add some basic terminal emulator stuff

1 files changed, 47 insertions, 2 deletions

diff --git a/main.c3 b/main.c3
index 26dd38a..cfe4894 100644
--- a/main.c3
+++ b/main.c3
@@ -7,19 +7,50 @@
 
 module main;
 import std::io;
+import std::os;
 import rgfw;
 import rsgl;
 import rfont;
+import libc::termios;
 
-fn int main(String[] args)
+faultdef FAIL_OPENPTY, FAIL_FORK;
+
+fn Window* init()
 {
   GlHints* hints = rgfw::getGlobalHints();
   hints.major = 3;
   hints.minor = 3;
   hints.profile = GlProfile.COMPATIBILITY;
   rgfw::setGlobalHints(hints);
+  return rgfw::createWindow("window title", 0, 0, 800, 400, WindowFlags.CENTER | WindowFlags.NO_RESIZE | WindowFlags.OPENGL);
+}
+
+fn int? init_tty()
+{
+  int master;
+  int slave;
+  if (openpty(&master, &slave, null, null, null) < 0) return FAIL_OPENPTY~;
+  Pid_t f = fork();
+  switch (f)
+  {
+    case -1:
+      return FAIL_FORK~;
+    case 0: // child
+      dup2(slave, 0);
+      dup2(slave, 1);
+      dup2(slave, 2);
+      os::exit(execvp(getenv("SHELL"), {null}));
+    default: // parent
+      return master;
+  }
+}
+
+fn int main(String[] args)
+{
+  init_tty()!!;
+
+  Window* window = init();
 
-  Window* window = rgfw::createWindow("window title", 0, 0, 800, 400, WindowFlags.CENTER | WindowFlags.NO_RESIZE | WindowFlags.OPENGL);
 
   rsgl::Renderer* renderer = rsgl::renderer_init(rsgl::gl::rendererProc(), &rgfw::getProcAddress);
   rsgl::renderer_viewport(renderer, rsgl::@rect(0,0,500,500));
@@ -52,3 +83,17 @@ fn int main(String[] args)
 
   return(0);
 }
+
+struct Winsize
+{
+  ushort ws_row;
+  ushort ws_column;
+  ushort ws_xpixel;
+  ushort ws_ypixel;
+}
+
+extern fn CInt    dup2(CInt, CInt);
+extern fn CInt    execvp(ZString, ZString[]);
+extern fn Pid_t   fork();
+extern fn ZString getenv(ZString);
+extern fn CInt    openpty(CInt*, CInt*, ZString, Termios*, Winsize*);