[apps] Apps can be picked and ordered at compile-time

apps/Makefile

@@ -1,14 +1,20 @@
+include apps/shared/Makefile
+include apps/home/Makefile
+include apps/on_boarding/Makefile
+include apps/hardware_test/Makefile
+snapshots =
+
+# You can select below which apps you want to include in your build, as well as
+# their order on the home screen. Each Makefile below is responsible for setting
+# the $snapshots variable (name of the snapshot class) and the $snapshot_headers
+# (path to the snapshot header).
 include apps/calculation/Makefile
 include apps/graph/Makefile
-include apps/home/Makefile
-include apps/hardware_test/Makefile
-include apps/on_boarding/Makefile
-include apps/probability/Makefile
-include apps/regression/Makefile
 include apps/sequence/Makefile
 include apps/settings/Makefile
-include apps/shared/Makefile
 include apps/statistics/Makefile
+include apps/probability/Makefile
+include apps/regression/Makefile
 include apps/code/Makefile
 #include apps/picview/Makefile
 
@@ -38,6 +44,14 @@ app_objs += $(addprefix apps/,\
   variable_box_leaf_cell.o\
 )
 
+snapshots_declaration = $(foreach i,$(snapshots),$(i) m_snapshot$(subst :,,$(i));)
+snapshots_construction = $(foreach i,$(snapshots),,m_snapshot$(subst :,,$(i))())
+snapshots_list = $(foreach i,$(snapshots),,&m_snapshot$(subst :,,$(i)))
+snapshots_count = $(words $(snapshots))
+snapshot_includes = $(foreach i,$(snapshot_headers),-include $(i) )
+
+apps/apps_container_storage.o apps/main.o: CXXFLAGS += $(snapshot_includes) -DAPPS_CONTAINER_SNAPSHOT_DECLARATIONS="$(snapshots_declaration)" -DAPPS_CONTAINER_SNAPSHOT_CONSTRUCTORS="$(snapshots_construction)" -DAPPS_CONTAINER_SNAPSHOT_LIST="$(snapshots_list)" -DAPPS_CONTAINER_SNAPSHOT_COUNT=$(snapshots_count)
+
 app_images += apps/exam_icon.png
 
 # Tracking which source file uses which image is painful. But we need to ensure

apps/apps_container_storage.cpp

@@ -1,15 +1,22 @@
 #include "apps_container_storage.h"
 
+#ifndef APPS_CONTAINER_SNAPSHOT_CONSTRUCTORS
+#error Missing snapshot constructors
+#endif
+
+#ifndef APPS_CONTAINER_SNAPSHOT_LIST
+#error Missing snapshot list
+#endif
+
+#ifndef APPS_CONTAINER_SNAPSHOT_COUNT
+#error Missing snapshot count
+#endif
+
+constexpr int k_numberOfCommonApps = 1+APPS_CONTAINER_SNAPSHOT_COUNT; // Take the Home app into account
+
 AppsContainerStorage::AppsContainerStorage() :
-  AppsContainer(),
-  m_calculationSnapshot(),
-  m_graphSnapshot(),
-  m_sequenceSnapshot(),
-  m_settingsSnapshot(),
-  m_statisticsSnapshot(),
-  m_probabilitySnapshot(),
-  m_regressionSnapshot(),
-  m_codeSnapshot()
+  AppsContainer()
+  APPS_CONTAINER_SNAPSHOT_CONSTRUCTORS
 {
 }
 
@@ -22,15 +29,8 @@ App::Snapshot * AppsContainerStorage::appSnapshotAtIndex(int index) {
     return nullptr;
   }
   App::Snapshot * snapshots[] = {
-    homeAppSnapshot(),
-    &m_calculationSnapshot,
-    &m_graphSnapshot,
-    &m_sequenceSnapshot,
-    &m_settingsSnapshot,
-    &m_statisticsSnapshot,
-    &m_probabilitySnapshot,
-    &m_regressionSnapshot,
-    &m_codeSnapshot
+    homeAppSnapshot()
+    APPS_CONTAINER_SNAPSHOT_LIST
   };
   assert(sizeof(snapshots)/sizeof(snapshots[0]) == k_numberOfCommonApps);
   assert(index >= 0 && index < k_numberOfCommonApps);

apps/apps_container_storage.h

@@ -2,14 +2,10 @@
 #define APPS_CONTAINER_STORAGE_H
 
 #include "apps_container.h"
-#include "graph/app.h"
-#include "probability/app.h"
-#include "calculation/app.h"
-#include "regression/app.h"
-#include "sequence/app.h"
-#include "settings/app.h"
-#include "statistics/app.h"
-#include "code/app.h"
+
+#ifndef APPS_CONTAINER_SNAPSHOT_DECLARATIONS
+#error Missing snapshot declarations
+#endif
 
 class AppsContainerStorage : public AppsContainer {
 public:
@@ -17,16 +13,7 @@ public:
   int numberOfApps() override;
   App::Snapshot * appSnapshotAtIndex(int index) override;
 private:
-  static constexpr int k_numberOfCommonApps = 9;
-  static constexpr int k_totalNumberOfApps = 2+k_numberOfCommonApps;
-  Calculation::App::Snapshot m_calculationSnapshot;
-  Graph::App::Snapshot m_graphSnapshot;
-  Sequence::App::Snapshot m_sequenceSnapshot;
-  Settings::App::Snapshot m_settingsSnapshot;
-  Statistics::App::Snapshot m_statisticsSnapshot;
-  Probability::App::Snapshot m_probabilitySnapshot;
-  Regression::App::Snapshot m_regressionSnapshot;
-  Code::App::Snapshot m_codeSnapshot;
+  APPS_CONTAINER_SNAPSHOT_DECLARATIONS
 };
 
 #endif

apps/calculation/Makefile

@@ -1,3 +1,6 @@
+snapshots += Calculation::App::Snapshot
+snapshot_headers += apps/calculation/app.h
+
 app_objs += $(addprefix apps/calculation/,\
   app.o\
   calculation.o\

apps/code/Makefile

@@ -1,3 +1,6 @@
+snapshots += Code::App::Snapshot
+snapshot_headers += apps/code/app.h
+
 app_objs += $(addprefix apps/code/,\
   app.o\
   editor_controller.o\

apps/graph/Makefile

@@ -1,3 +1,6 @@
+snapshots += Graph::App::Snapshot
+snapshot_headers += apps/graph/app.h
+
 app_objs += $(addprefix apps/graph/,\
   app.o\
   cartesian_function.o\

apps/probability/Makefile

@@ -1,3 +1,6 @@
+snapshots += Probability::App::Snapshot
+snapshot_headers += apps/probability/app.h
+
 app_objs += $(addprefix apps/probability/,\
   app.o\
   calculation/calculation.o\

apps/regression/Makefile

@@ -1,3 +1,6 @@
+snapshots += Regression::App::Snapshot
+snapshot_headers += apps/regression/app.h
+
 app_objs += $(addprefix apps/regression/,\
   app.o\
   banner_view.o\

apps/sequence/Makefile

@@ -1,3 +1,6 @@
+snapshots += Sequence::App::Snapshot
+snapshot_headers += apps/sequence/app.h
+
 app_objs += $(addprefix apps/sequence/,\
   app.o\
   graph/banner_view.o\

apps/settings/Makefile

@@ -1,3 +1,6 @@
+snapshots += Settings::App::Snapshot
+snapshot_headers += apps/settings/app.h
+
 app_objs += $(addprefix apps/settings/,\
   app.o\
   main_controller.o\

apps/statistics/Makefile

@@ -1,3 +1,6 @@
+snapshots += Statistics::App::Snapshot
+snapshot_headers += apps/statistics/app.h
+
 app_objs += $(addprefix apps/statistics/,\
   app.o\
   box_banner_view.o\