HammerSpoonSwitchIME.lua

local obj = {}
obj.__index = obj

-- Metadata
obj.name = "HammerspoonSwitchIME"
obj.version = "0.1"
obj.author = "Qiangning Hong"
obj.license = "MIT"

local ENGLISH_ID = "com.apple.keylayout.US"
local CHINESE_ID = "im.rime.inputmethod.Squirrel.Hans"
local JAPANESE_ID = "com.apple.inputmethod.Kotoeri.RomajiTyping.Japanese"


local function switch(id)
    hs.keycodes.currentSourceID(id)
end

function obj:bindHotkeys()
    hs.hotkey.bind({"cmd", "alt"}, "e", function() switch(ENGLISH_ID) end)
    hs.hotkey.bind({"cmd", "alt"}, "c", function() switch(CHINESE_ID) end)
    hs.hotkey.bind({"cmd", "alt"}, "j", function() switch(JAPANESE_ID) end)
end

return obj