started changes

.gitignore

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+# OS junk
+.DS_Store
+Thumbs.db
+
+# Editor settings
+.vscode/**
+.idea/**
+*.swp
+*.swo
+.claude/**
+# Build system metadata (keep actual build dirs tracked)
+CMakeFiles/**
+CMakeCache.txt
+cmake_install.cmake
+Makefile
+compile_commands.json
+
+# Logs and temp files
+*.log
+*.tmp
+*.bak
+*.old
+
+build/**
+*.toml
+.cache/**
+
+
+**/*.aux
+**/*.fdb_latexmk
+**/*.fls
+**/*.log
+**/*.synctex.gz
+**/*.blg
+**/*.bcf
+**/*.run.xml
+**/*.bbl

.gitmodules

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+[submodule "external/spdlog"]
+	path = external/spdlog
+	url = https://github.com/gabime/spdlog.git

.opencode/AGENTS.md

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+# Project Agent Guidelines
+
+## Build, Lint, and Test Commands
+
+### Build Commands
+```bash
+# Create build directory and configure
+mkdir -p build && cd build && cmake ..
+
+# Build all targets
+make
+
+# Build specific target
+make <target_name>
+
+# Build with specific configuration
+make Release
+```
+
+### Lint Commands
+```bash
+# C++ linting with clang-tidy (if available)
+clang-tidy src/*.cpp -- -std=c++23 -I include/
+
+# C++ formatting with clang-format
+clang-format -i src/*.cpp include/*.h
+```
+
+### Test Commands
+```bash
+# Run all tests (if any exist)
+make test
+
+# Run a single test (if using a testing framework like Google Test)
+./build/<test_name>
+
+# For CMake-based projects with tests
+ctest -R <test_regex>
+```
+
+## Code Style Guidelines
+
+### General
+- Use C++23 standard features
+- Follow Google C++ Style Guide principles
+- Keep functions small and focused
+- Use meaningful, descriptive names
+- Write clear, self-documenting code
+- Add comments for complex logic
+
+### Naming Conventions
+- Classes: PascalCase (e.g., `MyClass`)
+- Functions: camelCase (e.g., `calculateSum`)
+- Variables: camelCase (e.g., `myVariable`)
+- Constants: UPPER_SNAKE_CASE (e.g., `MAX_SIZE`)
+- Files: snake_case (e.g., `my_file.cpp`)
+
+### Imports and Includes
+- Use angle brackets for system headers: `#include <iostream>`
+- Use quotes for local headers: `#include "my_header.h"`
+- Order includes: system headers, then local headers
+- Avoid `using namespace` in headers
+- Use forward declarations when possible
+
+### Formatting
+- Use 2-space indentation (no tabs)
+- No trailing whitespace
+- Single space around operators
+- Function parameters on same line if short, otherwise one parameter per line
+- Braces on same line for functions, new line for control structures
+
+### Types
+- Use `auto` when type is obvious from initialization
+- Prefer `const` and `constexpr` for immutable values
+- Use smart pointers (`std::unique_ptr`, `std::shared_ptr`) instead of raw pointers
+- Use `std::optional` for optional values
+- Use `std::string_view` for string views
+
+### Error Handling
+- Use exceptions for error conditions
+- Prefer RAII for resource management
+- Use `std::optional` or `std::expected` for operations that can fail
+- Don't ignore return values of functions that can fail
+
+### Code Structure
+- Keep lines under 100 characters
+- Separate logical sections with blank lines
+- Group related functions together
+- Use namespaces to avoid naming conflicts
+- Break large functions into smaller, reusable components

.opencode/cmake-plan.md

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+# CMake 2026 Project Setup Plan
+
+## Overview
+This document outlines the technical plan for setting up a CMake-based C++ project with the following requirements:
+- clang++ compiler with C++23 defaults
+- Automatic source file discovery in src/ directory
+- Executable generation from files containing 'main' in filename
+- External dependency handling for git submodules
+- Organized compile flags and variables
+
+## Key Components
+
+### 1. Compiler Configuration
+- Use clang++ as the C++ compiler
+- Set C++ standard to C++23
+- Configure appropriate compiler flags for clang
+
+### 2. Source File Discovery
+- Scan src/ directory for all .cpp files
+- Use regex pattern `.*main.*\.cpp$` to identify main files
+- Separate main files from other source files
+
+### 3. Executable Generation
+- Automatically create executables from files with 'main' in filename
+- Create a library from all non-main source files
+- Link the library to each executable
+
+### 4. External Dependency Management
+- Handle dependencies in external/ directory
+- Example: spdlog in external/spdlog with namespace spdlog
+- Create interface libraries for external dependencies
+
+### 5. Compile Flags Organization
+- Debug build flags: -g -O0 -Wall -Wextra
+- Release build flags: -O3 -DNDEBUG -Wall -Wextra
+- Common flags: -std=c++23 -fPIC
+
+## Implementation Details
+
+### Regex Pattern
+```
+.*main.*\.cpp$
+```
+Used to detect files containing 'main' in their filename.
+
+### Directory Structure
+- `src/` - Source files directory
+- `external/` - Git submodules directory
+- `include/` - Header files directory
+
+### File Processing Logic
+1. Find all .cpp files in src/
+2. Separate main files from other source files
+3. Create library from non-main files
+4. Generate executables from main files
+5. Link library and external dependencies to each executable
+
+## CMake Commands Used
+- `cmake_minimum_required(VERSION 3.15)`
+- `project(ProjectEuler CXX)`
+- `file(GLOB_RECURSE)`
+- `list(APPEND)`
+- `add_executable()`
+- `add_library()`
+- `target_link_libraries()`
+- `target_compile_features()`
+- `find_package()`
+- `add_subdirectory()`

CMakeLists.txt

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+# CMakeLists.txt
+cmake_minimum_required(VERSION 3.15)
+project(ProjectEuler CXX)
+
+# Set C++ standard to C++23
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+# Use system default C++ compiler
+# set(CMAKE_CXX_COMPILER clang++)
+
+# Set compile flags
+set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wextra")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG -Wall -Wextra")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++23 -fPIC")
+
+# Find required packages
+find_package(PkgConfig REQUIRED)
+find_package(Threads REQUIRED)
+
+# Include directories
+include_directories(${CMAKE_SOURCE_DIR}/include)
+
+# Add spdlog as a subdirectory
+add_subdirectory(external/spdlog)
+
+# Find all cpp files in src directory
+file(GLOB_RECURSE ALL_SOURCE_FILES "src/*.cpp")
+
+# Separate main files from other source files
+set(NON_MAIN_SOURCE_FILES "")
+set(MAIN_SOURCE_FILES "")
+
+foreach(file ${ALL_SOURCE_FILES})
+    # Check if file name contains 'main'
+    if(file MATCHES ".*main.*\\.cpp$")
+        list(APPEND MAIN_SOURCE_FILES ${file})
+    else()
+        list(APPEND NON_MAIN_SOURCE_FILES ${file})
+    endif()
+endforeach()
+
+# Create a library from non-main source files
+if(NON_MAIN_SOURCE_FILES)
+    add_library(project_euler_lib ${NON_MAIN_SOURCE_FILES})
+    target_link_libraries(project_euler_lib spdlog::spdlog)
+    target_compile_features(project_euler_lib PRIVATE cxx_std_23)
+endif()
+
+# Create executables from main files
+foreach(file ${MAIN_SOURCE_FILES})
+    # Get the filename without extension
+    get_filename_component(EXEC_NAME ${file} NAME_WE)
+    
+    # Create executable with project prefix
+    set(FINAL_EXEC_NAME "ProjectEuler_${EXEC_NAME}")
+    add_executable(${FINAL_EXEC_NAME} ${file})
+    
+    # Link the library to executable (if it exists)
+    if(NON_MAIN_SOURCE_FILES)
+        target_link_libraries(${FINAL_EXEC_NAME} project_euler_lib)
+    endif()
+    
+    # Link spdlog library
+    target_link_libraries(${FINAL_EXEC_NAME} spdlog::spdlog)
+    
+    # Set compile features
+    target_compile_features(${FINAL_EXEC_NAME} PRIVATE cxx_std_23)
+endforeach()

src/main-810.cpp

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+#include <spdlog/spdlog.h>
+int main (int argc, char *argv[]) {
+  spdlog::info("Running solution to problem 810");
+  return 0;
+}

src/main.cpp

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+#include <iostream>
+#include <spdlog/spdlog.h>
+int main() {
+
+  spdlog::info("Hello world from logger");
+  return 0;
+}