build(conan): Environment variables replaced with Conan configuration properties

conanfile.py

@@ -30,9 +30,6 @@ from conan.tools.files import copy, load, rmdir
 from conan.tools.scm import Version
 from conans.errors import ConanInvalidConfiguration
 
-# TODO remove when `CONAN_RUN_TESTS` will be replaced with a `[conf]` variable
-from conans.tools import get_env
-
 required_conan_version = ">=1.50.0"
 
 
@@ -57,8 +54,8 @@ class MPUnitsConan(ConanFile):
     url = "https://github.com/mpusz/units"
     settings = "os", "compiler", "build_type", "arch"
     requires = "gsl-lite/0.40.0"
-    options = {"downcast_mode": ["off", "on", "auto"], "build_docs": [True, False]}
-    default_options = {"downcast_mode": "on", "build_docs": True}
+    options = {"downcast_mode": ["off", "on", "auto"]}
+    default_options = {"downcast_mode": "on"}
     exports = ["LICENSE.md"]
     exports_sources = [
         "docs/*",
@@ -72,8 +69,12 @@ class MPUnitsConan(ConanFile):
     generators = "cmake_paths"
 
     @property
-    def _run_tests(self):
-        return get_env("CONAN_RUN_TESTS", False)
+    def _build_all(self):
+        return bool(self.conf["user.build:all"])
+
+    @property
+    def _skip_docs(self):
+        return bool(self.conf["user.build:skip_docs"])
 
     @property
     def _use_libfmt(self):
@@ -113,10 +114,10 @@ class MPUnitsConan(ConanFile):
             self.requires("range-v3/0.11.0")
 
     def build_requirements(self):
-        if self._run_tests:
+        if self._build_all:
             self.test_requires("catch2/2.13.9")
             self.test_requires("wg21-linear_algebra/0.7.2")
-            if self.options.build_docs:
+            if not self._skip_docs:
                 self.tool_requires("doxygen/1.9.4")
 
     # TODO Replace with `valdate()` for Conan 2.0 (https://github.com/conan-io/conan/issues/10723)
@@ -146,20 +147,13 @@ class MPUnitsConan(ConanFile):
             raise ConanInvalidConfiguration("Unsupported compiler")
         check_min_cppstd(self, 20)
 
-    # TODO Uncomment this when environment is supported in the Conan toolchain
-    # def config_options(self):
-    #     if not self._run_tests:
-    #         # build_docs has sense only in a development or CI build
-    #         del self.options.build_docs
-
     def layout(self):
         cmake_layout(self)
 
     def generate(self):
         tc = CMakeToolchain(self)
         tc.variables["UNITS_DOWNCAST_MODE"] = str(self.options.downcast_mode).upper()
-        # if self._run_tests:  # TODO Enable this when environment is supported in the Conan toolchain
-        tc.variables["UNITS_BUILD_DOCS"] = bool(self.options.build_docs)
+        tc.variables["UNITS_BUILD_DOCS"] = self._build_all and not self._skip_docs
         tc.variables["UNITS_USE_LIBFMT"] = self._use_libfmt
         tc.generate()
         deps = CMakeDeps(self)
@@ -167,9 +161,9 @@ class MPUnitsConan(ConanFile):
 
     def build(self):
         cmake = CMake(self)
-        cmake.configure(build_script_folder=None if self._run_tests else "src")
+        cmake.configure(build_script_folder=None if self._build_all else "src")
         cmake.build()
-        if self._run_tests:
+        if self._build_all:
             cmake.test()
 
     def package_id(self):