Creates an Adobe Illustrator action to export to SVG on-the-fly.

SVGExportAction.jsx

/*
 * This script creates an Adobe Illustrator action, on-the-fly, to export to SVG. The main thing to 
 * understand is that the `name` values in the action code are hexadecimal-encoded strings. The number
 * that immediately preceeds the encoded name are the length of the hex string divided by 2. 
 *
 * Usage:
 *
 *     Change the `basePath` variable to match your file system. This can be set to any folder you like.
 *
 * Credits:
 *
 *  Ascii-to-hex JS : https://www.w3resource.com/javascript-exercises/javascript-string-exercise-27.php
 *  Overall concept : https://github.com/Silly-V
 * 
 * @see https://community.adobe.com/t5/illustrator/creating-a-dynamic-action-to-use-with-app-doscript-method/td-p/8918373
 */
try {

    var actionScript = getActionScript();

    var basePath = '/Users/username/Downloads/';

    var ts = new Date().getTime();

    var setName = 'Custom--' + ts,
        setNameHex = asciiToHex(setName),
        setNameLen = setNameHex.length / 2;

    var actionName    = 'TestAction--' + ts,
        actionNameHex = asciiToHex(actionName),
        actionNameLen = actionNameHex.length / 2;

    var outputPath = basePath + actionName + '.svg',
        outputPathHex = asciiToHex( outputPath ),
        outputPathLen = outputPathHex.length / 2;

    actionScript = actionScript.replace( '{actionName}', actionNameHex);
    actionScript = actionScript.replace( '{actionNameLen}', actionNameLen );

    actionScript = actionScript.replace( '{outputPath}', outputPathHex );
    actionScript = actionScript.replace( '{outputPathLen}', outputPathLen );

    actionScript = actionScript.replace( '{setName}', setNameHex );
    actionScript = actionScript.replace( '{setNameLen}', setNameLen );

    createAction( basePath, actionScript, setName );
    app.doScript( actionName, setName );
    app.unloadAction( setName, '' );

}
catch(e) {alert(e)}

// =======================================================================
// FUNCTIONS
// =======================================================================

function getActionScript() {
    return "/version 3" +
        "/name [ {setNameLen}" +
        "	{setName}" +
        "]" +
        "/isOpen 1" +
        "/actionCount 1" +
        "/action-1 {" +
        "	/name [ {actionNameLen}" +
        "		{actionName}" +
        "	]" +
        "	/keyIndex 0" +
        "	/colorIndex 0" +
        "	/isOpen 0" +
        "	/eventCount 1" +
        "	/event-1 {" +
        "		/useRulersIn1stQuadrant 0" +
        "		/internalName (adobe_exportDocument)" +
        "		/localizedName [ 10" +
        "			54657374416374696f6e" +
        "		]" +
        "		/isOpen 1" +
        "		/isOn 1" +
        "		/hasDialog 1" +
        "		/showDialog 0" +
        "		/parameterCount 13" +
        "		/parameter-1 {" +
        "			/key 1349673843" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 24" +
        "				4149535647436f6f7264696e617465507265636973696f6e" +
        "			]" +
        "			/value 3" +
        "		}" +
        "		/parameter-2 {" +
        "			/key 1400132720" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 10" +
        "				41495356475374796c65" +
        "			]" +
        "			/value 1" +
        "		}" +
        "		/parameter-3 {" +
        "			/key 1380740963" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 19" +
        "				41495356475261737465724c6f636174696f6e" +
        "			]" +
        "			/value 1" +
        "		}" +
        "		/parameter-4 {" +
        "			/key 1179929460" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 13" +
        "				4149535647466f6e7454797065" +
        "			]" +
        "			/value 2" +
        "		}" +
        "		/parameter-5 {" +
        "			/key 1231311947" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 11" +
        "				4149535647496454797065" +
        "			]" +
        "			/value 1" +
        "		}" +
        "		/parameter-6 {" +
        "			/key 1835951737" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 11" +
        "				41495356474d696e696679" +
        "			]" +
        "			/value 1" +
        "		}" +
        "		/parameter-7 {" +
        "			/key 1919972214" +
        "			/showInPalette 4294967295" +
        "			/type (enumerated)" +
        "			/name [ 15" +
        "				4149535647526573706f6e73697665" +
        "			]" +
        "			/value 0" +
        "		}" +
        "		/parameter-8 {" +
        "			/key 1851878757" +
        "			/showInPalette 4294967295" +
        "			/type (ustring)" +
        "			/value [ {outputPathLen}" +
        "				{outputPath}" +
        "			]" +
        "		}" +
        "		/parameter-9 {" +
        "			/key 1718775156" +
        "			/showInPalette 4294967295" +
        "			/type (ustring)" +
        "			/value [ 15" +
        "				7376672066696c6520666f726d6174" +
        "			]" +
        "		}" +
        "		/parameter-10 {" +
        "			/key 1702392942" +
        "			/showInPalette 4294967295" +
        "			/type (ustring)" +
        "			/value [ 3" +
        "				737667" +
        "			]" +
        "		}" +
        "		/parameter-11 {" +
        "			/key 1936548194" +
        "			/showInPalette 4294967295" +
        "			/type (boolean)" +
        "			/value 0" +
        "		}" +
        "		/parameter-12 {" +
        "			/key 1935764588" +
        "			/showInPalette 4294967295" +
        "			/type (boolean)" +
        "			/value 0" +
        "		}" +
        "		/parameter-13 {" +
        "			/key 1936875886" +
        "			/showInPalette 4294967295" +
        "			/type (ustring)" +
        "			/value [ 0" +
        "" +
        "			]" +
        "		}" +
        "	}" +
        "}";
}

function asciiToHex(str) {
    var arr1 = [];
    for (var n = 0, l = str.length; n < l; n ++) {
        var hex = Number(str.charCodeAt(n)).toString(16);
        arr1.push(hex);
    }
    return arr1.join('');
}

function createAction(basePath, actionString, setName) {
    try {
        var actionsFolder = basePath + 'actions';
        if (! new Folder(actionsFolder).exists) {
            new Folder(actionsFolder).create();
        }
        var f = File(actionsFolder + '/' + setName + '.aia');
        f.open('w');
        f.write(actionString);
        f.close();
        app.loadAction(f);
    }
    catch(e) { alert('createAction : ' + e.message) }
}