From bed7360063629c9949cc188c432c566b8a972ce4 Mon Sep 17 00:00:00 2001
From: Tobias Schmidl <tobias@schmidl.dev>
Date: Mon, 16 Jun 2025 21:22:22 +0200
Subject: [PATCH] feat: first working set

---
 include/glimpses/glimpses.hpp | 35 ++++++++++++++++++++++++++---------
 source/glimpses.cpp           | 20 +++++++++++++++++++-
 test/CMakeLists.txt           | 13 ++++++-------
 test/source/glimpses.cpp      | 19 ++++++++-----------
 test/source/main.cpp          | 14 --------------
 5 files changed, 59 insertions(+), 42 deletions(-)
 delete mode 100644 test/source/main.cpp

diff --git a/include/glimpses/glimpses.hpp b/include/glimpses/glimpses.hpp
index 7d8fc02..eeed973 100644
--- a/include/glimpses/glimpses.hpp
+++ b/include/glimpses/glimpses.hpp
@@ -4,22 +4,39 @@
 
 #pragma once
 
+#include <cstdint>
+#include <map>
 #include <string>
 
-namespace glimpses {
+#include "glimpses/version.h"
 
-/**
- * @brief A class for saying hello in multiple languages
- */
-class Glimpses
+namespace glimpses
 {
 
+/** @brief A class for saying retrieving system information */
+class Glimpses
+{
   public:
-    /**
-     * @brief Creates a new glimpses
-     * @param name the name to greet
-     */
+    /** @brief Type for representing the number of CPU cores. */
+    using CPUCount = uint32_t;
+
+    /** @brief Type for representing a set of CPU cores, mapped by their names. */
+    using CPUSet = std::map<std::string, CPUCount>;
+
+    /** @brief Maximum number of CPU cores supported by Glimpses. */
+    constexpr static CPUCount MAX_CPU_COUNT = 1024;
+
+    /** @brief Version of the Glimpses library. */
+    constexpr static const char *VERSION = GLIMPSES_VERSION;
+
+    /** @brief Creates a new glimpses */
     Glimpses();
+
+    /**
+     * @brief Returns the number of CPU cores available on the system.
+     * @return The number of CPU cores available on the system.
+     */
+    CPUSet getCPUCount() const;
 };
 
 } // namespace glimpses
diff --git a/source/glimpses.cpp b/source/glimpses.cpp
index 80aed49..b7071c0 100644
--- a/source/glimpses.cpp
+++ b/source/glimpses.cpp
@@ -3,7 +3,25 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
 #include <glimpses/glimpses.hpp>
+#include <sched.h>
+#include <thread>
+#include <unistd.h>
 
 using namespace glimpses;
 
-Glimpses::Glimpses() {}
+Glimpses::Glimpses()
+{
+}
+
+Glimpses::CPUSet Glimpses::getCPUCount() const
+{
+    cpu_set_t cpuset;
+    auto minmax = [](int64_t min, int64_t value, int64_t max) -> CPUCount {
+        return std::min(std::max(value, min), max);
+    };
+    sched_getaffinity(0, sizeof(cpuset), &cpuset);
+    return CPUSet{{"configured", minmax(0, sysconf(_SC_NPROCESSORS_CONF), MAX_CPU_COUNT)},
+                  {"logical", minmax(0, std::thread::hardware_concurrency(), MAX_CPU_COUNT)},
+                  {"online", minmax(0, sysconf(_SC_NPROCESSORS_ONLN), MAX_CPU_COUNT)},
+                  {"allowed", minmax(0, CPU_COUNT(&cpuset), MAX_CPU_COUNT)}};
+}
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0bf5ae3..29beb72 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -18,8 +18,8 @@ include(../cmake/tools.cmake)
 
 include(../cmake/get_cpm.cmake)
 
-# CPMAddPackage("gh:doctest/doctest@2.4.9")
-CPMAddPackage("gh:TheLartians/Format.cmake@1.7.3")
+CPMAddPackage(NAME Catch2 GITHUB_REPOSITORY catchorg/Catch2 VERSION 3.8.1)
+CPMAddPackage("gh:TheLartians/Format.cmake@1.8.3")
 
 if(TEST_INSTALLED_VERSION)
 	find_package(Glimpses REQUIRED)
@@ -31,11 +31,7 @@ endif()
 
 file(GLOB sources CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp)
 add_executable(${PROJECT_NAME} ${sources})
-target_link_libraries(
-	${PROJECT_NAME}
-	# doctest::doctest
-	Glimpses::Glimpses
-)
+target_link_libraries(${PROJECT_NAME} Catch2::Catch2WithMain Glimpses::Glimpses)
 set_target_properties(${PROJECT_NAME} PROPERTIES CXX_STANDARD 17)
 
 # enable compiler warnings
@@ -52,6 +48,9 @@ endif()
 
 enable_testing()
 
+include(CTest)
+add_test(GlimpsesTests GlimpsesTests)
+
 # Note: doctest and similar testing frameworks can automatically configure CMake tests. For other testing frameworks add the tests target
 # instead: add_test(NAME ${PROJECT_NAME} COMMAND ${PROJECT_NAME})
 
diff --git a/test/source/glimpses.cpp b/test/source/glimpses.cpp
index 82e9090..29caf68 100644
--- a/test/source/glimpses.cpp
+++ b/test/source/glimpses.cpp
@@ -2,24 +2,21 @@
 //
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+#include <catch2/catch_test_macros.hpp>
 #include <glimpses/glimpses.hpp>
 #include <glimpses/version.h>
-
 #include <string>
-/*
-TEST_CASE("Glimpses") {
-  using namespace greeter;
 
-  Glimpses greeter("Tests");
+TEST_CASE("CPU count")
+{
 
-  CHECK(greeter.greet(LanguageCode::EN) == "Hello, Tests!");
-  CHECK(greeter.greet(LanguageCode::DE) == "Hallo Tests!");
-  CHECK(greeter.greet(LanguageCode::ES) == "¡Hola Tests!");
-  CHECK(greeter.greet(LanguageCode::FR) == "Bonjour Tests!");
+    glimpses::Glimpses glimpses{};
+
+    CHECK(glimpses.getCPUCount().size() > 0);
 }
 
-TEST_CASE("Glimpses version") {
-  static_assert(std::string_view(GREETER_VERSION) == std::string_view("1.0"));
+/*
+TEST_CASE("Glimpses version") {  static_assert(std::string_view(GREETER_VERSION) == std::string_view("0.1.0"));
   CHECK(std::string(GREETER_VERSION) == std::string("1.0"));
 }
 */
diff --git a/test/source/main.cpp b/test/source/main.cpp
deleted file mode 100644
index ef34b77..0000000
--- a/test/source/main.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Tobias Schmidl
-//
-// SPDX-License-Identifier: AGPL-3.0-or-later
-#if 0
-#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
-
-#include <doctest/doctest.h>
-#endif
-
-int
-main()
-{
-    return 0;
-}