nix/common/nvim.lua

local opt = vim.opt
local g = vim.g

vim.cmd [[
  colorscheme onehalflight

  if has("autocmd")
    au BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$") | exe "normal! g'\"" | endif
  endif

  autocmd Filetype json
    \ let g:indentLine_setConceal = 0 |
    \ let g:vim_json_syntax_conceal = 0
]]

g.mapleader = ' '
g.indentLine_char = '⎸'
g.indentLine_color_gui = '#c7c7c7'

opt.undofile = true
opt.undodir = "/home/sijmen/.cache/nvim/undo"
opt.backupdir = "/home/sijmen/.cache/nvim/backup"

opt.smartindent = true
opt.autoindent = true
opt.tabstop = 2
opt.shiftwidth = 2
opt.expandtab = true

opt.mouse = "a"

opt.termguicolors = true
opt.cursorline = true
opt.relativenumber = true
opt.number = true

opt.smartcase = true
opt.ttimeoutlen = 5
opt.compatible = false
opt.autoread = true
opt.incsearch = true
opt.hidden = true
opt.shortmess = "atI"


require("nvim-tree").setup()

require("lualine").setup {
  options = {
    component_separators = { left = "", right = "" },
    section_separators = { left = "", right = "" },
  },
}

require("nvim-treesitter.configs").setup {
  auto_install = true,
  highlight = { enable = true },
  parser_install_dir = "/home/sijmen/.cache/nvim/treesitter",
}

vim.opt.runtimepath:append("/home/sijmen/.cache/nvim/treesitter")


local opts = { noremap=true, silent=true }
vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, opts)
vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)

local on_attach = function(client, bufnr)
  vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

  local bufopts = { noremap=true, silent=true, buffer=bufnr }
  vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
  vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
  vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, bufopts)
  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts)

  vim.keymap.set('n', '<space>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, bufopts)

  vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, bufopts)
  vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, bufopts)
  vim.keymap.set('n', '<space>ca', vim.lsp.buf.code_action, bufopts)
  vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
  vim.keymap.set('n', '<space>f', vim.lsp.buf.formatting, bufopts)
end


local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require("cmp_nvim_lsp").update_capabilities(capabilities)

local lspconfig = require("lspconfig")
local servers = { "rnix", "pyright", "rust_analyzer" }
for _, lsp in ipairs(servers) do
  lspconfig[lsp].setup {
    on_attach = on_attach,
    capabilities = capabilities,
  }
end

local luasnip = require("luasnip")

local cmp = require("cmp")
cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },
  mapping = cmp.mapping.preset.insert({
    ["<C-d>"] = cmp.mapping.scroll_docs(-4),
    ["<C-f>"] = cmp.mapping.scroll_docs(4),
    ["<C-Space>"] = cmp.mapping.complete(),
    ["<CR>"] = cmp.mapping.confirm {
      behavior = cmp.ConfirmBehavior.Replace,
      select = true,
    },
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      else
        fallback()
      end
    end, { "i", "s" }),
    ["<S-Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, { "i", "s" }),
  }),
  sources = {
    { name = "nvim_lsp" },
    { name = "luasnip" },
  },
}

vim.api.nvim_set_keymap("n", "<C-b>", ":NvimTreeToggle<CR>", { noremap = true, silent = true })