my-nvim-setup/lua/mappings.lua

local function map(mode, lhs, rhs, opts)
    local options = {noremap = true, silent = true}
    if opts then
        options = vim.tbl_extend("force", options, opts)
    end
    vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end

local opt = {}

-- dont copy any deleted text , this is disabled by default so uncomment the below mappings if you want them
--[[ remove this line

map("n", "dd", [=[ "_dd ]=], opt)
map("v", "dd", [=[ "_dd ]=], opt)
map("v", "x", [=[ "_x ]=], opt)

 this line too ]]
--

-- escape with 'jk' mapping
vim.api.nvim_set_keymap("i", "jk", "<esc>", {})
vim.api.nvim_set_keymap("v", "jk", "<esc>", {})
vim.api.nvim_set_keymap("t", "jk", "<esc>", {})

-- Don't copy the replaced text after pasting in visual mode
map("v", "p", '"_dP', opt)

-- OPEN TERMINALS --
map("n", "<C-l>", ":vnew +terminal | setlocal nobuflisted <CR>", opt) -- term over right
map("n", "<C-x>", ":10new +terminal | setlocal nobuflisted <CR>", opt) --  term bottom
map("n", "<C-t>t", ":<Cmd> terminal <CR>", opt) -- term buffer

-- copy whole file content
map("n", "<C-a>", ":%y+<CR>", opt)

-- toggle numbers
map("n", "<leader>n", ":set nu!<CR>", opt)

-- Truezen.nvim
map("n", "<leader>zz", ":TZAtaraxis<CR>", opt)
map("n", "<leader>zm", ":TZMinimalist<CR>", opt)
map("n", "<leader>zf", ":TZFocus<CR>", opt)

map("n", "<C-s>", ":w <CR>", opt)

-- Commenter Keybinding
map("n", "<leader>/", ":CommentToggle<CR>", opt)
map("v", "<leader>/", ":CommentToggle<CR>", opt)

-- compe stuff
local t = function(str)
    return vim.api.nvim_replace_termcodes(str, true, true, true)
end

local check_back_space = function()
    local col = vim.fn.col(".") - 1
    if col == 0 or vim.fn.getline("."):sub(col, col):match("%s") then
        return true
    else
        return false
    end
end

_G.tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t "<C-n>"
    elseif check_back_space() then
        return t "<Tab>"
    else
        return vim.fn["compe#complete"]()
    end
end

_G.s_tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t "<C-p>"
    elseif vim.fn.call("vsnip#jumpable", {-1}) == 1 then
        return t "<Plug>(vsnip-jump-prev)"
    else
        return t "<S-Tab>"
    end
end

function _G.completions()
    local npairs
    if
        not pcall(
            function()
                npairs = require "nvim-autopairs"
            end
        )
     then
        return
    end

    if vim.fn.pumvisible() == 1 then
        if vim.fn.complete_info()["selected"] ~= -1 then
            return vim.fn["compe#confirm"]("<CR>")
        end
    end
    return npairs.check_break_line_char()
end

--  compe mappings
map("i", "<Tab>", "v:lua.tab_complete()", {expr = true})
map("s", "<Tab>", "v:lua.tab_complete()", {expr = true})
map("i", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
map("s", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
map("i", "<CR>", "v:lua.completions()", {expr = true})

-- nvimtree
map("n", "<C-n>", ":NvimTreeToggle<CR>", opt)

-- format code
map("n", "<Leader>fm", ":Neoformat<CR>", opt)

-- dashboard stuff
map("n", "<Leader>db", ":Dashboard<CR>", opt)
map("n", "<Leader>fn", ":DashboardNewFile<CR>", opt)
map("n", "<Leader>bm", ":DashboardJumpMarks<CR>", opt)
map("n", "<C-s>l", ":SessionLoad<CR>", opt)
map("n", "<C-s>s", ":SessionSave<CR>", opt)

-- Telescope
map("n", "<Leader>fw", ":Telescope live_grep<CR>", opt)
map("n", "<Leader>gt", ":Telescope git_status <CR>", opt)
map("n", "<Leader>cm", ":Telescope git_commits <CR>", opt)
map("n", "<Leader>ff", ":Telescope find_files <CR>", opt)
map("n", "<Leader>fp", ":lua require('telescope').extensions.media_files.media_files()<CR>", opt)
map("n", "<Leader>fb", ":Telescope buffers<CR>", opt)
map("n", "<Leader>fh", ":Telescope help_tags<CR>", opt)
map("n", "<Leader>fo", ":Telescope oldfiles<CR>", opt)

-- bufferline tab stuff
map("n", "<S-t>", ":enew<CR>", opt) -- new buffer
map("n", "<C-t>b", ":tabnew<CR>", opt) -- new tab
map("n", "<S-x>", ":bd!<CR>", opt) -- close tab

-- move between tabs
map("n", "<TAB>", ":BufferLineCycleNext<CR>", opt)
map("n", "<S-TAB>", ":BufferLineCyclePrev<CR>", opt)

-- use ESC to turn off search highlighting
map("n", "<Esc>", ":noh<CR>", opt)

-- get out of terminal with jk
map("t", "jk", "<C-\\><C-n>", opt)

-- Vim Fugitive
map("n", "<Leader>gs", ":Git<CR>", opt)
map("n", "<Leader>gh", ":diffget //2<CR>", opt)
map("n", "<Leader>gl", ":diffget //3<CR>", opt)
map("n", "<Leader>gb", ":Git blame<CR>", opt)