Add rime-commit-and-toggle-input-method function. (DogLooksGood#212)

* Add `rime-commit-and-toggle-input-method` function.

* Fix not usable when didn't do toggle-input-method yet for the first
time during every Emacs startup.

README.org

@@ -227,6 +227,10 @@
 
 默认行为为自动关闭，设置 ~rime-deactivate-when-exit-minibuffer~ 为 nil 取消该行为。
 
+* 在切换输入法时自动上屏
+
+可将 ~rime-commit-and-toggle-input-method~ 绑定到某个按键上来替代原本 ~toggle-input-method~ 的功能。
+
 * 指定 Rime 共享目录和用户目录
 
 ~rime-share-data-dir~ 是 Rime 安装后放置配置的目录，例如 Linux 上默认为 /usr/share/rime-data. 通常使用默认值即可。

README_EN.org

@@ -160,6 +160,10 @@ Default to ~|~ , you can customize it with
   (setq rime-cursor "˰")
 #+END_SRC
 
+* Commit the first item automatically when toggle input method
+
+Give =rime-commit-and-toggle-input-method= a keybinding to replace what =toggle-input-method= does.
+
 * Shortcut to open Rime configuration file
 
 Use ~rime-open-configuration~.

rime.el

@@ -1166,6 +1166,15 @@ Will resume when finish composition."
         tab-line-format  nil)
   (jit-lock-mode -1))
 
+(defun rime-commit-and-toggle-input-method ()
+  "Commit the first item if exists, then toggle input method."
+  (interactive)
+  (ignore-errors
+    (when (rime-lib-process-key 32 0)
+      (let ((commit (rime-lib-get-commit)))
+        (insert commit)
+        (rime--clear-state))))
+  (toggle-input-method))
 
 (require 'rime-predicates)