nix-config/home/nvim/lua/init.lua

-------------------------------------------------------------------------------
-- Options {{{1 ---------------------------------------------------------------
-------------------------------------------------------------------------------
vim.opt.autoindent     = true                              -- maintain indent of current line
vim.opt.backup         = false                             -- don't make backups before writing
vim.opt.belloff        = 'all'                             -- never ring the bell for any reason
vim.opt.breakindent    = true
vim.opt.completeopt    = 'menuone'                         -- show menu even if there is only one candidate (for nvim-compe)
vim.opt.completeopt    = vim.opt.completeopt + 'noselect'  -- don't automatically select canditate (for nvim-compe)
vim.opt.cursorline     = true                              -- highlight current line
vim.opt.expandtab      = true                              -- always use spaces instead of tabs
vim.opt.fillchars      = {
  diff                 = '∙',                              -- BULLET OPERATOR (U+2219, UTF-8: E2 88 99)
  eob                  = ' ',                              -- NO-BREAK SPACE (U+00A0, UTF-8: C2 A0) to suppress ~ at EndOfBuffer
  vert                 = '┃',                              -- BOX DRAWINGS HEAVY VERTICAL (U+2503, UTF-8: E2 94 83)
}
vim.opt.hlsearch       = true
vim.opt.ignorecase     = true
vim.opt.incsearch      = true
vim.opt.mouse          = 'a'                    -- enable mouse
vim.opt.shiftwidth     = 2
vim.opt.showcmd        = true
vim.opt.smartcase      = true
vim.opt.tabstop        = 2
vim.opt.wildmenu       = true

vim.opt.modelines      = 5                      -- scan this many lines looking for modeline
vim.opt.number         = true                   -- show line numbers in gutter
vim.opt.pumblend       = 10                     -- pseudo-transparency for popup-menu
vim.opt.relativenumber = true                   -- show relative numbers in gutter
vim.opt.scrolloff      = 3                      -- start scrolling 3 lines before edge of viewport

vim.opt.spellcapcheck = ''                      -- don't check for capital letters at start of sentence
vim.opt.splitbelow    = true                    -- open horizontal splits below current window
vim.opt.splitright    = true                    -- open vertical splits to the right of the current window
vim.opt.suffixes      = vim.opt.suffixes - '.h' -- don't sort header files at lower priority
vim.opt.swapfile      = false                   -- don't create swap files
vim.opt.switchbuf     = 'usetab'                -- try to reuse windows/tabs when switching buffers
vim.opt.synmaxcol     = 200                     -- don't bother syntax highlighting long lines
vim.opt.tabstop       = 2                       -- spaces per tab
vim.opt.termguicolors = true                    -- use guifg/guibg instead of ctermfg/ctermbg in terminal
vim.opt.textwidth     = 80                      -- automatically hard wrap at 80 columns

vim.opt.shell         = 'bash'                  -- shell to use for `!`, `:!`, `system()` etc.
vim.opt.shiftround    = false                   -- don't always indent by multiple of shiftwidth
vim.opt.shiftwidth    = 2                       -- spaces per tab (when shifting)
vim.opt.shortmess     = vim.opt.shortmess + 'A' -- ignore annoying swapfile messages
vim.opt.shortmess     = vim.opt.shortmess + 'I' -- no splash screen
vim.opt.shortmess     = vim.opt.shortmess + 'O' -- file-read message overwrites previous
vim.opt.shortmess     = vim.opt.shortmess + 'T' -- truncate non-file messages in middle
vim.opt.shortmess     = vim.opt.shortmess + 'W' -- don't echo "[w]"/"[written]" when writing
vim.opt.shortmess     = vim.opt.shortmess + 'a' -- use abbreviations in messages eg. `[RO]` instead of `[readonly]`
vim.opt.shortmess     = vim.opt.shortmess + 'c' -- completion messages
vim.opt.shortmess     = vim.opt.shortmess + 'o' -- overwrite file-written messages
vim.opt.shortmess     = vim.opt.shortmess + 't' -- truncate file messages at start
vim.opt.showbreak     = '↳ '                    -- DOWNWARDS ARROW WITH TIP RIGHTWARDS (U+21B3, UTF-8: E2 86 B3)
vim.opt.showcmd       = false                   -- don't show extra info at end of command line
vim.opt.sidescroll    = 0                       -- sidescroll in jumps because terminals are slow
vim.opt.sidescrolloff = 3                       -- same as scrolloff, but for columns
vim.opt.smarttab      = true                    -- <tab>/<BS> indent/dedent in leading whitespace

-- Custom Commands
vim.cmd[[command! JsonFormat execute "::%!jq '.'"]]

-- Tab shortcuts
vim.api.nvim_set_keymap("n", "<C-n>", "<cmd>tabnew<cr>",
  {noremap = true}
)

-- copy to OS clipboard
vim.api.nvim_set_keymap("v", "<leader>y", "\"+y",
  {noremap = true}
)

-- NvimTreeToggle
vim.api.nvim_set_keymap("n", "<leader>n", "<cmd>NvimTreeToggle<cr>",
  {noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>r", "<cmd>NvimTreeRefresh<cr>",
  {noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>nf", "<cmd>NvimTreeFindFile<cr>",
  {noremap = true}
)

-- Folding
vim.api.nvim_set_keymap("n", "<space>", "za",
  {silent = true, noremap = true}
)

--Set colorscheme
vim.o.termguicolors = true
vim.cmd[[colorscheme tokyonight]]
vim.g.tokyonight_style = "night"
vim.g.tokyonight_italic_functions = true

-------------------------------------------------------------------------------
-- LSP {{{1 -------------------------------------------------------------------
-------------------------------------------------------------------------------
require'lspconfig'.bashls.setup{}
require'lspconfig'.gopls.setup{}
require'lspconfig'.pyright.setup{}
require'lspconfig'.rls.setup{}
require'lspconfig'.rnix.setup{}
require'lspconfig'.solargraph.setup{}
require'lspconfig'.terraformls.setup{}
require'lspconfig'.tflint.setup{}
require'lspconfig'.yamlls.setup{}


-------------------------------------------------------------------------------
-- Plugins {{{1 ---------------------------------------------------------------
-------------------------------------------------------------------------------
-- status line
require('lualine').setup {
  options = {
    theme = 'tokyonight'
  }
}

-- treesitter
require('nvim-treesitter.configs').setup({
    ensure_installed = "all",

    highlight = {
        enable = true,
        custom_captures = {
            -- ["<capture group>"] = "<highlight group>",
            -- ["keyword"] = "TSString",
        },
    },

    indent = {
        enable = true
    },

    rainbow = {
      enable = true,
      extended_mode = true
    },
})

-- folding
vim.api.nvim_exec([[
    set foldmethod=expr
    set foldlevel=20
    set nofoldenable
    set foldexpr=nvim_treesitter#foldexpr()
]], true)

-- trouble
require("trouble").setup {
  {
    position = "bottom", -- position of the list can be: bottom, top, left, right
    height = 10, -- height of the trouble list when position is top or bottom
    width = 50, -- width of the list when position is left or right
    icons = true, -- use devicons for filenames
    mode = "lsp_workspace_diagnostics", -- "lsp_workspace_diagnostics", "lsp_document_diagnostics", "quickfix", "lsp_references", "loclist"
    fold_open = "", -- icon used for open folds
    fold_closed = "", -- icon used for closed folds
    action_keys = { -- key mappings for actions in the trouble list
        -- map to {} to remove a mapping, for example:
        -- close = {},
        close = "q", -- close the list
        cancel = "<esc>", -- cancel the preview and get back to your last window / buffer / cursor
        refresh = "r", -- manually refresh
        jump = {"<cr>", "<tab>"}, -- jump to the diagnostic or open / close folds
        open_split = { "<c-x>" }, -- open buffer in new split
        open_vsplit = { "<c-v>" }, -- open buffer in new vsplit
        open_tab = { "<c-t>" }, -- open buffer in new tab
        jump_close = {"o"}, -- jump to the diagnostic and close the list
        toggle_mode = "m", -- toggle between "workspace" and "document" diagnostics mode
        toggle_preview = "P", -- toggle auto_preview
        hover = "K", -- opens a small popup with the full multiline message
        preview = "p", -- preview the diagnostic location
        close_folds = {"zM", "zm"}, -- close all folds
        open_folds = {"zR", "zr"}, -- open all folds
        toggle_fold = {"zA", "za"}, -- toggle fold of current file
        previous = "k", -- preview item
        next = "j" -- next item
    },
    indent_lines = true, -- add an indent guide below the fold icons
    auto_open = false, -- automatically open the list when you have diagnostics
    auto_close = false, -- automatically close the list when you have no diagnostics
    auto_preview = true, -- automatically preview the location of the diagnostic. <esc> to close preview and go back to last window
    auto_fold = false, -- automatically fold a file trouble list at creation
    signs = {
    -- icons / text used for a diagnostic
      error = "",
      warning = "",
      hint = "",
      information = "",
      other = "﫠"
    },
    use_lsp_diagnostic_signs = false -- enabling this will use the signs defined in your lsp client
  }
}
vim.api.nvim_set_keymap("n", "<leader>xx", "<cmd>Trouble<cr>",
  {silent = true, noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>xw", "<cmd>Trouble lsp_workspace_diagnostics<cr>",
  {silent = true, noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>xd", "<cmd>Trouble lsp_document_diagnostics<cr>",
  {silent = true, noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>xl", "<cmd>Trouble loclist<cr>",
  {silent = true, noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>xq", "<cmd>Trouble quickfix<cr>",
  {silent = true, noremap = true}
)
vim.api.nvim_set_keymap("n", "gR", "<cmd>Trouble lsp_references<cr>",
  {silent = true, noremap = true}
)

-- twilight
require("twilight").setup {
  dimming = {
    alpha = 0.25, -- amount of dimming
    -- we try to get the foreground from the highlight groups or fallback color
    color = { "Normal", "#cccccc" },
  },
  context = 10, -- amount of lines we will try to show around the current line
  expand = { -- for treesitter, we we always try to expand to the top-most ancestor with these types
    "function",
    "method",
    "table",
    "if_statement",
  },
  exclude = {}, -- exclude these filetypes
}

-- vim-go
vim.g.go_auto_sameids = 0
vim.g.go_fmt_command = "goimports"
vim.g.go_fmt_experimental = 1
vim.g.go_highlight_array_whitespace_error = 1
vim.g.go_highlight_build_constraints = 1
vim.g.go_highlight_chan_whitespace_error = 1
vim.g.go_highlight_extra_types = 1
vim.g.go_highlight_fields = 1
vim.g.go_highlight_format_strings = 1
vim.g.go_highlight_function_calls = 1
vim.g.go_highlight_function_parameters = 1
vim.g.go_highlight_functions = 1
vim.g.go_highlight_generate_tags = 1
vim.g.go_highlight_operators = 1
vim.g.go_highlight_space_tab_error = 1
vim.g.go_highlight_string_spellcheck = 1
vim.g.go_highlight_trailing_whitespace_error = 0
vim.g.go_highlight_types = 1
vim.g.go_highlight_variable_assignments = 1
vim.g.go_highlight_variable_declarations = 1
vim.g.go_rename_command = 'gopls'
vim.g.go_metalinter_autosave = 1
vim.g.go_metalinter_autosave_enabled = {'golint', 'govet'}

-- vim-terraform
vim.g.terraform_align = 1
vim.g.terraform_fmt_on_save = 1
vim.g.terraform_fold_sections = 1

-- rust.vim
vim.g.rustfmt_autosave = 1

-- vim-markdown
vim.g.vim_markdown_override_foldtext = 0
vim.g.vim_markdown_no_default_key_mappings = 1
vim.g.vim_markdown_emphasis_multiline = 0
vim.g.vim_markdown_conceal = 0
vim.g.vim_markdown_frontmatter = 1
vim.g.vim_markdown_new_list_item_indent = 0

-- vim-prettier
vim.g['prettier#autoformat'] = 1

-- git-blame
vim.g.gitblame_enabled = 0

-- telescope
vim.api.nvim_set_keymap("n", "<leader>ff", "<cmd>Telescope find_files<cr>",
  {silent = true, noremap = true}
)
vim.api.nvim_set_keymap("n", "<leader>fg", "<cmd>Telescope live_grep<cr>",
  {silent = true, noremap = true}
)

-- syntastic
vim.g.syntastic_always_populate_loc_list = 1
vim.g.syntastic_auto_loc_list = 1
vim.g.syntastic_check_on_open = 1
vim.g.syntastic_check_on_wq = 0

-- completion-nvim
vim.cmd[[autocmd BufEnter * lua require'completion'.on_attach()]]

-- use tab as trigger keys
vim.cmd[[imap <tab> <Plug>(completion_smart_tab)]]
vim.cmd[[imap <s-tab> <Plug>(completion_smart_s_tab)]]

-- Use <Tab> and <S-Tab> to navigate through popup menu
-- vim.cmd[[inoremap <expr> <Tab>   pumvisible() ? "\<C-n>" : "\<Tab>"]]
-- vim.cmd[[inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"]]

-- Remember line number
vim.cmd[[au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$") | exe "normal! g`\"" | endif]]

--Replace visually selected
vim.cmd[[vnoremap <C-r> "hy:%s/<C-r>h//g<left><left>]]

-- Indent YAML
vim.cmd[[au FileType yaml setlocal ts=2 sts=2 sw=2 expandtab]]

-- Python indentation
vim.cmd[[au BufNewFile,BufRead *.py set tabstop=4 softtabstop=4 shiftwidth=4 textwidth=79 expandtab autoindent fileformat=unix]]

-- Highlight whitespace
vim.cmd[[highlight ExtraWhitespace ctermbg=red guibg=red]]
vim.cmd[[match ExtraWhitespace /\s\+$/]]