Saved from http://gitlab.alipay-inc.com/snippets/751?spm=a1z2e.12184483.snswall.125.2a8c4f9br3R37c

untitled

local function Chinese()
    hs.keycodes.currentSourceID("com.sogou.inputmethod.sogou.pinyin")
end

local function English()
    hs.keycodes.currentSourceID("com.apple.keylayout.ABC")
end

-- app to expected ime config
local app2Ime = {
    ['/Applications/DingTalk.app'] = 'Chinese',
    ['/Applications/NeteaseMusic.app'] = 'Chinese',
    ['/Applications/微信.app'] = 'Chinese',
    ['/Applications/MindNode.app'] = 'Chinese',
    ['/Applications/Preview.app'] = 'Chinese'
}

local function isempty(s)
  return s == nil or s == ''
end

function updateFocusAppInputMethod()
    local ime = 'English'
    if ((not isempty(hs.window.focusedWindow())) and (not isempty(hs.window.focusedWindow():application()))) then
        local focusAppPath = hs.window.focusedWindow():application():path()
        local expectedIme = app2Ime[focusAppPath]
        if expectedIme ~= nil then
            ime = expectedIme;
        end
    end 

    if ime == 'Chinese' then
        Chinese()
    else
        English()
    end
end

--[[
-- helper hotkey to figure out the app path and name of current focused window
hs.hotkey.bind({'ctrl', 'cmd'}, ".", function()
    hs.alert.show("App path:        "
    ..hs.window.focusedWindow():application():path()
    .."\n"
    .."App name:      "
    ..hs.window.focusedWindow():application():name()
    .."\n"
    .."IM source id:  "
    ..hs.keycodes.currentSourceID())
end)
--]]

-- Handle cursor focus and application's screen manage.
function applicationWatcher(appName, eventType, appObject)
    if (eventType == hs.application.watcher.activated) then
        updateFocusAppInputMethod()
    end
end

appWatcher = hs.application.watcher.new(applicationWatcher)
appWatcher:start()