Start using pyproject.toml (sort of)

On the path to being compatible with PEPs 518 & 517.

- the pyproject.toml isn't used for build or dependencies yet, still
  use setuptools (w/ setup.py) for that.
- dependencies (both runtime and dev) are specified in requirements.txt
- pyproject.toml is used for most of the tools now, except
  pytest (see: pytest-dev/pytest#1556) and mypy (see:
  python/mypy#5205)

Author: suvayu

pyproject.toml

@@ -0,0 +1,58 @@
+[project]
+name = "SENTINEL-archive"
+version = "0.1.dev0"
+description = "A datapackage (https://frictionlessdata.io/specs/data-package/) implementation for the SENTINEL project."
+repository = "https://github.com/sentinel-energy/sentinel-archive"
+keywords = ["datapackage", "SENTINEL", "archive"]
+classifiers = [
+    "Development Status :: 2 - Pre-Alpha",
+    "Intended Audience :: Science/Research",
+    "Topic :: Scientific/Engineering",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only"
+]
+
+[dependencies]
+
+[dev-dependencies]
+
+[build-system]
+requires = ["setuptools>=42", "setuptools_scm[toml]>=3.4" ]
+build-backend = "setuptools.build_meta"
+
+# [tool.setuptools_scm]
+# write_to = "sark/version.py"
+
+[tool.pytest]
+# not yet supported, see: https://github.com/pytest-dev/pytest/issues/1556
+
+[tool.coverage.run]
+omit = ["sark/cli.py"]
+
+# [tool.mypy]
+# ignore_missing_imports = "True"
+
+[tool.black]
+line-length = 79
+include = '\.pyi?$'
+exclude = '''
+/(
+    \.eggs
+  | \.git
+  | \.github
+  | \.mypy_cache
+  | \.pytest_cache
+  | \.vscode
+  | _build
+  | build
+  | dist
+  | .*\.egg-info
+
+  # directories without python source files
+  | testing/data
+  | tmp
+  | htmlcov
+  | dsts
+)/
+'''

requirements.txt

@@ -1,4 +1,4 @@
-coverage
+coverage[toml]
 datapackage
 flake8
 glom

setup.cfg

@@ -0,0 +1,6 @@
+[tool:pytest]
+addopts = -ra -q --cov=sark
+# --doctest-modules --doctest-continue-on-failure 
+
+[mypy]
+ignore_missing_imports = True