WiiUPluginSystem/plugins/example_plugin_cpp/src/main.cpp

#include "utils/logger.h"
#include <coreinit/filesystem.h>
#include <malloc.h>
#include <wups.h>
#include <wups/config/WUPSConfigItemBoolean.h>
#include <wups/config/WUPSConfigItemIntegerRange.h>
#include <wups/config/WUPSConfigItemMultipleValues.h>
#include <wups/config/WUPSConfigItemStub.h>
#include <wups/config_api.h>

/**
    Mandatory plugin information.
    If not set correctly, the loader will refuse to use the plugin.
**/
WUPS_PLUGIN_NAME("Example plugin C++");
WUPS_PLUGIN_DESCRIPTION("This is just an example plugin written in C++");
WUPS_PLUGIN_VERSION("v1.0");
WUPS_PLUGIN_AUTHOR("Maschell");
WUPS_PLUGIN_LICENSE("BSD");

#define LOG_FS_OPEN_CONFIG_ID             "logFSOpen"
#define OTHER_EXAMPLE_BOOL_CONFIG_ID      "otherBoolItem"
#define OTHER_EXAMPLE2_BOOL_CONFIG_ID     "other2BoolItem"
#define INTEGER_RANGE_EXAMPLE_CONFIG_ID   "intRangeExample"
#define MULTIPLE_VALUES_EXAMPLE_CONFIG_ID "multValueExample"

/**
    All of this defines can be used in ANY file.
    It's possible to split it up into multiple files.

**/

WUPS_USE_WUT_DEVOPTAB();                // Use the wut devoptabs
WUPS_USE_STORAGE("example_plugin_cpp"); // Unique id for the storage api

enum ExampleOptions {
    EXAMPLE_OPTION_1 = 0,
    EXAMPLE_OPTION_2 = 1,
    EXAMPLE_OPTION_3 = 2,
};

#define LOF_FS_OPEN_DEFAULT_VALUE     true
#define INTEGER_RANGE_DEFAULT_VALUE   10
#define MULTIPLE_VALUES_DEFAULT_VALUE EXAMPLE_OPTION_2

bool sLogFSOpen                    = LOF_FS_OPEN_DEFAULT_VALUE;
int sIntegerRangeValue             = INTEGER_RANGE_DEFAULT_VALUE;
ExampleOptions sExampleOptionValue = MULTIPLE_VALUES_DEFAULT_VALUE;

/**
 * Callback that will be called if the config has been changed
 */
void boolItemChanged(ConfigItemBoolean *item, bool newValue) {
    DEBUG_FUNCTION_LINE_INFO("New value in boolItemChanged: %d", newValue);
    if (std::string_view(LOG_FS_OPEN_CONFIG_ID) == item->identifier) {
        sLogFSOpen = newValue;
        // If the value has changed, we store it in the storage.
        WUPS_StoreInt(nullptr, item->identifier, newValue);
    } else if (std::string_view(OTHER_EXAMPLE_BOOL_CONFIG_ID) == item->identifier) {
        DEBUG_FUNCTION_LINE_ERR("Other bool value has changed to %d", newValue);
    } else if (std::string_view(OTHER_EXAMPLE2_BOOL_CONFIG_ID) == item->identifier) {
        DEBUG_FUNCTION_LINE_ERR("Other2 bool value has changed to %d", newValue);
    }
}

void integerRangeItemChanged(ConfigItemIntegerRange *item, int newValue) {
    DEBUG_FUNCTION_LINE_INFO("New value in integerRangeItemChanged: %d", newValue);
    // If the value has changed, we store it in the storage.
    if (std::string_view(LOG_FS_OPEN_CONFIG_ID) == item->identifier) {
        sIntegerRangeValue = newValue;
        // If the value has changed, we store it in the storage.
        WUPS_StoreInt(nullptr, item->identifier, newValue);
    }
}

void multipleValueItemChanged(ConfigItemIntegerRange *item, uint32_t newValue) {
    DEBUG_FUNCTION_LINE_INFO("New value in multipleValueItemChanged: %d", newValue);
    // If the value has changed, we store it in the storage.
    if (std::string_view(MULTIPLE_VALUES_EXAMPLE_CONFIG_ID) == item->identifier) {
        sExampleOptionValue = (ExampleOptions) newValue;
        // If the value has changed, we store it in the storage.
        WUPS_StoreInt(nullptr, item->identifier, sExampleOptionValue);
    }
}

WUPSConfigAPICallbackStatus ConfigMenuOpenedCallback(WUPSConfigCategoryHandle rootHandle) {
    // We open the storage, so we can persist the configuration the user did.
    if (WUPS_OpenStorage() != WUPS_STORAGE_ERROR_SUCCESS) {
        DEBUG_FUNCTION_LINE("Failed to open storage");
        return WUPSCONFIG_API_CALLBACK_RESULT_ERROR;
    }
    // To use the C++ API, we create new WUPSConfigCategory from the root handle!
    WUPSConfigCategory root = WUPSConfigCategory(rootHandle);

    // The functions of the Config API come in two variants: One that throws an exception, and another one which doesn't
    // To use the Config API without exception see the example below this try/catch block.
    try {
        // Then we can simply create a new category
        auto functionPatchesCat = WUPSConfigCategory::Create("function patches");

        // Add a boolean item to this newly created category
        functionPatchesCat.add(WUPSConfigItemBoolean::Create(LOG_FS_OPEN_CONFIG_ID, "Log FSOpen calls",
                                                             LOF_FS_OPEN_DEFAULT_VALUE, sLogFSOpen,
                                                             boolItemChanged));

        // And finally move that category to the root category.
        // Note: "functionPatchesCat" can NOT be changed after adding it to root.
        root.add(std::move(functionPatchesCat));

        // We can also add items directly to root!
        root.add(WUPSConfigItemBoolean::Create(OTHER_EXAMPLE_BOOL_CONFIG_ID, "Just another bool item",
                                               false, false,
                                               boolItemChanged));

        // You can also add an item which just displays any text.
        root.add(WUPSConfigItemStub::Create("This item is just displaying some text"));

        // It's also possible to create and item to select an integer from a range.
        root.add(WUPSConfigItemIntegerRange::Create(INTEGER_RANGE_EXAMPLE_CONFIG_ID, "Item for selecting an integer between 0 and 50",
                                                    INTEGER_RANGE_DEFAULT_VALUE, sIntegerRangeValue,
                                                    0, 50,
                                                    &integerRangeItemChanged));


        // To select value from an enum WUPSConfigItemMultipleValues fits the best.
        constexpr WUPSConfigItemMultipleValues::ValuePair possibleValues[] = {
                {EXAMPLE_OPTION_1, "Option 1"},
                {EXAMPLE_OPTION_2, "Option 2"},
                {EXAMPLE_OPTION_3, "Option 3"},
        };

        // It comes in two variants.
        // - "WUPSConfigItemMultipleValues::CreateFromValue" will take a default and current **value**
        // - "WUPSConfigItemMultipleValues::CreateFromIndex" will take a default and current **index**
        root.add(WUPSConfigItemMultipleValues::CreateFromValue(MULTIPLE_VALUES_EXAMPLE_CONFIG_ID, "Select an option!",
                                                               MULTIPLE_VALUES_DEFAULT_VALUE, sExampleOptionValue,
                                                               possibleValues,
                                                               nullptr));

        // It's also possible to have nested categories
        auto nc1 = WUPSConfigCategory::Create("Category inside root");
        auto nc2 = WUPSConfigCategory::Create("Category inside subcategory 1");
        auto nc3 = WUPSConfigCategory::Create("Category inside subcategory 2");

        nc3.add(WUPSConfigItemStub::Create("Item inside subcategory 3"));
        nc2.add(WUPSConfigItemStub::Create("Item inside subcategory 2"));
        nc1.add(WUPSConfigItemStub::Create("Item inside subcategory 1"));

        nc2.add(std::move(nc3));
        nc1.add(std::move(nc2));
        root.add(std::move(nc1));
    } catch (std::exception &e) {
        DEBUG_FUNCTION_LINE_ERR("Creating config menu failed: %s", e.what());
        return WUPSCONFIG_API_CALLBACK_RESULT_ERROR;
    }

    // In case we don't like exception, we can use the API as well.
    // If we add a "WUPSConfigAPIStatus" reference to the API calls, the function won't throw an exception.
    // Instead it will return std::optionals and write the result into the WUPSConfigAPIStatus.
    WUPSConfigAPIStatus err;
    auto categoryOpt = WUPSConfigCategory::Create("Just another Category", err);
    if (!categoryOpt) {
        DEBUG_FUNCTION_LINE_ERR("Failed to create category: %s", WUPSConfigAPI_GetStatusStr(err));
        return WUPSCONFIG_API_CALLBACK_RESULT_ERROR;
    }

    auto boolItemOpt = WUPSConfigItemBoolean::Create(OTHER_EXAMPLE2_BOOL_CONFIG_ID, "Just another bool item",
                                                     false, false,
                                                     boolItemChanged,
                                                     err);
    if (!boolItemOpt) {
        DEBUG_FUNCTION_LINE_ERR("Failed to create bool item: %s", WUPSConfigAPI_GetStatusStr(err));
        return WUPSCONFIG_API_CALLBACK_RESULT_ERROR;
    }

    // Add bool item to category
    if (!categoryOpt->add(std::move(*boolItemOpt), err)) {
        DEBUG_FUNCTION_LINE_ERR("Failed to add bool item to category: %s", WUPSConfigAPI_GetStatusStr(err));
        return WUPSCONFIG_API_CALLBACK_RESULT_ERROR;
    }

    // Add category to root.
    if (!root.add(std::move(*categoryOpt), err)) {
        DEBUG_FUNCTION_LINE_ERR("Failed to add category to root: %s", WUPSConfigAPI_GetStatusStr(err));
        return WUPSCONFIG_API_CALLBACK_RESULT_ERROR;
    }

    return WUPSCONFIG_API_CALLBACK_RESULT_SUCCESS;
}

void ConfigMenuClosedCallback() {
    // Save all changes
    if (WUPS_CloseStorage() != WUPS_STORAGE_ERROR_SUCCESS) {
        DEBUG_FUNCTION_LINE_ERR("Failed to close storage");
    }
}

/**
    Gets called ONCE when the plugin was loaded.
**/
INITIALIZE_PLUGIN() {
    // Logging only works when compiled with `make DEBUG=1`. See the README for more information.
    initLogging();
    DEBUG_FUNCTION_LINE("INITIALIZE_PLUGIN of example_plugin!");

    WUPSConfigAPIOptionsV1 configOptions = {.name = "example_plugin"};
    if (WUPSConfigAPI_Init(configOptions, ConfigMenuOpenedCallback, ConfigMenuClosedCallback) != WUPSCONFIG_API_RESULT_SUCCESS) {
        DEBUG_FUNCTION_LINE_ERR("Failed to init config api");
    }

    // Open storage to read values
    WUPSStorageError storageRes = WUPS_OpenStorage();
    if (storageRes != WUPS_STORAGE_ERROR_SUCCESS) {
        DEBUG_FUNCTION_LINE("Failed to open storage %s (%d)", WUPS_GetStorageStatusStr(storageRes), storageRes);
    } else {
        // Try to get value from storage
        if ((storageRes = WUPS_GetBool(nullptr, LOG_FS_OPEN_CONFIG_ID, &sLogFSOpen)) == WUPS_STORAGE_ERROR_NOT_FOUND) {
            // Add the value to the storage if it's missing.
            if (WUPS_StoreBool(nullptr, LOG_FS_OPEN_CONFIG_ID, sLogFSOpen) != WUPS_STORAGE_ERROR_SUCCESS) {
                DEBUG_FUNCTION_LINE("Failed to store bool");
            }
        } else if (storageRes != WUPS_STORAGE_ERROR_SUCCESS) {
            DEBUG_FUNCTION_LINE("Failed to get bool %s (%d)", WUPS_GetStorageStatusStr(storageRes), storageRes);
        }

        // Close storage
        if (WUPS_CloseStorage() != WUPS_STORAGE_ERROR_SUCCESS) {
            DEBUG_FUNCTION_LINE("Failed to close storage");
        }
    }
    deinitLogging();
}

/**
    Gets called when the plugin will be unloaded.
**/
DEINITIALIZE_PLUGIN() {
    DEBUG_FUNCTION_LINE("DEINITIALIZE_PLUGIN of example_plugin!");
}

/**
    Gets called when an application starts.
**/
ON_APPLICATION_START() {
    initLogging();

    DEBUG_FUNCTION_LINE("ON_APPLICATION_START of example_plugin!");
}

/**
 * Gets called when an application actually ends
 */
ON_APPLICATION_ENDS() {
    deinitLogging();
}

/**
    Gets called when an application request to exit.
**/
ON_APPLICATION_REQUESTS_EXIT() {
    DEBUG_FUNCTION_LINE_INFO("ON_APPLICATION_REQUESTS_EXIT of example_plugin!");
}

/**
    This defines a function replacement.
    It allows to replace the system function with an own function. 
    So whenever a game / application calls an overridden function, your function gets called instead.
    
    Currently it's only possible to override functions that are loaded from .rpl files of OSv10 (00050010-1000400A).
    
    Signature of this macro:
    DECL_FUNCTION(  RETURN_TYPE, ARBITRARY_NAME_OF_FUNCTION , ARGS_SEPERATED_BY_COMMA){
        //Your code goes here.
    }
    
    Within this macro, two more function get declare you can use.
    my_ARBITRARY_NAME_OF_FUNCTION and real_ARBITRARY_NAME_OF_FUNCTION
    
    RETURN_TYPE my_ARBITRARY_NAME_OF_FUNCTION(ARGS_SEPERATED_BY_COMMA):
        is just name of the function that gets declared in this macro. 
        It has the same effect as calling the overridden function directly.
    
    RETURN_TYPE real_ARBITRARY_NAME_OF_FUNCTION(ARGS_SEPERATED_BY_COMMA):
        is the name of the function, that leads to function that was overridden.
        Use this to call the original function that will be overridden.
        CAUTION: Other plugins may already have manipulated the return value or arguments.

    Use this macro for each function you want to override
**/
DECL_FUNCTION(int, FSOpenFile, FSClient *pClient, FSCmdBlock *pCmd, const char *path, const char *mode, int *handle, int error) {
    int result = real_FSOpenFile(pClient, pCmd, path, mode, handle, error);
    if (sLogFSOpen) {
        DEBUG_FUNCTION_LINE_INFO("FSOpenFile called for folder %s! Result %d", path, result);
    }
    return result;
}

/**
This tells the loader which functions from which library (.rpl) should be replaced with which function from this file.
The list of possible libraries can be found in the wiki. (In general it's WUPS_LOADER_LIBRARY_ + the name of the RPL in caps lock)

WUPS_MUST_REPLACE(FUNCTION_NAME_IN_THIS_FILE,   NAME_OF_LIB_WHICH_CONTAINS_THIS_FUNCTION,   NAME_OF_FUNCTION_TO_OVERRIDE)

Define this for each function you want to override.
**/
WUPS_MUST_REPLACE(FSOpenFile, WUPS_LOADER_LIBRARY_COREINIT, FSOpenFile);