conanfile.py

from conan import ConanFile
from conan.tools.cmake import CMake, CMakeToolchain, cmake_layout
from conan.tools.files import apply_conandata_patches, copy, export_conandata_patches, get, save
from conan.tools.scm import Version
import os
import textwrap

required_conan_version = ">=1.53.0"


class Bzip2Conan(ConanFile):
    name = "bzip2"
    url = "https://github.com/conan-io/conan-center-index"
    homepage = "https://sourceware.org/bzip2"
    license = "bzip2-1.0.6"
    description = "bzip2 is a free and open-source file compression program that uses the Burrows Wheeler algorithm."
    topics = ("data-compressor", "file-compression")
    package_type = "library"
    settings = "os", "arch", "compiler", "build_type"
    options = {
        "shared": [True, False],
        "fPIC": [True, False],
        "build_executable": [True, False],
    }
    default_options = {
        "shared": False,
        "fPIC": True,
        "build_executable": True,
    }

    def export_sources(self):
        copy(self, "CMakeLists.txt", self.recipe_folder, self.export_sources_folder)
        export_conandata_patches(self)

    def config_options(self):
        if self.settings.os == "Windows":
            del self.options.fPIC
        self.license = f"bzip2-{self.version}"

    def configure(self):
        if self.options.shared:
            self.options.rm_safe("fPIC")
        self.settings.compiler.rm_safe("libcxx")
        self.settings.compiler.rm_safe("cppstd")

    def layout(self):
        cmake_layout(self, src_folder="src")

    def source(self):
        get(self, **self.conan_data["sources"][self.version], strip_root=True)

    def generate(self):
        tc = CMakeToolchain(self)
        tc.variables["BZ2_BUILD_EXE"] = self.options.build_executable
        tc.variables["BZ2_SRC_DIR"] = self.source_folder.replace("\\", "/")
        tc.variables["BZ2_VERSION_MAJOR"] = Version(self.version).major
        tc.variables["BZ2_VERSION_STRING"] = self.version
        tc.generate()

    def build(self):
        apply_conandata_patches(self)
        cmake = CMake(self)
        cmake.configure(build_script_folder=os.path.join(self.source_folder, os.pardir))
        cmake.build()

    def package(self):
        copy(self, "LICENSE", src=self.source_folder, dst=os.path.join(self.package_folder, "licenses"))
        cmake = CMake(self)
        cmake.install()
        self._create_cmake_module_variables(
            os.path.join(self.package_folder, self._module_file_rel_path)
        )

    def _create_cmake_module_variables(self, module_file):
        content = textwrap.dedent(f"""\
            set(BZIP2_NEED_PREFIX TRUE)
            set(BZIP2_FOUND TRUE)
            if(NOT DEFINED BZIP2_INCLUDE_DIRS AND DEFINED BZip2_INCLUDE_DIRS)
                set(BZIP2_INCLUDE_DIRS ${{BZip2_INCLUDE_DIRS}})
            endif()
            if(NOT DEFINED BZIP2_INCLUDE_DIR AND DEFINED BZip2_INCLUDE_DIR)
                set(BZIP2_INCLUDE_DIR ${{BZip2_INCLUDE_DIR}})
            endif()
            if(NOT DEFINED BZIP2_LIBRARIES AND DEFINED BZip2_LIBRARIES)
                set(BZIP2_LIBRARIES ${{BZip2_LIBRARIES}})
            endif()
            set(BZIP2_VERSION_STRING "{self.version}")
        """)
        save(self, module_file, content)

    @property
    def _module_file_rel_path(self):
        return os.path.join("lib", "cmake", f"conan-official-{self.name}-variables.cmake")

    def package_info(self):
        self.cpp_info.set_property("cmake_find_mode", "both")
        self.cpp_info.set_property("cmake_file_name", "BZip2")
        self.cpp_info.set_property("cmake_target_name", "BZip2::BZip2")
        self.cpp_info.set_property("cmake_build_modules", [self._module_file_rel_path])
        self.cpp_info.libs = ["bz2"]

        self.cpp_info.names["cmake_find_package"] = "BZip2"
        self.cpp_info.names["cmake_find_package_multi"] = "BZip2"
        self.cpp_info.build_modules["cmake_find_package"] = [self._module_file_rel_path]
        if self.options.build_executable:
            self.env_info.PATH.append(os.path.join(self.package_folder, "bin"))