Duo Modifiers

Duo-modifier is an idea combined with home row mods and duo-layer:

• Map one single key to mod(s) will be similar to either layer or simlayer, which would have the same problems.
• Duo-modifier uses 2 keys instead, similar to duo-layer.
• It also has the same problems as duo-layer.

info

Adjust basic.simultaneous_threshold_milliseconds to your typing speed and habit.

tip

When get started, it can be very useful to show a notification when the mod(s) are activated, see an example here.

Copy and edit the code below in the online editor:

function duoModifier(keys, modifier) {
  const [firstMod, ...restMods] =
    modifier in modifierKeyAliases
      ? [modifierKeyAliases[modifier]]
      : multiModifierAliases[modifier]
  return mapSimultaneous(keys.split('')).to(`left_${firstMod}`, restMods)
}

export const rules = () => [
  rule('duo-modifiers').manipulators([
    duoModifier('fd', '⌘'),
    duoModifier('fs', '⌃'),
    duoModifier('fa', '⌥'),

    duoModifier('ds', '⇧'),

    duoModifier('gd', '⌘⇧'),
    duoModifier('gs', '⌃⇧'),
    duoModifier('ga', '⌥⇧'),

    duoModifier('vc', '⌘⌥'),
    duoModifier('vx', '⌘⌃'),
    duoModifier('cx', '⌥⌃'),

    duoModifier('vz', '⌘⌥⌃'),

    duoModifier('jk', '⌘'),
    duoModifier('jl', '⌃'),
    duoModifier('j;', '⌥'),

    duoModifier('kl', '⇧'),

    duoModifier('hk', '⌘⇧'),
    duoModifier('hl', '⌃⇧'),
    duoModifier('h;', '⌥⇧'),

    duoModifier('m,', '⌘⌥'),
    duoModifier('m.', '⌘⌃'),
    duoModifier(',.', '⌥⌃'),

    duoModifier('m/', '⌘⌥⌃'),
  ]),
]

Or copy the JSON below and add it to Karabiner-Elements without changes:

{
  "description": "duo-modifiers",
  "manipulators": [
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "f"
          },
          {
            "key_code": "d"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "f"
          },
          {
            "key_code": "s"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_control",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "f"
          },
          {
            "key_code": "a"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_option",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "d"
          },
          {
            "key_code": "s"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_shift",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "g"
          },
          {
            "key_code": "d"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "shift"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "g"
          },
          {
            "key_code": "s"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_control",
          "modifiers": [
            "shift"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "g"
          },
          {
            "key_code": "a"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_option",
          "modifiers": [
            "shift"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "v"
          },
          {
            "key_code": "c"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "option"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "v"
          },
          {
            "key_code": "x"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "control"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "c"
          },
          {
            "key_code": "x"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_option",
          "modifiers": [
            "control"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "v"
          },
          {
            "key_code": "z"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "option",
            "control"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "j"
          },
          {
            "key_code": "k"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "j"
          },
          {
            "key_code": "l"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_control",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "j"
          },
          {
            "key_code": "semicolon"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_option",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "k"
          },
          {
            "key_code": "l"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_shift",
          "modifiers": []
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "h"
          },
          {
            "key_code": "k"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "shift"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "h"
          },
          {
            "key_code": "l"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_control",
          "modifiers": [
            "shift"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "h"
          },
          {
            "key_code": "semicolon"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_option",
          "modifiers": [
            "shift"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "m"
          },
          {
            "key_code": "comma"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "option"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "m"
          },
          {
            "key_code": "period"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "control"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "comma"
          },
          {
            "key_code": "period"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_option",
          "modifiers": [
            "control"
          ]
        }
      ]
    },
    {
      "type": "basic",
      "from": {
        "simultaneous": [
          {
            "key_code": "m"
          },
          {
            "key_code": "slash"
          }
        ]
      },
      "to": [
        {
          "key_code": "left_command",
          "modifiers": [
            "option",
            "control"
          ]
        }
      ]
    }
  ]
}