prepare for distribution

Makefile

@@ -19,12 +19,22 @@ uninstall:
 test:
 	python3 tests/test_icnsutil.py
 
+dist-env:
+	@echo Creating virtual environment...
+	@python3 -m venv 'dist-env'
+	@source dist-env/bin/activate && pip install twine
+
 .PHONY: dist
-dist:
-	@python3 setup.py sdist --formats=tar bdist_wheel \
-	|| echo '-> you can not do this inside a virtual environment.'
+dist: dist-env
+	[ -z "$${VIRTUAL_ENV}" ]  # you can not do this inside a virtual environment.
+	rm -rf dist
+	@echo Building...
+	python3 setup.py sdist bdist_wheel
 	@echo
 	rm -rf ./*.egg-info/ ./build/ MANIFEST
+	@echo Publishing...
+	@echo "\033[0;31mEnter your PyPI token:\033[0m"
+	@source dist-env/bin/activate && export TWINE_USERNAME='__token__' && twine upload dist/*
 
 _icns_list.txt:
 	@echo 'Generate list of system icns files...'