chore(packaging): Fix computing SCM-based version @ the dists (#735)

The previously existing attempt to use `setuptools-git-version` never
worked as it wasn't integrated correctly — it was added as a runtime
dependency while it's meant to be a build dependency. This resulted in
0.0.0 being used all the time.

This patch adds a hatchling plugin that implements the original idea in
a way that actually works.

Author: webknjaz

hatch.toml

@@ -10,3 +10,10 @@ exclude = [
 packages = [
   'hooks/',
 ]
+
+[metadata.hooks.vcs.urls]
+'Source Archive' = 'https://github.com/antonbabenko/pre-commit-terraform/archive/{commit_hash}.tar.gz'
+'GitHub: repo' = 'https://github.com/antonbabenko/pre-commit-terraform'
+
+[version]
+source = 'vcs'

pyproject.toml

@@ -1,13 +1,12 @@
 [build-system]
 requires = [
   'hatchling',
+  'hatch-vcs',  # setuptools-scm
 ]
 build-backend = 'hatchling.build'
 
 [project]
 name = 'pre-commit-terraform'
-version = '0.0.0'
-# version_format = '{tag}+{gitsha}'
 classifiers = [
   'License :: OSI Approved :: MIT License',
   'Programming Language :: Python :: 2',
@@ -19,17 +18,16 @@ classifiers = [
   'Programming Language :: Python :: Implementation :: PyPy',
 ]
 description = 'Pre-commit hooks for terraform_docs_replace'
-dependencies = [
-  'setuptools-git-version',
+dependencies = []
+dynamic = [
+  'urls',
+  'version',
 ]
 
 [[project.authors]]
 name = 'Contributors'  # FIXME
 # email = 'степан@криївка.укр'
 
-[project.urls]
-'GitHub: repo' = 'https://github.com/antonbabenko/pre-commit-terraform'
-
 [project.readme]
 file = 'README.md'
 content-type = 'text/markdown'