From 5c7b8e5833efb64360e3fcc60b2366fb7f726c35 Mon Sep 17 00:00:00 2001
From: oxalica <oxalicc@pm.me>
Date: Fri, 20 Aug 2021 16:31:07 +0800
Subject: [PATCH] Also support fcitx5-remote to toggle IME state (#27)

* Also support fcitx5-remote to toggle IME state

* Fix types and wording
---
 README.md        | 28 +++++++++++++++++++--
 plugin/fcitx.vim | 65 ++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 78 insertions(+), 15 deletions(-)

diff --git a/README.md b/README.md
index 3101743..1c2ae92 100644
--- a/README.md
+++ b/README.md
@@ -2,12 +2,24 @@ Keep and restore fcitx state for each buffer separately when leaving/re-entering
 
 D-Bus only works with the same user so this won't work with `sudo vim`. See the `fcitx5-server` branch for an experimental implementation that supports `sudo vim`.
 
-Requires:
+By default, it use python3 and D-Bus to toggle IME state.
+If you set `g:fcitx5_remote` to the executable path of `fcitx5-remote` **BEFORE** loading the plugin, it will use `fcitx5-remote` instead of python and D-Bus. In this case, python3 support is optional.
+
+Usually `fcitx5-remote` mode is way faster since Python script need quite some time for the initial load if you don't use any other plugins that load Python.
+
+Base requirements:
 
 * fcitx 5
+
+Requirements for Python mode (`g:fcitx5_remote` is not set):
+
 * Vim with Python 3 compiled in
 * The python-dbus package
 
+Requirements for `fcitx5-remote` mode (`g:fcitx5_remote` is set):
+
+* fcitx5-remote
+
 Links:
 
 * [git repo](https://github.com/lilydjwg/fcitx.vim)
@@ -21,12 +33,24 @@ Warning:
 
 D-Bus 只在同一用户时有效，所以使用 `sudo vim` 时本代码就失效了。在 `fcitx5-server` 分支有一个实验性的版本支持 `sudo vim` 的用法。
 
-要求:
+本插件默认会使用 Python 3 并通过 D-Bus 来切换输入法状态。
+但如果你在加载插件**之前**设置了 `g:fcitx5_remote` 为你已安装的 `fcitx5-remote` 可执行文件的路径，那么本插件会使用它来切换输入法状态；此模式下本插件并不需要 Python 。
+
+如果你没有其他使用 Python 的 Vim 插件，本插件的 Python 模式初始化可能会显著拖慢启动时间；而 `fcitx5-remote` 模式则没有这个问题。
+
+基本要求：
 
 * fcitx 5
+
+使用 Python 模式的要求（未设置 `g:fcitx5_remote`）：
+
 * 带有 Python 3 支持的 Vim
 * python-dbus 包
 
+使用 `fcitx5-remote` 模式的要求（需设置 `g:fcitx5_remote`）：
+
+* fcitx5-remote
+
 链接：
 
 * [git 仓库](https://github.com/lilydjwg/fcitx.vim)
diff --git a/plugin/fcitx.vim b/plugin/fcitx.vim
index d1eab03..9b4d47c 100644
--- a/plugin/fcitx.vim
+++ b/plugin/fcitx.vim
@@ -5,27 +5,66 @@ scriptencoding utf-8
 " URL:		https://www.vim.org/scripts/script.php?script_id=3764
 " ---------------------------------------------------------------------
 " Load Once:
-if &cp || exists("g:loaded_fcitx") || !exists('$DISPLAY') || !has('python3')
+if &cp || exists("g:loaded_fcitx") || !exists('$DISPLAY')
   finish
 endif
 let s:keepcpo = &cpo
 set cpo&vim
-let g:loaded_fcitx = 1
 
-try " abort on fail
-  exe 'py3file' expand('<sfile>:r') . '.py'
-  if py3eval('fcitx_loaded')
-    if exists('##InsertLeavePre')
-      au InsertLeavePre * py3 fcitx2en()
-    else
-      au InsertLeave * py3 fcitx2en()
+" If g:fcitx5_remote is set (to the path to `fcitx5-remove`), use it to toggle IME state.
+if exists("g:fcitx5_remote")
+  function Fcitx2en()
+    let inputstatus = trim(system(g:fcitx5_remote))
+    if inputstatus == '2'
+      let b:inputtoggle = 1
+      call system(g:fcitx5_remote . ' -c')
     endif
-    au InsertEnter * py3 fcitx2zh()
-    au CmdlineEnter [/\?] py3 fcitx2zh()
-    au CmdlineLeave [/\?] py3 fcitx2en()
+  endfunction
+  function Fcitx2zh()
+    try
+      if b:inputtoggle == 1
+        call system(g:fcitx5_remote . ' -o')
+        let b:inputtoggle = 0
+      endif
+    catch /inputtoggle/
+      let b:inputtoggle = 0
+    endtry
+  endfunction
+
+  let g:loaded_fcitx = 1
+
+" Otherwise, if python3 is available, use python and dbus to toggle IME state.
+elseif has('python3')
+  try " abort on fail
+    exe 'py3file' expand('<sfile>:r') . '.py'
+    if py3eval('fcitx_loaded')
+      function Fcitx2en()
+        py3 fcitx2en()
+      endfunction
+      function Fcitx2zh()
+        py3 fcitx2zh()
+      endfunction
+
+      let g:loaded_fcitx = 1
+    endif
+  endtry
+endif
+
+" Register autocmd if successfully loaded.
+if exists("g:loaded_fcitx")
+  if exists('##InsertLeavePre')
+    au InsertLeavePre * call Fcitx2en()
+  else
+    au InsertLeave * call Fcitx2en()
   endif
-endtry
+  au InsertEnter * call Fcitx2zh()
+  au CmdlineEnter [/\?] call Fcitx2zh()
+  au CmdlineLeave [/\?] call Fcitx2en()
+endif
+
 " ---------------------------------------------------------------------
 "  Restoration And Modelines:
 let &cpo=s:keepcpo
 unlet s:keepcpo
+
+" vim: sw=2 :