Possible to change a wezterm config (like line_height) programmatically from e.g. neovim?

[miguno]

I am using neovim inside wezterm, and I am looking for a way to change the wezterm line_height depending on whether neovim has entered Zen mode for focused writing.

I can change neovim-related settings when zen mode is entered, but was wondering whether there is an API or CLI feature that would allow me to also interact with wezterm from within neovim.

[wez]

Take a look at user vars; https://wezfurlong.org/wezterm/config/lua/window-events/user-var-changed.html is triggered when a user var is changed. You could have your nvim integration set a user var named something like NVIM_ZEN_MODE and then have some corresponding lua code set config overrides based on the value of the user var.

[miguno]

Thank you for the quick response and the useful pointers!

Here's how I was able to set this up with neovim 0.8.1 and wezterm 20221119-145034-49b9839f in case other users have a similar question.

wezterm configuration

wezterm.on('user-var-changed', function(window, pane, name, value)
    -- Increase the line height of wezterm when we enter zen mode in neovim
    if name == "NVIM_ZEN_MODE" then
        local overrides = window:get_config_overrides() or {}
        if value == "1" and not overrides.line_height then
            overrides.line_height = 1.3
        else
            overrides.line_height = nil
        end
        window:set_config_overrides(overrides)
    end
end)

return {
    -- Terminal defaults
    line_height = 1.0,
    ...
}

neovim configuration

-- Plugin configuration for https://github.com/folke/zen-mode.nvim
require("zen-mode").setup {
  -- callback where you can add custom code when the Zen window opens
  on_open = function(win)
    -- Equivalent of
    --    $ printf "\033]1337;SetUserVar=%s=%s\007" NVIM_ZEN_MODE `echo -n 1 | base64`
    -- "MQ==" is `echo -n 1 | base64`.
    vim.cmd([[call chansend(v:stderr, "\033]1337;SetUserVar=NVIM_ZEN_MODE=MQ==\007")]])
  end,
  -- callback where you can add custom code when the Zen window closes
  on_close = function()
    -- Equivalent of
    --    $ printf "\033]1337;SetUserVar=%s=%s\007" NVIM_ZEN_MODE `echo -n 0 | base64`
    -- "MA==" is `echo -n 0 | base64`.
    vim.cmd([[call chansend(v:stderr, "\033]1337;SetUserVar=NVIM_ZEN_MODE=MA==\007")]])
  end,
}

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