hpp-proto/conanfile.py at main · huangminghuang/hpp-proto · GitHub

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from conan import ConanFile
from conan.tools.cmake import CMake, CMakeDeps, CMakeToolchain, cmake_layout
from conan.tools.build import check_min_cppstd
import os


class HppProtoConan(ConanFile):
    name = "hpp_proto"
    version = "1.0.0"
    license = "Apache-2.0"
    url = "https://github.com/huangminghuang/hpp-proto"
    description = "A modern C++23 implementation of Protocol Buffers."
    topics = ("protobuf", "serialization", "codegen")
    settings = ("os", "compiler", "build_type", "arch")
    options = {
        "tests": [True, False],
        "with_protobuf": [True, False],
    }
    default_options = {
        "tests": False,
        "with_protobuf": False,
    }
    exports_sources = (
        "CMakeLists.txt",
        "cmake/*",
        "hpp_proto-config.cmake.in",
        "third-parties.cmake",
        "include/*",
        "src/*",
        "tests/*",
        "tutorial/*",
        "LICENSE",
        "README.md",
    )

    def _cmake_path(self, exe_path, add_exe_suffix=False):
        if exe_path is None:
            return None
        suffix = ""
        if add_exe_suffix and str(self.settings.os) == "Windows":
            suffix = ".exe"
        return (exe_path + suffix).replace("\\", "/")

    def validate(self):
        cppstd = self.settings.get_safe("compiler.cppstd")
        if cppstd is not None:
            check_min_cppstd(self, "23")

    def requirements(self):
        self.requires("glaze/7.8.4")

    def build_requirements(self):
        self.protoc_mode = self.conf.get("user.hpp_proto:protoc", default="find")
        if self.options.with_protobuf:
            self.tool_requires("protobuf/[>=3.21.12]")

    def layout(self):
        cmake_layout(self)

    def generate(self):
        deps = CMakeDeps(self)
        deps.generate()
        tc = CMakeToolchain(self)
        tc.variables["HPP_PROTO_TESTS"] = "ON" if self.options.tests else "OFF"
        tc.variables["HPP_PROTO_PROTOC"] = self.protoc_mode
        self.protoc_executable = None
        if self.options.with_protobuf:
            protobuf_dep = self.dependencies.build.get("protobuf")
            if protobuf_dep is not None:
                protoc_path = os.path.join(protobuf_dep.package_folder, "bin", "protoc")
                self.protoc_executable = self._cmake_path(protoc_path, add_exe_suffix=True)
                if os.path.isfile(self.protoc_executable):
                    tc.variables["PROTOC_PROGRAM"] = self.protoc_executable
                else:
                    self.protoc_executable = None
        tc.variables["CPM_USE_LOCAL_PACKAGES"] = "ON"
        tc.generate()

    def build(self):
        cmake = CMake(self)
        cmake.configure()
        cmake.build()

    def package(self):
        cmake = CMake(self)
        cmake.install()
        cmake_config_folder = os.path.join(self.package_folder, "lib", "cmake", "hpp_proto")
        src_cmake_folder = os.path.join(self.source_folder, "cmake")

        src = os.path.join(src_cmake_folder, "conan_protoc_target.cmake")
        dest = os.path.join(cmake_config_folder, "conan_protoc_target.cmake")
        with open(src, "r", encoding="utf-8") as handle:
            existing = handle.read()
        with open(dest, "w", encoding="utf-8") as handle:
            content = []
            if self.protoc_executable:
                content.append(f"set(PROTOC_PROGRAM \"{self.protoc_executable}\")")
            protoc_gen_hpp_path = os.path.join(
                self.package_folder, "bin", "protoc-gen-hpp"
            )
            cmake_protoc_gen_hpp_path = self._cmake_path(protoc_gen_hpp_path, add_exe_suffix=True)
            content.append(f"set(PROTOC_GEN_HPP_PROGRAM \"{cmake_protoc_gen_hpp_path}\")")
            content.append(existing)
            handle.write("\n".join(content))

    def package_info(self):
        self.cpp_info.set_property("cmake_target_name", "hpp_proto::hpp_proto")

        core = self.cpp_info.components["core"]
        core.libs = ["is_utf8"]
        core.set_property("cmake_target_name", "hpp_proto::hpp_proto_core")
        core.requires = ["glaze::glaze"]

        well_known_types = self.cpp_info.components["well_known_types"]
        well_known_types.set_property("cmake_target_name", "hpp_proto::well_known_types")
        well_known_types.requires = ["core"]

        descriptor_lib = self.cpp_info.components["descriptor_lib"]
        descriptor_lib.set_property("cmake_target_name", "hpp_proto::descriptor_lib")
        descriptor_lib.requires = ["core"]

        self.cpp_info.requires = ["core", "well_known_types", "descriptor_lib"]

        dynamic_message = self.cpp_info.components["dynamic_message"]
        dynamic_message.libs = ["dynamic_message"]
        dynamic_message.set_property("cmake_target_name", "hpp_proto::dynamic_message")
        dynamic_message.requires = ["core", "well_known_types", "glaze::glaze"]

        self.cpp_info.set_property(
            "cmake_build_modules",
            ["lib/cmake/hpp_proto/conan_protoc_target.cmake",
             "lib/cmake/hpp_proto/protobuf_generate_hpp.cmake"],
        )

        self.cpp_info.set_property("cmake_file_name", "hpp_proto")