Use importlib.metadata for docs

Makefile

@@ -1,9 +1,7 @@
-PKG_VERSION   = $(shell cat VERSION)
 DOCS_FOLDER   = "docs"
 SOURCE_FOLDER = "madminer"
 TESTS_FOLDER  = "tests"
 
-
 .PHONY: build
 build:
 	@echo "Building package"
@@ -26,7 +24,8 @@ docs:
 .PHONY: tag
 tag:
 	@echo "Tagging current commit"
-	@git tag --annotate "v$(PKG_VERSION)" --message "Tag v$(PKG_VERSION)"
+	@git tag --annotate "v$(shell python -c 'from importlib.metadata import version; print(version("madminer"))')" \
+	--message "Tag v$(shell python -c 'from importlib.metadata import version; print(version("madminer"))')"
 	@git push --follow-tags
 
 

docs/conf.py

@@ -16,19 +16,21 @@
 # sys.path.insert(0, os.path.abspath('.'))
 
 from pathlib import Path
+import importlib.metadata
 
 # -- Project information -----------------------------------------------------
 
-project_folder = Path(__file__).parent.parent
-version_file = project_folder.joinpath("VERSION")
-
 project = 'MadMiner'
 authors = 'Johann Brehmer, Felix Kling, Irina Espejo, Sinclert Perez, Kyle Cranmer'
-version = open(version_file).read().strip()
 copyright = '{} 2018-2020'.format(authors)
 
-# The full version, including alpha/beta/rc tags
-release = version
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+# The full version, including alpha/beta/rc tags.
+release = importlib.metadata.version("madminer")
+# for example take major/minor/patch
+version = ".".join(release.split(".")[:3])
 
 
 # -- General configuration ---------------------------------------------------