refactor(terminal)!: drop winpty, require Windows 10 #18253

Problem:
winpty is only needed for Windows 8.1. Removing it reduces our build and code
complexity.

Solution:
- Remove winpty.
- Require Windows 10.

closes #18252

8 files changed, 22 insertions, 187 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8b2110a00f..82d9a42db2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -509,11 +509,6 @@ endif()
 find_package(LIBVTERM 0.1 REQUIRED)
 include_directories(SYSTEM ${LIBVTERM_INCLUDE_DIRS})
 
-if(WIN32)
-  find_package(Winpty 0.4.3 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
deleted file mode 100644
index 8feafc58a8..0000000000
--- a/cmake/FindWinpty.cmake
+++ /dev/null
@@ -1,10 +0,0 @@
-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/runtime/doc/api.txt b/runtime/doc/api.txt
index f4942d7f26..8e33e7a67b 100644
--- a/runtime/doc/api.txt
+++ b/runtime/doc/api.txt
@@ -929,7 +929,7 @@ nvim_get_chan_info({chan})                              *nvim_get_chan_info()*
                     • "pty" (optional) Name of pseudoterminal. On a POSIX
                       system this is a device path like "/dev/pts/1". If the
                       name is unknown, the key will still be present if a pty
-                      is used (e.g. for winpty on Windows).
+                      is used (e.g. for conpty on Windows).
                     • "buffer" (optional) Buffer with connected |terminal|
                       instance.
                     • "client" (optional) Info about the peer (client on the
diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index e65119ea1b..9f5cf70134 100755
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -465,7 +465,6 @@ endif()
 
 if(WIN32)
   list(APPEND NVIM_LINK_LIBRARIES netapi32)
-  list(APPEND NVIM_LINK_LIBRARIES ${WINPTY_LIBRARIES})
 endif()
 
 # Use "luv" as imported library, to work around CMake using "-lluv" for
@@ -552,8 +551,6 @@ if(WIN32)
                       diff.exe
                       tee.exe
                       win32yank.exe
-                      winpty-agent.exe
-                      winpty.dll
                       xxd.exe
 
                       # Dependencies for neovim-qt
diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index 7a966777af..0f9a4a0e0d 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -1740,7 +1740,7 @@ void nvim_set_client_info(uint64_t channel_id, String name, Dictionary version,
 ///    -  "pty"     (optional) Name of pseudoterminal. On a POSIX system this
 ///                 is a device path like "/dev/pts/1". If the name is unknown,
 ///                 the key will still be present if a pty is used (e.g. for
-///                 winpty on Windows).
+///                 conpty on Windows).
 ///    -  "buffer"  (optional) Buffer with connected |terminal| instance.
 ///    -  "client"  (optional) Info about the peer (client on the other end of
 ///                 the RPC channel), if provided by it via
diff --git a/src/nvim/os/pty_process_win.c b/src/nvim/os/pty_process_win.c
index 4fb9e30a96..5bbd22c610 100644
--- a/src/nvim/os/pty_process_win.c
+++ b/src/nvim/os/pty_process_win.c
@@ -4,7 +4,6 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <stdlib.h>
-#include <winpty_constants.h>
 
 #include "nvim/ascii.h"
 #include "nvim/mbyte.h"  // for utf8_to_utf16, utf16_to_utf8
@@ -23,11 +22,7 @@ static void CALLBACK pty_process_finish1(void *context, BOOLEAN unused)
   PtyProcess *ptyproc = (PtyProcess *)context;
   Process *proc = (Process *)ptyproc;
 
-  if (ptyproc->type == kConpty
-      && ptyproc->object.conpty != NULL) {
-    os_conpty_free(ptyproc->object.conpty);
-    ptyproc->object.conpty = NULL;
-  }
+  os_conpty_free(ptyproc->conpty);
   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);
@@ -39,10 +34,6 @@ int pty_process_spawn(PtyProcess *ptyproc)
 {
   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;
   conpty_t *conpty_object = NULL;
   char *in_name = NULL;
   char *out_name = NULL;
@@ -56,38 +47,11 @@ int pty_process_spawn(PtyProcess *ptyproc)
 
   assert(proc->err.closed);
 
-  if (os_has_conpty_working()) {
-    if ((conpty_object =
-         os_conpty_init(&in_name, &out_name, ptyproc->width, ptyproc->height)) != NULL) {
-      ptyproc->type = kConpty;
-    }
-  }
-
-  if (ptyproc->type == kWinpty) {
-    cfg = winpty_config_new(WINPTY_FLAG_ALLOW_CURPROC_DESKTOP_CREATION, &err);
-    if (cfg == NULL) {
-      emsg = "winpty_config_new failed";
-      goto cleanup;
-    }
-
-    winpty_config_set_initial_size(cfg, ptyproc->width, ptyproc->height);
-    winpty_object = winpty_open(cfg, &err);
-    if (winpty_object == NULL) {
-      emsg = "winpty_open failed";
-      goto cleanup;
-    }
-
-    status = utf16_to_utf8(winpty_conin_name(winpty_object), -1, &in_name);
-    if (status != 0) {
-      emsg = "utf16_to_utf8(winpty_conin_name) failed";
-      goto cleanup;
-    }
-
-    status = utf16_to_utf8(winpty_conout_name(winpty_object), -1, &out_name);
-    if (status != 0) {
-      emsg = "utf16_to_utf8(winpty_conout_name) failed";
-      goto cleanup;
-    }
+  if (!os_has_conpty_working()
+      || (conpty_object =
+          os_conpty_init(&in_name, &out_name, ptyproc->width, ptyproc->height)) == NULL) {
+    status = UV_ENOSYS;
+    goto cleanup;
   }
 
   if (!proc->in.closed) {
@@ -130,44 +94,15 @@ int pty_process_spawn(PtyProcess *ptyproc)
     goto cleanup;
   }
 
-  if (ptyproc->type == kConpty) {
-    if (!os_conpty_spawn(conpty_object,
-                         &process_handle,
-                         NULL,
-                         cmd_line,
-                         cwd,
-                         env)) {
-      emsg = "os_conpty_spawn failed";
-      status = (int)GetLastError();
-      goto cleanup;
-    }
-  } else {
-    spawncfg = winpty_spawn_config_new(WINPTY_SPAWN_FLAG_AUTO_SHUTDOWN,
-                                       NULL,  // Optional application name
-                                       cmd_line,
-                                       cwd,
-                                       env,
-                                       &err);
-    if (spawncfg == NULL) {
-      emsg = "winpty_spawn_config_new failed";
-      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 to spawn process";
-      } else {
-        emsg = "winpty_spawn failed";
-      }
-      goto cleanup;
-    }
+  if (!os_conpty_spawn(conpty_object,
+                       &process_handle,
+                       NULL,
+                       cmd_line,
+                       cwd,
+                       env)) {
+    emsg = "os_conpty_spawn failed";
+    status = (int)GetLastError();
+    goto cleanup;
   }
   proc->pid = (int)GetProcessId(process_handle);
 
@@ -186,11 +121,8 @@ int pty_process_spawn(PtyProcess *ptyproc)
     uv_run(&proc->loop->uv, UV_RUN_ONCE);
   }
 
-  (ptyproc->type == kConpty) ?
-  (void *)(ptyproc->object.conpty = conpty_object) :
-  (void *)(ptyproc->object.winpty = winpty_object);
+  ptyproc->conpty = conpty_object;
   ptyproc->process_handle = process_handle;
-  winpty_object = NULL;
   conpty_object = NULL;
   process_handle = NULL;
 
@@ -200,16 +132,7 @@ cleanup:
     ELOG("pty_process_spawn(%s): %s: error code: %d",
          proc->argv[0], emsg, status);
     status = os_translate_sys_error(status);
-  } else if (err != NULL) {
-    status = (int)winpty_error_code(err);
-    ELOG("pty_process_spawn(%s): %s: error code: %d",
-         proc->argv[0], emsg, status);
-    status = translate_winpty_error(status);
   }
-  winpty_error_free(err);
-  winpty_config_free(cfg);
-  winpty_spawn_config_free(spawncfg);
-  winpty_free(winpty_object);
   os_conpty_free(conpty_object);
   xfree(in_name);
   xfree(out_name);
@@ -232,12 +155,7 @@ const char *pty_process_tty_name(PtyProcess *ptyproc)
 void pty_process_resize(PtyProcess *ptyproc, uint16_t width, uint16_t height)
   FUNC_ATTR_NONNULL_ALL
 {
-  if (ptyproc->type == kConpty
-      && ptyproc->object.conpty != NULL) {
-    os_conpty_set_size(ptyproc->object.conpty, width, height);
-  } else if (ptyproc->object.winpty != NULL) {
-    winpty_set_size(ptyproc->object.winpty, width, height, NULL);
-  }
+  os_conpty_set_size(ptyproc->conpty, width, height);
 }
 
 void pty_process_close(PtyProcess *ptyproc)
@@ -255,11 +173,6 @@ void pty_process_close(PtyProcess *ptyproc)
 void pty_process_close_master(PtyProcess *ptyproc)
   FUNC_ATTR_NONNULL_ALL
 {
-  if (ptyproc->type == kWinpty
-      && ptyproc->object.winpty != NULL) {
-    winpty_free(ptyproc->object.winpty);
-    ptyproc->object.winpty = NULL;
-  }
 }
 
 void pty_process_teardown(Loop *loop)
@@ -434,40 +347,6 @@ static void quote_cmd_arg(char *dest, size_t dest_remaining, const char *src)
   }
 }
 
-/// 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;
-  }
-}
-
 typedef struct EnvNode {
   wchar_t *str;
   size_t len;
@@ -484,7 +363,7 @@ static int build_env_block(dict_T *denv, wchar_t **env_block)
 {
   const size_t denv_size = (size_t)tv_dict_len(denv);
   size_t env_block_len = 0;
-  int rc;
+  int rc = 0;
   char **env = tv_dict_to_env(denv);
 
   QUEUE *q;
diff --git a/src/nvim/os/pty_process_win.h b/src/nvim/os/pty_process_win.h
index d1737fd63a..ed7d765ac7 100644
--- a/src/nvim/os/pty_process_win.h
+++ b/src/nvim/os/pty_process_win.h
@@ -2,25 +2,15 @@
 #define NVIM_OS_PTY_PROCESS_WIN_H
 
 #include <uv.h>
-#include <winpty.h>
 
 #include "nvim/event/process.h"
 #include "nvim/lib/queue.h"
 #include "nvim/os/pty_conpty_win.h"
 
-typedef enum {
-  kWinpty,
-  kConpty,
-} PtyType;
-
 typedef struct pty_process {
   Process process;
   uint16_t width, height;
-  union {
-    winpty_t *winpty;
-    conpty_t *conpty;
-  } object;
-  PtyType type;
+  conpty_t *conpty;
   HANDLE finish_wait;
   HANDLE process_handle;
   uv_timer_t wait_eof_timer;
@@ -38,8 +28,7 @@ static inline PtyProcess pty_process_init(Loop *loop, void *data)
   rv.process = process_init(loop, kProcessTypePty, data);
   rv.width = 80;
   rv.height = 24;
-  rv.object.winpty = NULL;
-  rv.type = kWinpty;
+  rv.conpty = NULL;
   rv.finish_wait = NULL;
   rv.process_handle = NULL;
   return rv;
diff --git a/third-party/CMakeLists.txt b/third-party/CMakeLists.txt
index c06e31a328..6b1c0b466e 100644
--- a/third-party/CMakeLists.txt
+++ b/third-party/CMakeLists.txt
@@ -191,9 +191,6 @@ set(WIN32YANK_X86_SHA256 62f34e5a46c5d4a7b3f3b512e1ff7b77fedd432f42581cbe825233a
 set(WIN32YANK_X86_64_URL https://github.com/equalsraf/win32yank/releases/download/v0.0.4/win32yank-x64.zip)
 set(WIN32YANK_X86_64_SHA256 33a747a92da60fb65e668edbf7661d3d902411a2d545fe9dc08623cecd142a20)
 
-set(WINPTY_URL https://github.com/rprichard/winpty/releases/download/0.4.3/winpty-0.4.3-msvc2015.zip)
-set(WINPTY_SHA256 35a48ece2ff4acdcbc8299d4920de53eb86b1fb41e64d2fe5ae7898931bcee89)
-
 set(GETTEXT_URL https://ftp.gnu.org/pub/gnu/gettext/gettext-0.20.1.tar.gz)
 set(GETTEXT_SHA256 66415634c6e8c3fa8b71362879ec7575e27da43da562c798a8a2f223e6e47f5c)
 
@@ -284,18 +281,6 @@ if(WIN32)
   elseif(TARGET_ARCH STREQUAL "X86")
     set(TARGET_ARCH ia32)
   endif()
-
-  GetBinaryDep(TARGET winpty
-    INSTALL_COMMAND ${CMAKE_COMMAND} -E make_directory ${DEPS_INSTALL_DIR}/bin
-      COMMAND ${CMAKE_COMMAND} -DFROM_GLOB=${DEPS_BUILD_DIR}/src/winpty/${TARGET_ARCH}/bin/*
-        -DTO=${DEPS_INSTALL_DIR}/bin/
-        -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/CopyFilesGlob.cmake
-      COMMAND ${CMAKE_COMMAND} -DFROM_GLOB=${DEPS_BUILD_DIR}/src/winpty/include/*
-        -DTO=${DEPS_INSTALL_DIR}/include/
-        -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/CopyFilesGlob.cmake
-      COMMAND ${CMAKE_COMMAND} -DFROM_GLOB=${DEPS_BUILD_DIR}/src/winpty/${TARGET_ARCH}/lib/*
-        -DTO=${DEPS_INSTALL_DIR}/lib/
-        -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/CopyFilesGlob.cmake)
 endif()
 
 # clean-shared-libraries removes ${DEPS_INSTALL_DIR}/lib/nvim/parser/c.dll,