I lose my .emacs.d directory.

All of this is very nice, but there is a problem: Emacs takes about 1-2 seconds to load. AFAIK I can compile individual .el files with M-x byte-compile-file to .elc, and it works. But there are a lot of .el files, and I wonder if there is a way to compile them all with a simple command or something, to speed up the loading of Emacs. My Emacs is not always open, and I open and close it quite frequently, especially after I've set it up as a default editor for edit command in Total Commander to get used to it faster (yeah, windows xp here).

My Emacs version is 22.3. And yes, the default Emacs installation without any customizations fires up instantly.

I am not sure which version is preferred when loading, the .el or compiled .elc one by the way O.o

So, is there an elisp command or Emacs command line switch to make Emacs byte-compile everything in .emacs.d directory?

Regulus

Answer 1

C-u 0 M-x byte-recompile-directory

will compile all the .el files in the directory and in all subdirectories below.

The C-u 0 part is to make it not ask about every .el file that does not have a .elc counterpart.

Mcreynolds

And thereafter (once each has been compiled once), just use the same command without the C-u 0 (aka C-0, BTW). That will byte-compile only those source files that are more recent than their byte-compiled versions. – Leucine

A little note: for me that didn't worked until I removed all an according «.elc» files. It just told something like «Done, 0 files comiled, α files skipped». – Enure

@Enure I have the same problem. Have you found any solution? – Ablution

@Ablution yep. Unfortunately the command compiles only files that either have changed, or have no «.elc» counterpart. So to recompile everything in a directory first you have to delete all «.elc» files. – Enure

The interactive command unfortunately doesn't expose it, but if you call the function directly you can use the optional argument FORCE to recompile files that already have an associated ".elc" even if they're not older than the source file: M-: (byte-recompile-directory "/the/directory/" 0 t) – Hunley

You can also use the byte-force-recompile command to get the FORCE option. – Garman

Answer 2

To automatically byte compile everything that needs byte compiling each time I start emacs, I put the following after my changes to load-path at the top of my .emacs file:

(byte-recompile-directory (expand-file-name "~/.emacs.d") 0)

Surprisingly, it doesn't add much to my startup time (unless something needs to be compiled).

To speed up my emacs, I first identified the slow parts using profile-dotemacs.el and then replaced them with autoloads.

Striptease

autoloads documentation has moved. That and the profile-dotemacs.el reference are exactly what I needed when I came across this page. – Monney

Answer 3

You can use the --batch flag to recompile from the command line.

To recompile all, do

emacs --batch --eval '(byte-recompile-directory "~/.emacs.d")'

or to recompile a single file as from a Makefile,

emacs --batch --eval '(byte-compile-file "your-elisp-file.el")'

Stylet

use batch-byte-compile instead. – Kiosk

Could you should how to use it? – Hypochondrium

@Hypochondrium emacs -Q --batch -f batch-byte-compile *.el foo/*.el - it doesn't recurse like byte-recompile-directory does though. – Julietajulietta

You probably want to add an argument to force recompilation, eg. emacs --batch --eval '(byte-recompile-directory "~/.emacs.d" 0)' – Lucas

Answer 4

This is swaying a bit from the question, but to solve the problem of loading slowly you can use the new daemon feature in Emacs 23.

"If you have a lot of support packages, emacs startup can be a bit slow. However, emacs 23 brings emacs --daemon, which enables you to start emacs in the background (for example when you log in). You can instantly pop up new emacs windows (frames) with emacsclient. Of course, you could already have an emacs 'server' in older versions, but being able to start it in the background makes this a much nicer solution"

From http://emacs-fu.blogspot.com/2009/07/emacs-23-is-very-near.html

Anther

I definitely gonna check this one one out. Thank you! – Regulus

If you add alias emacs='emacsclient -nw -a "" -c' to your .bashrc (or your shell's version) it will first try to connect to a running daemon if there is one, if not it will start one and connect you. – Flory

Answer 5

The command I use is M-x byte-force-recompile RET, it then asks the directory so, for example, I give it ~/.emacs.d/elpa/. It then recompiles everything in there, usually no need to delete .elc files first or mess with it in other ways.

Resurrect

Answer 6

For my using spacemacs, the command is spacemacs/recompile-elpa. The command byte-recompile-directory does not compile any file.

Deniable

Different things. ELPA/MELPA stuff has defined build methods in its own archive hierarchy. byte-recompile-directory tries to compile all .el files in a user defined directory. – Lillalillard