processing-3-mode

A minimalist major mode for Processing 3, leveraging the p3 command line tools. It provides convenient access to compiler features and some basic development niceties, such as p3-aware keyword font locking.

Installation

The mode requires Processing 3 with CLI tools enabled. For more information on those, read the official documentation.

Until the package is published on melpa, I recommend using straight.el.

If you want p3-mode to automatically start when opening .pde files, add the following snippet to your init file.

(add-to-list 'auto-mode-alist '("\\.pde$" . p3-mode))

Customization

You can enable any of the flags supported by processing-java.

Flag	Values
processing-3-no-java	nil (default), t
processing-3-force	nil (default), t
processing-3-platform	nil (default), 'linux, 'macosx, 'windows
processing-3-compile-key	'run (default), 'build, 'present, 'export
processing-3-args	"" (default), any string

processing-3-args is a string used to add command-line arguments when calling processing-java. As this is most likely file-dependent, it can be useful to add these using buffer local variables. Below is an example using the block quote syntax.

/* Local Variables:                   */
/* mode: processing-3                 */
/* processing-3-args: "300 400"       */
/* End:                               */

void setup() {

// etc

Keymap

The following keybindings are provided out of the box.

Function	Keymap
run	C-c C-r
build	C-c C-b
present	C-c C-p
export	C-c C-e
compile-cmd	C-c C-c

compile-cmd (C-c C-c) is meant as a convenience bind to whatever build function you use the most. It is controlled by processing-3-compile-cmd and defaults to 'run.

Limitations

• Unlike ptrv’s processing-mode, processing-3-mode does not currently come with Company support nor snippets.
• It is not a fork off, or comparable with, ptrv’s richer processing2-mode.
• The mode does not explicitly interact with Processing’s sketchbook, which means you can run .pde files freely on the file system, pre-supposing that you follow their limitations (a sketch has to have a valid file name, mirrored in its dir).
• There is currently no way to install libraries from the cli tool, and thus no way to do that from within Emacs.
• Outputting to a directory other than the current one is not supported.
• There is only support for running Processing in Java mode (I could make it a minor mode for processeing-mode comparability, if that would be of use to anyone, open an issue!).