Alda Mode 
The best way to edit your alda files in Emacs!
Alda mode is a simple mode to provide syntax highlighting and other basic language features for Alda, the music programming language written in Clojure.
Installation
The easiest way to install alda-mode is through melpa. Simply
M-x package-install alda-mode.
Once installed, place (require 'alda-mode) in your init.el.
For evil integration, simply install evil before alda-mode.
Alda files (.alda extension) should now have syntax highlighting via
font-lock-mode when opened.
If melpa won’t work for you, M-x package-install-file alda-mode.el
from this repository instead.
Alda Playback
alda-mode can play segments of alda from within Emacs! Simply highlight a section of alda code and run:
M-x alda-play-region
This will take a while during the first call, which will start the alda server
within Emacs (if not already on your system). alda will need to be on your
path.
Many other commands are available too, to allow playing an entire buffer, a file, or more!
Please submit any bugs with this feature as issues to this repository.
Alda History
When playing a region, sometimes you need ‘context’ for the playback. In alda,
this is provided as ‘history’ through the java client, through alda play
--history.
midi-square-wave:
o2 c8 d e f g a b > c
c < b a g f e d c
If you select and play the notes, without the midi-square-wave: header, you
will not hear any sound, as you have not selected an instrument. While you are
composing, you probably don’t want to select the entire score every time, so
what you can do is add parts of the score you depend on to history!
midi-square-wave: # Highlight, and run 'alda-history-append-region'
o2 c8 d e f g a b > c
# now you can debug the notes on this line, without waiting for the line above
c < b a g f e d c
If you wish to clear your history and return to a blank slate, run
alda-history-clear. This can be useful for debugging issues in alda-mode,
and can speed up alda execution if you added a lot to the history.
In previous releases, when the history was included in alda by default, history
was applied for every command. This is not supported in alda-mode yet, but if
you are interested, let me know!
Custom Alda Binary
If you want to use a custom alda binary, set alda-binary-location to
your alda binary. Ex:
(setq alda-binary-location "/usr/local/bin/alda")
Keep in mind, the server will only see the selection you make, and this
has consequences. For example, you must run a snippet of code defining
an instrument before you hear anything (or defining a marker before
using it). alda-play-region will use a running alda server if it finds
one, but will start one within Emacs if not found. Support is currently
only tested under Linux for this command. Mac will probably work depending
on your emacs install.
Evil Integration
Evil integration is automatically applied if you install evil before alda-mode. If you are installing evil after alda-mode, please reinstall/recompile alda-mode.
(package-install 'evil)
(package-install 'alda-mode)
(require 'alda-mode)This will make a evil operator called alda-evil-play-region, defined
when you require evil. If evil was not installed, this is replaced with
a warning message.
Keybindings
alda-mode adds a couple simple keybindings by default. These are documented below:
| Keybind | Function | Explanation |
|---|---|---|
C-c C-r | alda-play-region | Plays selected text |
C-c C-c | alda-play-block | Plays the paragraph on point |
C-c C-n | alda-play-line | Plays a single line |
C-c C-b | alda-play-buffer | Plays the entire buffer, as text (not as a file) |
Here are some simple example keybinds for evil integration (or if you want to add your own custom keybindings):
(global-set-key (kbd "C-c a") 'alda-play-region) ;; Global alda-play-map
;; Requires evil integration
(define-key evil-motion-state-map "gp" 'alda-evil-play-region)This will map C-c a to play a selected region, and gp to be an evil
operator to do the same thing! (gpp will play the current line,
gp20j plays 20 lines, etc).
Contributing
If you find a bug or want to improve alda-mode, submit a PR or file an issue! =)
License
alda-mode is licensed under the GPLv3.