Improve makefile rebuild caching

Makefile

@@ -1,23 +1,66 @@
-VENV=.venv
-.PHONY: all install clean distclean deps
+# Use bash for shell
+SHELL := /bin/bash
 
-all: deps
-	$(VENV)/bin/meson setup libvmaf/build libvmaf --buildtype release -Denable_float=true && \
-	$(VENV)/bin/ninja -vC libvmaf/build && \
-	cd python && \
-	../$(VENV)/bin/python setup.py build_ext --build-lib .
+# Path and environment setup
+VENV := .venv
+VIRTUAL_ENV_PATH := $(VENV)/bin
 
-install: deps
-	$(VENV)/bin/meson setup libvmaf/build libvmaf --buildtype release && \
-	$(VENV)/bin/ninja -vC libvmaf/build install
+# Build tools configured in the virtual environment
+PYTHON_INTERPRETER := python3.10
+VENV_PIP := $(VIRTUAL_ENV_PATH)/pip
+VENV_PYTHON := $(VIRTUAL_ENV_PATH)/python
+MESON_SETUP := $(VIRTUAL_ENV_PATH)/meson setup
+NINJA := $(VIRTUAL_ENV_PATH)/ninja
+
+# Build types and options
+BUILDTYPE_RELEASE := --buildtype release
+BUILDTYPE_DEBUG := --buildtype debug
+ENABLE_FLOAT := -Denable_float=true
+
+# Directories
+LIBVMAF_DIR := libvmaf
+BUILD_DIR := $(LIBVMAF_DIR)/build
+DEBUG_DIR := $(LIBVMAF_DIR)/debug
+
+.PHONY: default all debug build install cythonize clean distclean
+
+default: build
+
+all: build debug install test cythonize
+
+$(BUILD_DIR): $(VENV)
+	PATH="$(VENV)/bin:$$PATH" $(MESON_SETUP) $(BUILD_DIR) $(LIBVMAF_DIR) $(BUILDTYPE_RELEASE) $(ENABLE_FLOAT)
+
+$(DEBUG_DIR): $(VENV)
+	PATH="$(VENV)/bin:$$PATH" $(MESON_SETUP) $(DEBUG_DIR) $(LIBVMAF_DIR) $(BUILDTYPE_DEBUG) $(ENABLE_FLOAT)
+
+cythonize: $(VENV)
+	pushd python && ../$(VENV_PYTHON) setup.py build_ext --build-lib . && popd || exit 1
+
+build: $(BUILD_DIR) $(VENV)
+	PATH="$(VENV)/bin:$$PATH" $(NINJA) -vC $(BUILD_DIR)
+
+test: build $(VENV)
+	PATH="$(VENV)/bin:$$PATH" $(NINJA) -vC $(BUILD_DIR) test
+
+debug: $(DEBUG_DIR) $(VENV)
+	PATH="$(VENV)/bin:$$PATH" $(NINJA) -vC $(DEBUG_DIR)
+
+install: $(BUILD_DIR) $(VENV)
+	PATH="$(VENV)/bin:$$PATH" $(NINJA) -vC $(BUILD_DIR) install
 
 clean:
-	rm -rf libvmaf/build
+	rm -rf $(BUILD_DIR) $(DEBUG_DIR)
 	rm -f python/vmaf/core/adm_dwt2_cy.c*
 
 distclean: clean
 	rm -rf $(VENV)
 
-deps:
-	test -d $(VENV) || python3 -mvenv $(VENV)
-	$(VENV)/bin/pip install meson ninja cython numpy
+# Set up or rebuild virtual environment
+$(VENV):
+	@echo "Setting up the virtual environment..."
+	@set -e; \
+	$(PYTHON_INTERPRETER) -m venv $(VENV) || { echo "Failed to create virtual environment"; exit 1; }; \
+	$(VENV_PIP) install --upgrade pip || { echo "Failed to upgrade pip"; exit 1; }; \
+	$(VENV_PIP) install meson ninja cython numpy || { echo "Failed to install dependencies"; exit 1; }
+	@echo "Virtual environment setup complete."