Add sub command 'tree' to show dependencies

src/model/requirements.rs

@@ -0,0 +1,38 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2023 Comprehensive Cancer Center Mainfranken
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+use crate::model::data_catalogue::DataCatalogue;
+use crate::model::onkostar_editor::OnkostarEditor;
+use crate::model::property_catalogue::PropertyCatalogue;
+
+pub enum Requirement<'a> {
+    PropertyCatalogue(&'a PropertyCatalogue),
+    DataCatalogue(&'a DataCatalogue),
+}
+
+pub trait Requires {
+    fn get_required_entries<'a>(&'a self, all: &'a OnkostarEditor) -> Vec<Requirement>;
+
+    fn to_requirement_string<'a>(&'a self, all: &'a OnkostarEditor) -> String;
+}