code.h(oe)kje

The standard instructions for swank-clojure (the clojure backend to SLIME) imply you always use the same binary and/or classpath for starting your clojure code. The problem with that is that for different projects you generally want to specify at least additional classpaths and possibly even a completely different clojure version.

At the same time, most projects already contain some kind of startup/REPL script, so why not use that? swank-clojure only really needs some code that starts a repl and has the swank-clojure code in its classpath.

Below is my emacs code to do just that. Just put it somewhere in your emacs init scripts, type M-x clojure and select your startup script and away you go. The following is all my clojure-specific code, but the really "interesting" bit is the (defun clojure ...) bit.

;; this is needed because swank-clojure complains if you don't have any
;; value for this variable. When you use the clojure command it'll override
;; this value
(setq swank-clojure-binary "clj")

(require 'clojure-mode)
(require 'swank-clojure-autoload)
(require 'swank-clojure)
(require 'slime)

(add-hook 'clojure-mode-hook 'slime-mode)

(add-hook 'clojure-mode-hook 'start-paredit)

(slime-setup
 '(slime-fancy ;; turns on fancy inspector, autodoc and other useful stuff
   slime-highlight-edits)) 

(defun clojure (binary)
  (interactive "fbinary: ")
  (setq swank-clojure-binary (or binary "clj"))
  (setq slime-lisp-implementations
        `((clojure (,swank-clojure-binary) :init swank-clojure-init)))
  (slime))

My complete emacs init stuff is at http://github.com/joodie/emacs-d

Oh, before I forget: the code above does assume that you're only using SLIME with clojure and not also with other lisps. If you do need that functionality, you can probably figure out how to make it work.

Flash finally raised my curiousity by adding fully programmable audio in Flash player 10. This means you can read the currently playing audio stream to provide reasonably accurate VU meters etc, but more interesting, it means you can write your own audio-generating algorithms.

To test if flash is actually fast enough and to see if it's really possible to write flash apps using nothing but the free mxmlc compiler and emacs, I wrote a simple synthesizer in flash 10. The result is fairly pleasing.

Check it out!

I just updated emacs-rails so that feedback on the currently running test is put in the global modeline. This means you get that feedback in all buffers, so you can work on something else while your tests are running, and the minibuffer stays free for useful things.

It's started automatically when emacs-rails is loaded, but that's customizable of course, and you can switch it on and off using rails-ui:enable-mode-line / rails-ui:disable-mode-line.

Get it at http://github.com/remvee/emacs-rails/tree/master

Here are the commit details

Update: actually, the head has some nicely cleaned up code now. So just get that at http://github.com/remvee/emacs-rails/tree/master

One of the projects I'm working on is in Ruby on Rails, and I'm using emacs-rails (with some small tweaks) as the development environment.

Emacs rails works fine, except for one thing: the navigation menus (x-popup-menus) are awkward when you want to use the keyboard. So I thought I'd switch on the rails-always-use-text-menus option. Which didn't actually work, but I fixed that bit.

Rails-always-use-text-menus uses tmm-prompt, which is the standard function on emacs to mimic drop-down menus on the console. and it's almost as horrible as x-popup-menu: if the items in the menu aren't static you can't predict the which key activates which item, and it takes up a lot of screen space:

Which key can I press to go to the UserPreference model?

I really like iswitch buffers for buffer navigation, and it seemed to me that it should be possible to navigate the menus using the same technique, even for nested menus.

So here is iswitch-menu, a direct replacement for tmm-prompt and/or x-popup-menu. It's not quite finished yet - I'm working out the last issues with some of the more "interesting" constructs used by the menubar keymap - but it's more than adequate for use with emacs-rails, at least.

Now, I can just type some substring of the name of the model, and go there

First character typed, we can see which models still match

Second character typed, only one model still matches.

Pressing TAB completes the typed text, and goes to the selected model if there's only one. Pressing ENTER opens the first matched model. See also the iswitchb documentation for available tweaks and key bindings.

Get iswitch-menu at github

For a mod_perl project I'm working on I wanted a way to track the apache error log and jump to the source of the errors from emacs.

Fortunately, emacs' (compile) command makes this very easy:

;; restarts apache and track the error log
(defun apache-restart-and-tail ()
      (interactive)
      (compile "sudo /etc/init.d/httpd restart && sudo tail -f /var/log/httpd/error_log"))

;; key binding
(global-set-key (kbd "<C-kp-enter>") 'apache-restart-and-compile)