02/02: gnu: python-pycodestyle: Fix build with Python 3.7.

[guix-commits]

bavier pushed a commit to branch core-updates
in repository guix.

commit 974537fc4cd8045bcdce68c5ce79df35b0e17ec3
Author: Eric Bavier <address@hidden>
Date:   Sun Jan 13 21:08:48 2019 -0600

    gnu: python-pycodestyle: Fix build with Python 3.7.
    
    * gnu/packages/patches/python-pycodestyle-stdlib-tokenize-fix.patch: New
    patch.
    * gnu/local.mk (dist_patch_DATA): Add it.
    * gnu/packages/python.scm (python-pycodestyle)[source]: Use it.
---
 gnu/local.mk                                       |  1 +
 .../python-pycodestyle-stdlib-tokenize-fix.patch   | 35 ++++++++++++++++++++++
 gnu/packages/python.scm                            |  3 +-
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/gnu/local.mk b/gnu/local.mk
index f487f35..23ba0d4 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1108,6 +1108,7 @@ dist_patch_DATA =                                         
\
   %D%/packages/patches/python-mox3-python3.6-compat.patch      \
   %D%/packages/patches/python-testtools.patch                  \
   %D%/packages/patches/python-paste-remove-timing-test.patch   \
+  %D%/packages/patches/python-pycodestyle-stdlib-tokenize-fix.patch    \
   %D%/packages/patches/python-pycrypto-CVE-2013-7459.patch     \
   %D%/packages/patches/python2-pygobject-2-gi-info-type-error-domain.patch \
   %D%/packages/patches/python-pygpgme-fix-pinentry-tests.patch \
diff --git a/gnu/packages/patches/python-pycodestyle-stdlib-tokenize-fix.patch 
b/gnu/packages/patches/python-pycodestyle-stdlib-tokenize-fix.patch
new file mode 100644
index 0000000..16388c8
--- /dev/null
+++ b/gnu/packages/patches/python-pycodestyle-stdlib-tokenize-fix.patch
@@ -0,0 +1,35 @@
+From 397463014fda3cdefe8d6c9d117ae16d878dc494 Mon Sep 17 00:00:00 2001
+From: Michael Hudson-Doyle <address@hidden>
+Date: Tue, 25 Sep 2018 14:58:57 +1200
+Subject: [PATCH] Keep compability with stdlib tokenize.py changes
+
+https://github.com/python/cpython/commit/c4ef4896eac86a6759901c8546e26de4695a1389
+is not yet part of any release of Python but has been backported to all
+versions in Git (includeing 2.7!). It causes the tokenize.py module to
+emit a synthetic NEWLINE token for files that do not in fact end with a
+newline, which confuses pycodestyle's checks for blank lines at the end
+of a file. Fortunately the synthetic NEWLINE tokens are easy to detect
+(the token text is "").
+
+Fixes #786
+---
+ pycodestyle.py | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/pycodestyle.py b/pycodestyle.py
+index 0d725d27..fbc3dca3 100755
+--- a/pycodestyle.py
++++ b/pycodestyle.py
+@@ -258,10 +258,10 @@ def trailing_blank_lines(physical_line, lines, 
line_number, total_lines):
+     """
+     if line_number == total_lines:
+         stripped_last_line = physical_line.rstrip()
+-        if not stripped_last_line:
++        if physical_line and not stripped_last_line:
+             return 0, "W391 blank line at end of file"
+         if stripped_last_line == physical_line:
+-            return len(physical_line), "W292 no newline at end of file"
++            return len(lines[-1]), "W292 no newline at end of file"
+ 
+ 
+ @register_check
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 2971dfe..c0ed19e 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -3974,7 +3974,8 @@ as the original project seems to have been abandoned 
circa 2007.")
         (uri (pypi-uri "pycodestyle" version))
         (sha256
           (base32
-            "0fhy4vnlgpjq4qd1wdnl6pvdw7rah0ypmn8c9mkhz8clsndskz6b"))))
+            "0fhy4vnlgpjq4qd1wdnl6pvdw7rah0ypmn8c9mkhz8clsndskz6b"))
+        (patches (search-patches 
"python-pycodestyle-stdlib-tokenize-fix.patch"))))
     (build-system python-build-system)
     (home-page "https://pycodestyle.readthedocs.io/";)
     (synopsis "Python style guide checker")