# -*- mode: makefile; coding: utf-8 -*-
#
# Needs GNU make (aka gmake) and binutils/ar or LLVM/ar
# (instead of FreeBSD /usr/bin/ar).
#
# Building against an installed mupdf package fails because the libmupdfcpp.so
# is missing.
#
# Prepare:
#
# - Create a Python  venv and activate it
#
# - Install a LLVM package that has the same version as the libclang
#   Python package that will be used/installed
#   (e.g. pkg install llvm18 because of libclang>=18,<19)
#
# - In the "bin"-directory of the venv symlink "make" to /usr/local/bin/gmake
#   and "ar" to /usr/local/llvm18/bin/llvm-ar
#
#   * Makefiles have GNU syntax
#   * ar is called with @-response-files -- which are a GNU feature (also
#     implemented by LLVM's ar)
#
# - At first to not build with tesseract (OCR)
#
#     export PYMUPDF_SETUP_MUPDF_TESSERACT=0
#

.PHONY: build populate-venv

THIS_MAKEFILE_JUSTNAME:=	$(firstword $(MAKEFILE_LIST))
THIS_MAKEFILE_DIR:=		$(abspath $(dir $(THIS_MAKEFILE_JUSTNAME)))

PYMUPDF_SETUP_MUPDF_BUILD?=	$(THIS_MAKEFILE_DIR)/mupdf-source
PYMUPDF_SETUP_MUPDF_TESSERACT?=	0
LIBCLANG_LIBRARY_PATH?=		$(CLANG_DIR)/lib

TEST=				/bin/test
LOCALBASE?=			/usr/local
SYMLINK?=			/bin/ln -s
PYTHON?=			python3
PYTHON_PREFIXES!=		$(PYTHON) -c 'import sys; print(sys.prefix); print(sys.base_prefix)'
CLANG_DIR?=			/usr/local/llvm18

#
# Setting these does not work for some parts built by sub-makes.
# Symlink in the venv instead.
#
#CC=	$(CLANG_DIR)/bin/clang
#CXX=	$(CLANG_DIR)/bin/clang++

build:
ifneq ($(firstword $(PYTHON_PREFIXES)),$(lastword $(PYTHON_PREFIXES)))
	$(TEST) -e $(firstword $(PYTHON_PREFIXES))/bin/make || $(SYMLINK) $(LOCALBASE)/bin/gmake $(firstword $(PYTHON_PREFIXES))/bin/make
#	$(TEST) -e $(firstword $(PYTHON_PREFIXES))/bin/ar || $(SYMLINK) $(LOCALBASE)/bin/ar $(firstword $(PYTHON_PREFIXES))/bin/ar
	$(TEST) -e $(firstword $(PYTHON_PREFIXES))/bin/ar || $(SYMLINK) $(CLANG_DIR)/bin/llvm-ar $(firstword $(PYTHON_PREFIXES))/bin/ar
	$(TEST) -e $(firstword $(PYTHON_PREFIXES))/bin/cc || $(SYMLINK) $(CLANG_DIR)/bin/clang $(firstword $(PYTHON_PREFIXES))/bin/cc
	$(TEST) -e $(firstword $(PYTHON_PREFIXES))/bin/c++ || $(SYMLINK) $(CLANG_DIR)/bin/clang++ $(firstword $(PYTHON_PREFIXES))/bin/c++
	$(TEST) -e $(firstword $(PYTHON_PREFIXES))/bin/ld || $(SYMLINK) $(CLANG_DIR)/bin/ld.lld $(firstword $(PYTHON_PREFIXES))/bin/ld
	PIPCL_VERBOSE=2 LIBCLANG_LIBRARY_PATH=$(LIBCLANG_LIBRARY_PATH) PYMUPDF_SETUP_MUPDF_BUILD=$(PYMUPDF_SETUP_MUPDF_BUILD) PYMUPDF_SETUP_MUPDF_TESSERACT=$(PYMUPDF_SETUP_MUPDF_TESSERACT) $(PYTHON) -m build --wheel --verbose --no-isolation
else
	$(error Not in a Python virtual environment)
endif


populate-venv:
ifneq ($(firstword $(PYTHON_PREFIXES)),$(lastword $(PYTHON_PREFIXES)))
	$(PYTHON) -m pip install -U -r requirements-build.txt
else
	$(error Not in a Python virtual environment)
endif