Shoe metadata percentages, and code even if empty

Author: hyanwong

python/tskit/trees.py

@@ -4476,7 +4476,7 @@ def __str__(self):
             ["Sample Nodes", util.format_number(self.num_samples, sep=",")],
             ["Total Size", util.naturalsize(self.nbytes)],
         ]
-        header = ["Table", "Rows", "Size", "Metadata"]
+        header = ["Table", "Rows", "Size", "Metadata (size)"]
         table_rows = []
         for name, table in self.tables.table_name_map.items():
             table_rows.append(

python/tskit/util.py

@@ -535,9 +535,11 @@ def html_table(rows, *, header):
 
 
 def metadata_details(table):
-    size = naturalsize(len(table.metadata))
     schema = table.metadata_schema.schema
-    return size + ("" if schema is None else f" ({schema['codec']})")
+    if len(table.metadata) == 0 and schema is None:
+        return ""
+    size = f"({len(table.metadata) / table.nbytes:.1%})"
+    return ("" if schema is None else f"{schema['codec']} ") + size
 
 
 def tree_sequence_html(ts):
@@ -547,11 +549,9 @@ def tree_sequence_html(ts):
                 <td>{name.capitalize()}</td>
                 <td>{format_number(table.num_rows)}</td>
                 <td>{naturalsize(table.nbytes)}</td>
-                <td style="text-align: center;">
-                    {metadata_details(table)
-                     if hasattr(table, "metadata") and len(table.metadata) > 0
-                     else ''}
-                </td>
+                <td style="text-align: center;">{metadata_details(table)
+                                                 if hasattr(table, "metadata")
+                                                 else ""}</td>
             </tr>
         """
         for name, table in ts.tables.table_name_map.items()
@@ -644,7 +644,7 @@ def tree_sequence_html(ts):
                                 <th style="line-height:21px;">Table</th>
                                 <th>Rows</th>
                                 <th>Size</th>
-                                <th>Metadata</th>
+                                <th>Metadata (size)</th>
                             </tr>
                         </thead>
                         <tbody>