Script Editor – reading setting and toggling the language setting from JS

Macro Library
1

Code samples (a function and a language toggling test to illustrate its use) for JavaScript for Automation actions.

(There was some suggestion earlier today that until Dan’s excellent Atom+Debugging script the reading or resetting of the active language in Script Editor documents had been a little obscure).

(function () {
    'use strict';

    // Returns the language of the supplied Script Editor Document
    // If there is a third argument, then the language may be reset.
    // Any string in the 3rd argument is interpreted as 'JavaScript' 
    // if it contains a 'j' or 'J', and as 'AppleScript' otherwise

    // The first and 3rd arguments may have the value `undefined`


    // scriptEditorDocLanguage :: Maybe Application (SE) ->  
    //        Document -> Maybe String -> Language
    function scriptEditorDocLanguage(appSE, oDoc, maybeStrNewLang) {
    
        // Reference to running Script Editor app ? (supplied or created afresh)
        var se = appSE || Application('Script Editor');

        // Current language and its name string ?
        var oLang = oDoc.language(),
            strLang = oLang.name(),

            // Name of new language ? (or existing if no specified change)
            strNewLang = maybeStrNewLang ? (
                maybeStrNewLang.toLowerCase()
                .indexOf('j') !== -1 ? 'JavaScript' : 'AppleScript'
            ) : strLang;


        // New language object (possibly updated) ?
        return strLang !== strNewLang ? (
            oDoc.language = se.languages.byName(
                strNewLang
            ),
            oDoc.language()
        ) : oLang;
    }

    // TOGGLE TEST - REQUIRES A SECOND SCRIPT EDITOR DOC TO BE OPEN

    var se = Application('Script Editor');

    // Toggle the language setting of the second Script Editor document
    // (not this one :-) 
    if (se.documents.length > 1) {
        var docSecond = se.documents[1];

        return scriptEditorDocLanguage(
            se,
            docSecond,
            (
                scriptEditorDocLanguage(se, docSecond)
                .name()
                .toLowerCase()
                .indexOf('j') !== -1 ? 'as' : 'js'
            )
        );


    } else {
        return 'Only one Script Editor document found';
    }

})();
2

If you have trouble, like me, understanding and using the above script, you may want to look at the below for a simple example: