# SPDX-License-Identifier: Apache-2.0
# fastfetch -- system information, MIT: https://github.com/fastfetch-cli/fastfetch
#
# Here because it is a good acceptance test, not because SchOS needs a fetch
# tool. It is ~410 C files somebody else wrote, against Linux rather than
# against our bugs, and running it exercises procfs, per-process directories,
# uname, statfs, getpwuid, terminal detection by walking ppid, and an ANSI
# renderer -- all at once, and it notices when any of them lies.
#
# **It is built unpatched.** patches/ is empty and should stay that way: when
# fastfetch cannot detect something the right answer is to give the system the
# thing it is looking for, because every other program looks for the same
# things. What it could not find on the first run became work in the kernel and
# in sysroot/etc, not sed lines here.

include ../mk/port.mk

FF_VERSION := 2.30.0
FF_URL     := https://github.com/fastfetch-cli/fastfetch/archive/refs/tags/$(FF_VERSION).tar.gz
FF_SHA256  := 5047f925e480e065e8b28da1e6cc5b31ffdc1ad205ec74a9ea709fb5bcaacd8a

TARBALL := $(DISTDIR)/fastfetch-$(FF_VERSION).tar.gz

# Linux UAPI headers. musl deliberately ships none -- a musl toolchain is
# normally paired with a separate linux-headers install -- and fastfetch's
# Linux detection includes linux/ethtool.h and friends directly. Overridable
# because the path is a property of the build host, not of this port.
LINUX_HEADERS ?= $(shell for d in /usr/include /nix/store/*-linux-headers-*/include; do \
                          test -f "$$d/linux/ethtool.h" && { echo "$$d"; break; }; done)

# gcc rather than port.mk's clang: this is the one port whose upstream expects
# a GNU-ish driver, and the two disagree about -print-libgcc-file-name.
HOSTCC_FF ?= gcc

# The compiler's own headers, which -nostdinc also removes. cpuid.h lives here,
# not in libc: it is emitted by the compiler and has no musl equivalent.
GCC_INC   := $(shell $(HOSTCC_FF) -print-file-name=include)
LIBGCC    := $(shell $(HOSTCC_FF) -print-libgcc-file-name)

# Every optional feature off. All 29 files that call dlopen are in optional
# detection modules, and ENABLE_THREADS=OFF removes the single pthread_create --
# which matters because SchOS's clone() does not share an address space.
FF_OFF := VULKAN WAYLAND XCB_RANDR XCB XRANDR X11 DRM DRM_AMDGPU GIO DCONF \
          DBUS XFCONF SQLITE3 RPM IMAGEMAGICK7 IMAGEMAGICK6 CHAFA ZLIB EGL \
          GLX OSMESA OPENCL FREETYPE PULSE DDCUTIL DIRECTX_HEADERS ELF \
          THREADS LIBZFS PCIACCESS SYSTEM_YYJSON LTO

$(TARBALL): | $(DISTDIR)
	curl -fsSL -o $@ $(FF_URL)
	sh $(SHA256CHECK) "$(FF_SHA256)" "$@"

download: $(TARBALL)

$(SRCDIR): $(TARBALL)
	mkdir -p $(PORTDIR)
	tar -xzf $< -C $(PORTDIR)
	mv $(PORTDIR)/fastfetch-$(FF_VERSION) $@

extract: $(SRCDIR)

# A toolchain file rather than a pile of -D flags on the command line: CMake
# only honours CMAKE_*_INIT variables when it creates the cache, so they have to
# be in place before the first configure. Reconfiguring an existing build
# directory silently ignores them, which costs an afternoon to notice.
$(BUILDDIR)/toolchain.cmake: | $(SRCDIR)
	@mkdir -p $(BUILDDIR)
	@test -n "$(LINUX_HEADERS)" || { \
	  echo "fastfetch: no linux/ethtool.h found -- set LINUX_HEADERS=" >&2; exit 1; }
	@printf '%s\n' \
	  'set(CMAKE_SYSTEM_NAME Linux)' \
	  'set(CMAKE_SYSTEM_PROCESSOR x86_64)' \
	  'set(CMAKE_C_COMPILER $(HOSTCC_FF))' \
	  'set(CMAKE_C_FLAGS_INIT "-nostdinc -isystem $(LINUX_HEADERS) -isystem $(GCC_INC) -isystem $(MUSL)/include -D__SCHOS__ $(CFLAGS_BT)")' \
	  'set(CMAKE_EXE_LINKER_FLAGS_INIT "-static -nostdlib -L$(MUSL)/lib $(MUSL)/lib/crt1.o $(MUSL)/lib/crti.o")' \
	  'set(CMAKE_C_STANDARD_LIBRARIES "$(MUSL)/lib/libc.a $(LIBGCC) $(MUSL)/lib/libc.a $(MUSL)/lib/crtn.o")' \
	  'set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)' \
	  > $@

# libc appears twice on the link line on purpose: libgcc pulls symbols back out
# of it (__popcountdi2 is the one that shows up), and a static link resolves
# left to right.
$(BUILDDIR)/fastfetch: $(BUILDDIR)/toolchain.cmake
	cd $(BUILDDIR) && cmake $(SRCDIR) \
	    -DCMAKE_TOOLCHAIN_FILE=$(BUILDDIR)/toolchain.cmake \
	    -DCMAKE_BUILD_TYPE=Release \
	    $(foreach o,$(FF_OFF),-DENABLE_$(o)=OFF)
	$(MAKE) -C $(BUILDDIR) fastfetch

build: $(BUILDDIR)/fastfetch

install: $(BUILDDIR)/fastfetch | $(SYSROOT)/bin
	install -m 0755 $(BUILDDIR)/fastfetch $(SYSROOT)/bin/fastfetch

clean:
	rm -rf $(PORTDIR)

distclean: clean
	rm -f $(TARBALL)