The script could change the IME of the foreground window for Windows. It is proposed to work with atom-vim-mode-plus-auto-ime. Tested in Windows 10 (15063) and Python 3.6.

For linux, fcitx-remote provides the similar function.

For OS X, you may want to look at input-source-switcher, and I stole its README. Thanks Vovkasm!

python ime_helper.py (--current | --locale LOCALE | --hex HEX | --dec DEC)

Or you could use the pre-built EXEs.

Arguments:

--current        get current LCID

--locale LOCALE  locale name, like zh_CN

--hex HEX        LCID in hex, like 0x804

--dec DEC        LCID in dec, like 2052

For more Microsoft Locale ID (LCID) Values, see https://msdn.microsoft.com/en-us/library/ms912047(WinEmbedded.10).aspx

Doesn't work on CMD or powershell, however, if you set a delay time you will see it works on other softwares:

# powershell
sleep 5|python ime_helper.py --locale zh_CN
# then switch to another window

I'm new to Windows APIs. Any help would be appreciated.