init.lua

--[[
-- Arthur Soulié 2025
-- This configuration is hosted at https://github.com/ArthurS1/nvim-init
--]]
local nvim_version = vim.version()
vim.cmd('echo \"Configuration by Arthur Soulié 2026\"')

-- Leader key
-- [[
-- Must be done before any vim.keymap.set() call (yes, even the plugins)
-- according to
-- https://neovim.discourse.group/t/how-to-set-leader-key-in-lua/175/6
-- ]]
vim.g.mapleader = ','

-- Plugins
--[[
-- From https://dev.to/vonheikemen/neovim-using-vim-plug-in-lua-3oom for vim
-- plug usage in lua.
--]]

local Plug = vim.fn['plug#']

vim.call('plug#begin', '~/.config/nvim/plugins')
Plug('junegunn/fzf',{['do'] = vim.fn['fzf#install']})
Plug('junegunn/fzf.vim')
Plug('neovim/nvim-lspconfig')
Plug('hrsh7th/nvim-cmp')
Plug('hrsh7th/cmp-nvim-lsp')
Plug('hrsh7th/cmp-buffer')
Plug('hrsh7th/cmp-vsnip')
Plug('hrsh7th/vim-vsnip')
Plug('hrsh7th/vim-vsnip')
Plug('tpope/vim-fugitive')
vim.call('plug#end')

-- General Options

local extended_tabs_filetypes = {'c', 'cpp'}
local no_spaced_tabs_filetypes = {'make'}
local default_tabs = 2
local extended_tabs = 4
local home_dir = '/home/arthur'

vim.api.nvim_set_option('dir', home_dir .. '/.config/nvim/tmp')
vim.api.nvim_win_set_option(0, 'number', true)
vim.api.nvim_win_set_option(0, 'relativenumber', true)
vim.api.nvim_win_set_option(0, 'foldlevel', 1)
vim.api.nvim_win_set_option(0, 'foldmethod', 'indent')
vim.api.nvim_win_set_option(0, 'foldclose', 'all')
vim.api.nvim_win_set_option(0, 'foldenable', false)
vim.api.nvim_win_set_option(0, 'ignorecase', true)
vim.api.nvim_win_set_option(0, 'shiftwidth', default_tabs)
vim.o.exrc = true
vim.opt.clipboard = 'unnamedplus'

vim.api.nvim_set_keymap('t', '<esc>', '<c-\\><c-n>', {})
vim.api.nvim_set_keymap('', ';', ':GitFiles<cr>', {})
vim.api.nvim_set_keymap('i', '(', '()<left>', {})
vim.api.nvim_set_keymap('i', '[', '[]<left>', {})
vim.api.nvim_set_keymap('i', '{', '{}<left>', {})

--[[
-- Changes the tab length depending on filetype according to the variables on
-- top of this section.
--]]
vim.api.nvim_create_autocmd({'FileType'}, {
  callback = function ()
    vim.api.nvim_buf_set_option(0, 'expandtab', true)
    vim.api.nvim_buf_set_option(0, 'shiftwidth', default_tabs)
    vim.api.nvim_buf_set_option(0, 'tabstop', default_tabs)
    return false
  end
})

vim.api.nvim_create_autocmd({'FileType'}, {
  pattern = extended_tabs_filetypes,
  callback = function ()
    vim.api.nvim_buf_set_option(0, 'expandtab', true)
    vim.api.nvim_buf_set_option(0, 'shiftwidth', extended_tabs)
    vim.api.nvim_buf_set_option(0, 'tabstop', extended_tabs)
    return false
  end
})

-- [[
-- Switches off tabs made of spaces on specific filtypes. Configurable on top
-- of this section.
-- ]]
vim.api.nvim_create_autocmd({'FileType'}, {
  pattern = no_spaced_tabs_filetypes,
  callback = function ()
    vim.api.nvim_buf_set_option(0, 'expandtab', false)
    return false
  end
})

-- [[
-- Removes line numbers when in terminal mode
-- ]]
vim.api.nvim_create_autocmd('TermOpen', {
  callback = function ()
    vim.o.number = false
    vim.o.relativenumber = false
  end
})

--[[
-- Removes ueseless whitespaces at the end of each line. See
-- https://vim.fandom.com/wiki/Remove_unwanted_spaces
--]]
vim.api.nvim_create_autocmd({'BufWritePre'}, {
  command = ':%s/\\s\\+$//e'
})

-- [[
-- Add lsp related shortcuts. See help lsp.
-- ]]
vim.api.nvim_create_autocmd({'LspAttach'}, {
  callback = function ()
    vim.keymap.set('n', '<Leader>=', vim.lsp.buf.format)
    vim.keymap.set('n', '<Leader>g', vim.lsp.buf.definition)
    vim.keymap.set('n', '<Leader><Space>', vim.lsp.buf.hover)
    vim.keymap.set('n', '<Leader>r', vim.lsp.buf.rename)
    vim.keymap.set('n', '<Leader>e', vim.diagnostic.goto_next)
  end
})

-- Completion options
--[[
-- Got from https://github.com/neovim/nvim-lspconfig
--]]

vim.api.nvim_set_option('completeopt', 'menuone,noinsert,noselect')

local cmp = require'cmp'
local language_servers = require'languageservers'
local cmp_nvim_lsp = require'cmp_nvim_lsp'

cmp.setup({
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ['<Tab>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Insert }),
    ['<S-Tab>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Insert }),
    ['<CR>'] = cmp.mapping.confirm({ select = true }),
  },
  sources = {
    { name = 'nvim_lsp' },
    { name = 'vsnip' },
    { name = 'buffer' },
  }
})

cmp_nvim_lsp.default_capabilities()
language_servers.setup(cmp_nvim_lsp)