[wpigui] Add option to reset UI on exit (#3463)

Also add wpiutil as a dependency for wpigui.

wpigui/.styleguide

@@ -27,4 +27,5 @@ includeOtherLibs {
   ^imgui
   ^implot
   ^stb
+  ^wpi/
 }

wpigui/CMakeLists.txt

@@ -15,7 +15,7 @@ set_property(TARGET wpigui PROPERTY POSITION_INDEPENDENT_CODE ON)
 set_property(TARGET wpigui PROPERTY FOLDER "libraries")
 
 wpilib_target_warnings(wpigui)
-target_link_libraries(wpigui PUBLIC imgui)
+target_link_libraries(wpigui PUBLIC imgui wpiutil)
 
 target_include_directories(wpigui PUBLIC
                             $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/main/native/include>

wpigui/build.gradle

@@ -62,6 +62,7 @@ if (!project.hasProperty('onlylinuxathena') && !project.hasProperty('onlylinuxra
                 }
                 binaries.all {
                     nativeUtils.useRequiredLibrary(it, 'imgui_static')
+                    lib project: ':wpiutil', library: 'wpiutil', linkage: 'shared'
                     if (it.targetPlatform.name == nativeUtils.wpi.platforms.roborio || it.targetPlatform.name == nativeUtils.wpi.platforms.raspbian || it.targetPlatform.name == nativeUtils.wpi.platforms.aarch64bionic) {
                         it.buildable = false
                         return
@@ -119,6 +120,7 @@ if (!project.hasProperty('onlylinuxathena') && !project.hasProperty('onlylinuxra
                 binaries.all {
                     lib library: 'wpigui'
                     nativeUtils.useRequiredLibrary(it, 'imgui_static')
+                    lib project: ':wpiutil', library: 'wpiutil', linkage: 'shared'
                 }
             }
         }

wpigui/src/main/native/cpp/wpigui.cpp

@@ -15,6 +15,7 @@
 #include <imgui_internal.h>
 #include <implot.h>
 #include <stb_image.h>
+#include <wpi/fs.h>
 
 #include "wpigui_internal.h"
 
@@ -290,6 +291,11 @@ void gui::Main() {
   ImPlot::DestroyContext();
   ImGui::DestroyContext();
 
+  // Delete the save file if requested.
+  if (gContext->resetOnExit) {
+    fs::remove(fs::path{gContext->iniPath});
+  }
+
   glfwDestroyWindow(gContext->window);
   glfwTerminate();
 }
@@ -466,6 +472,8 @@ void gui::EmitViewMenu() {
       }
       ImGui::EndMenu();
     }
+
+    ImGui::MenuItem("Reset UI on Exit?", nullptr, &gContext->resetOnExit);
     ImGui::EndMenu();
   }
 }

wpigui/src/main/native/include/wpigui_internal.h

@@ -57,6 +57,7 @@ struct Context : public SavedSettings {
   std::vector<GLFWimage> icons;
 
   std::string iniPath = "imgui.ini";
+  bool resetOnExit = false;
 };
 
 extern Context* gContext;