dotfiles/nix/base-system/init.lua

-- theming
-- Default options
require('nightfox').setup({
  options = {
    -- Compiled file's destination location
    compile_path = vim.fn.stdpath("cache") .. "/nightfox",
    compile_file_suffix = "_compiled", -- Compiled file suffix
    transparent = false,     -- Disable setting background
    terminal_colors = true,  -- Set terminal colors (vim.g.terminal_color_*) used in `:terminal`
    dim_inactive = false,    -- Non focused panes set to alternative background
    module_default = true,   -- Default enable value for modules
  },
})
vim.cmd("colorscheme carbonfox")

-- Mason setup for lsp management
require("mason").setup({
    ui = {
        icons = {
            package_installed = "*",
            package_pending = ".";
    	    package_uninstalled = "-",
        },
    }
})
require("mason-lspconfig").setup()

--https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md

-- Nix language server support
require'lspconfig'.nil_ls.setup{}

-- This needs a path to the omnisharp dll provided
require'lspconfig'.omnisharp.setup {}

-- Java language server support
require'lspconfig'.java_language_server.setup{}

-- Typescript language server support
require'lspconfig'.tsserver.setup{}

-- Global lsp configuration
vim.api.nvim_create_autocmd('LspAttach', {
  callback = function(args)
    vim.keymap.set('n', '<C-space>', vim.lsp.buf.hover, { buffer = args.buf })
    vim.keymap.set("n", "<Leader>a", vim.lsp.buf.code_action, { buffer = args.buf })
    vim.keymap.set("n", "<M-f>", vim.lsp.buf.references, { buffer = args.buf })
    --vim.keymap.set("n", "", vim.lsp.buf.format, { buffer = args.buf })
    --vim.keymap.set("n", "", vim.lsp.buf.implementation, { buffer = args.buf })
  end,
})

-- Rust language server support
local rt = require("rust-tools")

-- https://github.com/simrat39/rust-tools.nvim#configuration
rt.setup({
  server = {
    on_attach = function(_, bufnr)
      -- Hover actions
      vim.keymap.set("n", "<C-space>", rt.hover_actions.hover_actions, { buffer = bufnr })
      -- Code action groups
      vim.keymap.set("n", "<Leader>a", rt.code_action_group.code_action_group, { buffer = bufnr })
    end,
  },
})

-- LSP Diagnostics Options Setup 
local sign = function(opts)
  vim.fn.sign_define(opts.name, {
    texthl = opts.name,
    text = opts.text,
    numhl = ''
  })
end

sign({name = 'DiagnosticSignError', text = '🔥'})
sign({name = 'DiagnosticSignWarn', text = '⚠️'})
sign({name = 'DiagnosticSignHint', text = '➡️'})
sign({name = 'DiagnosticSignInfo', text = '🗒️'})

vim.diagnostic.config({
    virtual_text = false,
    signs = true,
    update_in_insert = true,
    underline = true,
    severity_sort = false,
    float = {
        border = 'rounded',
        source = 'always',
        header = '',
        prefix = '',
    },
})

vim.cmd([[
set signcolumn=yes
autocmd CursorHold * lua vim.diagnostic.open_float(nil, { focusable = false })
]])

--Set completeopt to have a better completion experience
-- :help completeopt
-- menuone: popup even when there's only one match
-- noinsert: Do not insert text until a selection is made
-- noselect: Do not select, force to select one from the menu
-- shortness: avoid showing extra messages when using completion
-- updatetime: set updatetime for CursorHold
vim.opt.completeopt = {'menuone', 'noselect', 'noinsert'}
vim.opt.shortmess = vim.opt.shortmess + { c = true}
vim.api.nvim_set_option('updatetime', 300) 

-- Fixed column for diagnostics to appear
-- Show autodiagnostic popup on cursor hover_range
-- Goto previous / next diagnostic warning / error 
-- Show inlay_hints more frequently 
vim.cmd([[
set signcolumn=yes
autocmd CursorHold * lua vim.diagnostic.open_float(nil, { focusable = false })
]])

-- Completion Plugin Setup
local cmp = require'cmp'
cmp.setup({
  -- Enable LSP snippets
  snippet = {
    expand = function(args)
        vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ['<C-p>'] = cmp.mapping.select_prev_item(),
    ['<C-n>'] = cmp.mapping.select_next_item(),
    -- Add tab support
    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
    ['<Tab>'] = cmp.mapping.select_next_item(),
    ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-e>'] = cmp.mapping.close(),
    ['<CR>'] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = true,
    })
  },
  -- Installed sources:
  sources = {
    { name = 'path' },                              -- file paths
    { name = 'nvim_lsp', keyword_length = 3 },      -- from language server
    { name = 'nvim_lsp_signature_help'},            -- display function signatures with current parameter emphasized
    { name = 'nvim_lua', keyword_length = 2},       -- complete neovim's Lua runtime API such vim.lsp.*
    { name = 'buffer', keyword_length = 2 },        -- source current buffer
    { name = 'vsnip', keyword_length = 2 },         -- nvim-cmp source for vim-vsnip 
    { name = 'calc'},                               -- source for math calculation
  },
  window = {
      completion = cmp.config.window.bordered(),
      documentation = cmp.config.window.bordered(),
  },
  formatting = {
      fields = {'menu', 'abbr', 'kind'},
      format = function(entry, item)
          local menu_icon ={
              nvim_lsp = 'λ',
              vsnip = '⋗',
              buffer = 'Ω',
              path = '🖫',
          }
          item.menu = menu_icon[entry.source.name]
          return item
      end,
  },
})

-- Treesitter Plugin Setup 
require('nvim-treesitter.configs').setup {
  highlight = {
    enable = true,
    additional_vim_regex_highlighting=false,
  },
  ident = { enable = true }, 
  rainbow = {
    enable = true,
    extended_mode = true,
    max_file_lines = nil,
  }
}

vim.g.loaded_netrw = 1
vim.g.loaded_netrwPlugin = 1

-- set termguicolors to enable highlight groups
vim.opt.termguicolors = true

-- OR setup with some options
require("nvim-tree").setup({
  sort_by = "case_sensitive",
  view = {
    width = 30,
  },
  renderer = {
    group_empty = true,
  },
  --filters = {
  --  dotfiles = true,
  --},
})


vim.keymap.set("n", "<C-p>", function()
    require("nvim-tree.api").tree.toggle()
end)