unix: add uv_guess_handle and uv_tty_get_winsize

include/uv.h

@@ -624,6 +624,17 @@ int uv_tty_init(uv_loop_t*, uv_tty_t*, uv_file fd);
  */
 int uv_tty_set_mode(uv_tty_t*, int mode);
 
+/*
+ * Gets the current Window size. On success zero is returned.
+ */
+int uv_tty_get_winsize(uv_tty_t*, int* width, int* height);
+
+/*
+ * Used to detect what type of stream should be used with a given file
+ * descriptor. Usually this will be used during initialization to guess the
+ * type of the stdio streams.
+ */
+uv_handle_type uv_guess_handle(uv_file file);
 
 /*
  * uv_pipe_t is a subclass of uv_stream_t

src/unix/tty.c

@@ -72,3 +72,43 @@ fatal:
 int uv_is_tty(uv_file file) {
   return isatty(file);
 }
+
+
+int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
+  struct winsize ws;
+
+  if (ioctl(tty->fd, TIOCGWINSZ, &ws) < 0) {
+    uv_err_new(tty->loop, errno);
+    return -1;
+  }
+
+  *width = ws.ws_col;
+  *height = ws.ws_row;
+
+  return 0;
+}
+
+
+uv_handle_type uv_guess_handle(uv_file file) {
+  struct stat s;
+
+  if (file < 0) {
+    uv_err_new(NULL, EINVAL); /* XXX Need loop? */
+    return -1;
+  }
+
+  if (isatty(file)) {
+    return UV_TTY;
+  }
+
+  if (fstat(file, &s)) {
+    uv_err_new(NULL, errno); /* XXX Need loop? */
+    return -1;
+  }
+
+  if (!S_ISSOCK(s.st_mode) && !S_ISFIFO(s.st_mode)) {
+    return UV_FILE;
+  }
+
+  return UV_NAMED_PIPE;
+}

src/win/tty.c

@@ -42,3 +42,15 @@ int uv_is_tty(uv_file file) {
   int r = GetConsoleMode((HANDLE)_get_osfhandle(file), &result);
   return r ? 1 : 0;
 }
+
+
+int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
+  assert(0 && "implement me");
+  return -1;
+}
+
+
+uv_handle_type uv_guess_handle(uv_file file) {
+  assert(0 && "implement me");
+  return UV_UNKNOWN_HANDLE;
+}

test/test-tty.c

@@ -23,10 +23,35 @@
 #include "task.h"
 
 TEST_IMPL(tty) {
+  int r, width, height;
+  uv_tty_t tty;
   uv_loop_t* loop = uv_default_loop();
 
+  /*
+   * Not necessarally a problem if this assert goes off. E.G you are piping
+   * this test to a file. 0 == stdin.
+   */
   ASSERT(uv_is_tty(0) == 1);
 
+  r = uv_tty_init(uv_default_loop(), &tty, 0);
+  ASSERT(r == 0);
+
+  ASSERT(UV_TTY == uv_guess_handle(0));
+
+  r = uv_tty_get_winsize(&tty, &width, &height);
+  ASSERT(r == 0);
+
+  printf("width=%d height=%d\n", width, height);
+
+  /*
+   * Is it a safe assumption that most people have terminals larger than
+   * 10x10?
+   */
+  ASSERT(width > 10);
+  ASSERT(height > 10);
+
+  uv_close((uv_handle_t*)&tty, NULL);
+
   uv_run(loop);
 
   return 0;