SelectTextAtMouseCursor

Initiates selection of text at the current mouse cursor position. The mode argument can be one of Cell, Word or Line to control the scope of the selection.

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The mode argument can be SemanticZone which causes the selection to take the surrounding semantic zone.

In this example, the triple-left-click mouse action is set to automatically select the entire command output when clicking on any character within that region:

config.mouse_bindings = {
  {
    event = { Down = { streak = 3, button = 'Left' } },
    action = wezterm.action.SelectTextAtMouseCursor 'SemanticZone',
    mods = 'NONE',
  },
}

See Shell Integration docs for more details on how to set up your shell to define semantic zones.

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The mode argument can also be "Block" to enable a rectangular block selection.