Cleaned up Makefile [CI SKIP]

Makefile

@@ -1,27 +1,28 @@
 # =====CONFIG=====
-# Devop environment runs in 3.8
-# TODO switch this to python3.6
-PYTHON=python3.6
+PYTHON := python3.6
+VENV   := .venv
 
 
 # =====RECIPES=====
-.venv/bin/activate: setup.py
-	'$(PYTHON)' -m venv .venv
-	.venv/bin/pip install -e .[develop]
+# Create the virtual environment
+$(VENV)/bin/activate: setup.py
+	'$(PYTHON)' -m venv '$(VENV)'
+	'$(VENV)/bin/pip' install -e .[develop]
 
-venv: .venv/bin/activate
+venv: $(VENV)/bin/activate
 .PHONY: venv
 
+# Format the codebase using Black
 format: venv
-	@ .venv/bin/black setup.py app/*.py app/**/*.py
+	@ '$(VENV)/bin/black' setup.py app/*.py app/**/*.py
 .PHONY: format
 
+# Remove any temporary files
 clean:
-	rm -rf .venv
-	rm -rf .tox
-	rm backup_tool
+	@ rm -rf '$(VENV)' .tox backup_tool
 .PHONY: clean
 
+# Pack the package into a zipfile
 backup_tool:
 	@ cd app && \
 		zip -r ../app.zip * \
@@ -33,6 +34,7 @@ backup_tool:
 app: backup_tool
 .PHONY: app
 
+# Install the app
 install: app
 	cp backup_tool /usr/local/bin
 .PHONY: install
@@ -40,9 +42,9 @@ install: app
 # We can't force the develop to have all the versions locally, so
 # the local tests only include python3.6
 test: venv tox.ini
-	@ .venv/bin/tox -e py36
+	@ '$(VENV)/bin/tox' -e py36
 .PHONY: test
 
 lint: venv
-	@ .venv/bin/tox -e lint
+	@ '$(VENV)/bin/tox' -e lint
 .PHONY: lint