Pretty hash display utility

Author: carver

tests/trinity/core/humanize-utils/test_humanize_elapsed.py renamed to tests/trinity/core/utils/test_humanize.py

@@ -1,6 +1,6 @@
 import pytest
 
-from trinity.utils.humanize import humanize_elapsed
+from trinity.utils.humanize import humanize_elapsed, humanize_hash
 
 
 SECOND = 1
@@ -39,3 +39,13 @@
 def test_humanize_elapsed(seconds, expected):
     actual = humanize_elapsed(seconds)
     assert actual == expected
+
+
+@pytest.mark.parametrize(
+    'hash32,expected',
+    (
+        (bytes(range(32)), '000102..1d1e1f'),
+    )
+)
+def test_humanize_hash(hash32, expected):
+    assert humanize_hash(hash32) == expected

trinity/utils/humanize.py

@@ -1,5 +1,7 @@
 from typing import Iterator
 
+from eth_typing import Hash32
+
 
 def humanize_elapsed(seconds: int) -> str:
     return ''.join(_humanize_elapsed(seconds))
@@ -44,3 +46,12 @@ def _humanize_elapsed(seconds: int) -> Iterator[str]:
             return
 
         remainder %= duration
+
+
+DISPLAY_HASH_BYTES = 3
+
+
+def humanize_hash(value: Hash32) -> str:
+    head = value[:DISPLAY_HASH_BYTES]
+    tail = value[-1 * DISPLAY_HASH_BYTES:]
+    return f"{head.hex()}..{tail.hex()}"