my-nvim-setup/lua/core.lua

local keys = require "custom_keys"
local opts = require "custom_opts"

-- Setup keymapping
local function set_keymap()
  local map = vim.keymap.set
  local option = { noremap = true, silent = true }

  map("n", keys.jump_left_window, "<C-W>h", option)
  map("n", keys.jump_down_window, "<C-W>j", option)
  map("n", keys.jump_up_window, "<C-W>k", option)
  map("n", keys.jump_right_window, "<C-W>l", option)

  -- View documentation and signature details
  map("n", "K", vim.lsp.buf.hover, option)
  map({ "n", "i" }, "<C-k>", vim.lsp.buf.signature_help, option)

  vim.cmd [[
    " press esc to cancel search highlight
    nnoremap <silent> <Esc> :nohlsearch<CR>:echo<CR>
	]]

  -- Remove the `~` for blank lines by setting its color to be the same as background
  vim.cmd "hi NonText guifg=bg"

  -- for markdown file
  vim.cmd [[
    " optimized up and down move when set wrap for markdown file
    autocmd FileType markdown noremap <buffer> j gj
    autocmd FileType markdown noremap <buffer> k gk
	autocmd FileType markdown setlocal wrap
	]]

  -- Supported by bufdelete
  vim.cmd [[
	cnoreabbrev bdelete Bdelete
	cnoreabbrev bdelete! Bdelete!
	cnoreabbrev bwipeout Bwipeout
	cnoreabbrev bwipeout! Bwipeout!
	]]

  -- Supported by bufferline
  map("n", keys.pick_tab, ":BufferLinePick<CR>", option)

  -- Supported by nvim-tree
  map("n", keys.file_explorer, ":Neotree position=left source=filesystem action=show toggle=true<CR>", option)
  map("n", keys.git_status, ":Neotree position=float source=git_status action=show toggle=true<CR>", option)

  -- Supported by aerial
  map("n", keys.outline, ":AerialToggle! right<CR>", option)

  -- Supported by diffview
  map("n", keys.diff_open, ":DiffviewOpen<CR>", option)
  map("n", keys.diff_close, ":DiffviewClose<CR>", option)

  -- Supported by toggleterm
  -- float terminal
  local float_terminal_default = require("toggleterm.terminal").Terminal:new {
    direction = "float",
    on_open = function(term)
      -- forced to change the working dir for terminal
      -- This will solve the problem of not updating the directory when switching sessions.
      local cwd = vim.fn.getcwd()
      if cwd ~= term.dir then
        term:change_dir(cwd)
      end
      -- when float term opened, disable bottom terminal
      vim.api.nvim_del_keymap("t", keys.terminal_bottom)
      vim.cmd "startinsert!"
    end,
    on_close = function(t, job, exit_code, name)
      -- when float term closed, enable bottom terminal
      map("t", keys.terminal_bottom, "<C-\\><C-n>:lua _bottom_term_toggle()<CR>", option)
    end,
  }
  function _float_term_toggle()
    float_terminal_default:toggle()
  end

  -- bottom terminal
  local bottom_terminal_default = require("toggleterm.terminal").Terminal:new {
    direction = "horizontal",
    on_open = function(term)
      -- forced to change the working dir for terminal
      -- This will solve the problem of not updating the directory when switching sessions.
      local cwd = vim.fn.getcwd()
      if cwd ~= term.dir then
        term:change_dir(cwd)
      end

      -- set keymapping
      local opts = { buffer = 0 }
      vim.api.nvim_buf_set_keymap(term.bufnr, "t", "<C-h>", [[<Cmd>wincmd h<CR>]], { noremap = true, silent = true })
      vim.api.nvim_buf_set_keymap(term.bufnr, "t", "<C-j>", [[<Cmd>wincmd j<CR>]], { noremap = true, silent = true })
      vim.api.nvim_buf_set_keymap(term.bufnr, "t", "<C-k>", [[<Cmd>wincmd k<CR>]], { noremap = true, silent = true })
      vim.api.nvim_buf_set_keymap(term.bufnr, "t", "<C-l>", [[<Cmd>wincmd l<CR>]], { noremap = true, silent = true })
      vim.cmd "startinsert!"
    end,
    on_exit = function(t, job, exit_code, name)
      vim.cmd "quit!"
    end,
  }
  function _bottom_term_toggle()
    bottom_terminal_default:toggle()
  end

  map("n", keys.terminal_float, ":lua _float_term_toggle()<CR>", option)
  map("t", keys.terminal_float, "<C-\\><C-n>:lua _float_term_toggle()<CR>", option)
  map("n", keys.terminal_bottom, ":lua _bottom_term_toggle()<CR>", option)
  map("t", keys.terminal_bottom, "<C-\\><C-n>:lua _bottom_term_toggle()<CR>", option)

  vim.cmd [[
    command! Termfloat :lua _float_term_toggle()
    ]]
  vim.cmd [[cnoreabbrev terminal Termfloat]]

  -- Supported by nvim-session-manager
  map("n", keys.switch_session, ":SessionManager load_session<CR>", option)
end

-- Set up transparency
local function set_transparency()
  local transparency = opts.window_transparency
  -- Setup global transparency for float window.
  vim.api.nvim_command(string.format("autocmd FileType * set winblend=%d", transparency))
  -- Setup global transparency for popup menu.
  vim.o.pumblend = transparency
end

-- Set up auto command
local function set_autocmd() end

set_keymap()
set_transparency()
set_autocmd()