-- explore the directory of the current file (using netrw)
vim.keymap.set("n", "<leader>n", vim.cmd.Ex)

-- move selected lines up or down
vim.keymap.set("v", "J", ":m '>+1<CR>gv")
vim.keymap.set("v", "K", ":m '<-2<CR>gv")

-- vertically center cursor with half-page jumps iterating search results
vim.keymap.set("n", "<C-d>", "<C-d>zz")
vim.keymap.set("n", "<C-u>", "<C-u>zz")
vim.keymap.set("n", "n", "nzzzv")
vim.keymap.set("n", "N", "Nzzzv")

-- maintain cursor position after paragraph formatting
vim.keymap.set("n", "=ap", "ma=ap'a")

-- shortcuts for deleting into the void register
vim.keymap.set({ "n", "v" }, "<leader>d", "\"_d")
vim.keymap.set("x", "<leader>p", [["_dP]]) -- replace selected text, keep main register

-- shortcuts for using + register (system clipboard)
vim.keymap.set({ "n", "v" }, "<leader>y", [["+y]])
vim.keymap.set("n", "<leader>Y", [["+Y]])

-- search-and-replace shortcuts
vim.keymap.set("n", "<leader>rw", [[:%s/\<<C-r><C-w>\>/<C-r><C-w>/gI<Left><Left><Left>]])
vim.keymap.set("n", "<leader>ra", [[:%s//g<Left><Left>]])

-- toggle expandtab and show message
vim.keymap.set("n", "<leader>tab", function()
    if vim.opt.expandtab:get() then
        vim.opt.expandtab = false
        print("using actual tabs")
    else
        vim.opt.expandtab = true
        print("using spaces in place of tabs")
    end
end)

-- quicker switching between panes/splits
vim.keymap.set("n", "<C-h>", [[<C-w>h]])
vim.keymap.set("n", "<C-j>", [[<C-w>j]])
vim.keymap.set("n", "<C-k>", [[<C-w>k]])
vim.keymap.set("n", "<C-l>", [[<C-w>l]])

-- TODO: learn about quickfix (:help quickfix), then maybe use these
-- vim.keymap.set("n", "<C-k>", "<cmd>cnext<CR>zz")
-- vim.keymap.set("n", "<C-j>", "<cmd>cprev<CR>zz")
-- vim.keymap.set("n", "<leader>k", "<cmd>lnext<CR>zz")
-- vim.keymap.set("n", "<leader>j", "<cmd>lprev<CR>zz")