Misc fixes (#2)

Github Actions badge in README.md
Github Actions on for push and PR to master
Version string in a single location

.github/workflows/pythonpackage.yml

@@ -1,6 +1,12 @@
 name: Python package
 
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   build:

README.md

@@ -1,3 +1,5 @@
+![](https://github.com/MetOffice/stylist/workflows/Python%20package/badge.svg)
+
 # Stylist
 
 The immediate need was for a code style checking tool which understood Fortran.

setup.py

@@ -1,22 +1,28 @@
 """Setup Stylist for distribution on PyPI."""
 
+from ast import literal_eval
 import os
 from setuptools import setup, find_packages
 
 # Get the long description from the README file
+HERE = os.path.dirname(__file__)
+with open(os.path.join(HERE, 'README.md'), encoding='utf-8',) as handle:
+    LONG_DESCRIPTION = handle.read()
 with open(
-    os.path.join(os.path.dirname(__file__), 'README.md'),
+    os.path.join(HERE, 'source', 'stylist', '__init__.py'),
     encoding='utf-8',
 ) as handle:
-    LONG_DESCRIPTION = handle.read()
+    for line in handle:
+        items = line.split('=', 1)
+        if items[0].strip() == '__version__':
+            VERSION = literal_eval(items[1].strip())
+            break
+    else:
+        raise RuntimeError('Cannot determine package version.')
 
 setup(
     name='stylist',
-    # TODO:
-    # For a discussion on single-sourcing the version across setup.py and the
-    # project code, see
-    # https://packaging.python.org/en/latest/single_source_version.html
-    version='0.1',
+    version=VERSION,
     description=(
         'Extensible code style checker'
         ' currently supporting Fortran, PSyclone DSL, etc'

source/stylist/__init__.py

@@ -4,3 +4,8 @@
 # The file LICENCE, distributed with this code, contains details of the terms
 # under which the code may be used.
 ##############################################################################
+'''
+Extensible code style checker currently supporting Fortran, PSyclone DSL, etc
+'''
+
+__version__ = '0.1'