build.xml

<?xml version="1.0" encoding="utf-8"?>
<project name="extjs-lib-core" default=".help">

    <script language="javascript">
        <![CDATA[
            var dir = project.getProperty("basedir"),
                cmdDir = project.getProperty("cmd.dir"),
                cmdLoaded = project.getReference("senchaloader");

            if (!cmdLoaded) {
                function echo(message, file) {
                    var e = project.createTask("echo");
                    e.setMessage(message);
                    if (file) {
                        e.setFile(file);
                    }
                    e.execute();
                };

                if (!cmdDir) {

                    function exec(args) {
                        var process = java.lang.Runtime.getRuntime().exec(args),
                            input = new java.io.BufferedReader(new java.io.InputStreamReader(process.getInputStream())),
                            headerFound = false,
                            line;

                        while (line = input.readLine()) {
                            line = line + '';
                            java.lang.System.out.println(line);
                            if (line.indexOf("Sencha Cmd") > -1) {
                                headerFound = true;
                            }
                            else if (headerFound && !cmdDir) {
                                cmdDir = line;
                                project.setProperty("cmd.dir", cmdDir);
                            }
                        }
                        process.waitFor();
                        return !!cmdDir;
                    }

                    if (!exec(["sencha", "which"])) {
                        var tmpFile = "tmp.sh";
                        echo("source ~/.bash_profile; sencha " + whichArgs.join(" "), tmpFile);
                        exec(["/bin/sh", tmpFile]);
                        new java.io.File(tmpFile)['delete']();
                    }
                }
            }

            if (cmdDir && !project.getTargets().containsKey("init-cmd")) {
                var importDir = project.getProperty("build-impl.dir") ||
                                (cmdDir + "/ant/build/package/build-impl.xml");
                var importTask = project.createTask("import");

                importTask.setOwningTarget(self.getOwningTarget());
                importTask.setLocation(self.getLocation());
                importTask.setFile(importDir);
                importTask.execute();
            }
        ]]>
    </script>

    <!--
    The following targets can be provided to inject logic before and/or after key steps
    of the build process:

        The "init-local" target is used to initialize properties that may be personalized
        for the local machine.

            <target name="-before-init-local"/>
            <target name="-after-init-local"/>

        The "clean" target is used to clean build output from the build.dir.

            <target name="-before-clean"/>
            <target name="-after-clean"/>

        The general "init" target is used to initialize all other properties, including
        those provided by Sencha Cmd.

            <target name="-before-init"/>
            <target name="-after-init"/>

        The "build" target performs the call to Sencha Cmd to build the application.

            <target name="-before-build"/>
            <target name="-after-build"/>
    -->

    <target name="-before-build">
        <exec executable="cmd">
            <arg line="/c npx delorean -p"/>
        </exec>
    </target>

    <target name="-after-build">
        <exec executable="cmd">
            <arg line="/c npx delorean -r"/>
        </exec>
    </target>

</project>