Neovim/lua/config/keys.lua

--
-- Global custom plugin agnostic keymaps
-- ..............................................
--
-- Author: Sven Vogel
-- Created: 01.11.2024
-- Edited: 01.11.2024
--
-- ==============================================

local keymaps = {
    --
    -- Write buffer to disk
    -- ..............................................
    {
        mode = { 'n', 'i' },
        keys = '<C-s>',
        cmd  = vim.cmd.write,
        desc = "Write buffer to disk"
    },
    {
        mode = { 'n', 'v', 'i' },
        keys = '<C-z>',
        cmd  = vim.cmd.undo,
        desc = "Undo last edit"
    },
    {
        mode = { 'n', 'v', 'i' },
        keys = '<C-y>',
        cmd  = vim.cmd.redo,
        desc = "Redo last edit that was undone"
    },
    --
    -- Buffer management
    -- ..............................................
    {
        mode = { 'n', 'i' },
        keys = '<C-t>',
        cmd  = '<cmd>:enew<cr>',
        desc = "Edit new, unnamed buffer"
    },
    --
    -- Window controls
    -- ..............................................
    {
        mode = { 'n', 'i' },
        keys = '<C-w>v',
        cmd  = '<cmd>:vsplit<cr>',
        desc = "Split window vertically"
    },
    {
        mode = { 'n', 'i' },
        keys = '<C-w>h',
        cmd  = '<cmd>:split<cr>',
        desc = "Split window horizontally"
    },
    {
        mode = { 'n' },
        keys = 'q',
        cmd  = function()
            -- list of file types to ignore when counting split buffers
            local ignore = { "neo-tree" }
            -- number of windows per tab
            local wins = vim.api.nvim_tabpage_list_wins(0)
            -- count of open windows without those on ignore list
            local count = 0

            -- check each window for its type
            for _, win in ipairs(wins) do
                local buf = vim.api.nvim_win_get_buf(win)
                local buf_type = vim.api.nvim_buf_get_option(buf, 'buftype')
                local file_type = vim.api.nvim_buf_get_option(buf, 'filetype')

                if buf_type == '' then

                    -- check if buffer is in ignore
                    in_ignore = false
                    for _, v in ipairs(ignore) do
                        if v == file_type then
                            in_ignore = true
                            break
                        end
                    end

                    if not in_ignore then
                        count = count + 1
                    end
                end
            end

            if count == 1 then
                -- only one buffer without any split
                -- account for barbar specific behavior
                vim.cmd('BufferClose')
            else
                -- close window
                vim.cmd('q')
            end
        end,
        desc = "Close buffer"
    },
    --
    -- Tab (barbar) controls
    -- ..............................................
    {
        mode = { 'n', 'i' },
        keys = '<C-tab>',
        cmd  = vim.cmd('BufferNext'),
        desc = "Switch to the next buffer"
    },
    {
        mode = { 'n', 'i' },
        keys = '<C-S-tab>',
        cmd  = vim.cmd('BufferPrevious'),
        desc = "Switch to the previous buffer"
    }
}

for _, keymap in pairs(keymaps) do
    local mode = keymap.mode
    local lhs = keymap.keys
    local rhs = keymap.cmd
    local opts = {
        desc = keymap.desc,
        noremap = keymap.noremap
    }
    vim.keymap.set(mode, lhs, rhs, opts)
end