Merge #7007 'Windows :terminal'

References #6383
Closes #4748

15 files changed, 593 insertions, 106 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 594f631ba0..17e14bcbd0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -351,6 +351,11 @@ endif()
 find_package(LibVterm REQUIRED)
 include_directories(SYSTEM ${LIBVTERM_INCLUDE_DIRS})
 
+if(WIN32)
+  find_package(Winpty REQUIRED)
+  include_directories(SYSTEM ${WINPTY_INCLUDE_DIRS})
+endif()
+
 option(CLANG_ASAN_UBSAN "Enable Clang address & undefined behavior sanitizer for nvim binary." OFF)
 option(CLANG_MSAN "Enable Clang memory sanitizer for nvim binary." OFF)
 option(CLANG_TSAN "Enable Clang thread sanitizer for nvim binary." OFF)
diff --git a/cmake/FindWinpty.cmake b/cmake/FindWinpty.cmake
new file mode 100644
index 0000000000..8feafc58a8
--- /dev/null
+++ b/cmake/FindWinpty.cmake
@@ -0,0 +1,10 @@
+include(LibFindMacros)
+
+find_path(WINPTY_INCLUDE_DIR winpty.h)
+set(WINPTY_INCLUDE_DIRS ${WINPTY_INCLUDE_DIR})
+
+find_library(WINPTY_LIBRARY winpty)
+find_program(WINPTY_AGENT_EXE winpty-agent.exe)
+set(WINPTY_LIBRARIES ${WINPTY_LIBRARY})
+
+find_package_handle_standard_args(Winpty DEFAULT_MSG WINPTY_LIBRARY WINPTY_INCLUDE_DIR)
diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index c46c0bed6d..688912eda6 100644
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -111,6 +111,9 @@ foreach(sfile ${NVIM_SOURCES})
   if(WIN32 AND ${f} MATCHES "^(pty_process_unix.c)$")
     list(APPEND to_remove ${sfile})
   endif()
+  if(NOT WIN32 AND ${f} MATCHES "^(pty_process_win.c)$")
+    list(APPEND to_remove ${sfile})
+  endif()
 endforeach()
 
 list(REMOVE_ITEM NVIM_SOURCES ${to_remove})
@@ -350,6 +353,10 @@ if(Iconv_LIBRARIES)
   list(APPEND NVIM_LINK_LIBRARIES ${Iconv_LIBRARIES})
 endif()
 
+if(WIN32)
+  list(APPEND NVIM_LINK_LIBRARIES ${WINPTY_LIBRARIES})
+endif()
+
 # Put these last on the link line, since multiple things may depend on them.
 list(APPEND NVIM_LINK_LIBRARIES
   ${LIBUV_LIBRARIES}
@@ -415,6 +422,7 @@ if(WIN32)
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/tee.exe"             ${PROJECT_BINARY_DIR}/windows_runtime_deps/
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/tidy.exe"            ${PROJECT_BINARY_DIR}/windows_runtime_deps/
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/win32yank.exe"       ${PROJECT_BINARY_DIR}/windows_runtime_deps/
+    COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/winpty-agent.exe"    ${PROJECT_BINARY_DIR}/windows_runtime_deps/
 
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/D3Dcompiler_47.dll"  ${PROJECT_BINARY_DIR}/windows_runtime_deps/
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/libEGL.dll"          ${PROJECT_BINARY_DIR}/windows_runtime_deps/
@@ -428,6 +436,7 @@ if(WIN32)
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/Qt5Network.dll"      ${PROJECT_BINARY_DIR}/windows_runtime_deps/
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/Qt5Svg.dll"          ${PROJECT_BINARY_DIR}/windows_runtime_deps/
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/Qt5Widgets.dll"      ${PROJECT_BINARY_DIR}/windows_runtime_deps/
+    COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/winpty.dll"          ${PROJECT_BINARY_DIR}/windows_runtime_deps/
 
     COMMAND ${CMAKE_COMMAND} -E copy "${DEPS_PREFIX}/bin/platforms/qwindows.dll" ${PROJECT_BINARY_DIR}/windows_runtime_deps/platforms/
     )
@@ -526,6 +535,7 @@ endfunction()
 
 set(NO_SINGLE_CHECK_HEADERS
   os/win_defs.h
+  os/pty_process_win.h
   regexp_defs.h
   syntax_defs.h
   terminal.h
diff --git a/src/nvim/os/pty_process_win.c b/src/nvim/os/pty_process_win.c
new file mode 100644
index 0000000000..ef8a699c56
--- /dev/null
+++ b/src/nvim/os/pty_process_win.c
@@ -0,0 +1,410 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <winpty_constants.h>
+
+#include "nvim/os/os.h"
+#include "nvim/ascii.h"
+#include "nvim/memory.h"
+#include "nvim/mbyte.h"  // for utf8_to_utf16, utf16_to_utf8
+#include "nvim/os/pty_process_win.h"
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "os/pty_process_win.c.generated.h"
+#endif
+
+static void CALLBACK pty_process_finish1(void *context, BOOLEAN unused)
+  FUNC_ATTR_NONNULL_ALL
+{
+  PtyProcess *ptyproc = (PtyProcess *)context;
+  Process *proc = (Process *)ptyproc;
+
+  uv_timer_init(&proc->loop->uv, &ptyproc->wait_eof_timer);
+  ptyproc->wait_eof_timer.data = (void *)ptyproc;
+  uv_timer_start(&ptyproc->wait_eof_timer, wait_eof_timer_cb, 200, 200);
+}
+
+/// @returns zero on success, or negative error code.
+int pty_process_spawn(PtyProcess *ptyproc)
+  FUNC_ATTR_NONNULL_ALL
+{
+  Process *proc = (Process *)ptyproc;
+  int status = 0;
+  winpty_error_ptr_t err = NULL;
+  winpty_config_t *cfg = NULL;
+  winpty_spawn_config_t *spawncfg = NULL;
+  winpty_t *winpty_object = NULL;
+  char *in_name = NULL;
+  char *out_name = NULL;
+  HANDLE process_handle = NULL;
+  uv_connect_t *in_req = NULL;
+  uv_connect_t *out_req = NULL;
+  wchar_t *cmd_line = NULL;
+  wchar_t *cwd = NULL;
+  const char *emsg = NULL;
+
+  assert(!proc->err);
+
+  cfg = winpty_config_new(WINPTY_FLAG_ALLOW_CURPROC_DESKTOP_CREATION, &err);
+  if (cfg == NULL) {
+    emsg = "Failed, winpty_config_new.";
+    goto cleanup;
+  }
+
+  winpty_config_set_initial_size(cfg, ptyproc->width, ptyproc->height);
+  winpty_object = winpty_open(cfg, &err);
+  if (winpty_object == NULL) {
+    emsg = "Failed, winpty_open.";
+    goto cleanup;
+  }
+
+  status = utf16_to_utf8(winpty_conin_name(winpty_object), &in_name);
+  if (status != 0) {
+    emsg = "Failed to convert in_name from utf16 to utf8.";
+    goto cleanup;
+  }
+
+  status = utf16_to_utf8(winpty_conout_name(winpty_object), &out_name);
+  if (status != 0) {
+    emsg = "Failed to convert out_name from utf16 to utf8.";
+    goto cleanup;
+  }
+
+  if (proc->in != NULL) {
+    in_req = xmalloc(sizeof(uv_connect_t));
+    uv_pipe_connect(
+        in_req,
+        &proc->in->uv.pipe,
+        in_name,
+        pty_process_connect_cb);
+  }
+
+  if (proc->out != NULL) {
+    out_req = xmalloc(sizeof(uv_connect_t));
+    uv_pipe_connect(
+        out_req,
+        &proc->out->uv.pipe,
+        out_name,
+        pty_process_connect_cb);
+  }
+
+  if (proc->cwd != NULL) {
+    status = utf8_to_utf16(proc->cwd, &cwd);
+    if (status != 0) {
+      emsg = "Failed to convert pwd form utf8 to utf16.";
+      goto cleanup;
+    }
+  }
+
+  status = build_cmd_line(proc->argv, &cmd_line,
+                          os_shell_is_cmdexe(proc->argv[0]));
+  if (status != 0) {
+    emsg = "Failed to convert cmd line form utf8 to utf16.";
+    goto cleanup;
+  }
+
+  spawncfg = winpty_spawn_config_new(
+      WINPTY_SPAWN_FLAG_AUTO_SHUTDOWN,
+      NULL,  // Optional application name
+      cmd_line,
+      cwd,
+      NULL,  // Optional environment variables
+      &err);
+  if (spawncfg == NULL) {
+    emsg = "Failed winpty_spawn_config_new.";
+    goto cleanup;
+  }
+
+  DWORD win_err = 0;
+  if (!winpty_spawn(winpty_object,
+                    spawncfg,
+                    &process_handle,
+                    NULL,  // Optional thread handle
+                    &win_err,
+                    &err)) {
+    if (win_err) {
+      status = (int)win_err;
+      emsg = "Failed spawn process.";
+    } else {
+      emsg = "Failed winpty_spawn.";
+    }
+    goto cleanup;
+  }
+  proc->pid = GetProcessId(process_handle);
+
+  if (!RegisterWaitForSingleObject(
+      &ptyproc->finish_wait,
+      process_handle,
+      pty_process_finish1,
+      ptyproc,
+      INFINITE,
+      WT_EXECUTEDEFAULT | WT_EXECUTEONLYONCE)) {
+    abort();
+  }
+
+  // Wait until pty_process_connect_cb is called.
+  while ((in_req != NULL && in_req->handle != NULL)
+         || (out_req != NULL && out_req->handle != NULL)) {
+    uv_run(&proc->loop->uv, UV_RUN_ONCE);
+  }
+
+  ptyproc->winpty_object = winpty_object;
+  ptyproc->process_handle = process_handle;
+  winpty_object = NULL;
+  process_handle = NULL;
+
+cleanup:
+  if (status) {
+    // In the case of an error of MultiByteToWideChar or CreateProcessW.
+    ELOG("%s error code: %d", emsg, status);
+    status = os_translate_sys_error(status);
+  } else if (err != NULL) {
+    status = (int)winpty_error_code(err);
+    ELOG("%s error code: %d", emsg, status);
+    status = translate_winpty_error(status);
+  }
+  winpty_error_free(err);
+  winpty_config_free(cfg);
+  winpty_spawn_config_free(spawncfg);
+  winpty_free(winpty_object);
+  xfree(in_name);
+  xfree(out_name);
+  if (process_handle != NULL) {
+    CloseHandle(process_handle);
+  }
+  xfree(in_req);
+  xfree(out_req);
+  xfree(cmd_line);
+  xfree(cwd);
+  return status;
+}
+
+void pty_process_resize(PtyProcess *ptyproc, uint16_t width,
+                        uint16_t height)
+  FUNC_ATTR_NONNULL_ALL
+{
+  if (ptyproc->winpty_object != NULL) {
+    winpty_set_size(ptyproc->winpty_object, width, height, NULL);
+  }
+}
+
+void pty_process_close(PtyProcess *ptyproc)
+  FUNC_ATTR_NONNULL_ALL
+{
+  Process *proc = (Process *)ptyproc;
+
+  pty_process_close_master(ptyproc);
+
+  if (proc->internal_close_cb) {
+    proc->internal_close_cb(proc);
+  }
+}
+
+void pty_process_close_master(PtyProcess *ptyproc)
+  FUNC_ATTR_NONNULL_ALL
+{
+  if (ptyproc->winpty_object != NULL) {
+    winpty_free(ptyproc->winpty_object);
+    ptyproc->winpty_object = NULL;
+  }
+}
+
+void pty_process_teardown(Loop *loop)
+  FUNC_ATTR_NONNULL_ALL
+{
+}
+
+static void pty_process_connect_cb(uv_connect_t *req, int status)
+  FUNC_ATTR_NONNULL_ALL
+{
+  assert(status == 0);
+  req->handle = NULL;
+}
+
+static void wait_eof_timer_cb(uv_timer_t *wait_eof_timer)
+  FUNC_ATTR_NONNULL_ALL
+{
+  PtyProcess *ptyproc = wait_eof_timer->data;
+  Process *proc = (Process *)ptyproc;
+
+  if (!proc->out || !uv_is_readable(proc->out->uvstream)) {
+    uv_timer_stop(&ptyproc->wait_eof_timer);
+    pty_process_finish2(ptyproc);
+  }
+}
+
+static void pty_process_finish2(PtyProcess *ptyproc)
+  FUNC_ATTR_NONNULL_ALL
+{
+  Process *proc = (Process *)ptyproc;
+
+  UnregisterWaitEx(ptyproc->finish_wait, NULL);
+  uv_close((uv_handle_t *)&ptyproc->wait_eof_timer, NULL);
+
+  DWORD exit_code = 0;
+  GetExitCodeProcess(ptyproc->process_handle, &exit_code);
+  proc->status = (int)exit_code;
+
+  CloseHandle(ptyproc->process_handle);
+  ptyproc->process_handle = NULL;
+
+  proc->internal_exit_cb(proc);
+}
+
+/// Build the command line to pass to CreateProcessW.
+///
+/// @param[in]  argv  Array with string arguments.
+/// @param[out]  cmd_line  Location where saved builded cmd line.
+///
+/// @returns zero on success, or error code of MultiByteToWideChar function.
+///
+static int build_cmd_line(char **argv, wchar_t **cmd_line, bool is_cmdexe)
+  FUNC_ATTR_NONNULL_ALL
+{
+  size_t utf8_cmd_line_len = 0;
+  size_t argc = 0;
+  QUEUE args_q;
+
+  QUEUE_INIT(&args_q);
+  while (*argv) {
+    size_t buf_len = is_cmdexe ? (strlen(*argv) + 1) : (strlen(*argv) * 2 + 3);
+    ArgNode *arg_node = xmalloc(sizeof(*arg_node));
+    arg_node->arg = xmalloc(buf_len);
+    if (is_cmdexe) {
+      xstrlcpy(arg_node->arg, *argv, buf_len);
+    } else {
+      quote_cmd_arg(arg_node->arg, buf_len, *argv);
+    }
+    utf8_cmd_line_len += strlen(arg_node->arg);
+    QUEUE_INIT(&arg_node->node);
+    QUEUE_INSERT_TAIL(&args_q, &arg_node->node);
+    argc++;
+    argv++;
+  }
+
+  utf8_cmd_line_len += argc;
+  char *utf8_cmd_line = xmalloc(utf8_cmd_line_len);
+  *utf8_cmd_line = NUL;
+  while (1) {
+    QUEUE *head = QUEUE_HEAD(&args_q);
+    QUEUE_REMOVE(head);
+    ArgNode *arg_node = QUEUE_DATA(head, ArgNode, node);
+    xstrlcat(utf8_cmd_line, arg_node->arg, utf8_cmd_line_len);
+    xfree(arg_node->arg);
+    xfree(arg_node);
+    if (QUEUE_EMPTY(&args_q)) {
+      break;
+    } else {
+      xstrlcat(utf8_cmd_line, " ", utf8_cmd_line_len);
+    }
+  }
+
+  int result = utf8_to_utf16(utf8_cmd_line, cmd_line);
+  xfree(utf8_cmd_line);
+  return result;
+}
+
+/// Emulate quote_cmd_arg of libuv and quotes command line argument.
+/// Most of the code came from libuv.
+///
+/// @param[out]  dest  Location where saved quotes argument.
+/// @param  dest_remaining  Destination buffer size.
+/// @param[in]  src Pointer to argument.
+///
+static void quote_cmd_arg(char *dest, size_t dest_remaining, const char *src)
+  FUNC_ATTR_NONNULL_ALL
+{
+  size_t src_len = strlen(src);
+  bool quote_hit = true;
+  char *start = dest;
+
+  if (src_len == 0) {
+    // Need double quotation for empty argument.
+    snprintf(dest, dest_remaining, "\"\"");
+    return;
+  }
+
+  if (NULL == strpbrk(src, " \t\"")) {
+    // No quotation needed.
+    xstrlcpy(dest, src, dest_remaining);
+    return;
+  }
+
+  if (NULL == strpbrk(src, "\"\\")) {
+    // No embedded double quotes or backlashes, so I can just wrap quote marks.
+    // around the whole thing.
+    snprintf(dest, dest_remaining, "\"%s\"", src);
+    return;
+  }
+
+  // Expected input/output:
+  //   input : hello"world
+  //   output: "hello\"world"
+  //   input : hello""world
+  //   output: "hello\"\"world"
+  //   input : hello\world
+  //   output: hello\world
+  //   input : hello\\world
+  //   output: hello\\world
+  //   input : hello\"world
+  //   output: "hello\\\"world"
+  //   input : hello\\"world
+  //   output: "hello\\\\\"world"
+  //   input : hello world\
+  //   output: "hello world\\"
+
+  assert(dest_remaining--);
+  *(dest++) = NUL;
+  assert(dest_remaining--);
+  *(dest++) = '"';
+  for (size_t i = src_len; i > 0; i--) {
+    assert(dest_remaining--);
+    *(dest++) = src[i - 1];
+    if (quote_hit && src[i - 1] == '\\') {
+      assert(dest_remaining--);
+      *(dest++) = '\\';
+    } else if (src[i - 1] == '"') {
+      quote_hit = true;
+      assert(dest_remaining--);
+      *(dest++) = '\\';
+    } else {
+      quote_hit = false;
+    }
+  }
+  assert(dest_remaining);
+  *dest = '"';
+
+  while (start < dest) {
+    char tmp = *start;
+    *start = *dest;
+    *dest = tmp;
+    start++;
+    dest--;
+  }
+}
+
+/// Translate winpty error code to libuv error.
+///
+/// @param[in]  winpty_errno  Winpty error code returned by winpty_error_code
+///                           function.
+///
+/// @returns  Error code of libuv error.
+int translate_winpty_error(int winpty_errno)
+{
+  if (winpty_errno <= 0) {
+    return winpty_errno;  // If < 0 then it's already a libuv error.
+  }
+
+  switch (winpty_errno) {
+    case WINPTY_ERROR_OUT_OF_MEMORY:                return UV_ENOMEM;
+    case WINPTY_ERROR_SPAWN_CREATE_PROCESS_FAILED:  return UV_EAI_FAIL;
+    case WINPTY_ERROR_LOST_CONNECTION:              return UV_ENOTCONN;
+    case WINPTY_ERROR_AGENT_EXE_MISSING:            return UV_ENOENT;
+    case WINPTY_ERROR_UNSPECIFIED:                   return UV_UNKNOWN;
+    case WINPTY_ERROR_AGENT_DIED:                   return UV_ESRCH;
+    case WINPTY_ERROR_AGENT_TIMEOUT:                return UV_ETIMEDOUT;
+    case WINPTY_ERROR_AGENT_CREATION_FAILED:        return UV_EAI_FAIL;
+    default:                                        return UV_UNKNOWN;
+  }
+}
diff --git a/src/nvim/os/pty_process_win.h b/src/nvim/os/pty_process_win.h
index 8e2b37a1c1..1a4019e654 100644
--- a/src/nvim/os/pty_process_win.h
+++ b/src/nvim/os/pty_process_win.h
@@ -1,20 +1,27 @@
 #ifndef NVIM_OS_PTY_PROCESS_WIN_H
 #define NVIM_OS_PTY_PROCESS_WIN_H
 
-#include "nvim/event/libuv_process.h"
+#include <uv.h>
+#include <winpty.h>
+
+#include "nvim/event/process.h"
+#include "nvim/lib/queue.h"
 
 typedef struct pty_process {
   Process process;
   char *term_name;
   uint16_t width, height;
+  winpty_t *winpty_object;
+  HANDLE finish_wait;
+  HANDLE process_handle;
+  uv_timer_t wait_eof_timer;
 } PtyProcess;
 
-#define pty_process_spawn(job) libuv_process_spawn((LibuvProcess *)job)
-#define pty_process_close(job) libuv_process_close((LibuvProcess *)job)
-#define pty_process_close_master(job) libuv_process_close((LibuvProcess *)job)
-#define pty_process_resize(job, width, height) ( \
-    (void)job, (void)width, (void)height, 0)
-#define pty_process_teardown(loop) ((void)loop, 0)
+// Structure used by build_cmd_line()
+typedef struct arg_node {
+  char *arg;  // pointer to argument.
+  QUEUE node;  // QUEUE structure.
+} ArgNode;
 
 static inline PtyProcess pty_process_init(Loop *loop, void *data)
 {
@@ -23,7 +30,14 @@ static inline PtyProcess pty_process_init(Loop *loop, void *data)
   rv.term_name = NULL;
   rv.width = 80;
   rv.height = 24;
+  rv.winpty_object = NULL;
+  rv.finish_wait = NULL;
+  rv.process_handle = NULL;
   return rv;
 }
 
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "os/pty_process_win.h.generated.h"
+#endif
+
 #endif  // NVIM_OS_PTY_PROCESS_WIN_H
diff --git a/test/functional/fixtures/tty-test.c b/test/functional/fixtures/tty-test.c
index 7ba21d652a..edcbe23f86 100644
--- a/test/functional/fixtures/tty-test.c
+++ b/test/functional/fixtures/tty-test.c
@@ -5,42 +5,45 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <uv.h>
+#ifdef _WIN32
+# include <windows.h>
+#else
+# include <unistd.h>
+#endif
 
 // -V:STRUCT_CAST:641
 #define STRUCT_CAST(Type, obj) ((Type *)(obj))
+#define is_terminal(stream) (uv_guess_handle(fileno(stream)) == UV_TTY)
+#define BUF_SIZE 0xfff
+#define CTRL_C 0x03
 
 uv_tty_t tty;
+uv_tty_t tty_out;
 
-#ifdef _WIN32
-#include <windows.h>
 bool owns_tty(void)
 {
-  HWND consoleWnd = GetConsoleWindow();
-  DWORD dwProcessId;
-  GetWindowThreadProcessId(consoleWnd, &dwProcessId);
-  return GetCurrentProcessId() == dwProcessId;
-}
+#ifdef _WIN32
+  // XXX: We need to make proper detect owns tty
+  // HWND consoleWnd = GetConsoleWindow();
+  // DWORD dwProcessId;
+  // GetWindowThreadProcessId(consoleWnd, &dwProcessId);
+  // return GetCurrentProcessId() == dwProcessId;
+  return true;
 #else
-#include <unistd.h>
-bool owns_tty(void)
-{
   return getsid(0) == getpid();
-}
 #endif
+}
 
-#define is_terminal(stream) (uv_guess_handle(fileno(stream)) == UV_TTY)
-#define BUF_SIZE 0xfff
-
-static void walk_cb(uv_handle_t *handle, void *arg) {
+static void walk_cb(uv_handle_t *handle, void *arg)
+{
   if (!uv_is_closing(handle)) {
     uv_close(handle, NULL);
   }
 }
 
-#ifndef WIN32
 static void sig_handler(int signum)
 {
-  switch(signum) {
+  switch (signum) {
   case SIGWINCH: {
     int width, height;
     uv_tty_get_winsize(&tty, &width, &height);
@@ -54,15 +57,15 @@ static void sig_handler(int signum)
     return;
   }
 }
-#endif
 
-// static void sigwinch_cb(uv_signal_t *handle, int signum)
-// {
-//   int width, height;
-//   uv_tty_t *tty = handle->data;
-//   uv_tty_get_winsize(tty, &width, &height);
-//   fprintf(stderr, "rows: %d, cols: %d\n", height, width);
-// }
+#ifdef WIN32
+static void sigwinch_cb(uv_signal_t *handle, int signum)
+{
+  int width, height;
+  uv_tty_get_winsize(&tty_out, &width, &height);
+  fprintf(stderr, "rows: %d, cols: %d\n", height, width);
+}
+#endif
 
 static void alloc_cb(uv_handle_t *handle, size_t suggested, uv_buf_t *buf)
 {
@@ -80,7 +83,7 @@ static void read_cb(uv_stream_t *stream, ssize_t cnt, const uv_buf_t *buf)
   int *interrupted = stream->data;
 
   for (int i = 0; i < cnt; i++) {
-    if (buf->base[i] == 3) {
+    if (buf->base[i] == CTRL_C) {
       (*interrupted)++;
     }
   }
@@ -88,11 +91,13 @@ static void read_cb(uv_stream_t *stream, ssize_t cnt, const uv_buf_t *buf)
   uv_loop_t write_loop;
   uv_loop_init(&write_loop);
   uv_tty_t out;
-  uv_tty_init(&write_loop, &out, 1, 0);
+  uv_tty_init(&write_loop, &out, fileno(stdout), 0);
+
   uv_write_t req;
   uv_buf_t b = {.base = buf->base, .len = (size_t)cnt};
   uv_write(&req, STRUCT_CAST(uv_stream_t, &out), &b, 1, NULL);
   uv_run(&write_loop, UV_RUN_DEFAULT);
+
   uv_close(STRUCT_CAST(uv_handle_t, &out), NULL);
   uv_run(&write_loop, UV_RUN_DEFAULT);
   if (uv_loop_close(&write_loop)) {
@@ -137,7 +142,7 @@ int main(int argc, char **argv)
 
   if (argc > 1) {
     int count = atoi(argv[1]);
-    for (int i = 0; i < count; ++i) {
+    for (int i = 0; i < count; i++) {
       printf("line%d\n", i);
     }
     fflush(stdout);
@@ -148,8 +153,14 @@ int main(int argc, char **argv)
   uv_prepare_t prepare;
   uv_prepare_init(uv_default_loop(), &prepare);
   uv_prepare_start(&prepare, prepare_cb);
-  // uv_tty_t tty;
+#ifndef WIN32
   uv_tty_init(uv_default_loop(), &tty, fileno(stderr), 1);
+#else
+  uv_tty_init(uv_default_loop(), &tty, fileno(stdin), 1);
+  uv_tty_init(uv_default_loop(), &tty_out, fileno(stdout), 0);
+  int width, height;
+  uv_tty_get_winsize(&tty_out, &width, &height);
+#endif
   uv_tty_set_mode(&tty, UV_TTY_MODE_RAW);
   tty.data = &interrupted;
   uv_read_start(STRUCT_CAST(uv_stream_t, &tty), alloc_cb, read_cb);
@@ -160,15 +171,17 @@ int main(int argc, char **argv)
   sa.sa_handler = sig_handler;
   sigaction(SIGHUP, &sa, NULL);
   sigaction(SIGWINCH, &sa, NULL);
-  // uv_signal_t sigwinch_watcher;
-  // uv_signal_init(uv_default_loop(), &sigwinch_watcher);
-  // sigwinch_watcher.data = &tty;
-  // uv_signal_start(&sigwinch_watcher, sigwinch_cb, SIGWINCH);
+#else
+  uv_signal_t sigwinch_watcher;
+  uv_signal_init(uv_default_loop(), &sigwinch_watcher);
+  uv_signal_start(&sigwinch_watcher, sigwinch_cb, SIGWINCH);
 #endif
   uv_run(uv_default_loop(), UV_RUN_DEFAULT);
 
+#ifndef WIN32
   // XXX: Without this the SIGHUP handler is skipped on some systems.
   sleep(100);
+#endif
 
   return 0;
 }
diff --git a/test/functional/terminal/buffer_spec.lua b/test/functional/terminal/buffer_spec.lua
index 48b8512bf0..4ce33fef7b 100644
--- a/test/functional/terminal/buffer_spec.lua
+++ b/test/functional/terminal/buffer_spec.lua
@@ -6,8 +6,6 @@ local eval, feed_command, source = helpers.eval, helpers.feed_command, helpers.s
 local eq, neq = helpers.eq, helpers.neq
 local write_file = helpers.write_file
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal buffer', function()
   local screen
 
@@ -160,6 +158,7 @@ describe('terminal buffer', function()
   end)
 
   it('handles loss of focus gracefully', function()
+    if helpers.pending_win32(pending) then return end
     -- Change the statusline to avoid printing the file name, which varies.
     nvim('set_option', 'statusline', '==========')
     feed_command('set laststatus=0')
@@ -205,7 +204,6 @@ describe('terminal buffer', function()
 end)
 
 describe('No heap-buffer-overflow when using', function()
-
   local testfilename = 'Xtestfile-functional-terminal-buffers_spec'
 
   before_each(function()
diff --git a/test/functional/terminal/cursor_spec.lua b/test/functional/terminal/cursor_spec.lua
index 84d0322f12..d49f1bfc23 100644
--- a/test/functional/terminal/cursor_spec.lua
+++ b/test/functional/terminal/cursor_spec.lua
@@ -7,8 +7,6 @@ local feed_command = helpers.feed_command
 local hide_cursor = thelpers.hide_cursor
 local show_cursor = thelpers.show_cursor
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal cursor', function()
   local screen
 
diff --git a/test/functional/terminal/ex_terminal_spec.lua b/test/functional/terminal/ex_terminal_spec.lua
index be0fd9f8ff..9930efc402 100644
--- a/test/functional/terminal/ex_terminal_spec.lua
+++ b/test/functional/terminal/ex_terminal_spec.lua
@@ -3,10 +3,10 @@ local Screen = require('test.functional.ui.screen')
 local clear, wait, nvim = helpers.clear, helpers.wait, helpers.nvim
 local nvim_dir, source, eq = helpers.nvim_dir, helpers.source, helpers.eq
 local feed_command, eval = helpers.feed_command, helpers.eval
-
-if helpers.pending_win32(pending) then return end
+local iswin = helpers.iswin
 
 describe(':terminal', function()
+  if helpers.pending_win32(pending) then return end
   local screen
 
   before_each(function()
@@ -174,12 +174,15 @@ describe(':terminal (with fake shell)', function()
     eq('term://', string.match(eval('bufname("%")'), "^term://"))
     helpers.feed([[<C-\><C-N>]])
     feed_command([[find */shadacat.py]])
-    eq('scripts/shadacat.py', eval('bufname("%")'))
+    if iswin() then
+      eq('scripts\\shadacat.py', eval('bufname("%")'))
+    else
+      eq('scripts/shadacat.py', eval('bufname("%")'))
+    end
   end)
 
   it('works with gf', function()
     terminal_with_fake_shell([[echo "scripts/shadacat.py"]])
-    wait()
     screen:expect([[
       ready $ echo "scripts/shadacat.py"                |
                                                         |
diff --git a/test/functional/terminal/helpers.lua b/test/functional/terminal/helpers.lua
index 3b04d17705..bd24b9785d 100644
--- a/test/functional/terminal/helpers.lua
+++ b/test/functional/terminal/helpers.lua
@@ -33,7 +33,6 @@ local function disable_mouse() feed_termcode('[?1002l') end
 
 local default_command = '["'..nvim_dir..'/tty-test'..'"]'
 
-
 local function screen_setup(extra_rows, command, cols)
   extra_rows = extra_rows and extra_rows or 0
   command = command and command or default_command
diff --git a/test/functional/terminal/highlight_spec.lua b/test/functional/terminal/highlight_spec.lua
index bb40770235..fddc0bbb71 100644
--- a/test/functional/terminal/highlight_spec.lua
+++ b/test/functional/terminal/highlight_spec.lua
@@ -5,8 +5,6 @@ local feed, clear, nvim = helpers.feed, helpers.clear, helpers.nvim
 local nvim_dir, command = helpers.nvim_dir, helpers.command
 local eq, eval = helpers.eq, helpers.eval
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal window highlighting', function()
   local screen
 
@@ -55,6 +53,7 @@ describe('terminal window highlighting', function()
       end)
 
       local function pass_attrs()
+        if helpers.pending_win32(pending) then return end
         screen:expect(sub([[
           tty ready                                         |
           {NUM:text}text{10: }                                         |
@@ -69,6 +68,7 @@ describe('terminal window highlighting', function()
       it('will pass the corresponding attributes', pass_attrs)
 
       it('will pass the corresponding attributes on scrollback', function()
+        if helpers.pending_win32(pending) then return end
         pass_attrs()
         local lines = {}
         for i = 1, 8 do
@@ -145,6 +145,7 @@ describe('terminal window highlighting with custom palette', function()
   end)
 
   it('will use the custom color', function()
+    if helpers.pending_win32(pending) then return end
     thelpers.set_fg(3)
     thelpers.feed_data('text')
     thelpers.clear_attrs()
diff --git a/test/functional/terminal/mouse_spec.lua b/test/functional/terminal/mouse_spec.lua
index 9239c2ad31..29c62d7be7 100644
--- a/test/functional/terminal/mouse_spec.lua
+++ b/test/functional/terminal/mouse_spec.lua
@@ -4,8 +4,6 @@ local clear, eq, eval = helpers.clear, helpers.eq, helpers.eval
 local feed, nvim = helpers.feed, helpers.nvim
 local feed_data = thelpers.feed_data
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal mouse', function()
   local screen
 
@@ -67,6 +65,7 @@ describe('terminal mouse', function()
       end)
 
       it('will forward mouse clicks to the program', function()
+        if helpers.pending_win32(pending) then return end
         feed('<LeftMouse><1,2>')
         screen:expect([[
           line27                                            |
@@ -80,6 +79,7 @@ describe('terminal mouse', function()
       end)
 
       it('will forward mouse scroll to the program', function()
+        if helpers.pending_win32(pending) then return end
         feed('<ScrollWheelUp><0,0>')
         screen:expect([[
           line27                                            |
@@ -94,6 +94,7 @@ describe('terminal mouse', function()
     end)
 
     describe('with a split window and other buffer', function()
+      if helpers.pending_win32(pending) then return end
       before_each(function()
         feed('<c-\\><c-n>:vsp<cr>')
         screen:expect([[
diff --git a/test/functional/terminal/scrollback_spec.lua b/test/functional/terminal/scrollback_spec.lua
index 05f81295c2..af9b414311 100644
--- a/test/functional/terminal/scrollback_spec.lua
+++ b/test/functional/terminal/scrollback_spec.lua
@@ -3,6 +3,7 @@ local helpers = require('test.functional.helpers')(after_each)
 local thelpers = require('test.functional.terminal.helpers')
 local clear, eq, curbuf = helpers.clear, helpers.eq, helpers.curbuf
 local feed, nvim_dir, feed_command = helpers.feed, helpers.nvim_dir, helpers.feed_command
+local iswin = helpers.iswin
 local eval = helpers.eval
 local command = helpers.command
 local wait = helpers.wait
@@ -11,8 +12,6 @@ local curbufmeths = helpers.curbufmeths
 local nvim = helpers.nvim
 local feed_data = thelpers.feed_data
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal scrollback', function()
   local screen
 
@@ -58,7 +57,7 @@ describe('terminal scrollback', function()
     end)
   end)
 
-  describe('with the cursor at the last row', function()
+  describe('with cursor at last row', function()
     before_each(function()
       feed_data({'line1', 'line2', 'line3', 'line4', ''})
       screen:expect([[
@@ -139,16 +138,18 @@ describe('terminal scrollback', function()
     end)
 
 
-    describe('and the height is decreased by 1', function()
+    describe('and height decreased by 1', function()
+      if helpers.pending_win32(pending) then return end
       local function will_hide_top_line()
-        screen:try_resize(screen._width, screen._height - 1)
+        feed([[<C-\><C-N>:]])  -- Go to cmdline-mode, so cursor is at bottom.
+        screen:try_resize(screen._width - 2, screen._height - 1)
         screen:expect([[
-          line2                         |
-          line3                         |
-          line4                         |
-          rows: 5, cols: 30             |
-          {1: }                             |
-          {3:-- TERMINAL --}                |
+          line2                       |
+          line3                       |
+          line4                       |
+          rows: 5, cols: 28           |
+          {2: }                           |
+          :^                           |
         ]])
       end
 
@@ -157,23 +158,23 @@ describe('terminal scrollback', function()
       describe('and then decreased by 2', function()
         before_each(function()
           will_hide_top_line()
-          screen:try_resize(screen._width, screen._height - 2)
+          screen:try_resize(screen._width - 2, screen._height - 2)
         end)
 
         it('will hide the top 3 lines', function()
           screen:expect([[
-            rows: 5, cols: 30             |
-            rows: 3, cols: 30             |
-            {1: }                             |
-            {3:-- TERMINAL --}                |
+            rows: 5, cols: 28         |
+            rows: 3, cols: 26         |
+            {2: }                         |
+            :^                         |
           ]])
           eq(8, curbuf('line_count'))
-          feed('<c-\\><c-n>3k')
+          feed([[<C-\><C-N>3k]])
           screen:expect([[
-            ^line4                         |
-            rows: 5, cols: 30             |
-            rows: 3, cols: 30             |
-                                          |
+            ^line4                     |
+            rows: 5, cols: 28         |
+            rows: 3, cols: 26         |
+                                      |
           ]])
         end)
       end)
@@ -181,6 +182,11 @@ describe('terminal scrollback', function()
   end)
 
   describe('with empty lines after the cursor', function()
+    -- XXX: Can't test this reliably on Windows unless the cursor is _moved_
+    --      by the resize. http://docs.libuv.org/en/v1.x/signal.html
+    --      See also: https://github.com/rprichard/winpty/issues/110
+    if helpers.pending_win32(pending) then return end
+
     describe('and the height is decreased by 2', function()
       before_each(function()
         screen:try_resize(screen._width, screen._height - 2)
@@ -255,6 +261,10 @@ describe('terminal scrollback', function()
     end)
 
     describe('and the height is increased by 1', function()
+      -- XXX: Can't test this reliably on Windows unless the cursor is _moved_
+      --      by the resize. http://docs.libuv.org/en/v1.x/signal.html
+      --      See also: https://github.com/rprichard/winpty/issues/110
+      if helpers.pending_win32(pending) then return end
       local function pop_then_push()
         screen:try_resize(screen._width, screen._height + 1)
         screen:expect([[
@@ -384,10 +394,20 @@ describe("'scrollback' option", function()
   end
 
   it('set to 0 behaves as 1', function()
-    local screen = thelpers.screen_setup(nil, "['sh']", 30)
+    local screen
+    if iswin() then
+      screen = thelpers.screen_setup(nil,
+      "['powershell.exe', '-NoLogo', '-NoProfile', '-NoExit', '-Command', 'function global:prompt {return "..'"$"'.."}']", 30)
+    else
+      screen = thelpers.screen_setup(nil, "['sh']", 30)
+    end
 
     curbufmeths.set_option('scrollback', 0)
-    feed_data('for i in $(seq 1 30); do echo "line$i"; done\n')
+    if iswin() then
+      feed_data('for($i=1;$i -le 30;$i++){Write-Host \"line$i\"}\r')
+    else
+      feed_data('for i in $(seq 1 30); do echo "line$i"; done\n')
+    end
     screen:expect('line30                        ', nil, nil, nil, true)
     retry(nil, nil, function() expect_lines(7) end)
 
@@ -395,7 +415,13 @@ describe("'scrollback' option", function()
   end)
 
   it('deletes lines (only) if necessary', function()
-    local screen = thelpers.screen_setup(nil, "['sh']", 30)
+    local screen
+    if iswin() then
+      screen = thelpers.screen_setup(nil,
+      "['powershell.exe', '-NoLogo', '-NoProfile', '-NoExit', '-Command', 'function global:prompt {return "..'"$"'.."}']", 30)
+    else
+      screen = thelpers.screen_setup(nil, "['sh']", 30)
+    end
 
     curbufmeths.set_option('scrollback', 200)
 
@@ -403,7 +429,11 @@ describe("'scrollback' option", function()
     screen:expect('$', nil, nil, nil, true)
 
     wait()
-    feed_data('for i in $(seq 1 30); do echo "line$i"; done\n')
+    if iswin() then
+      feed_data('for($i=1;$i -le 30;$i++){Write-Host \"line$i\"}\r')
+    else
+      feed_data('for i in $(seq 1 30); do echo "line$i"; done\n')
+    end
 
     screen:expect('line30                        ', nil, nil, nil, true)
 
@@ -416,7 +446,11 @@ describe("'scrollback' option", function()
     -- Terminal job data is received asynchronously, may happen before the
     -- 'scrollback' option is synchronized with the internal sb_buffer.
     command('sleep 100m')
-    feed_data('for i in $(seq 1 40); do echo "line$i"; done\n')
+    if iswin() then
+      feed_data('for($i=1;$i -le 40;$i++){Write-Host \"line$i\"}\r')
+    else
+      feed_data('for i in $(seq 1 40); do echo "line$i"; done\n')
+    end
 
     screen:expect('line40                        ', nil, nil, nil, true)
 
diff --git a/test/functional/terminal/window_spec.lua b/test/functional/terminal/window_spec.lua
index 888b1e1328..0f705cfe40 100644
--- a/test/functional/terminal/window_spec.lua
+++ b/test/functional/terminal/window_spec.lua
@@ -3,8 +3,6 @@ local thelpers = require('test.functional.terminal.helpers')
 local feed, clear = helpers.feed, helpers.clear
 local wait = helpers.wait
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal window', function()
   local screen
 
diff --git a/test/functional/terminal/window_split_tab_spec.lua b/test/functional/terminal/window_split_tab_spec.lua
index 4867e0d9fa..c5199f620e 100644
--- a/test/functional/terminal/window_split_tab_spec.lua
+++ b/test/functional/terminal/window_split_tab_spec.lua
@@ -4,8 +4,6 @@ local clear = helpers.clear
 local feed, nvim = helpers.feed, helpers.nvim
 local feed_command = helpers.feed_command
 
-if helpers.pending_win32(pending) then return end
-
 describe('terminal', function()
   local screen
 
@@ -25,6 +23,7 @@ describe('terminal', function()
   end)
 
   it('resets its size when entering terminal window', function()
+    if helpers.pending_win32(pending) then return end
     feed('<c-\\><c-n>')
     feed_command('2split')
     screen:expect([[
@@ -69,31 +68,25 @@ describe('terminal', function()
 
   describe('when the screen is resized', function()
     it('will forward a resize request to the program', function()
-      screen:try_resize(screen._width + 3, screen._height + 5)
+      feed([[<C-\><C-N>:]])  -- Go to cmdline-mode, so cursor is at bottom.
+      screen:try_resize(screen._width - 3, screen._height - 2)
       screen:expect([[
-        tty ready                                            |
-        rows: 14, cols: 53                                   |
-        {1: }                                                    |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-                                                             |
-        {3:-- TERMINAL --}                                       |
+        tty ready                                      |
+        rows: 7, cols: 47                              |
+        {2: }                                              |
+                                                       |
+                                                       |
+                                                       |
+                                                       |
+        :^                                              |
       ]])
-      screen:try_resize(screen._width - 6, screen._height - 10)
+      screen:try_resize(screen._width - 6, screen._height - 3)
       screen:expect([[
-        tty ready                                      |
-        rows: 14, cols: 53                             |
-        rows: 4, cols: 47                              |
-        {1: }                                              |
-        {3:-- TERMINAL --}                                 |
+        tty ready                                |
+        rows: 7, cols: 47                        |
+        rows: 4, cols: 41                        |
+        {2: }                                        |
+        :^                                        |
       ]])
     end)
   end)