python: line_profiler: fix build with Python 3.7

_line_profiler.c has to be regenerated by Cython.

I did not use fetchpatch because this patch does not have a stable source.

pkgs/development/python-modules/line_profiler/default.nix

@@ -16,12 +16,18 @@ buildPythonPackage rec {
     sha256 = "efa66e9e3045aa7cb1dd4bf0106e07dec9f80bc781a993fbaf8162a36c20af5c";
   };
 
+  patches = [ ./python37.patch ];
+
   buildInputs = [ cython ];
 
   propagatedBuildInputs = [ ipython ];
 
   disabled = isPyPy;
 
+  preBuild = ''
+    rm -f _line_profiler.c
+  '';
+
   checkPhase = ''
     ${python.interpreter} -m unittest discover -s tests
   '';

pkgs/development/python-modules/line_profiler/python37.patch

@@ -0,0 +1,36 @@
+From 542baf59f3b2eada13bde48e8a89e484c2cfeeef Mon Sep 17 00:00:00 2001
+From: Hanaasagi <ambiguous404@gmail.com>
+Date: Wed, 17 Apr 2019 06:46:03 +0000
+Subject: [PATCH] Support Python 3.7 Generator (PEP 479)
+
+---
+ kernprof.py      | 2 ++
+ line_profiler.py | 2 ++
+ 2 files changed, 4 insertions(+)
+
+diff --git a/kernprof.py b/kernprof.py
+index 108d36e..6461cf6 100755
+--- a/kernprof.py
++++ b/kernprof.py
+@@ -102,6 +102,8 @@ def wrapper(*args, **kwds):
+                 self.enable_by_count()
+                 try:
+                     item = g.send(input)
++                except StopIteration:
++                    return
+                 finally:
+                     self.disable_by_count()
+                 input = (yield item)
+diff --git a/line_profiler.py b/line_profiler.py
+index a481dd2..5744d05 100755
+--- a/line_profiler.py
++++ b/line_profiler.py
+@@ -100,6 +100,8 @@ def wrapper(*args, **kwds):
+                 self.enable_by_count()
+                 try:
+                     item = g.send(input)
++                except StopIteration:
++                    return
+                 finally:
+                     self.disable_by_count()
+                 input = (yield item)