jones-nvim-config/lua/keymaps.lua

local fterm = require('FTerm')
local keymap = vim.api.nvim_set_keymap
local opts = { noremap = true, silent = true }
local api = vim.api

-- Custom commands
api.nvim_create_user_command('FTermToggle', fterm.toggle, { bang = true })
api.nvim_create_user_command('FTermClose', fterm.close, { bang = true })

local mappings = {
    n = {
        -- highlighting
        ["<leader>nh"] = ":nohl<CR>",
        -- move between buffers
        ["<c-h>"]      = "<C-w>h",
        ["<c-j>"]      = "<C-w>j",
        ["<c-k>"]      = "<C-w>k",
        ["<c-l>"]      = "<C-w>l",
        -- open and close buggers
        ["<leader>sv"] = "<C-w>s",
        ["<leader>sh"] = "<C-w>v",
        ["<leader>se"] = "<C-w>=",
        ["<leader>sx"] = ":close<CR>",
        -- nvim-tree
        ["<leader>e"]  = ":NvimTreeToggle<CR>",
        ["<leader>cf"] = ":NvimTreeCollapse<CR>",
        -- LSP
        ["<leader>ls"] = ":lspstop<CR>",
        ["<leader>lo"] = ":lspstart<CR>",
        -- Telescope
        ["<leader>ff"] = "<cmd>Telescope find_files<CR>",
        ["<leader>fw"] = "<cmd>Telescope live_grep<CR>",
        ["<leader>fc"] = "<cmd>Telescope grep_string<CR>",
        ["<leader>th"] = "<cmd>Themery<CR>",
        ["<leader>sm"] = ":MaximizerToggle<CR>",
        -- FTerm
        ["<leader>h"]  = "<cmd>FTermToggle<CR>"
    },
    x = {
        ["<A-j>"] = ":move '>+1<CR>gv-gv",
        ["<A-k>"] = ":move '<-2<CR>gv-gv",
    },
    i = {
        ["<C-Space>"] = { 'copilot#Accept("<CR>")', expr = true },
        ["<A-l>"] = "<esc>",
    },
    t = {
        ["A-l"] = "<cmd>FTermClose<CR>"
    }
}

for mode, mode_mappings in pairs(mappings) do
    for key, mapping in pairs(mode_mappings) do
        if type(mapping) == "function" then
            -- For direct Lua function calls; ensure your function returns a string command
            keymap(mode, key, "<cmd>lua " .. mapping() .. "<CR>", opts)
        elseif type(mapping) == "table" and mapping.expr then
            -- For expression mappings, like for copilot
            local expr_opts = vim.tbl_extend("force", opts, { expr = true })
            keymap(mode, key, mapping[1], expr_opts)
        elseif type(mapping) == "table" then
            -- For mappings that have their options specified directly
            keymap(mode, key, mapping[1], mapping[2] or opts)
        else
            -- For simple string command mappings
            keymap(mode, key, mapping, opts)
        end
    end
end