statd: fix 'show system' regression, broken in b826bcb

The table_width() class method was lost in b826bcb9d, so we take the
opportunit to refactor to SimpleTable.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/statd/python/cli_pretty/cli_pretty.py

@@ -186,14 +186,6 @@ class PadLldp:
     port_id = 20
 
 
-class PadDiskUsage:
-    mount = 18
-    size = 12
-    used = 12
-    avail = 12
-    percent = 6
-
-
 def format_memory_bytes(bytes_val):
     """Convert bytes to human-readable format"""
     if bytes_val == 0:
@@ -221,11 +213,6 @@ def format_uptime_seconds(seconds):
     else:
         return f"{seconds // 86400}d"
 
-    @classmethod
-    def table_width(cls):
-        """Total width of disk usage table"""
-        return cls.mount + cls.size + cls.used + cls.avail + cls.percent
-
 
 class Column:
     """Column definition for SimpleTable"""
@@ -2939,7 +2926,7 @@ def show_system(json):
         except (ValueError, KeyError):
             pass
 
-    width = PadDiskUsage.table_width()
+    width = 62
     print(Decore.invert(f"{'SYSTEM INFORMATION':<{width}}"))
     print(f"{'OS Name':<20}: {platform.get('os-name', 'Unknown')}")
     print(f"{'OS Version':<20}: {platform.get('os-version', 'Unknown')}")
@@ -3022,23 +3009,23 @@ def show_system(json):
     disk_filtered = [d for d in disk if d.get("mount") != "/"]
     if disk_filtered:
         Decore.title("Disk Usage", width)
-        hdr = (f"{'MOUNTPOINT':<{PadDiskUsage.mount}}"
-               f"{'SIZE':>{PadDiskUsage.size}}"
-               f"{'USED':>{PadDiskUsage.used}}"
-               f"{'AVAIL':>{PadDiskUsage.avail}}"
-               f"{'USE%':>{PadDiskUsage.percent}}")
-        print(Decore.invert(hdr))
+        disk_table = SimpleTable([
+            Column('MOUNTPOINT', flexible=True),
+            Column('SIZE', 'right'),
+            Column('USED', 'right'),
+            Column('AVAIL', 'right'),
+            Column('USE%', 'right')
+        ], min_width=width)
+
         for d in disk_filtered:
-            mount = d.get("mount", "?")
-            size = d.get("size", "?")
-            used = d.get("used", "?")
-            avail = d.get("available", "?")
-            percent = d.get("percent", "?")
-            print(f"{mount:<{PadDiskUsage.mount}}"
-                  f"{size:>{PadDiskUsage.size}}"
-                  f"{used:>{PadDiskUsage.used}}"
-                  f"{avail:>{PadDiskUsage.avail}}"
-                  f"{percent:>{PadDiskUsage.percent}}")
+            disk_table.row(
+                d.get("mount", "?"),
+                d.get("size", "?"),
+                d.get("used", "?"),
+                d.get("available", "?"),
+                d.get("percent", "?")
+            )
+        disk_table.print()
 
 
 def show_dhcp_server(json, stats):