Add Makefile

I finally took the time to properly learn how to write makefiles. This
was long overdue, but here we go.

Much of the makefile wraps `build.py`, but gradually, we'll extract
stuff from there until the makefile is the main container for build
logic.

Makefile

@@ -0,0 +1,69 @@
+PYTHON=python3
+REQ_MINOR_VERSION=4
+
+# Our build scripts are not very "make like" yet and perform their task in a bundle. For now, we
+# use one of each file to act as a representative, a target, of these groups.
+pemodules_target = core/pe/_block.*.so
+mofiles_target = locale/fr/LC_MESSAGES/core.mo
+submodules_target = hscommon/__init__.py
+
+pofiles = $(wildcard locale/*/LC_MESSAGES/*.po)
+
+.PHONY : default
+default : run.py
+	@echo "Build complete! You can run dupeGuru with 'make run'"
+
+run.py : env $(mofiles_target) $(pemodules_target) qt/dg_rc.py
+	cp qt/run_template.py run.py
+
+.PHONY : reqs
+reqs :
+	@ret=`${PYTHON} -c "import sys; print(int(sys.version_info[:2] >= (3, ${REQ_MINOR_VERSION})))"`; \
+		if [ $${ret} -ne 1 ]; then \
+			echo "Python 3.${REQ_MINOR_VERSION}+ required. Aborting."; \
+			exit 1; \
+		fi
+	@${PYTHON} -m venv -h > /dev/null || \
+		echo "Creation of our virtualenv failed. If you're on Ubuntu, you probably need python3-venv."
+	@${PYTHON} -c 'import PyQt5' >/dev/null 2>&1 || \
+		{ echo "PyQt 5.4+ required. Install it and try again. Aborting"; exit 1; }
+
+# Ensure that submodules are initialized
+$(submodules_target) :
+	git submodule init
+	git submodule update
+
+env : | $(submodules_target) reqs
+	@echo "Creating our virtualenv"
+	${PYTHON} -m venv env --system-site-packages
+	./env/bin/pip install -r requirements.txt
+
+build/help : | env
+	./env/bin/python build.py --doc
+
+qt/dg_rc.py : qt/dg.qrc
+	pyrcc5 qt/dg.qrc > qt/dg_rc.py
+
+$(mofiles_target) : $(pofiles) | env
+	./env/bin/python build.py --loc
+	
+$(pemodules_target) :
+	./env/bin/python -c 'import build; build.build_pe_modules("qt")'
+
+.PHONY : mergepot
+mergepot :
+	./env/bin/python build.py --mergepot
+
+.PHONY : normpo
+normpo :
+	./env/bin/python build.py --normpo
+
+.PHONY : run
+run: run.py
+	./env/bin/python run.py
+
+.PHONY : clean
+clean:
+	-rm run.py
+	-rm -rf build
+	-rm locale/*/LC_MESSAGES/*.mo

README.md

@@ -66,11 +66,26 @@ git submodules:
 
 ## How to build dupeGuru from source
 
+### make
+
+If you're on linux, you can build the ap for local development with `make`:
+
+    $ make
+    $ make run
+
+The `Makefile` is a recent addition, however. You might have to fallback to the legacy build
+scripts.
+
+### Legacy build
+
+If you're on OS X or that if the `make` method didn't work, you can build dupeGuru with the
+legacy scripts.
+
 There's a bootstrap script that will make building very easy. There might be some things that you
 need to install manually on your system, but the bootstrap script will tell you when what you need
 to install. You can run the bootstrap with:
 
-    ./bootstrap.sh
+    $ ./bootstrap.sh
 
 and follow instructions from the script.