win: Terminal UI #6315

For CI builds unibilium is provided through msys2 packages, and
libtermkey is built from source in third-party from equalsraf/libtermkey.

In Windows we cannot read terminal input from the stdin file descriptor,
instead use libuv's uv_tty API. It should handle key input and encoding.

The UI suspend is not implemented for Windows, because the
SIGSTP/SIGCONT do not exist in windows. Currently this is a NOOP.

Closes #3902
Closes #6640

3 files changed, 17 insertions, 0 deletions

diff --git a/src/nvim/tui/input.c b/src/nvim/tui/input.c
index 3d37fabeee..03587d68f0 100644
--- a/src/nvim/tui/input.c
+++ b/src/nvim/tui/input.c
@@ -47,7 +47,13 @@ void term_input_init(TermInput *input, Loop *loop)
   int curflags = termkey_get_canonflags(input->tk);
   termkey_set_canonflags(input->tk, curflags | TERMKEY_CANON_DELBS);
   // setup input handle
+#ifdef WIN32
+  uv_tty_init(loop, &input->tty_in, 0, 1);
+  uv_tty_set_mode(&input->tty_in, UV_TTY_MODE_RAW);
+  rstream_init_stream(&input->read_stream, &input->tty_in, 0xfff);
+#else
   rstream_init_fd(loop, &input->read_stream, input->in_fd, 0xfff);
+#endif
   // initialize a timer handle for handling ESC with libtermkey
   time_watcher_init(loop, &input->timer_handle, input);
 }
diff --git a/src/nvim/tui/input.h b/src/nvim/tui/input.h
index 7d59cf5c6a..573cc9d683 100644
--- a/src/nvim/tui/input.h
+++ b/src/nvim/tui/input.h
@@ -17,6 +17,9 @@ typedef struct term_input {
 #endif
   TimeWatcher timer_handle;
   Loop *loop;
+#ifdef WIN32
+  uv_tty_t tty_in;
+#endif
   Stream read_stream;
   RBuffer *key_buffer;
   uv_mutex_t key_buffer_mutex;
diff --git a/src/nvim/tui/tui.c b/src/nvim/tui/tui.c
index 522f7d59f2..e45c620176 100644
--- a/src/nvim/tui/tui.c
+++ b/src/nvim/tui/tui.c
@@ -251,7 +251,9 @@ static void tui_main(UIBridgeData *bridge, UI *ui)
   kv_init(data->invalid_regions);
   signal_watcher_init(data->loop, &data->winch_handle, ui);
   signal_watcher_init(data->loop, &data->cont_handle, data);
+#ifdef UNIX
   signal_watcher_start(&data->cont_handle, sigcont_cb, SIGCONT);
+#endif
   tui_terminal_start(ui);
   data->stop = false;
   // allow the main thread to continue, we are ready to start handling UI
@@ -280,10 +282,12 @@ static void tui_scheduler(Event event, void *d)
   loop_schedule(data->loop, event);
 }
 
+#ifdef UNIX
 static void sigcont_cb(SignalWatcher *watcher, int signum, void *data)
 {
   ((TUIData *)data)->cont_received = true;
 }
+#endif
 
 static void sigwinch_cb(SignalWatcher *watcher, int signum, void *data)
 {
@@ -744,6 +748,7 @@ static void tui_flush(UI *ui)
   flush_buf(ui, true);
 }
 
+#ifdef UNIX
 static void suspend_event(void **argv)
 {
   UI *ui = argv[0];
@@ -765,15 +770,18 @@ static void suspend_event(void **argv)
   // resume the main thread
   CONTINUE(data->bridge);
 }
+#endif
 
 static void tui_suspend(UI *ui)
 {
+#ifdef UNIX
   TUIData *data = ui->data;
   // kill(0, SIGTSTP) won't stop the UI thread, so we must poll for SIGCONT
   // before continuing. This is done in another callback to avoid
   // loop_poll_events recursion
   multiqueue_put_event(data->loop->fast_events,
                        event_create(suspend_event, 1, ui));
+#endif
 }
 
 static void tui_set_title(UI *ui, char *title)