From 8de978df9130a72b954846df86c41bf463c43e7c Mon Sep 17 00:00:00 2001
From: Jean Pierre Cimalando <jp-dev@inbox.ru>
Date: Mon, 22 Feb 2021 09:11:16 +0100
Subject: [PATCH] Add native helper for the question dialog

---
 plugins/editor/src/editor/NativeHelpers.cpp | 77 ++++++++++++++++++++-
 plugins/editor/src/editor/NativeHelpers.h   |  1 +
 plugins/editor/src/editor/NativeHelpers.mm  | 10 +++
 3 files changed, 86 insertions(+), 2 deletions(-)

diff --git a/plugins/editor/src/editor/NativeHelpers.cpp b/plugins/editor/src/editor/NativeHelpers.cpp
index a8cbb255..0a3ac516 100644
--- a/plugins/editor/src/editor/NativeHelpers.cpp
+++ b/plugins/editor/src/editor/NativeHelpers.cpp
@@ -11,9 +11,20 @@
 #include <windows.h>
 #include <cstring>
 
+static WCHAR *stringToWideChar(const char *str, int strCch = -1)
+{
+    unsigned strSize = MultiByteToWideChar(CP_UTF8, 0, str, strCch, nullptr, 0);
+    if (strSize == 0)
+        return {};
+    std::unique_ptr<WCHAR[]> strW(new WCHAR[strSize]);
+    if (MultiByteToWideChar(CP_UTF8, 0, str, strCch, strW.get(), strSize) == 0)
+        return {};
+    return strW.release();
+}
+
 bool openFileInExternalEditor(const char *filename)
 {
-    std::wstring path = fs::u8path(filename).wstring();
+    std::wstring path = stringToWideChar(filename);
 
     SHELLEXECUTEINFOW info;
     memset(&info, 0, sizeof(info));
@@ -30,7 +41,7 @@ bool openFileInExternalEditor(const char *filename)
 
 bool openDirectoryInExplorer(const char *filename)
 {
-    std::wstring path = fs::u8path(filename).wstring();
+    std::wstring path = stringToWideChar(filename);
 
     SHELLEXECUTEINFOW info;
     memset(&info, 0, sizeof(info));
@@ -42,10 +53,23 @@ bool openDirectoryInExplorer(const char *filename)
 
     return ShellExecuteExW(&info);
 }
+
+bool askQuestion(const char *text)
+{
+    int ret = MessageBoxW(nullptr, stringToWideChar(text), L"Question", MB_YESNO);
+    return ret == IDYES;
+}
 #elif defined(__APPLE__)
     // implemented in NativeHelpers.mm
 #else
 #include <gio/gio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <vector>
+#include <cstring>
+#include <cerrno>
+extern "C" { extern char **environ; }
 
 static bool openFileByMimeType(const char *filename, const char *mimetype)
 {
@@ -72,4 +96,53 @@ bool openDirectoryInExplorer(const char *filename)
 {
     return openFileByMimeType(filename, "inode/directory");
 }
+
+static std::vector<char *> createForkEnviron()
+{
+    std::vector<char *> newEnv;
+    newEnv.reserve(256);
+    for (char **envp = environ; *envp; ++envp) {
+        // ensure the process will link with system libraries,
+        // and not these from the Ardour bundle.
+        if (strncmp(*envp, "LD_LIBRARY_PATH=", 16) == 0)
+            continue;
+        newEnv.push_back(*envp);
+    }
+    newEnv.push_back(nullptr);
+    return newEnv;
+}
+
+bool askQuestion(const char *text)
+{
+    char *argv[] = {
+        const_cast<char *>("/usr/bin/zenity"),
+        const_cast<char *>("--question"),
+        const_cast<char *>("--text"),
+        const_cast<char *>(text),
+        nullptr,
+    };
+
+    std::vector<char *> newEnv = createForkEnviron();
+    char **envp = newEnv.data();
+
+    pid_t forkPid = vfork();
+    if (forkPid == -1)
+        return false;
+
+    if (forkPid == 0) {
+        execve(argv[0], argv, envp);
+        _exit(1);
+    }
+
+    int wret;
+    int wstatus;
+    do {
+        wret = waitpid(forkPid, &wstatus, 0);
+    } while (wret == -1 && errno == EINTR);
+
+    if (wret == -1 || !WIFEXITED(wstatus))
+        return false;
+
+    return WEXITSTATUS(wstatus) == 0;
+}
 #endif
diff --git a/plugins/editor/src/editor/NativeHelpers.h b/plugins/editor/src/editor/NativeHelpers.h
index 3ca310f7..9ccb5410 100644
--- a/plugins/editor/src/editor/NativeHelpers.h
+++ b/plugins/editor/src/editor/NativeHelpers.h
@@ -8,3 +8,4 @@
 
 bool openFileInExternalEditor(const char *filename);
 bool openDirectoryInExplorer(const char *filename);
+bool askQuestion(const char *text);
diff --git a/plugins/editor/src/editor/NativeHelpers.mm b/plugins/editor/src/editor/NativeHelpers.mm
index 7fea74e8..56c1143d 100644
--- a/plugins/editor/src/editor/NativeHelpers.mm
+++ b/plugins/editor/src/editor/NativeHelpers.mm
@@ -31,4 +31,14 @@ bool openDirectoryInExplorer(const char *fileName)
 {
     return openFileWithApplication(fileName, @"Finder");
 }
+
+bool askQuestion(const char *text)
+{
+    NSAlert *alert = [[NSAlert alloc] init];
+    [alert setMessageText:[NSString stringWithUTF8String:text]];
+    [alert addButtonWithTitle:@"OK"];
+    [alert addButtonWithTitle:@"Cancel"];
+    NSInteger button = [alert runModal];
+    return button == NSAlertFirstButtonReturn;
+}
 #endif