application/src/main/java/com/buschmais/jqassistant/commandline/Main.java
private File getHomeDirectory() {
        String dirName = System.getenv(ENV_JQASSISTANT_HOME);
        if (dirName != null) {
            File dir = new File(dirName);
            if (dir.exists()) {
                LOGGER.debug("Using JQASSISTANT_HOME '" + dir.getAbsolutePath() + "'.");
                return dir;
            } else {
                LOGGER.warn("JQASSISTANT_HOME '" + dir.getAbsolutePath() + "' points to a non-existing directory.");
                return null;
            }
        }
        LOGGER.warn("JQASSISTANT_HOME is not set.");
        return null;
    }
private File getHomeDirectory() {
        String dirName = System.getenv(ENV_JQASSISTANT_HOME);
        if (dirName != null) {
            File dir = new File(dirName);
            if (dir.exists()) {
                LOGGER.debug("Using JQASSISTANT_HOME '" + dir.getAbsolutePath() + "'.");
                return dir;
            } else {
                LOGGER.warn("JQASSISTANT_HOME '" + dir.getAbsolutePath() + "' points to a non-existing directory.");
                return null;
            }
        }
        LOGGER.warn("JQASSISTANT_HOME is not set.");
        return null;
    }
Determine the JQASSISTANT_HOME directory.

@return The directory or `null`.