Add the show format for the Group.

tui_rsync/models/models.py

@@ -188,6 +188,16 @@ class Group(BaseModel):
     def __repl__(self) -> str:
         return f"{self.label}"
 
+    def show_format(self) -> str:
+        output = f"[b]label:[/] {self.label}\n" \
+                 f"[b]sources:[/] \n"
+
+        for source in self.sources:
+            prefix = '\t'
+            output+=f"{source.source.show_format(prefix)}\n"
+
+        return output
+
 class GroupSource(BaseModel):
     group = ForeignKeyField(Group, backref='sources')
     source = ForeignKeyField(Source)