However, I cannot find how to add Processing syntax highlighting and completion
QuoteHowever, I cannot find how to add Processing syntax highlighting and completionAre you in the habit of asking Arduino questions on the Processing forum, too? What exactly is your Arduino issue?
Depending upon your version of BBEdit the following should be used as a rough guide.BBEdit->PreferencesSelect "Languages" from the list on the left.Click the '+' under the "Custom Extension Mappings" pane.Select the "Suffix" side of the new entry and enter extension used by your version the Arduino IDE.Click on the "Languages" side and select "C++" form the pop-up menu.You should be good to go!
Processing is the language Arduino is using, is it not?
QuoteProcessing is the language Arduino is using, is it not?No. The Arduino IDE is based on the Processing IDE. Processing (the language) is Java, the Arduino language is C/C++.