Added 'bat blocks' command that shows the DNA types that use the most data

It's work in progress and maybe not useful for anyone but us.

blender_asset_tracer/cli/common.py

@@ -18,6 +18,8 @@
 #
 # (c) 2018, Blender Foundation - Sybren A. Stüvel
 """Common functionality for CLI parsers."""
+import typing
+
 import pathlib
 
 
@@ -40,3 +42,58 @@ def shorten(cwd: pathlib.Path, somepath: pathlib.Path) -> pathlib.Path:
         return somepath.relative_to(cwd)
     except ValueError:
         return somepath
+
+
+def humanize_bytes(size_in_bytes: int, precision: typing.Optional[int]=None):
+    """Return a humanized string representation of a number of bytes.
+
+    Source: http://code.activestate.com/recipes/577081-humanized-representation-of-a-number-of-bytes
+
+    :param size_in_bytes: The size to humanize
+    :param precision: How many digits are shown after the comma. When None,
+        it defaults to 1 unless the entire number of bytes is shown, then
+        it will be 0.
+
+    >>> humanize_bytes(1)
+    '1 B'
+    >>> humanize_bytes(1024)
+    '1.0 kB'
+    >>> humanize_bytes(1024*123, 0)
+    '123 kB'
+    >>> humanize_bytes(1024*123)
+    '123.0 kB'
+    >>> humanize_bytes(1024*12342)
+    '12.1 MB'
+    >>> humanize_bytes(1024*12342,2)
+    '12.05 MB'
+    >>> humanize_bytes(1024*1234,2)
+    '1.21 MB'
+    >>> humanize_bytes(1024*1234*1111,2)
+    '1.31 GB'
+    >>> humanize_bytes(1024*1234*1111,1)
+    '1.3 GB'
+    """
+
+    if precision is None:
+        precision = size_in_bytes >= 1024
+
+    abbrevs = (
+        (1 << 50, 'PB'),
+        (1 << 40, 'TB'),
+        (1 << 30, 'GB'),
+        (1 << 20, 'MB'),
+        (1 << 10, 'kB'),
+        (1, 'B')
+    )
+    for factor, suffix in abbrevs:
+        if size_in_bytes >= factor:
+            break
+    else:
+        factor = 1
+        suffix = 'B'
+    return '%.*f %s' % (precision, size_in_bytes / factor, suffix)
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()