kNCurses/Window.cpp

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/**
* @author Christian Burger (christian@krikkel.de)
*/
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#include "Window.hpp"
#include "Debug.hpp"
#include <cstdio>
#include <unistd.h>
#include <sys/select.h>
#include <gsl/gsl>
#include <cctype>
#include <termios.h>
#include <fcntl.h>
namespace krikkel::NCursesPtyWindow
{
using gsl::narrow;
using std::lock_guard;
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Window::Window(int lines, int columns, int y, int x)
: NCursesWindow(lines, columns, y, x)
{
// to get the original terminal we need to shutdown ncurses for a moment
/// @todo maybe try `reset_prog_mode()` and `reset_shell_mode()` instead
::endwin();
tcgetattr(STDIN_FILENO, &terminalParameters);
::refresh();
winsize windowSize =
{
.ws_row = narrow<short unsigned int>(this->height())
, .ws_col = narrow<short unsigned int>(this->width())
};
openpty(&fdPtyHost, &fdPtyClient, NULL, &terminalParameters, &windowSize);
pseudoTerminal = vterm_new(windowSize.ws_row, windowSize.ws_col);
vterm_set_utf8(pseudoTerminal, true);
pseudoTerminalScreen = vterm_obtain_screen(pseudoTerminal);
vterm_screen_reset(pseudoTerminalScreen, true);
vterm_screen_set_callbacks(pseudoTerminalScreen, &screenCallbacks, this);
vterm_output_set_callback(pseudoTerminal, &staticHandlerOutput, this);
vterm_screen_enable_altscreen(pseudoTerminalScreen, true);
//raw(); //— cbreak might suffice
//noecho(); — already set
//nodelay(true); — @todo needs some reprogramming
keypad(true);
nonl();
/// @todo block all signals, this thread does not handle any
readPtyClientThread =
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std::thread(&Window::readFromPtyClientThreadMethod, this);
}
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Window::~Window()
{
close(fdPtyHost);
close(fdPtyClient);
vterm_free(pseudoTerminal);
}
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int Window::getFdPtyClient() const
{
return fdPtyClient;
}
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void Window::writeToClient(const char *output, size_t length)
{
lock_guard writeLock(writeToPseudoTerminalMutex);
write(fdPtyHost, output, length);
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__debug_log("written to PTY client: '" + __debug_make_bytes_printable(std::string(output, length)) + '\'');
}
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void Window::writeUnicodeCharToClient(wint_t character)
{
vterm_keyboard_unichar(pseudoTerminal, character, VTERM_MOD_NONE);
}
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void Window::writeKeyToClient(VTermKey key)
{
__debug_log("writing key: " + std::to_string(key));
vterm_keyboard_key(pseudoTerminal, key, VTERM_MOD_NONE);
}
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SingleUserInput Window::readSingleUserInput()
{
wint_t input;
int result = get_wch(&input);
return SingleUserInput(result, input);
}
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void Window::readFromPtyClientThreadMethod()
{
/// @todo in theory, there is no need for a timeout or select …
/// file descriptor is blocking
while(1)
{
readFromPtyClient();
struct timeval timeout = { .tv_sec = 0, .tv_usec = 200000 };
fd_set readFds;
FD_ZERO(&readFds);
FD_SET(fdPtyHost, &readFds);
if(select(fdPtyHost + 1, &readFds, NULL, NULL, &timeout) < 0)
break;
}
}
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void Window::readFromPtyClient()
{
size_t bytesRead = read(fdPtyHost, ptyClientOutputBuffer, PTY_CLIENT_OUTPUT_BUFFER_SIZE);
if(bytesRead != -1 && bytesRead != 0)
{
lock_guard writeLock(writeToPseudoTerminalMutex);
vterm_input_write(pseudoTerminal, ptyClientOutputBuffer, bytesRead);
}
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__debug_log("read from PTY client: '" + __debug_make_bytes_printable(std::string(ptyClientOutputBuffer, bytesRead)) + '\'');
}
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VTermScreenCallbacks Window::screenCallbacks =
{
.damage = staticHandlerDamage,
.moverect = staticHandlerMoveRect,
.movecursor = staticHandlerMoveCursor,
.settermprop = staticHandlerSetTermProp,
.bell = staticHandlerBell,
.resize = staticHandlerResize,
.sb_pushline = staticHandlerPushLine,
.sb_popline = staticHandlerPopLine,
};
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int Window::handlerDamage(VTermRect rect)
{
for(int x = rect.start_col; x < rect.end_col; ++x)
for(int y = rect.start_row; y < rect.end_row; ++y)
copyPtyCellToNCursesWindow(x, y);
refresh();
return 0;
}
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int Window::handlerMoveRect(VTermRect dest, VTermRect src)
{
__debug_log("(unimplemented) move content in rectangle from ("
+ std::to_string(src.start_col) + ", "
+ std::to_string(src.start_row) + ", "
+ std::to_string(src.end_col) + ", "
+ std::to_string(src.end_row) + ") "
+ "size: " + std::to_string((src.start_col - src.end_col) * (src.start_row - src.end_row))
+ " to ("
+ std::to_string(dest.start_col) + ", "
+ std::to_string(dest.start_row) + ", "
+ std::to_string(dest.end_col) + ", "
+ std::to_string(dest.end_row) + ") "
+ "size: " + std::to_string((dest.start_col - dest.end_col) * (dest.start_row - dest.end_row)));
return 0;
}
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int Window::handlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible)
{
/// @todo maybe use `mvcur()` instead?
cursorX = pos.col;
cursorY = pos.row;
refresh();
return 0;
}
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int Window::handlerSetTermProp(VTermProp prop, VTermValue *val)
{
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/// @todo maybe use "vterm_get_prop_type() —> bool, number, string"?
__debug_stringify_switch_begin(handlerSetTermProp, prop, val);
__debug_stringify_switch_case(VTERM_PROP_CURSORVISIBLE);
__debug_stringify_switch_case(VTERM_PROP_CURSORBLINK);
__debug_stringify_switch_case(VTERM_PROP_ALTSCREEN);
__debug_stringify_switch_case(VTERM_PROP_REVERSE);
__debug_stringify_switch_case_end_bool(val->boolean);
__debug_stringify_switch_case(VTERM_PROP_TITLE);
__debug_stringify_switch_case(VTERM_PROP_ICONNAME);
__debug_stringify_switch_case_end_string(val->string);
__debug_stringify_switch_case(VTERM_PROP_CURSORSHAPE);
__debug_stringify_switch_case(VTERM_PROP_MOUSE);
__debug_stringify_switch_case_end_number(val->number);
__debug_stringify_switch_end(prop);
__debug_log(std::string("unimplemented handler called: ")
+ __debug_stringify_get_string(handlerSetTermProp)
);
return 0;
}
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int Window::handlerBell()
{
beep();
return 0;
}
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int Window::handlerResize(int rows, int cols)
{
__debug_log("unimplemented handler called");
return 0;
}
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int Window::handlerPushLine(int cols, const VTermScreenCell *cells)
{
__debug_log("(unimplemented) push line with " + std::to_string(cols) + " columns");
return 0;
}
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int Window::handlerPopLine(int cols, VTermScreenCell *cells)
{
__debug_log("unimplemented handler called");
return 0;
}
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attr_t Window::extractAttributesFromVTermCell(VTermScreenCell vTermCell)
{
attr_t result = A_NORMAL;
//__debug_log("unimplemented method called");
return result;
}
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short Window::extractColorFromVTermCell(VTermScreenCell vTermCell)
{
//__debug_log("unimplemented method called");
return 0;
}
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void Window::copyPtyCellToNCursesWindow(int x, int y)
{
VTermPos cellPosition = {y, x};
VTermScreenCell vTermCell;
cchar_t converted;
attr_t formatting;
short colorPair;
wchar_t character;
vterm_screen_get_cell(pseudoTerminalScreen, cellPosition, &vTermCell);
formatting = extractAttributesFromVTermCell(vTermCell);
colorPair = extractColorFromVTermCell(vTermCell);
if(vTermCell.chars[0] == 0)
character = ' ';
else
character = *vTermCell.chars;
setcchar(&converted, &character, formatting, colorPair, NULL);
move(cellPosition.row, cellPosition.col);
chgat(1, formatting, colorPair, NULL);
add_wch(&converted);
}
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int Window::add_wch(const cchar_t *character)
{
return ::wadd_wch(w, character);
}
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int Window::get_wch(wint_t *character)
{
return ::wget_wch(w, character);
}
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int Window::refresh()
{
move(cursorY, cursorX);
return NCursesWindow::refresh();
}
/// @todo potential racing condition where drawing into terminal while
/// resizing?
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int Window::wresize(int rows, int cols)
{
std::lock_guard writeLock(writeToPseudoTerminalMutex);
winsize windowSize =
{
.ws_row = narrow<unsigned short>(rows)
, .ws_col = narrow<unsigned short>(cols)
};
ioctl(fdPtyHost, TIOCSWINSZ, &windowSize);
vterm_set_size(pseudoTerminal, rows, cols);
return NCursesWindow::wresize(rows, cols);
}
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int Window::staticHandlerDamage(VTermRect rect, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerDamage(rect);
}
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int Window::staticHandlerMoveRect(VTermRect dest, VTermRect src, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerMoveRect(dest, src);
}
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int Window::staticHandlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerMoveCursor(pos, oldpos, visible);
}
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int Window::staticHandlerSetTermProp(VTermProp prop, VTermValue *val, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerSetTermProp(prop, val);
}
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int Window::staticHandlerBell(void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerBell();
}
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int Window::staticHandlerResize(int rows, int cols, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerResize(rows, cols);
}
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int Window::staticHandlerPushLine(int cols, const VTermScreenCell *cells, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerPushLine(cols, cells);
}
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int Window::staticHandlerPopLine(int cols, VTermScreenCell *cells, void *user)
{
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Window *instance = static_cast<Window *>(user);
return instance->handlerPopLine(cols, cells);
}
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void Window::staticHandlerOutput(const char *s, size_t len, void *user)
{
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Window *instance = static_cast<Window *>(user);
__debug_log("output handler writing to client: '" + __debug_make_bytes_printable(std::string(s, len)) + "'");
instance->writeToClient(s, len);
}
}