setup: use git version instead of hardcoded one

setuptool_scm [1] package is a recommended way to set package version
with git [2]. Version 5.0.2 was chosen due to Python 3.5 support,
latest version 7.0.5 supports only Python 3.7+.

Package version is displayed in documentation, so after this patch
documentation for master branch won't be confused with the last tagged
one.

1. https://pypi.org/project/setuptools-scm/
2. https://packaging.python.org/en/latest/guides/single-sourcing-package-version/

Part of #238

Author: DifferentialOrange

Diff for: .github/workflows/reusable_testing.yml

@@ -33,8 +33,8 @@ jobs:
         with:
           python-version: 3.7
 
-      - name: Install connector requirements
-        run: pip install -r requirements.txt
+      - name: Install the package
+        run: make install
 
       - name: Install test requirements
         run: pip install -r requirements-test.txt

Diff for: .github/workflows/testing.yml

@@ -79,8 +79,8 @@ jobs:
           pip install ${{ matrix.msgpack-deps }}
           sed -i -e "s/^msgpack.*$/${{ matrix.msgpack-deps }}/" requirements.txt
 
-      - name: Install package requirements
-        run: pip install -r requirements.txt
+      - name: Install the package
+        run: make install
 
       - name: Install test requirements
         run: pip install -r requirements-test.txt
@@ -135,8 +135,8 @@ jobs:
         with:
           python-version: ${{ matrix.python }}
 
-      - name: Install package requirements
-        run: pip install -r requirements.txt
+      - name: Install the package
+        run: make install
 
       - name: Install test requirements
         run: pip install -r requirements-test.txt
@@ -179,8 +179,8 @@ jobs:
         with:
           python-version: ${{ matrix.python }}
 
-      - name: Install connector requirements
-        run: pip install -r requirements.txt
+      - name: Install the package
+        run: make install
 
       - name: Install test requirements
         run: pip install -r requirements-test.txt

Diff for: Makefile

@@ -1,4 +1,6 @@
 .PHONY: test docs
+install:
+	python setup.py install
 test:
 	python setup.py test
 testdata:

Diff for: README.rst

@@ -33,7 +33,7 @@ You can also download zip archive, unpack it and run:
 
 .. code-block:: bash
 
-    $ python setup.py install
+    $ make install
 
 Development version
 ^^^^^^^^^^^^^^^^^^^
@@ -103,6 +103,7 @@ On Windows:
 * Set the following environment variables:
   * ``REMOTE_TARANTOOL_HOST=...``,
   * ``REMOTE_TARANTOOL_CONSOLE_PORT=3302``.
+* Install the package.
 * Run ``python setup.py test``.
 
 Build docs
@@ -114,7 +115,14 @@ To build documentation, first you must install its build requirements:
 
     $ pip install -r docs/requirements.txt
 
-Then run
+To build with valid version, `tarantool` package must be installed before
+documentation build.
+
+.. code-block:: bash
+
+    $ make install
+
+Build documentation the documentation with
 
 .. code-block:: bash
 

Diff for: requirements.txt

@@ -1,3 +1,4 @@
 msgpack>=1.0.4
 pandas
 pytz
+importlib-metadata >= 1.0 ; python_version < '3.8'

Diff for: setup.py

@@ -46,20 +46,11 @@ def get_dependencies():
             result = f.read().splitlines()
     return result
 
-def find_version(*file_paths):
-    version_file = read(*file_paths)
-    version_match = re.search(r"""^__version__\s*=\s*(['"])(.+)\1""",
-                              version_file, re.M)
-    if version_match:
-        return version_match.group(2)
-    raise RuntimeError("Unable to find version string.")
-
-
 setup(
     name="tarantool",
     packages=["tarantool"],
     package_dir={"tarantool": os.path.join("tarantool")},
-    version=find_version('tarantool', '__init__.py'),
+    use_scm_version=True,
     platforms=["all"],
     author="tarantool-python AUTHORS",
     author_email="[email protected]",
@@ -78,5 +69,8 @@ def find_version(*file_paths):
     cmdclass=cmdclass,
     command_options=command_options,
     install_requires=get_dependencies(),
+    setup_requires=[
+        'setuptools_scm==5.0.2',
+    ],
     python_requires='>=3',
 )

Diff for: tarantool/__init__.py

@@ -40,7 +40,12 @@
     Interval,
 )
 
-__version__ = "0.9.0"
+if sys.version_info >= (3, 8):
+    from importlib import metadata
+else:
+    import importlib_metadata as metadata
+
+__version__ = metadata.version('tarantool')
 
 
 def connect(host="localhost", port=33013, user=None, password=None,