From dfaee89d5694a2fe15d9dd0c15b0a0ac7ed50d6b Mon Sep 17 00:00:00 2001
From: Michael Mandl <mandlm@molez.net>
Date: Sat, 21 Oct 2023 11:43:01 +0200
Subject: [PATCH] refactor: restructure project to build a library for each
 book chapter

---
 CMakeLists.txt                                   | 16 ++++++++++------
 chapters/CMakeLists.txt                          |  1 +
 chapters/chapter_02/CMakeLists.txt               |  4 ++++
 .../chapter_02/include}/constexp.h               |  0
 .../chapter_02/include}/ifswitch.h               |  0
 .../chapter_02/include}/initlist.h               |  0
 {include => chapters/chapter_02/include}/null.h  |  0
 {src => chapters/chapter_02/src}/constexp.cpp    |  0
 {src => chapters/chapter_02/src}/ifswitch.cpp    |  0
 {src => chapters/chapter_02/src}/initlist.cpp    |  0
 {src => chapters/chapter_02/src}/null.cpp        |  0
 11 files changed, 15 insertions(+), 6 deletions(-)
 create mode 100644 chapters/CMakeLists.txt
 create mode 100644 chapters/chapter_02/CMakeLists.txt
 rename {include => chapters/chapter_02/include}/constexp.h (100%)
 rename {include => chapters/chapter_02/include}/ifswitch.h (100%)
 rename {include => chapters/chapter_02/include}/initlist.h (100%)
 rename {include => chapters/chapter_02/include}/null.h (100%)
 rename {src => chapters/chapter_02/src}/constexp.cpp (100%)
 rename {src => chapters/chapter_02/src}/ifswitch.cpp (100%)
 rename {src => chapters/chapter_02/src}/initlist.cpp (100%)
 rename {src => chapters/chapter_02/src}/null.cpp (100%)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e5f9770..31c0d68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 
 project(
-  hello
+  book_exercises
   VERSION 0.1.0
   LANGUAGES CXX)
 
@@ -19,13 +19,17 @@ include(FetchContent)
 configure_file("${PROJECT_SOURCE_DIR}/include/version.h.in"
                "${PROJECT_BINARY_DIR}/include/version.h")
 
-add_executable(hello src/main.cpp src/null.cpp src/constexp.cpp
-                     src/ifswitch.cpp src/initlist.cpp)
+add_subdirectory(chapters)
 
-target_compile_features(hello PUBLIC cxx_std_20)
+add_executable(book_exercises src/main.cpp)
 
-target_include_directories(hello PRIVATE "${PROJECT_BINARY_DIR}/include"
-                                         "${PROJECT_SOURCE_DIR}/include")
+target_compile_features(book_exercises PUBLIC cxx_std_20)
+
+target_include_directories(
+  book_exercises PRIVATE "${PROJECT_BINARY_DIR}/include"
+                         "${PROJECT_SOURCE_DIR}/include")
+
+target_link_libraries(book_exercises PRIVATE chapter_02)
 
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
   add_subdirectory(tests)
diff --git a/chapters/CMakeLists.txt b/chapters/CMakeLists.txt
new file mode 100644
index 0000000..5c13caf
--- /dev/null
+++ b/chapters/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(chapter_02)
diff --git a/chapters/chapter_02/CMakeLists.txt b/chapters/chapter_02/CMakeLists.txt
new file mode 100644
index 0000000..51d62aa
--- /dev/null
+++ b/chapters/chapter_02/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_library(chapter_02 src/initlist.cpp src/null.cpp src/constexp.cpp
+                       src/ifswitch.cpp)
+
+target_include_directories(chapter_02 PUBLIC include)
diff --git a/include/constexp.h b/chapters/chapter_02/include/constexp.h
similarity index 100%
rename from include/constexp.h
rename to chapters/chapter_02/include/constexp.h
diff --git a/include/ifswitch.h b/chapters/chapter_02/include/ifswitch.h
similarity index 100%
rename from include/ifswitch.h
rename to chapters/chapter_02/include/ifswitch.h
diff --git a/include/initlist.h b/chapters/chapter_02/include/initlist.h
similarity index 100%
rename from include/initlist.h
rename to chapters/chapter_02/include/initlist.h
diff --git a/include/null.h b/chapters/chapter_02/include/null.h
similarity index 100%
rename from include/null.h
rename to chapters/chapter_02/include/null.h
diff --git a/src/constexp.cpp b/chapters/chapter_02/src/constexp.cpp
similarity index 100%
rename from src/constexp.cpp
rename to chapters/chapter_02/src/constexp.cpp
diff --git a/src/ifswitch.cpp b/chapters/chapter_02/src/ifswitch.cpp
similarity index 100%
rename from src/ifswitch.cpp
rename to chapters/chapter_02/src/ifswitch.cpp
diff --git a/src/initlist.cpp b/chapters/chapter_02/src/initlist.cpp
similarity index 100%
rename from src/initlist.cpp
rename to chapters/chapter_02/src/initlist.cpp
diff --git a/src/null.cpp b/chapters/chapter_02/src/null.cpp
similarity index 100%
rename from src/null.cpp
rename to chapters/chapter_02/src/null.cpp