Illustrator script to edit multiply files

Great. I have written a script that will process your svg files. Instructions are in the script header. You can look through and get an idea of what it is doing. It just removes some unwanted attributes from each path and adds a class name "line" and adds a CSS style definition. You should edit the style definition to suit your needs. Let me know how it goes.

- Mark

Before:

After:

/**
 * @File Style SVG Files.js
 *
 * Set up:
 * Run this script once, to create "SVG IMPORT" and "SVG EXPORT"
 * folders in the same location as this script file.
 *
 * Usage:
 * 1. Put your svg files into "SVG IMPORT"
 * 2. Run script
 * 3. Collect the resulting svg files from "SVG EXPORT"
 *
 * @7111211 m1b
 * @version 2025-02-26
 * @discussion https://community.adobe.com/t5/illustrator-discussions/illustrator-script-to-edit-multiply-files/m-p/15177289
 */
(function () {

    // edit this to match your needs
    // must be valid CSS
    var style = [
        'fill: none;',
        'stroke: #1d1d1b;',
        'stroke-width: .2px;',
        'stroke-miterlimit: 10;',
    ];

    var svgImportFolder = Folder(File($.fileName).parent + '/SVG IMPORT/'),
        svgExportFolder = Folder(File($.fileName).parent + '/SVG EXPORT/');

    if (!svgImportFolder.exists)
        svgImportFolder.create();

    if (!svgExportFolder.exists)
        svgExportFolder.create();

    // collect the svg files
    var files = svgImportFolder.getFiles(),
        fileCounter = 0;

    // this is the style definition element
    var styleElement = new XML(
        '<defs><style>.line {##STYLE##}</style></defs>'
            .replace('##STYLE##', style.join(' '))
    );

    fileLoop:
    for (var i = 0; i < files.length; i++) {

        var f = files[i];
        f.open('r');
        var svg = f.read();

        if (!svg)
            continue fileLoop;

        try {

            var xml = new XML(svg),
                elements = xml.descendants(),
                len = elements.length(),
                elementCounter = 0;

        } catch (error) {
            // failed to parse XML
            continue fileLoop;
        }

        elementLoop:
        for (var j = 0; j < len; j++) {

            var el = elements[j];

            if ('path' !== el.localName())
                continue elementLoop;

            // remove unwanted attributes
            delete el['@stroke-width'];
            delete el['@stroke'];
            delete el['@fill'];

            // add our class
            el['@class'] = 'line';

            elementCounter++;

        }

        if (0 === elementCounter)
            continue fileLoop;

        // Append <defs> to the root <svg>
        xml.insertChildBefore(elements[0], styleElement);

        // write to file
        var exportFile = File(svgExportFolder + '/' + decodeURI(f.name));
        exportFile.open('w');
        var success = exportFile.write(xml.toString());

        if (success)
            fileCounter++

    }

    alert('Processed ' + fileCounter + ' svg files.');

})();

Edit 2025-02-26: minor typo.