[d-feet/enable-gitlab-ci: 2/6] Detect 'pycodestyle', the new name for 'pep8'

[Will Thompson <wjt src gnome org>]

commit 830fb9b9456be66b63fddec908a32a2c13733722
Author: Will Thompson <will willthompson co uk>
Date:   Wed Sep 19 10:45:41 2018 +0100

    Detect 'pycodestyle', the new name for 'pep8'
    
    The 'pep8' tool has been renamed upstream to 'pycodestyle'. On Debian,
    the Python 3 version is packaged and installed as pycodestyle. On
    Fedora, it's packaged as python3-pycodestyle and installed as
    pycodestyle-3; the Python 2 version is installed as pycodestyle-2 with a
    symlink from pycodestyle. Make configure search a variety of such names,
    and use the path it finds.

 configure.ac          | 4 ++--
 src/tests/Makefile.am | 7 ++++---
 2 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 48102ea..0012abc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,8 +27,8 @@ AC_ARG_ENABLE(tests,
     enable_tests=$enableval, enable_tests=yes)
 
 if test x$enable_tests = xyes; then
-  AC_CHECK_PROG([PEP8], [pep8], [yes])
-  test -z "$PEP8" && AC_MSG_ERROR([pep8 binary not found but needed for testsuite. either install it or run 
with the argument --disable-tests to not run the testsuite.])
+  AC_CHECK_PROGS([PYCODESTYLE], [pycodestyle-3 pycodestyle pep8], [yes])
+  test -z "$PYCODESTYLE" && AC_MSG_ERROR([pycodestyle binary not found but needed for testsuite. either 
install it or run with the argument --disable-tests to not run the testsuite.])
 fi
 AM_CONDITIONAL(ENABLE_TESTS, test "x$enable_tests" = "xyes")
 
diff --git a/src/tests/Makefile.am b/src/tests/Makefile.am
index 14761b2..4e80a55 100644
--- a/src/tests/Makefile.am
+++ b/src/tests/Makefile.am
@@ -9,8 +9,9 @@ tests.py: tests.py.in
        $(AM_V_GEN) sed -e 's|@PYTHON[@]|$(PYTHON)|g' $< > $@
        chmod +x $@
 
-# Default pep8.py --exclude + emacs backup files
-PEP8_EXCLUDES=--exclude='.svn,CVS,.bzr,.hg,.git,__pycache__,.\#*'
+# Default pycodestyle --exclude + emacs backup files
+PYCODESTYLE_EXCLUDES=--exclude='.svn,CVS,.bzr,.hg,.git,__pycache__,.\#*'
 
 check-local:
-       pep8 --max-line-length=99 --ignore=E123,E402 $(PEP8_EXCLUDES) $(top_srcdir)/src/
+       $(PYCODESTYLE) --max-line-length=99 --ignore=E123,E402 \
+               $(PYCODESTYLE_EXCLUDES) $(top_srcdir)/src/