nixos/lua/config_plugins/config_toggleterm.lua

require('toggleterm').setup {
    direction = 'horizontal',
    open_mapping = [[\t]],
    size = function (term)
        if term.direction == "horizontal" then
            return 15
        elseif term.direction == "vertical" then
            return vim.o.columns * 0.3
        end
    end,
    hide_numbers = true, -- hide the number column in toggleterm buffers
    persist_size = false,
}

function _G.set_terminal_keymaps()
    local opts = { buffer = 0 }
    vim.keymap.set('t', '<C-h>', [[<Cmd>wincmd h<CR>]], opts)
    vim.keymap.set('t', '<C-j>', [[<Cmd>wincmd j<CR>]], opts)
    vim.keymap.set('t', '<C-k>', [[<Cmd>wincmd k<CR>]], opts)
    vim.keymap.set('t', '<C-l>', [[<Cmd>wincmd l<CR>]], opts)
end

vim.cmd('autocmd! TermOpen term://* lua set_terminal_keymaps()')