Add automated release and packaging

Automatically create a zip archive and GitHub release when running the 'release' target.

Makefile

@@ -1,8 +1,10 @@
-.PHONY: install list remove
+.PHONY: install list remove zip release bump-patch bump-minor bump-major
 
 PLUGIN_DIR = crosspoint_reader
 PLUGIN_NAME = CrossPoint Reader
 CALIBRE = /Applications/calibre.app/Contents/MacOS/calibre-customize
+VERSION = $(shell python3 -c "import re; m=re.search(r'version\s*=\s*\((\d+),\s*(\d+),\s*(\d+)\)', open('$(PLUGIN_DIR)/driver.py').read()); print(f'{m.group(1)}.{m.group(2)}.{m.group(3)}')")
+ZIP_NAME = $(PLUGIN_DIR)-v$(VERSION).zip
 
 install:
 	$(CALIBRE) -b $(PLUGIN_DIR)
@@ -12,3 +14,36 @@ list:
 
 remove:
 	$(CALIBRE) -r "$(PLUGIN_NAME)"
+
+zip:
+	@echo "Packaging $(PLUGIN_DIR) v$(VERSION)..."
+	rm -f $(ZIP_NAME)
+	cd $(PLUGIN_DIR) && zip -r ../$(ZIP_NAME) . -x '*.pyc' '__pycache__/*' '.DS_Store'
+	@echo "Created $(ZIP_NAME)"
+
+BUMP = python3 -c "\
+import re, sys; \
+part = sys.argv[1]; \
+f = '$(PLUGIN_DIR)/driver.py'; \
+txt = open(f).read(); \
+m = re.search(r'version\s*=\s*\((\d+),\s*(\d+),\s*(\d+)\)', txt); \
+M, m_, p = int(m.group(1)), int(m.group(2)), int(m.group(3)); \
+new = {'major': (M+1,0,0), 'minor': (M,m_+1,0), 'patch': (M,m_,p+1)}[part]; \
+open(f,'w').write(txt.replace(m.group(0), f'version = ({new[0]}, {new[1]}, {new[2]})')); \
+print(f'{M}.{m_}.{p} -> {new[0]}.{new[1]}.{new[2]}')"
+
+bump-patch:
+	@$(BUMP) patch
+
+bump-minor:
+	@$(BUMP) minor
+
+bump-major:
+	@$(BUMP) major
+
+release: zip
+	@echo "Creating GitHub release v$(VERSION)..."
+	gh release create "v$(VERSION)" $(ZIP_NAME) \
+		--title "$(PLUGIN_NAME) v$(VERSION)" \
+		--generate-notes
+	@echo "Released $(PLUGIN_NAME) v$(VERSION)"