added command line to create migrations

src/main/java/jef/DatabaseOptions.java

@@ -0,0 +1,46 @@
+package jef;
+
+import lombok.Getter;
+
+import java.net.MalformedURLException;
+import java.util.regex.Pattern;
+
+@Getter
+public class DatabaseOptions {
+    protected final String url;
+    protected final String user;
+    protected final String password;
+
+    protected final String migrationsPackage;
+
+    protected final String host;
+    protected final String database;
+
+    public DatabaseOptions(String url, String user, String password, String migrationsPackage) {
+        this.url = url;
+        this.user = user;
+        this.password = password;
+
+        host = extractHost(url);
+        database = extractDatabase(url);
+        this.migrationsPackage = migrationsPackage;
+    }
+
+    private static String extractHost(String url) {
+        var pattern = Pattern.compile("^.*?//(.*?)/.*$");
+        var matcher = pattern.matcher(url);
+        if (!matcher.matches()) {
+            throw new RuntimeException(new MalformedURLException("Could not extract host for url: " + url));
+        }
+        return matcher.group(1);
+    }
+
+    private static String extractDatabase(String url) {
+        var pattern = Pattern.compile("^.*?//.*?/(.*?)([?/].*)?$");
+        var matcher = pattern.matcher(url);
+        if (!matcher.matches()) {
+            throw new RuntimeException(new MalformedURLException("Could not extract database for url: " + url));
+        }
+        return matcher.group(1);
+    }
+}