nixos-configs/common/home/neovim/plugins/neotree.lua

-- Override netrw
vim.g.loaded_netrw = 0;
vim.g.loaded_netrwPlugin = 0;

require('neo-tree').setup({
    close_if_last_window = true,
    enable_refresh_on_write = true,

    window = {
        width = 22,
    },

    filesystem = {
        use_libuv_file_watcher = true,
        group_empty_dirs = true,

        filtered_items = {
            visible = false,
            hide_dotfiles = false,
            hide_gitignored = false,
            hide_by_name = {},
            hide_by_pattern = {},
            always_show = {},
            never_show = {},
            never_show_by_pattern = {},
        },
    },

    source_selector = {
        winbar = true,
        statusline = false,
    },

    follow_current_file = {
        enabled = true,
        leave_dirs_open = true,
    },
});

local function is_neotree_open()
    local manager = require('neo-tree.sources.manager');
    local renderer = require('neo-tree.ui.renderer');
    local state = manager.get_state('filesystem');
    return renderer.window_exists(state);
end;

-- Auto open Neo-Tree on big enough window
vim.api.nvim_create_autocmd({ 'VimEnter', 'VimResized' }, {
    pattern = '*',
    callback = function()
        if vim.api.nvim_eval([[&columns]]) > 100 then
            if is_neotree_open() == false then
                vim.cmd[[Neotree show]];
                vim.cmd[[Neotree close]];
                vim.cmd[[Neotree show]];
            end;
        else
            if is_neotree_open() then
                vim.cmd[[Neotree close]];
            end;
        end;
    end,
});