luna-utils.js

var Module;
// From emscripten: in order to reference the preexisting Module var or create it if needed.
if (!Module) Module = (typeof Module !== 'undefined' ? Module : null) || {};

Module['preRun'] = function() {

    callLuna = function(inputFileName, tnsFileName)
    {
        return (function MyCallMain(args) {
            args = args || [];
            ensureInitRuntime();
            var argc = args.length + 1;
            function pad() {
                for (var i = 0; i < 4 - 1; i++) {
                    argv.push(0);
                }
            }
            var argv = [allocate(intArrayFromString(Module['thisProgram']), 'i8', ALLOC_NORMAL)];
            pad();
            for (var i = 0; i < argc - 1; i = i + 1) {
                argv.push(allocate(intArrayFromString(args[i]), 'i8', ALLOC_NORMAL));
                pad();
            }
            argv.push(0);
            argv = allocate(argv, 'i32', ALLOC_NORMAL);

            return Module['_main'](argc, argv, 0);
        })([inputFileName, tnsFileName]);
    };

    makeAndDownloadTNS = function(luaScript)
    {
        const luaFileName = 'myScript.lua';
        const tnsFileName = 'myScript.tns';
        FS.writeFile(luaFileName, luaScript);
        try { FS.unlink(tnsFileName); } catch (e){}
        const retVal = callLuna(luaFileName, tnsFileName);
        if (retVal !== 0) {
            alert('Oops, something went wrong generating the .tns file (see console)');
            return;
        }
        const file = FS.readFile(tnsFileName, {encoding: 'binary'});
        if (file) {
            const blob = new Blob([file], {type: 'application/octet-stream'});
            window['saveAs'](blob, tnsFileName);
        } else {
            alert('Oops, something went wrong retrieving the generated .tns file :(');
        }
    };

    fileLoaded = function(event, filename)
    {
        if (event.target.readyState == FileReader.DONE)
        {
            var tnsName = filename.replace(/\.(lua|xml)$/, '.tns');
            FS.writeFile(filename, new Uint8Array(event.target.result), {encoding: 'binary'});
            try { FS.unlink(tnsName); } catch (e){}
            var retVal = callLuna(filename, tnsName);
            if (retVal !== 0) {
                alert('Oops, something went wrong generating the .tns file (see console)');
                return;
            }
            var file = FS.readFile(tnsName, {encoding: 'binary'});
            if (file) {
                var blob = new Blob([file], {type: 'application/octet-stream'});
                window['saveAs'](blob, tnsName);
            } else {
                alert('Oops, something went wrong retrieving the generated .tns file :(');
            }
        }
    };

    fileLoad = function(event)
    {
        var file = event.target.files[0];
        if (!file || (file.name.substr(-4) !== '.lua' && file.name.substr(-4) !== '.xml'))
        {
            alert('Error: a .lua script or .xml file is needed');
            return;
        }

        var reader = new FileReader();
        reader.onloadend = function(event) {
            fileLoaded(event, file.name);
        };
        reader.readAsArrayBuffer(file);
    };

}; // preRun function