padding

scan.py

@@ -999,18 +999,31 @@ def summary_table(
 ) -> str:
     """Render image/container/severity counts as a monospaced markdown table."""
     headers = ["Image", "Container"] + [name[0] for name in severities]
-    lines = [
-        "```",
-        "| " + " | ".join(headers) + " |",
-        "| " + " | ".join("---" for _ in headers) + " |",
-    ]
+    table_rows: list[list[str]] = []
     for image, container, counts, fixable_counts in rows:
         cells = [short_image(image), container or "-"]
         cells += [
             f"{fixable_counts.get(name, 0)}/{counts.get(name, 0)}"
             for name in severities
         ]
-        lines.append("| " + " | ".join(cells) + " |")
+        table_rows.append(cells)
+
+    widths = [max(3, len(header)) for header in headers]
+    for cells in table_rows:
+        for index, cell in enumerate(cells):
+            widths[index] = max(widths[index], len(cell))
+
+    def render(cells: list[str]) -> str:
+        return "| " + " | ".join(
+            cell.ljust(widths[index]) for index, cell in enumerate(cells)
+        ) + " |"
+
+    lines = [
+        "```",
+        render(headers),
+        "| " + " | ".join("-" * width for width in widths) + " |",
+    ]
+    lines += [render(cells) for cells in table_rows]
     lines.append("```")
     return "\n".join(lines)