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win32: use native ANSI sequence processing, if possible #4700

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merged 1 commit into from
Dec 2, 2023
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win32: use native ANSI sequence processing, if possible #4700

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35 changes: 35 additions & 0 deletions compat/winansi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -594,6 +594,38 @@ static void detect_msys_tty(int fd)

#endif

static HANDLE std_console_handle;
static DWORD std_console_mode;

static void reset_std_console_mode(void)
{
SetConsoleMode(std_console_handle, std_console_mode);
}

static int enable_virtual_processing(void)
{
std_console_handle = GetStdHandle(STD_OUTPUT_HANDLE);
if (std_console_handle == INVALID_HANDLE_VALUE ||
!GetConsoleMode(std_console_handle, &std_console_mode)) {
std_console_handle = GetStdHandle(STD_ERROR_HANDLE);
if (std_console_handle == INVALID_HANDLE_VALUE ||
!GetConsoleMode(std_console_handle, &std_console_mode))
return 0;
}

if (std_console_mode & ENABLE_VIRTUAL_TERMINAL_PROCESSING)
return 1;

if (!SetConsoleMode(std_console_handle,
std_console_mode |
ENABLE_PROCESSED_OUTPUT |
ENABLE_VIRTUAL_TERMINAL_PROCESSING))
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return 0;

atexit(reset_std_console_mode);
return 1;
}

/*
* Wrapper for isatty(). Most calls in the main git code
* call isatty(1 or 2) to see if the instance is interactive
Expand Down Expand Up @@ -632,6 +664,9 @@ void winansi_init(void)
return;
}

if (enable_virtual_processing())
return;

/* create a named pipe to communicate with the console thread */
if (swprintf(name, ARRAY_SIZE(name) - 1, L"\\\\.\\pipe\\winansi%lu",
GetCurrentProcessId()) < 0)
Expand Down