preparing importer for ReparierCafe

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.cal.base/build.gradle.kts

@@ -3,7 +3,6 @@ description = "OpenCloudCal : Base"
 dependencies {
     implementation(project(":de.srsoftware.cal.api"))
 
-    implementation("de.srsoftware:tools.container:1.0.6")
     implementation("de.srsoftware:tools.mime:1.1.4")
     implementation("de.srsoftware:tools.optionals:1.0.0")
     implementation("de.srsoftware:tools.util:2.1.1")

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/BaseImporter.java

@@ -2,17 +2,16 @@
 package de.srsoftware.cal;
 
 import static de.srsoftware.cal.Util.*;
-import static de.srsoftware.tools.container.Error.error;
-import static de.srsoftware.tools.container.Container.transform;
 import static de.srsoftware.tools.Tag.HREF;
 import static de.srsoftware.tools.TagFilter.*;
+import static de.srsoftware.tools.container.Container.transform;
+import static de.srsoftware.tools.container.Error.error;
 import static java.lang.System.Logger.Level.DEBUG;
 
 import de.srsoftware.cal.api.*;
 import de.srsoftware.tools.*;
 import de.srsoftware.tools.container.Container;
 import de.srsoftware.tools.container.Payload;
-
 import java.io.InputStream;
 import java.net.*;
 import java.time.LocalDate;

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/IcalImporter.java

@@ -0,0 +1,49 @@
+/* © SRSoftware 2026 */
+package de.srsoftware.cal;
+
+import static de.srsoftware.tools.container.Container.transform;
+import static de.srsoftware.tools.container.Error.error;
+
+import de.srsoftware.cal.api.Appointment;
+import de.srsoftware.cal.api.Importer;
+import de.srsoftware.tools.container.Container;
+import de.srsoftware.tools.container.Payload;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+import java.util.Scanner;
+import java.util.stream.Stream;
+
+public abstract class IcalImporter implements Importer {
+
+	@Override
+	public Stream<Appointment> fetch() throws IOException {
+		var programPage = Payload.of(url()).map(Util::url);
+
+		return programPage
+				.map(Util::open)
+				.map(Util::preload)
+				.map(IcalImporter::parse)
+				.stream();
+	}
+
+	private static Container<List<Appointment>> parse(Container<InputStream> input) {
+		if (input.optional().isEmpty()) return transform(input);
+		InputStream stream = input.optional().get();
+		var scanner = new Scanner(stream);
+		while (scanner.hasNextLine()){
+			var line = scanner.nextLine();
+			System.out.println(line);
+		}
+		scanner.close();
+		try {
+			stream.close();
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+		return error("Not implemented");
+	}
+
+
+	public abstract String url();
+}

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/SinglePageImporter.java

@@ -5,9 +5,9 @@ import static de.srsoftware.cal.Util.url;
 
 import de.srsoftware.cal.api.Appointment;
 import de.srsoftware.cal.api.Link;
-import de.srsoftware.tools.container.Payload;
-import de.srsoftware.tools.container.Container;
 import de.srsoftware.tools.Tag;
+import de.srsoftware.tools.container.Container;
+import de.srsoftware.tools.container.Payload;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.List;

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/Util.java

@@ -4,8 +4,6 @@ package de.srsoftware.cal;
 import static de.srsoftware.tools.Tag.STYLE;
 import static de.srsoftware.tools.container.Container.transform;
 import static de.srsoftware.tools.container.Error.error;
-
-import static java.lang.System.Logger.Level.DEBUG;
 import static java.lang.System.Logger.Level.WARNING;
 
 import de.srsoftware.cal.api.Attachment;
@@ -13,7 +11,6 @@ import de.srsoftware.cal.api.Coords;
 import de.srsoftware.tools.*;
 import de.srsoftware.tools.container.Container;
 import de.srsoftware.tools.container.Payload;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;