From d0152079aed43a551b158da0e08801d35036d62e Mon Sep 17 00:00:00 2001
From: DSiekmeier <incubus84@web.de>
Date: Mon, 6 Nov 2023 10:01:35 +0100
Subject: [PATCH] (wip) feature: add diagnostic data to --version flag

---
 CMakeLists.txt           |  1 +
 src/cli.cc               | 18 ++++++++++++++++-
 src/sysinfoaggregator.cc | 42 ++++++++++++++++++++++++++++++++++++++++
 src/sysinfoaggregator.h  | 37 +++++++++++++++++++++++++++++++++++
 4 files changed, 97 insertions(+), 1 deletion(-)
 create mode 100644 src/sysinfoaggregator.cc
 create mode 100644 src/sysinfoaggregator.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 508b2e4..885daea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,7 @@ add_library(${PROJECT_NAME}-lib OBJECT
     src/details.cc
     src/library.cc
     src/statistics.cc
+    src/sysinfoaggregator.cc
     src/utilities.cc
 )
 
diff --git a/src/cli.cc b/src/cli.cc
index 40758af..6c8d68c 100644
--- a/src/cli.cc
+++ b/src/cli.cc
@@ -1,4 +1,5 @@
 #include "cli.h"
+#include "sysinfoaggregator.h"
 
 using namespace booktrack_cli;
 
@@ -10,7 +11,22 @@ void AddMainOptions(CLI::App& app, CliOptions& opt) {
     version_string << BOOKTRACK_CLI_VERSION_MAJOR << "."
                    << BOOKTRACK_CLI_VERSION_MINOR << "."
                    << BOOKTRACK_CLI_VERSION_PATCH;
-    return "booktrack-cli v" + version_string.str();
+    const auto booktrack_version =
+        "booktrack-cli v" + version_string.str() + '\n';
+
+    SysInfo system_information{"<invalid value>", "<invalid value>"};
+    try {
+      SysInfoAggregator sysinfo("/etc/os-release");
+      system_information = sysinfo.GetSysInfo();
+    } catch (const std::runtime_error& ex) {
+      std::cout << ex.what() << '\n';
+    }
+    const auto os_release_name =
+        "OS name   : " + system_information.os_release_name + '\n';
+    const auto os_release_version =
+        "OS version: " + system_information.os_release_version + '\n';
+
+    return booktrack_version + '\n' + os_release_name + os_release_version;
   });
 
   app.add_option("-l,--library,", opt.library_file_path,
diff --git a/src/sysinfoaggregator.cc b/src/sysinfoaggregator.cc
new file mode 100644
index 0000000..f721f2f
--- /dev/null
+++ b/src/sysinfoaggregator.cc
@@ -0,0 +1,42 @@
+#include <exception>
+#include <fstream>
+
+#include "sysinfoaggregator.h"
+using namespace booktrack_cli;
+
+SysInfo SysInfoAggregator::GetSysInfo() {
+  SysInfo value;
+  std::ifstream input_file{"/etc/os-release"};
+
+  if (input_file.good()) {
+    std::string line;
+    while (getline(input_file, line)) {
+      auto splitted = split_entries(line);
+      if (splitted[0] == "NAME") {
+        value.os_release_name = splitted[1];
+      }
+      if (splitted[0] == "VERSION") {
+        value.os_release_version = splitted[1];
+      }
+    }
+    input_file.close();
+  } else {
+    throw std::runtime_error("Could not open file.");
+  }
+
+  return value;
+}
+
+std::vector<std::string> SysInfoAggregator::split_entries(
+    const std::string& s) {
+  std::vector<std::string> result;
+  std::string::size_type start{0};
+  std::string::size_type position;
+  do {
+    position = s.find_first_of("=", start);
+    result.push_back(s.substr(start, position - start));
+    start = position + 1;
+  } while (position != std::string::npos);
+
+  return result;
+}
diff --git a/src/sysinfoaggregator.h b/src/sysinfoaggregator.h
new file mode 100644
index 0000000..71a710a
--- /dev/null
+++ b/src/sysinfoaggregator.h
@@ -0,0 +1,37 @@
+#ifndef BOOKTRACK_CLI_SYSINFOAGGREGATOR_H
+#define BOOKTRACK_CLI_SYSINFOAGGREGATOR_H
+
+#include <filesystem>
+#include <string>
+#include <vector>
+
+namespace fs = std::filesystem;
+
+namespace booktrack_cli {
+
+struct SysInfo {
+  std::string os_release_name;
+  std::string os_release_version;
+};
+
+class SysInfoAggregator {
+ public:
+  explicit SysInfoAggregator(fs::path release_file)
+      : release_file_{release_file} {};
+
+  /**
+   * @brief Get the Sys Info object
+   *
+   * @return SysInfo
+   * @throws std::runtime_error
+   */
+  SysInfo GetSysInfo();
+
+ private:
+  std::vector<std::string> split_entries(const std::string& s);
+
+  fs::path release_file_;
+};
+}  // namespace booktrack_cli
+
+#endif