chore: add a lot of infrastructure files

.flake8

@@ -0,0 +1,36 @@
+[flake8]
+ignore =
+    E203
+    E266
+    E501
+    W503
+    F403
+    F401
+    E231
+max-line-length = 88
+# Should be 18.
+max-complexity = 25
+exclude =
+    development/*
+# Not ready for this yet.
+per-file-ignores =
+    scripts/hmf: F821
+    scripts/hmf-fit: F821
+select = B,C,E,F,W,T4,B9,D
+rst-roles =
+    class
+    func
+    mod
+    data
+    const
+    meth
+    attr
+    exc
+    obj
+rst-directives =
+    note
+    warning
+    versionadded
+    versionchanged
+    deprecated
+    seealso

.pre-commit-config.yaml

@@ -0,0 +1,33 @@
+exclude: '^docs/conf.py'
+
+repos:
+- repo: git://github.com/pre-commit/pre-commit-hooks
+  rev: v2.5.0
+  hooks:
+  - id: trailing-whitespace
+  - id: check-added-large-files
+  - id: check-ast
+  - id: check-json
+  - id: check-merge-conflict
+  - id: check-xml
+  - id: check-yaml
+  - id: debug-statements
+  - id: end-of-file-fixer
+  - id: requirements-txt-fixer
+  - id: check-merge-conflict
+  - id: mixed-line-ending
+    args: ['--fix=no']
+-   repo: https://gitlab.com/pycqa/flake8
+    rev: '3.8.1'  # pick a git hash / tag to point to
+    hooks:
+    -   id: flake8
+        additional_dependencies:
+          - flake8-rst-docstrings
+-   repo: https://github.com/psf/black
+    rev: 19.10b0
+    hooks:
+    - id: black
+-   repo: https://github.com/pre-commit/pygrep-hooks
+    rev: v1.5.1
+    hooks:
+      - id: rst-backticks

hera_sim/__init__.py

@@ -1,3 +1,15 @@
+try:
+    from importlib.metadata import version, PackageNotFoundError
+except ImportError:
+    from importlib_metadata import version, PackageNotFoundError
+
+try:
+    __version__ = version(__name__)
+except PackageNotFoundError:
+    print("package not found")
+    # package is not installed
+    pass
+
 from . import __yaml_constructors
 from . import antpos
 from . import foregrounds
@@ -7,16 +19,12 @@
 from . import rfi
 from . import sigchain
 from hera_sim.visibilities import simulators
-from . import version
 from . import eor
 from . import utils
 from . import simulate
-from .cli import run # for testing purposes
+from .cli import run  # for testing purposes
 from .simulate import Simulator
 from .defaults import defaults
 from .components import SimulationComponent, registry
 from .components import list_discoverable_components
 from .interpolators import Tsky, Bandpass, Beam
-
-__version__ = version.version
-