nightfly is a dark midnight theme for modern Neovim and classic Vim.

Note, all nightfly highlights in Neovim are implemented in Lua, whilst highlights in Vim are implemented in legacy Vimscript.

👉 I maintain another dark theme named moonfly which may be of interest.

Neovim-only:

• Neovim Tree-sitter
• Neovim Diagnostic
• Neovim LSP Semantic Highlights
• Barbar
• Dashboard
• fzf.lua
• Gitsigns
• Hop
• Indent BlankLine
• Lazy
• lspsaga.nvim
• Lualine
• mason.nvim
• Mini
• Neo-tree
• Neogit
• Noice
• nvim-cmp
• nvim-dap-ui
• nvim-navic
• nvim-notify
• nvim-treesitter-context
• NvCheatsheet.nvim
• NvimTree
• Rainbow Delimiters
• Telescope

Neovim & Vim compatible:

• BufExplorer
• clever-f
• Coc.nvim
• CtrlP
• Fern
• fzf.vim (works best with matching fly16 bat theme)
• lightline
• Tagbar
• vim-airline

Vim-only:

• ALE
• GitGutter
• indentLine
• NERDTree
• Signify

nightfly is a GUI-only colorscheme.

A GUI client or a modern terminal version of Vim or Neovim in a true-color terminal is required. Details about true-color terminals are listed here.

Install the bluz71/vim-nightfly-colors colorscheme with your preferred plugin manager.

lazy.nvim:

{ "bluz71/vim-nightfly-colors", name = "nightfly", lazy = false, priority = 1000 },

vim-plug:

Plug 'bluz71/vim-nightfly-colors', { 'as': 'nightfly' }

Enable the colorscheme after the plugin declaration.

" Vimscript initialization file
colorscheme nightfly

-- Lua initialization file
vim.cmd [[colorscheme nightfly]]

• The nightfly theme supports lightline. To enable the nightfly lightline theme please add the following to your initialization file:

let g:lightline = { 'colorscheme': 'nightfly' }

• The nightfly theme supports vim-airline. The nightfly theme will load once vim-airline starts.

• The nightfly theme supports Lualine. The nightfly theme will automatically load once Lualine starts.

• My linefly statusline plugin supports the nightfly theme.

• Lastly, my legacy mistfly-statusline plugin also supports the nightfly theme.

The nightflyCursorColor option specifies whether to color the cursor or not. By default the cursor will NOT be colored. If you prefer a colored cursor then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyCursorColor = v:true

-- Lua initialization file
vim.g.nightflyCursorColor = true

The nightflyItalics option specifies whether to use italics for comments and certain HTML elements in GUI versions of Vim. By default this option is enabled. If you do not like the appearance of italics then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyItalics = v:false

-- Lua initialization file
vim.g.nightflyItalics = false

The nightflyNormalFloat option specifies whether to use nightfly background and foreground colors in Neovim floating windows. By default this option is disabled, hence, Neovim floating windows will usually be styled with popup menu colors. If you would like to use nightfly colors instead then add the following to your configuration:

" Vimscript initialization file
let g:nightflyNormalFloat = v:true

-- Lua initialization file
vim.g.nightflyNormalFloat = true

💡 If the above option is set then it is highly recommended to enable floating window borders to distinguish between the edit and floating windows in Neovim's LSP client, for example:

  vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(
    vim.lsp.handlers.hover, {
      border = "single"
    }
  )
  vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(
    vim.lsp.handlers.signatureHelp, {
      border = "single"
    }
  )
  vim.diagnostic.config({ float = { border = "single" } })

💡 Likewise, nvim-cmp may be configured as follows for nicer display when g:nightflyNormalFloat is enabled:

local winhighlight = {
  winhighlight = "Normal:NormalFloat,FloatBorder:FloatBorder,CursorLine:PmenuSel",
}
require('cmp').setup({
  window = {
    completion = cmp.config.window.bordered(winhighlight),
    documentation = cmp.config.window.bordered(winhighlight),
  }
})

The nightflyTerminalColors option specifies whether to use the nightfly color palette in :terminal windows when termguicolors is set. By default this option is enabled. If you prefer not to use the nightfly color palette for the first 16 terminal colors then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyTerminalColors = v:false

-- Lua initialization file
vim.g.nightflyTerminalColors = false

The nightflyTransparent option specifies whether to use an opaque or transparent background in GUI versions of Vim. By default this option is disabled. If you would like a transparent background then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyTransparent = v:true

-- Lua initialization file
vim.g.nightflyTransparent = true

The nightflyUndercurls option specifies whether to use undercurls for spelling and linting errors in GUI versions of Vim, including terminal Vim with termguicolors set. By default this option is enabled. If you do not like the appearance of undercurls then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyUndercurls = v:false

-- Lua initialization file
vim.g.nightflyUndercurls = false

The nightflyUnderlineMatchParen option specifies whether to underline matching parentheses. By default this option is disabled. If you want to underline matching parentheses then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyUnderlineMatchParen = v:true

-- Lua initialization file
vim.g.nightflyUnderlineMatchParen = true

The nightflyVirtualTextColor option specifies whether to display diagnostic virtual text in color. By default this option is disabled. If you want to display diagnostic virtual text in color then add the following to your initialization file:

" Vimscript initialization file
let g:nightflyVirtualTextColor = v:true

-- Lua initialization file
vim.g.nightflyVirtualTextColor = true

The nightflyWinSeparator option specifies the style of window separators:

• 0 will display no window separators

• 1 will display block separators; this is the default

• 2 will diplay line separators

For example, if line separators are desired then add the following to your configuration:

" Vimscript initialization file
let g:nightflyWinSeparator = 2

-- Lua initialization file
vim.g.nightflyWinSeparator = 2

🎁 If using Neovim 0.7 (or later), the following configuration will improve the look of line separators (if option 2 has been chosen) by selecting thicker characters for the separators:

" Vimscript initialization file
set fillchars=horiz:━,horizup:┻,horizdown:┳,vert:┃,vertleft:┨,vertright:┣,verthoriz:╋

-- Lua initialization file
vim.opt.fillchars = { horiz = '━', horizup = '┻', horizdown = '┳', vert = '┃', vertleft = '┫', vertright = '┣', verthoriz = '╋', }

If a certain highlight of this theme does not suit then it is recommended to use an autocmd to override that desired highlight.

For example, if one wishes to highlight functions in bold then simply add the following to your initialization file prior to setting the colorscheme:

" Vimscript initialization file
augroup CustomHighlight
    autocmd!
    autocmd ColorScheme nightfly highlight Function guifg=#82aaff gui=bold
augroup END

-- Lua initialization file
local custom_highlight = vim.api.nvim_create_augroup("CustomHighlight", {})
vim.api.nvim_create_autocmd("ColorScheme", {
  pattern = "nightfly",
  callback = function()
    vim.api.nvim_set_hl(0, "Function", { fg = "#82aaff", bold = true })
  end,
  group = custom_highlight,
})

The palette field returns a table of internal theme colors; useful for constructing custom statuslines and the like.

require("nightfly").palette

Meanwhile the custom_colors function allows customization of individual theme colors. This needs to occur prior to invoking the colorscheme. The full list of available colors is provided by the palette field.

  require("nightfly").custom_colors({
    bg = "#161616",
    violet = "#ff74b8",
  })
  vim.cmd([[colorscheme nightfly]])

Many modern terminals support 24-bit true colors. Current versions of Vim & Neovim on such terminals support true colors when set termguicolors is enabled.

On terminals that support true colors, and when termguicolors is set, the nightfly colorscheme will emit the correct theme colors.

For the nightfly colorscheme to display correctly inside tmux the following setting will usually be required in ~/.tmux.conf:

set -ga terminal-overrides ',xterm-256color:Tc'

Vim, as against Neovim, inside tmux, will also require the following settings be added to the ~/.vimrc file:

let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"

A collection of nightfly-flavoured extra themes:

Type	Category	Value	Color
Background	Background	#011627
Foreground	Foreground	#bdc1c6
Bold	Bold	#eeeeee
Cursor	Cursor	#9ca1aa
Cursor Text	Cursor Text	#080808
Selection	Selection	#b2ceee
Selection Text	Selection Text	#080808
Color 1	Black (normal)	#1d3b53
Color 2	Red (normal)	#fc514e
Color 3	Green (normal)	#a1cd5e
Color 4	Yellow (normal)	#e3d18a
Color 5	Blue (normal)	#82aaff
Color 6	Purple (normal)	#c792ea
Color 7	Cyan (normal)	#7fdbca
Color 8	White (normal)	#a1aab8
Color 9	Black (bright)	#7c8f8f
Color 10	Red (bright)	#ff5874
Color 11	Green (bright)	#21c7a8
Color 12	Yellow (bright)	#ecc48d
Color 13	Blue (bright)	#82aaff
Color 14	Purple (bright)	#ae81ff
Color 15	Cyan (bright)	#7fdbca
Color 16	White (bright)	#d6deeb