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

7 files changed, 60 insertions, 18 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b49d79499..03b13404a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -324,11 +324,7 @@ if(MSGPACK_HAS_FLOAT32)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNVIM_MSGPACK_HAS_FLOAT32")
 endif()
 
-if(UNIX)
-  option(FEAT_TUI "Enable the Terminal UI" ON)
-else()
-  option(FEAT_TUI "Enable the Terminal UI" OFF)
-endif()
+option(FEAT_TUI "Enable the Terminal UI" ON)
 
 if(FEAT_TUI)
   find_package(Unibilium REQUIRED)
diff --git a/ci/build.bat b/ci/build.bat
index 9071c0864e..bc110396ef 100644
--- a/ci/build.bat
+++ b/ci/build.bat
@@ -17,7 +17,7 @@ set PATH=C:\Program Files (x86)\CMake\bin\cpack.exe;%PATH%
 
 :: Build third-party dependencies
 C:\msys64\usr\bin\bash -lc "pacman --verbose --noconfirm -Su" || goto :error
-C:\msys64\usr\bin\bash -lc "pacman --verbose --noconfirm --needed -S mingw-w64-%ARCH%-cmake mingw-w64-%ARCH%-perl mingw-w64-%ARCH%-diffutils gperf" || goto :error
+C:\msys64\usr\bin\bash -lc "pacman --verbose --noconfirm --needed -S mingw-w64-%ARCH%-cmake mingw-w64-%ARCH%-perl mingw-w64-%ARCH%-diffutils mingw-w64-%ARCH%-unibilium gperf" || goto :error
 
 :: Setup python (use AppVeyor system python)
 C:\Python27\python.exe -m pip install neovim || goto :error
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)
diff --git a/third-party/CMakeLists.txt b/third-party/CMakeLists.txt
index d58ad1755a..b8dad75b24 100644
--- a/third-party/CMakeLists.txt
+++ b/third-party/CMakeLists.txt
@@ -105,8 +105,13 @@ set(LUAROCKS_SHA256 cae709111c5701235770047dfd7169f66b82ae1c7b9b79207f9df0afb722
 set(UNIBILIUM_URL https://github.com/mauke/unibilium/archive/v1.2.0.tar.gz)
 set(UNIBILIUM_SHA256 623af1099515e673abfd3cae5f2fa808a09ca55dda1c65a7b5c9424eb304ead8)
 
+if(WIN32)
+set(LIBTERMKEY_URL https://github.com/equalsraf/libtermkey/archive/tb-windows.zip)
+set(LIBTERMKEY_SHA256 c81e33e38662b151a49847ff4feef4f8c4b2a66f3e159a28b575cbc9bcd8ffea)
+else()
 set(LIBTERMKEY_URL http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.19.tar.gz)
 set(LIBTERMKEY_SHA256 c505aa4cb48c8fa59c526265576b97a19e6ebe7b7da20f4ecaae898b727b48b7)
+endif()
 
 set(LIBVTERM_URL https://github.com/neovim/libvterm/archive/a9c7c6fd20fa35e0ad3e0e98901ca12dfca9c25c.tar.gz)
 set(LIBVTERM_SHA256 1a4272be91d9614dc183a503786df83b6584e4afaab7feaaa5409f841afbd796)
diff --git a/third-party/cmake/BuildLibtermkey.cmake b/third-party/cmake/BuildLibtermkey.cmake
index 57e14d36d3..4b581c2a01 100644
--- a/third-party/cmake/BuildLibtermkey.cmake
+++ b/third-party/cmake/BuildLibtermkey.cmake
@@ -1,21 +1,41 @@
-if(WIN32)
-  message(STATUS "Building libtermkey in Windows is not supported (skipping)")
-  return()
-endif()
 find_package(PkgConfig REQUIRED)
 
+if(WIN32)
+ExternalProject_Add(libtermkey
+  PREFIX ${DEPS_BUILD_DIR}
+  URL ${LIBTERMKEY_URL}
+  DOWNLOAD_DIR ${DEPS_DOWNLOAD_DIR}/libtermkey
+  DOWNLOAD_COMMAND ${CMAKE_COMMAND}
+  -DPREFIX=${DEPS_BUILD_DIR}
+  -DDOWNLOAD_DIR=${DEPS_DOWNLOAD_DIR}/libtermkey
+  -DURL=${LIBTERMKEY_URL}
+  -DEXPECTED_SHA256=${LIBTERMKEY_SHA256}
+  -DTARGET=libtermkey
+  -DUSE_EXISTING_SRC_DIR=${USE_EXISTING_SRC_DIR}
+  -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/DownloadAndExtractFile.cmake
+  CONFIGURE_COMMAND ${CMAKE_COMMAND} ${DEPS_BUILD_DIR}/src/libtermkey
+    -DCMAKE_INSTALL_PREFIX=${DEPS_INSTALL_DIR}
+    # Pass toolchain
+    -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN}
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+    # Hack to avoid -rdynamic in Mingw
+    -DCMAKE_SHARED_LIBRARY_LINK_C_FLAGS=""
+    -DCMAKE_GENERATOR=${CMAKE_GENERATOR}
+  BUILD_COMMAND ${CMAKE_COMMAND} --build . --config ${CMAKE_BUILD_TYPE}
+  INSTALL_COMMAND ${CMAKE_COMMAND} --build . --target install --config ${CMAKE_BUILD_TYPE})
+else()
 ExternalProject_Add(libtermkey
   PREFIX ${DEPS_BUILD_DIR}
   URL ${LIBTERMKEY_URL}
   DOWNLOAD_DIR ${DEPS_DOWNLOAD_DIR}/libtermkey
   DOWNLOAD_COMMAND ${CMAKE_COMMAND}
-    -DPREFIX=${DEPS_BUILD_DIR}
-    -DDOWNLOAD_DIR=${DEPS_DOWNLOAD_DIR}/libtermkey
-    -DURL=${LIBTERMKEY_URL}
-    -DEXPECTED_SHA256=${LIBTERMKEY_SHA256}
-    -DTARGET=libtermkey
-    -DUSE_EXISTING_SRC_DIR=${USE_EXISTING_SRC_DIR}
-    -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/DownloadAndExtractFile.cmake
+  -DPREFIX=${DEPS_BUILD_DIR}
+  -DDOWNLOAD_DIR=${DEPS_DOWNLOAD_DIR}/libtermkey
+  -DURL=${LIBTERMKEY_URL}
+  -DEXPECTED_SHA256=${LIBTERMKEY_SHA256}
+  -DTARGET=libtermkey
+  -DUSE_EXISTING_SRC_DIR=${USE_EXISTING_SRC_DIR}
+  -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/DownloadAndExtractFile.cmake
   CONFIGURE_COMMAND ""
   BUILD_IN_SOURCE 1
   BUILD_COMMAND ""
@@ -24,6 +44,10 @@ ExternalProject_Add(libtermkey
                               PKG_CONFIG_PATH=${DEPS_LIB_DIR}/pkgconfig
                               CFLAGS=-fPIC
                               install)
+endif()
 
 list(APPEND THIRD_PARTY_DEPS libtermkey)
-add_dependencies(libtermkey unibilium)
+if(NOT WIN32)
+  # There is no unibilium build recipe for Windows yet
+  add_dependencies(libtermkey unibilium)
+endif()