Add helpers to identify the documents directory

vst/CMakeLists.txt

@@ -18,14 +18,20 @@ set(VSTPLUGIN_SOURCES
     SfizzVstEditor.cpp
     SfizzVstState.cpp
     VstPluginFactory.cpp
-    X11RunLoop.cpp)
+    X11RunLoop.cpp
+    NativeHelpers.cpp)
 
 set(VSTPLUGIN_HEADERS
     SfizzVstProcessor.h
     SfizzVstController.h
     SfizzVstEditor.h
     SfizzVstState.h
-    X11RunLoop.h)
+    X11RunLoop.h
+    NativeHelpers.h)
+
+if(APPLE)
+    list(APPEND VSTPLUGIN_SOURCES NativeHelpers.mm)
+endif()
 
 add_library(${VSTPLUGIN_PRJ_NAME} MODULE
     ${VSTPLUGIN_HEADERS}
@@ -65,6 +71,16 @@ if (MINGW)
     set_target_properties (${VSTPLUGIN_PRJ_NAME} PROPERTIES LINK_FLAGS "-static")
 endif()
 
+# Link system dependencies
+if(WIN32)
+elseif(APPLE)
+    target_link_libraries(${VSTPLUGIN_PRJ_NAME} PRIVATE ${APPLE_FOUNDATION_LIBRARY})
+else()
+    pkg_check_modules(GLIB REQUIRED glib-2.0)
+    target_include_directories(${VSTPLUGIN_PRJ_NAME} PRIVATE ${GLIB_INCLUDE_DIRS})
+    target_link_libraries(${VSTPLUGIN_PRJ_NAME} PRIVATE ${GLIB_LIBRARIES})
+endif()
+
 # Create the bundle (see "VST 3 Locations / Format")
 execute_process (
     COMMAND "${CMAKE_COMMAND}" -E make_directory "${PROJECT_BINARY_DIR}/${VSTPLUGIN_BUNDLE_NAME}/Contents/Resources")

vst/NativeHelpers.cpp

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#include "NativeHelpers.h"
+#include <stdexcept>
+
+#if defined(_WIN32)
+#include <windows.h>
+#include <shlobj.h>
+
+const fs::path& getUserDocumentsDirectory()
+{
+    static const fs::path directory = []() -> fs::path {
+        std::unique_ptr<WCHAR[]> path(new WCHAR[32768]);
+        if (SHGetFolderPathW(nullptr, CSIDL_PERSONAL|CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, path.get()) != S_OK)
+            throw std::runtime_error("Cannot get the document directory.");
+        return fs::path(path.get());
+    }();
+    return directory;
+}
+#elif defined(__APPLE__)
+    // implemented in NativeHelpers.mm
+#else
+#include <glib.h>
+
+const fs::path& getUserDocumentsDirectory()
+{
+    static const fs::path directory = []() -> fs::path {
+        const gchar *path = g_get_user_special_dir(G_USER_DIRECTORY_DOCUMENTS);
+        if (!path)
+            throw std::runtime_error("Cannot get the document directory.");
+        return fs::path(path);
+    }();
+    return directory;
+}
+#endif

vst/NativeHelpers.h

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#pragma once
+#include <ghc/fs_std.hpp>
+
+const fs::path& getUserDocumentsDirectory();

vst/NativeHelpers.mm

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#include "NativeHelpers.h"
+#import <Foundation/Foundation.h>
+#include <stdexcept>
+
+#if defined(__APPLE__)
+const fs::path& getUserDocumentsDirectory()
+{
+    static const fs::path directory = []() -> fs::path {
+        NSFileManager *fm = [NSFileManager defaultManager];
+        NSArray<NSURL *> *urls = [fm URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
+        for (NSUInteger i = 0, n = [urls count]; i < n; ++i) {
+            NSURL *url = [urls objectAtIndex:i];
+            if ([url isFileURL])
+                return fs::path([url path].UTF8String);
+        }
+        throw std::runtime_error("Cannot get the document directory.");
+    }();
+    return directory;
+}
+#endif