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Add native notification box for errors on linux.

Errors will now be shown as a message box, instead of
only a console message. This fixes the user not seeing
error messages, like if the IWAD is not provided.

- Add zenity notification box call on I_Error

--- a/src/i_system.c

+++ b/src/i_system.c

@@ -262,6 +262,39 @@

     exit(0);

 }

+#define ZENITY_BINARY "/usr/bin/zenity"

+

+// returns non-zero if zenity is available

+

+static int ZenityAvailable(void)

+{

+    return system(ZENITY_BINARY " --help >/dev/null 2>&1") == 0;

+}

+

+// Open a native error box with a message using zenity

+

+static int ZenityErrorBox(char *message)

+{

+    int *result;

+    char *errorboxpath;

+    static size_t errorboxpath_size;

+

+    if (!ZenityAvailable())

+    {

+        return 0;

+    }

+

+    errorboxpath_size = strlen(ZENITY_BINARY) + strlen(message) + 19;

+    errorboxpath = malloc(errorboxpath_size);

+    M_snprintf(errorboxpath, errorboxpath_size, "%s --error --text=\"%s\"", ZENITY_BINARY, message);

+

+    result = system(errorboxpath);

+

+    free(errorboxpath);

+

+    return result;

+}

+

 //

 // I_Error

 //

@@ -327,9 +360,7 @@

         MessageBoxW(NULL, wmsgbuf, L"", MB_OK);

     }

-#endif

-

-#ifdef __MACOSX__

+#elif defined(__MACOSX__)

     if (exit_gui_popup && !I_ConsoleStdout())

     {

         CFStringRef message;

@@ -364,6 +395,11 @@

                                         CFSTR(PACKAGE_STRING),

                                         message,

                                         NULL);

+    }

+#else

+    if (exit_gui_popup && !I_ConsoleStdout())

+    {

+        ZenityErrorBox(error);

     }

 #endif