refine conan requirements and packaging

conanfile.py

@@ -22,22 +22,39 @@ class NameofConan(ConanFile):
     exports_sources = ['example/*','include/*','test/*','CMakeLists.txt','LICENSE']
     exports = ['LICENSE.md']
     _build_subfolder = 'build_subfolder'
-    build_requires = 'Catch2/2.9.1@catchorg/stable'
+    settings = ('os', 'compiler', 'build_type', 'arch')
+    options = {
+        'build_tests': [True, False],
+        'build_examples': [True, False],
+    }
+    default_options = {
+        'build_tests': False,
+        'build_examples': False,
+    }
 
-    def configure_cmake(self, build_tests_and_examples):
+    def requirements(self):
+        if self.options.build_tests:
+            self.requires('Catch2/2.9.1@catchorg/stable')
+
+    def config_options(self):
+        needs_build = self.options.build_tests or self.options.build_examples
+        if not needs_build:
+            # remove all build settings since it is a header-only library
+            self.options.remove(['os', 'compiler', 'build_type', 'arch'])
+
+    def configure_cmake(self):
         cmake = CMake(self)
-        if self.develop:
+        cmake.definitions['NAMEOF_OPT_BUILD_TESTS'] = self.options.build_tests
-            self.output.info("Develop mode on, building with tests and examples")
+        cmake.definitions['NAMEOF_OPT_BUILD_EXAMPLES'] = self.options.build_examples
-        cmake.definitions['NAMEOF_OPT_BUILD_TESTS'] = build_tests_and_examples
-        cmake.definitions['NAMEOF_OPT_BUILD_EXAMPLES'] = build_tests_and_examples
         cmake.configure(build_folder=self._build_subfolder)
         return cmake
 
     def build(self):
-        cmake = self.configure_cmake(build_tests_and_examples = True)
+        cmake = self.configure_cmake()
         cmake.build()
+        if self.options.build_tests:
             cmake.test()
 
     def package(self):
-        cmake = self.configure_cmake(build_tests_and_examples = False)
+        cmake = self.configure_cmake()
         cmake.install()