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wezterm/docs/config/lua/window-events/open-uri.md

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open-uri

The open-uri event is emitted when the CompleteSelectionOrOpenLinkAtMouseCursor key/mouse assignment is triggered.

The default action is to open the active URI in your browser, but if you register for this event you can co-opt the default behavior.

For example, if you prefer to launch your preferred MUA in a new window in response to clicking on mailto: URLs, you could do something like:

local wezterm = require 'wezterm'

wezterm.on('open-uri', function(window, pane, uri)
  local start, match_end = uri:find 'mailto:'
  if start == 1 then
    local recipient = uri:sub(match_end + 1)
    window:perform_action(
      wezterm.action.SpawnCommandInNewWindow {
        args = { 'mutt', recipient },
      },
      pane
    )
    -- prevent the default action from opening in a browser
    return false
  end
  -- otherwise, by not specifying a return value, we allow later
  -- handlers and ultimately the default action to caused the
  -- URI to be opened in the browser
end)

The first event parameter is a window object that represents the gui window.

The second event parameter is a pane object that represents the pane.

The third event parameter is the URI string.