Sunset.nvim :sunrise:

An automatic theme switcher for Neovim that uses precise sunrise/sunset times based on your latitude and longitude.

Sun times are calculated locally so the plugin does not require an internet connection to function. The plugin uses a libuv timer to ensure that the theme is updated whilst Neovim is open without the need for a restart.

Installation

Install using your preferred method and call the setup function to load the plugin. The function accepts a table for overriding the default configuration:

require("sunset").setup({
    latitude = 51.5072, -- north is positive, south is negative
    longitude = -0.1276, -- east is positive, west is negative
    sunrise_offset = 0, -- offset the sunrise by this many seconds
    sunset_offset = 0, -- offset the sunset by this many seconds
    sunrise_override = nil, -- accepts a time in the form "HH:MM" which will override the sunrise time
    sunset_override = nil, -- accepts a time in the form "HH:MM" which will override the sunset time
    day_callback = nil, -- function that is called when day begins
    night_callback = nil, -- function that is called when night begins
    update_interval = 60000, -- how frequently to check for sunrise/sunset changes in milliseconds
    time_format = "%H:%M", -- sun time formatting using os.date https://www.lua.org/pil/22.1.html
})

I recommend ensuring that Sunset.nvim loads after any colorscheme plugins to reduce the likelihood of issues.

Here's how I load my colorscheme plugin and sunset.nvim with lazy.nvim:

{
    "JManch/sunset.nvim",
    dependencies = {
        {
            "colorscheme plugin",
            config = function
                -- Colorscheme plugin config
            end,
        },
    },
    lazy = false,
    priority = 1000,
    opts = {
        latitude = 51.5072,
        longitude = -0.1276,
    },
}

Usage

By default, the plugin changes the background option between light and dark. If you would like the change this behaviour, you can set the day_callback or night_callback which will disable the background switching. For example:

day_callback = function()
    vim.cmd("colorscheme foo")
end

If you would like to show the sun status in your statusline, sunset.nvim sets the following global variables:

vim.g.is_day -- boolean
vim.g.sunrise -- next sunrise time string formatted using time_format option
vim.g.sunset -- next sunset time string formatted using time_format option

The plugin has the following commands:

• SunsetTimes - view the next sunrise/sunset times
• SunsetToggle - toggle between day and night theme

Note on highlight groups

If you find that sunset.nvim is clearing your custom highlight groups every time you switch themes, you need to set highlight groups in a ColorScheme autocommand. More info here.