refactor: 💥 header files with the entire system definitions moved up in the directory tree

src/systems/CMakeLists.txt

@@ -25,38 +25,38 @@ cmake_minimum_required(VERSION 3.23)
 add_mp_units_module(
     systems mp-units-systems
     DEPENDENCIES mp-units::core
-    HEADERS include/mp-units/systems/angular/angular.h
-            include/mp-units/systems/angular/math.h
+    HEADERS include/mp-units/systems/angular/math.h
             include/mp-units/systems/angular/units.h
-            include/mp-units/systems/cgs/cgs.h
-            include/mp-units/systems/hep/hep.h
-            include/mp-units/systems/iau/iau.h
             include/mp-units/systems/iec80000/binary_prefixes.h
-            include/mp-units/systems/iec80000/iec80000.h
             include/mp-units/systems/iec80000/quantities.h
             include/mp-units/systems/iec80000/unit_symbols.h
             include/mp-units/systems/iec80000/units.h
-            include/mp-units/systems/imperial/imperial.h
-            include/mp-units/systems/international/international.h
             include/mp-units/systems/isq/atomic_and_nuclear_physics.h
             include/mp-units/systems/isq/base_quantities.h
             include/mp-units/systems/isq/electromagnetism.h
-            include/mp-units/systems/isq/isq.h
             include/mp-units/systems/isq/light_and_radiation.h
             include/mp-units/systems/isq/mechanics.h
             include/mp-units/systems/isq/si_quantities.h
             include/mp-units/systems/isq/space_and_time.h
             include/mp-units/systems/isq/thermodynamics.h
-            include/mp-units/systems/isq_angle/isq_angle.h
-            include/mp-units/systems/natural/natural.h
             include/mp-units/systems/si/chrono.h
             include/mp-units/systems/si/constants.h
             include/mp-units/systems/si/math.h
             include/mp-units/systems/si/prefixes.h
-            include/mp-units/systems/si/si.h
             include/mp-units/systems/si/unit_symbols.h
             include/mp-units/systems/si/units.h
-            include/mp-units/systems/typographic/typographic.h
-            include/mp-units/systems/usc/usc.h
+            include/mp-units/systems/angular.h
+            include/mp-units/systems/cgs.h
+            include/mp-units/systems/hep.h
+            include/mp-units/systems/iau.h
+            include/mp-units/systems/iec80000.h
+            include/mp-units/systems/imperial.h
+            include/mp-units/systems/international.h
+            include/mp-units/systems/isq.h
+            include/mp-units/systems/isq_angle.h
+            include/mp-units/systems/natural.h
+            include/mp-units/systems/si.h
+            include/mp-units/systems/typographic.h
+            include/mp-units/systems/usc.h
     MODULE_INTERFACE_UNIT mp-units-systems.cpp
 )

src/systems/include/mp-units/systems/hep.h

@@ -23,7 +23,7 @@
 #pragma once
 
 #include <mp-units/bits/module_macros.h>
-#include <mp-units/systems/si/si.h>
+#include <mp-units/systems/si.h>
 #include <cstdint>
 
 // IWYU pragma: begin_exports

src/systems/include/mp-units/systems/imperial.h

@@ -25,7 +25,7 @@
 #include <mp-units/bits/module_macros.h>
 
 // IWYU pragma: begin_exports
-#include <mp-units/systems/international/international.h>
+#include <mp-units/systems/international.h>
 
 #ifndef MP_UNITS_IN_MODULE_INTERFACE
 #include <mp-units/framework.h>

src/systems/include/mp-units/systems/isq_angle.h

@@ -25,8 +25,8 @@
 #include <mp-units/bits/module_macros.h>
 
 // IWYU pragma: begin_exports
-#include <mp-units/systems/angular/angular.h>
-#include <mp-units/systems/isq/isq.h>
+#include <mp-units/systems/angular.h>
+#include <mp-units/systems/isq.h>
 
 #ifndef MP_UNITS_IN_MODULE_INTERFACE
 #include <mp-units/framework/quantity_spec.h>

src/systems/include/mp-units/systems/typographic.h

@@ -23,7 +23,7 @@
 #pragma once
 
 #include <mp-units/bits/module_macros.h>
-#include <mp-units/systems/international/international.h>
+#include <mp-units/systems/international.h>
 
 // IWYU pragma: begin_exports
 #ifndef MP_UNITS_IN_MODULE_INTERFACE

src/systems/include/mp-units/systems/usc.h

@@ -25,7 +25,7 @@
 #include <mp-units/bits/module_macros.h>
 
 // IWYU pragma: begin_exports
-#include <mp-units/systems/international/international.h>
+#include <mp-units/systems/international.h>
 
 #ifndef MP_UNITS_IN_MODULE_INTERFACE
 #include <mp-units/framework.h>

src/systems/mp-units-systems.cpp

@@ -9,16 +9,16 @@ export import mp_units.core;
 
 #define MP_UNITS_IN_MODULE_INTERFACE
 
-#include <mp-units/systems/angular/angular.h>
-#include <mp-units/systems/cgs/cgs.h>
-#include <mp-units/systems/hep/hep.h>
-#include <mp-units/systems/iau/iau.h>
-#include <mp-units/systems/iec80000/iec80000.h>
-#include <mp-units/systems/imperial/imperial.h>
-#include <mp-units/systems/international/international.h>
-#include <mp-units/systems/isq/isq.h>
-#include <mp-units/systems/isq_angle/isq_angle.h>
-#include <mp-units/systems/natural/natural.h>
-#include <mp-units/systems/si/si.h>
-#include <mp-units/systems/typographic/typographic.h>
-#include <mp-units/systems/usc/usc.h>
+#include <mp-units/systems/angular.h>
+#include <mp-units/systems/cgs.h>
+#include <mp-units/systems/hep.h>
+#include <mp-units/systems/iau.h>
+#include <mp-units/systems/iec80000.h>
+#include <mp-units/systems/imperial.h>
+#include <mp-units/systems/international.h>
+#include <mp-units/systems/isq.h>
+#include <mp-units/systems/isq_angle.h>
+#include <mp-units/systems/natural.h>
+#include <mp-units/systems/si.h>
+#include <mp-units/systems/typographic.h>
+#include <mp-units/systems/usc.h>