Karabiner language switcher (different shortcuts for different languages)

complex_modification_lang_switcher.json

{
  "title": "Language toggler",
  "rules": [
    {
      "description": "Left_Shift+Left_Command=Ru",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "left_shift",
            "modifiers": {
              "mandatory": ["left_command"]
            }
          },
          "to_if_alone": [
            {
              "select_input_source": {
                "language": "ru"
              }
            }
          ]
        }
      ]
    },
    {
      "description": "Left_Shift+Left_Ctrl=En",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "left_shift",
            "modifiers": {
              "mandatory": ["left_control"]
            }
          },
          "to_if_alone": [
            {
              "select_input_source": {
                "language": "en"
              }
            }
          ]
        }
      ]
    },
    {
      "description": "Left_Shift+Left_Opt=Uk",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "left_shift",
            "modifiers": {
              "mandatory": ["left_option"]
            }
          },
          "to_if_alone": [
            {
              "select_input_source": {
                "language": "uk"
              }
            }
          ]
        }
      ]
    }
  ]
}