build.xml

<?xml version="1.0" encoding="UTF-8"?>

<project name="nm-twitter-api" default="build" basedir=".">

    <target name="build" depends="build-common" />

    <target name="build-common" depends="composer" />

    <target name="composer" depends="composer-install,composer-update" description="Install or update dependencies" />

    <target name="composer.check">
        <condition property="composer.exist">
            <available file="${project.basedir}/vendor" type="dir" />
        </condition>
    </target>

    <target name="composer-install" depends="composer.check" unless="composer.exist" description="Installing dependencies">
        <echo>Installing dependencies</echo>
        <exec executable="composer">
            <arg value="install" />
            <arg value="--no-dev" />
            <arg value="--no-interaction" />
        </exec>
    </target>

    <target name="composer-update" depends="composer.check" if="composer.exist" description="Updating dependencies">
        <echo>Updating dependencies</echo>
        <exec executable="composer">
            <arg value="update" />
            <arg value="--no-dev" />
            <arg value="--no-interaction" />
        </exec>
    </target>

</project>