Add read project lists

src/clippy/project_list.cpp

@@ -0,0 +1,57 @@
+#include <clippy/project_list.hpp>
+#include <filesystem>
+#include <utils/lock_file.hpp>
+
+#include <fstream>
+#include <mutex>
+
+
+
+
+
+
+#include <iostream>
+
+void ProjectList::LoadFrom(const std::string& path) {
+  utils::filesystem::LockFile lock(path);
+  std::lock_guard guard(lock);
+
+  std::ifstream in(path);
+
+  Project current;
+
+  while (in >> current.root_project >> current.configuration_file) {
+    projects_.push_back(current);
+  }
+}
+
+std::optional<Project> ProjectList::GetCurrentProject() {
+  auto current_path = std::filesystem::current_path();
+
+  std::optional<Project> result;
+  auto UpdateResult = [&result](Project p) {
+    if (!result.has_value()) {
+      result = p;
+    } else {
+      result = std::max(p, result.value());
+    }
+  };
+
+  for (auto& project : projects_) {
+    auto prefix_current_path = current_path;
+
+    if (project.root_project == "/") {
+      UpdateResult(project);
+      continue;
+    }
+
+    while (prefix_current_path != "/") {
+      if (prefix_current_path == project.root_project) {
+        UpdateResult(project);
+      }
+      prefix_current_path = prefix_current_path.parent_path();
+    }
+  }
+
+  return result;
+}