moonfly is a dark color scheme for Vim and Neovim that has taken inspiration from:

• sunburst
• xoria256
• One Dark
• One
• monokai

Be aware, the moonfly color scheme does incrementally change from time to time, primarily with regard to language and plugin theming. However, the core color palette will not change; except the time I changed crimson (July 2017) and violet (January 2020), sorry.

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

Normal	Color	Bright	Color
Background		Foreground
Grey		Coral
Red		Crimson
Green		Emerald
Yellow		Wheat
Blue		Sky
Violet		Purple
Turquoise		Lime
Orange		Cranberry

The font in use is Iosevka.

• C/C++
• Clojure
• CoffeeScript
• Crystal
• Elixir
• Elm
• Dart
• Go
• Haskell
• Java
• JavaScript
• Lua
• Markdown
• PHP
• PureScript
• Python
• Ruby
• Rust
• Scala
• Shell
• TypeScript

• NERDTree
• ALE
• Neomake
• GitGutter
• fzf.vim
• CtrlP
• BufExplorer
• clever-f
• Tagbar
• indentLine (please set let g:indentLine_setColors = 0 in your vimrc)

Use your favoured plugin manager to install bluz71/vim-moonfly-colors then set the colorscheme in your vimrc file.

If using vim-plug do the following:

1. Add Plug 'bluz71/vim-moonfly-colors' to your vimrc
2. Run :PlugInstall
3. Add colorscheme moonfly to your vimrc, make sure this line appears after the Plug declaration.

The moonfly color scheme supports lightline.vim. To enable the moonfly lightline colorscheme, after the lightline.vim plugin has been installed, please add the following to your vimrc:

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

The moonfly color scheme also supports vim-airline. With modern versions of vim-airline the moonfly theme will be automatically loaded.

Alternatively, vim-moonfly-statusline, is available for those that just want a simple yet informative moonfly themed status line.

The g:moonflyCursorColor 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 vimrc:

let g:moonflyCursorColor = 1

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

let g:moonflyTerminalColors = 0

The g:moonflyUnderlineMatchParen 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 vimrc:

let g:moonflyUnderlineMatchParen = 1

The g:moonflyUndercurls 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 vimrc:

let g:moonflyUndercurls = 0

The g:moonflyItalics option specifies whether to use italics for comments and certain html elements 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 italics then add the following to your vimrc:

let g:moonflyItalics = 0

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

A list of common terminals that support true colors:

• iTerm2
• GNOME Terminal
• Windows Terminal
• alacritty
• kitty
• konsole
• PuTTY
• mintty

💣 Terminal.app on macOS and xterm on Unix do not support true colors.

On terminals that support true colors, and when termguicolors is set, the moonfly color scheme will not require any terminal configuration to emit the correct moonfly colors.

For the true color moonfly color scheme to display correctly inside tmux the following setting will be required in ~/.tmux.conf:

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

Vim, as against Neovim, inside tmux, will also require the following setting be added to vimrc:

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

Repeating, the above t_8* settings are not required for Neovim.

If consistency between Vim colors and $SHELL colors is important then I recommend proceeding with the 256-color configurations listed in the next section.

The moonfly color scheme, when used with Vim absent termguicolors, requires the host terminal be configured with a specific color palette.

Firstly, the terminal emulator must be configured for 256 colors, which usually means setting the terminal's type to xterm-256color or screen-256color when used inside tmux.

The terminal can now be configured with the following moonfly colors:

Type	Category	Value	Color
Background	Background	080808
Foreground	Foreground	b2b2b2
Bold	Bold	eeeeee
Cursor	Cursor	9e9e9e
Cursor Text	Cursor Text	080808
Highlight	Highlight	b2ceee
Highlight Text	Highlight Text	080808
Color 1	Black (normal)	373c40
Color 2	Red (normal)	ff5454
Color 3	Green (normal)	8cc85f
Color 4	Yellow (normal)	e3c78a
Color 5	Blue (normal)	80a0ff
Color 6	Purple (normal)	d183e8
Color 7	Cyan (normal)	7ee0ce
Color 8	White (normal)	de935f
Color 9	Black (bright)	f09479
Color 10	Red (bright)	f74782
Color 11	Green (bright)	42cf89
Color 12	Yellow (bright)	cfcfb0
Color 13	Blue (bright)	78c2ff
Color 14	Purple (bright)	ae81ff
Color 15	Cyan (bright)	85dc85
Color 16	White (bright)	e2637f

iterm2 users on macOS can import this color scheme.

Gnome Terminal users can run this script to create a Moonfly profile. Before executing the script, please install the dconf-cli command line utility for modern versions of Gnome (3.28 and later), for example sudo apt install dconf-cli. After executing the script, please set the cursor and highlight colors by hand, with the appropriate color values listed above, in Preferences / Moonfly / Colors.

kitty users can use this theme.

xterm users on Linux can add the following snippet to their ~/.Xresources file and launch xterm with xterm -name xterm-moonfly:

xterm-moonfly*background:  #080808
xterm-moonfly*foreground:  #b2b2b2
xterm-moonfly*cursorColor: #9e9e9e
xterm-moonfly*colorBD:     #eeeeee
xterm-moonfly*color0:      #373c40
xterm-moonfly*color1:      #ff5454
xterm-moonfly*color2:      #8cc85f
xterm-moonfly*color3:      #e3c78a
xterm-moonfly*color4:      #80a0ff
xterm-moonfly*color5:      #d183e8
xterm-moonfly*color6:      #7ee0ce
xterm-moonfly*color7:      #de935f
xterm-moonfly*color8:      #f09479
xterm-moonfly*color9:      #f74782
xterm-moonfly*color10:     #42cf89
xterm-moonfly*color11:     #cfcfb0
xterm-moonfly*color12:     #78c2ff
xterm-moonfly*color13:     #ae81ff
xterm-moonfly*color14:     #85dc85
xterm-moonfly*color15:     #e2637f

A complete Xresources file is available here.

Historically, when relativenumber was set whilst cursorline was not set, Vim would automatically highlight the cursor line in the number column with the CursorLineNR highlight group. However, newer versions of Vim no longer do that by default unless cursorline is set and the new cursorlineopt option is also set accordingly.

At the same time I also like disabling relativenumber for inactive windows.

To achieve all that please add something similar to the following to your vimrc:

set relativenumber
if exists('&cursorlineopt')
    set cursorlineopt=number
    set cursorline
endif

function! RelativeNumberActivity(mode)
    if &diff
        " For diffs, do nothing since we want relativenumbers in all windows.
        return
    endif
    if &buftype == "nofile" || &buftype == "nowrite"
        setlocal nonumber
    elseif a:mode == "active"
        setlocal relativenumber
        if exists('&cursorlineopt')
            setlocal cursorline
        endif
    else
        setlocal norelativenumber
        if exists('&cursorlineopt')
            setlocal nocursorline
        endif
    endif
endfunction

augroup CustomWindowActivity
    autocmd!
    autocmd WinEnter * call RelativeNumberActivity("active")
    autocmd WinLeave * call RelativeNumberActivity("inactive")
    if exists('&cursorlineopt')
        autocmd FileType nerdtree setlocal cursorlineopt=both
    endif
augroup END

Feel free to change, or ignore, per your needs.

MIT