Add command to show settlement

piket_client/cli.py

 import click
-from piket_client.model import ServerStatus, NetworkError
+from piket_client.model import ServerStatus, NetworkError, Consumption, Settlement
+from prettytable import PrettyTable
 
 
 @click.group()
     open_consumptions = ServerStatus.unsettled_consumptions()
 
     if isinstance(open_consumptions, NetworkError):
-        print_error(f"Failed to get unsettled consumptions, error {open_consumptions.value}")
+        print_error(
+            f"Failed to get unsettled consumptions, error {open_consumptions.value}"
+        )
         return
 
     click.echo(f"There are {open_consumptions.amount} unsettled consumptions.")
     pass
 
 
+@settlements.command("show")
+@click.argument("settlement_id", type=click.INT)
+def show_settlement(settlement_id: int) -> None:
+    """Get and view the contents of a Settlement."""
+    s = Settlement.get(settlement_id)
+
+    if isinstance(s, NetworkError):
+        print_error(f"Could not get Settlement: {s.value}")
+        return
+
+    click.echo(f"Settlement {settlement_id}, \"{s.name}\"")
+
+    click.echo(f"Summary:")
+    for key, value in s.consumption_summary.items():
+        click.echo(f" - {value['count']} {value['name']} ({key})")
+
+    ct_name_by_id = {key: value["name"] for key, value in s.consumption_summary.items()}
+
+    table = PrettyTable()
+    table.field_names = ["Name", *ct_name_by_id.values()]
+    table.sortby = "Name"
+    table.align = "r"
+    table.align["Name"] = "l"  # type: ignore
+
+    zero_fields = {k: "" for k in ct_name_by_id.values()}
+
+    for item in s.per_person_counts.values():
+        r = {"Name": item["full_name"], **zero_fields}
+        for key, value in item["counts"].items():
+            r[ct_name_by_id[key]] = value
+
+        table.add_row(r.values())
+
+    print(table)
+
+
 def print_ok(msg: str) -> None:
     click.echo(click.style(msg, fg="green"))