Slow Glass supports a number of system commands. Typically you won’t need these but they may be useful for debugging or for advanced use.

Console Messages

(log | print) {text}...

The text is written to the JavaScript console.

This command completes immediately.

Finish

Finish

Rather abruptly just stop the app.

No further completion events happen.

Get

get {variable-name} from {URL}

The value of the given variable name will be set to the content returned by the HTTP GET method of the given URL, or to NONE if the URL is not available. Each line of the content will be placed into an array member of the variable, with the key being a numeric line number.

For example, this could be used to query a Raspberry Pi equipped with sensors to get information such as the current temperature.

RSS Get

rssget {variable-name} from {URL} [item {number}]

Creates an array variable with the given name, populated with the following fields (array names): “description”, “title”, “link”, “date” from the given RSS feed.

Important note: either use CORS enabled RSS feeds or set your own CORS proxy in defaults.js or by setting the “corsproxy” option from the web page.

Future Intentions

I’d like to add the following commands:

post [to] {URL} {variable-name}...

Generates a POST command to the given URL where the form content is of the form:

variable-name: variable-value

and so on, for each given variable name

The intention of this command is to pass requests to external services, for example I’d like to set up a web service on a Raspberry PI to flash some LEDs or run some motors to accompany the animation.

This command completes immediately.

send [to] {URL} {text}...