Land the package filesystem shell: streaming atomic package_io, journaled rollback carve-out, asymmetric platform pickers

src/shell/package/package_pickers.cpp

@@ -0,0 +1,93 @@
+// package_pickers.cpp — see package_pickers.h. Export is native rather than REAPER
+// API: the SDK's newer GetUserFileName(mode=0) could save, but it resolves to null
+// on older REAPER builds this extension still loads in, while GetSaveFileNameW /
+// BrowseForSaveFile are always present. main.cpp owns the REAPER API pointers; this
+// TU gets them extern.
+
+#include "shell/package/package_pickers.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#include <commdlg.h>
+#else
+#include "swell/swell.h"
+#endif
+
+#define REAPERAPI_MINIMAL
+#define REAPERAPI_WANT_GetUserFileNameForRead
+#define REAPERAPI_WANT_GetMainHwnd
+#include "reaper_plugin_functions.h"
+
+namespace reasampler {
+
+bool pickPackageForImport(std::string& outAbsPath) {
+    outAbsPath.clear();
+    if (!GetUserFileNameForRead) return false;
+    char buf[4096];
+    buf[0] = '\0';
+    // defext spelled without the dot, matching Win32 lpstrDefExt. [verify — DAW]
+    // whether REAPER's picker applies it to the shown filter.
+    if (!GetUserFileNameForRead(buf, "Import bank package", "rsbank")) return false;
+    outAbsPath = buf;
+    return !outAbsPath.empty();
+}
+
+#ifdef _WIN32
+
+bool pickPackageSavePath(const std::string& suggestedFileName, std::string& outAbsPath) {
+    outAbsPath.clear();
+
+    wchar_t file[4096];
+    file[0] = L'\0';
+    if (!suggestedFileName.empty()) {
+        const int wrote = MultiByteToWideChar(CP_UTF8, 0, suggestedFileName.c_str(),
+                                              -1, file, 4096);
+        if (wrote <= 0) file[0] = L'\0';  // unconvertible suggestion -> empty box
+    }
+
+    OPENFILENAMEW ofn{};
+    ofn.lStructSize = sizeof(ofn);
+    ofn.hwndOwner = GetMainHwnd ? GetMainHwnd() : nullptr;
+    ofn.lpstrFilter =
+        L"ReaSampler bank package (*.rsbank)\0*.rsbank\0All files (*.*)\0*.*\0";
+    ofn.lpstrFile = file;
+    ofn.nMaxFile = 4096;
+    ofn.lpstrTitle = L"Export bank package";
+    ofn.lpstrDefExt = L"rsbank";
+    // NOCHANGEDIR: REAPER's process-wide working directory is not ours to move.
+    ofn.Flags = OFN_OVERWRITEPROMPT | OFN_PATHMUSTEXIST | OFN_NOCHANGEDIR |
+                OFN_HIDEREADONLY;
+    if (!GetSaveFileNameW(&ofn)) return false;
+
+    const int need =
+        WideCharToMultiByte(CP_UTF8, 0, file, -1, nullptr, 0, nullptr, nullptr);
+    if (need <= 0) return false;
+    std::string utf8(static_cast<std::size_t>(need), '\0');
+    WideCharToMultiByte(CP_UTF8, 0, file, -1, &utf8[0], need, nullptr, nullptr);
+    if (!utf8.empty() && utf8.back() == '\0') utf8.pop_back();
+    outAbsPath = std::move(utf8);
+    return !outAbsPath.empty();
+}
+
+#else  // SWELL (macOS / Linux)
+
+bool pickPackageSavePath(const std::string& suggestedFileName, std::string& outAbsPath) {
+    outAbsPath.clear();
+    // GetOpenFileName-style pair list; the literal's implicit terminator supplies the
+    // closing double-NUL. [verify — DAW] the exact filter strings SWELL accepts.
+    static const char kExtList[] = "ReaSampler bank package (*.rsbank)\0*.rsbank\0";
+    char fn[4096];
+    fn[0] = '\0';
+    if (!BrowseForSaveFile("Export bank package", nullptr,
+                           suggestedFileName.empty() ? nullptr
+                                                     : suggestedFileName.c_str(),
+                           kExtList, fn, static_cast<int>(sizeof(fn)))) {
+        return false;
+    }
+    outAbsPath = fn;
+    return !outAbsPath.empty();
+}
+
+#endif
+
+}  // namespace reasampler