How to define a keymap to toggle btw dark and light modes?

[hopezh]

May I ask how to define a keymap in tokyonight config to toggle btw dark and light modes?

Similarly, how to define a keymap to toggle the transparent mode?

Thanks.

[kkafar]

Hey @hopezh, I might be far from the point but there is option light_style which you could set to day, e.g.:

require("tokyonight").setup({
    style = 'moon',
    light_style = 'day',
})

-- default value
vim.opt.background = "dark" 

and then define user command to toggle between the two:

  vim.api.nvim_create_user_command('ToggleTheme', function (input)
    if vim.opt.background == "dark" then
        vim.opt.background = "light"
    else
        vim.opt.background = "dark"
    end
  end, {})

  -- also define the keymap
  vim.keymap.set("n", "<leader>t", vim.cmd.ToggleTheme, {})

I haven't tested this, writing from top of my head, but it might me worth trying out.

I'm personally handling it telescope theme picker builtin.coloscheme. Worth checking out.

Edit: If changing value of vim.opt.background does not have effect on theme applied by tokyonight you can also set the theme directly:

  vim.api.nvim_create_user_command('ToggleTheme', function (input)
    if vim.opt.background == "dark" then
        vim.opt.background = "light"
        vim.cmd("colorscheme tokyonight-day")
    else
        vim.opt.background = "dark"
        vim.cmd("colorscheme tokyonight-moon")
    end
  end, {})

  -- also define the keymap
  vim.keymap.set("n", "<leader>t", vim.cmd.ToggleTheme, {})

[hopezh]

Thank you, @kkafar

However, I'm unable to get it to work.

My config is this oatLazyVim.

I put the script you suggested in the lua/config/options.lua file, and I set <leader>ut as the keymap to toggle the theme.

[hopezh]

But the Telescope builtin colorsheme picker as you suggested is very handy, as activated by using <leader>uC in lazyvim:

[kkafar]

Hey @hopezh, I've managed to get the toggler working with following code:

1. Tokyonight configuration

require("tokyonight").setup({
    style = 'moon',
    light_style = 'day',
})

-- default value
vim.opt.background = "dark" 

2. Theme toggler

local function toggle_theme()
  if vim.opt.background:get() == "dark" then
    vim.opt.background = "light"
    -- In my case it was unnecessary to set theme directly,
    -- as tokyonight reacted to change of vim.opt.background
    -- vim.cmd("colorscheme tokyonight-day")
  else
    vim.opt.background = "dark"
    -- vim.cmd("colorscheme tokyonight-moon")
  end
end

vim.keymap.set("n", "<leader>ut", toggle_theme, {})

The difference from previous snippet is that to get vim.opt.background value we need to use its getter: vim.opt.background:get().

Edit note: I'm putting this code into my after/plugin directory.
See here

Regarding toggling the transparent mode: it should be doable in very similar way - if you follow the link above - it seems that there is vim.g.tokyonight_trasparent variable responsible for this. There is a chance toggling it's value would work :D