basics

plugin/keymap.lua

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+-- define common options
+local opts = {
+    noremap = true,      -- non-recursive
+    silent = true,       -- do not show message
+}
+local map = vim.keymap.set
+
+vim.g.mapleader = ' '
+-----------------
+-- Normal mode --
+-----------------
+
+-- Hint: see `:h vim.map.set()`
+-- Better window navigation
+map('n', '<leader>wh', '<C-w>h', opts)
+map('n', '<leader>wj', '<C-w>j', opts)
+map('n', '<leader>wk', '<C-w>k', opts)
+map('n', '<leader>wl', '<C-w>l', opts)
+
+local step_size = 4
+map('n', '<leader>wJ', ':resize -'.. step_size ..'<CR>', opts)
+map('n', '<leader>wK', ':resize +'.. step_size ..'<CR>', opts)
+map('n', '<leader>wH', ':vertical resize -'.. step_size ..'<CR>', opts)
+map('n', '<leader>wL', ':vertical resize +'.. step_size ..'<CR>', opts)
+
+map('n', '<leader>wn', ':windo new<CR>', opts)
+map('n', '<leader>wc', ':close<CR>', opts)
+
+-- tab management
+map('n', '<tab>', ':tabnext<CR>', opts)
+map('n', '<leader>x', ':tabclose<CR>', opts)
+map('n', '<leader>s', ':$tab split<CR>', opts)
+
+
+-----------------
+-- Visual mode --
+-----------------
+
+--vim.keymap.set('v', '<', '<gv', opts)
+--vim.keymap.set('v', '>', '>gv', opts)

plugin/options.lua

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+-- Hint: use `:h <option>` to figure out the meaning if needed
+vim.opt.clipboard = 'unnamedplus'   -- use system clipboard 
+vim.opt.completeopt = {'menu', 'menuone', 'noselect'}
+vim.opt.mouse = 'a'                 -- allow the mouse to be used in Nvim
+
+-- Tab
+local tabstops = 4
+vim.opt.tabstop = tabstops          -- number of visual spaces per TAB
+vim.opt.softtabstop = tabstops      -- number of spacesin tab when editing
+vim.opt.shiftwidth = tabstops       -- insert 4 spaces on a tab
+vim.opt.expandtab = true            -- tabs are spaces, mainly because of python
+
+-- UI config
+vim.opt.number = true               -- add numbers to each line on the left side
+vim.opt.relativenumber = true       -- show relative numbers
+vim.opt.cursorline = true           -- highlight cursor line underneath the cursor horizontally
+vim.opt.splitbelow = true           -- open new vertical split bottom
+vim.opt.splitright = true           -- open new horizontal splits right
+vim.opt.termguicolors = true        -- enabl 24-bit RGB color in the TUI
+vim.opt.showmode = true             -- we are experienced,we know we need the "-- INSERT --" mode hint
+
+-- Searching
+vim.opt.incsearch = true            -- search as characters are entered
+vim.opt.hlsearch = true             -- highlight matches
+vim.opt.ignorecase = true           -- ignore case in searches by default
+vim.opt.smartcase = true            -- but make it case sensitive if an uppercase is entered