From e9c75f7ca172d931d11840f129301b90148f3560 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Sun, 12 Apr 2020 03:59:56 +0000
Subject: [PATCH] hdl.ast: improve repr() for Shape.

The default __repr__() from typing.NamedTuple does not include
the module name, so the replacement (which uses the preferred syntax
for specifying these shapes) doesn't either.
---
 nmigen/hdl/ast.py           | 6 ++++++
 nmigen/test/test_hdl_ast.py | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/nmigen/hdl/ast.py b/nmigen/hdl/ast.py
index cadf960..fa2c9d1 100644
--- a/nmigen/hdl/ast.py
+++ b/nmigen/hdl/ast.py
@@ -89,6 +89,12 @@ class Shape(typing.NamedTuple):
             return Shape(width, signed)
         raise TypeError("Object {!r} cannot be used as value shape".format(obj))
 
+    def __repr__(self):
+        if self.signed:
+            return "signed({})".format(self.width)
+        else:
+            return "unsigned({})".format(self.width)
+
 
 # TODO: use dataclasses instead of this hack
 def _Shape___init__(self, width=1, signed=False):
diff --git a/nmigen/test/test_hdl_ast.py b/nmigen/test/test_hdl_ast.py
index c0d26ee..26e506a 100644
--- a/nmigen/test/test_hdl_ast.py
+++ b/nmigen/test/test_hdl_ast.py
@@ -39,6 +39,10 @@ class ShapeTestCase(FHDLTestCase):
                 msg="Width must be a non-negative integer, not -1"):
             Shape(-1)
 
+    def test_repr(self):
+        self.assertEqual(repr(Shape()), "unsigned(1)")
+        self.assertEqual(repr(Shape(2, True)), "signed(2)")
+
     def test_tuple(self):
         width, signed = Shape()
         self.assertEqual(width, 1)
-- 
2.30.2