Add 'SizeColumn' formatter

Present file sizes in human readable format.

Change-Id: I7e4a013cba7f91e38ba496d3ba7c4a67c4cd81c5
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

osc_lib/cli/format_columns.py

@@ -58,3 +58,10 @@ class ListDictColumn(columns.FormattableColumn):
 
     def machine_readable(self):
         return [dict(x) for x in self._value or []]
+
+
+class SizeColumn(columns.FormattableColumn):
+    """Format column for file size content"""
+
+    def human_readable(self):
+        return utils.format_size(self._value)

osc_lib/tests/cli/test_format_columns.py

@@ -109,3 +109,12 @@ class TestListDictColumn(utils.TestCase):
         self.assertEqual(type(col.machine_readable()), list)
         for x in col.machine_readable():
             self.assertEqual(type(x), dict)
+
+
+class TestSizeColumn(utils.TestCase):
+
+    def test_size_column(self):
+        content = 1576395005
+        col = format_columns.SizeColumn(content)
+        self.assertEqual(content, col.machine_readable())
+        self.assertEqual('1.6G', col.human_readable())

releasenotes/notes/add-size-column-5424c40af74688df.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    A new column formatter, ``SizeFormatter``, is available. This can be used
+    to format file sizes in human readable format.