Atomic for Vim/Neovim

Vim-atomic is a dark & light color scheme designed to use on vim, gvim and neovim. It consists of 16 colors selected procedurally (algorithms) and it's part of a bigger project: Atomic, which also includes themes and color schemes for terminals (URxvt, XTerm) and some terminal programs (tmux, zsh, irssi, cmus).

Atomic has support for 8, 16 and 256 colors, and True Color (24 bits) on the last versions of vim, gvim, neovim and nvim-qt. It uses the setting termguicolors properly (some color schemes don't).

It also includes 7 modes of color (6 darks and 1 light):

Space mode is dark with blue hue (240°).
Onion mode is dark with purple hue (300°).
Blood mode is dark with red hue (0°).
Night mode is dark with orange hue (60°).
Grass mode is dark with green hue (120°).
Ocean mode is dark with cyan hue (180°).
Light mode is light with orange hue (60°).

Each mode has 3 contrasts:

High contrast (HC), +3%
Medium contrast (MC), 0
Low contrast (LC), -3%

Installation

Manual installation

Copy the file atomic.vim to your ~/.vim/colors/ directory (for vim) or ~/.config/nvim/colors/ directory (for neovim).

$ cd vim-atomic
$ cp atomic.vim ~/.vim/colors/

Using a plugin manager (i.e., vim-plug)

Paste this in your .vimrc file:

Plug 'gerardbm/vim-atomic'

Reload your settings and install it:

:source $MYVIMRC
:PlugInstall

Modify your .vimrc

Set the colorscheme in your .vimrc configuration file:

syntax enable
colorscheme atomic

Configuration

Color support

If your terminal does not support True color, you can take a look at the main Atomic repository to see if Atomic colors are available for your terminal and how to install them.

If your terminal supports True color (1), you can enable it configuring your ~/.vimrc file with the setting set termguicolors (2) before the color scheme definition (colorscheme atomic).

See https://gist.github.com/XVilka/8346728 for a list of terminals that support True color.
Sometimes setting termguicolors is not enough and one has to set the t_8f and t_8b options explicitly, also before the color scheme definition:

if has("termguicolors")
	let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
	let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
	set termguicolors
endif

Use it when $TERM is not xterm, for example, running vim into tmux or using a terminal with different $TERM, like st case.

More info, see :h xterm-true-color.

Color palettes

If your terminal have True color support or if you are using a GUI (like gvim or nvim-qt), you have the following commands to switch between the different color palettes:

(1) AtomicSpaceHC: sets the space mode (blue hue, dark background) in hard contrast (+3%).
(2) AtomicSpaceMC: sets the space mode (blue hue, dark background) in medium contrast (default).
(3) AtomicSpaceLC: sets the space mode (blue hue, dark background) in hard contrast (-3%).
(4) AtomicOnionHC: sets the onion mode (purple hue, dark background) in hard contrast (+3%).
(5) AtomicOnionMC: sets the onion mode (purple hue, dark background) in medium contrast (default).
(6) AtomicOnionLC: sets the onion mode (purple hue, dark background) in hard contrast (-3%).
(7) AtomicBloodHC: sets the blood mode (red hue, dark background) in hard contrast (+3%).
(8) AtomicBloodMC: sets the blood mode (red hue, dark background) in medium contrast (default).
(9) AtomicBloodLC: sets the blood mode (red hue, dark background) in hard contrast (-3%).
(10) AtomicNightHC: sets the night mode (orange hue, dark background) in hard contrast (+3%).
(11) AtomicNightMC: sets the night mode (orange hue, dark background) in medium contrast (default).
(12) AtomicNightLC: sets the night mode (orange hue, dark background) in hard contrast (-3%).
(13) AtomicGrassHC: sets the grass mode (green hue, dark background) in hard contrast (+3%).
(14) AtomicGrassMC: sets the grass mode (green hue, dark background) in medium contrast (default).
(15) AtomicGrassLC: sets the grass mode (green hue, dark background) in hard contrast (-3%).
(16) AtomicOceanHC: sets the ocean mode (cyan hue, dark background) in hard contrast (+3%).
(17) AtomicOceanMC: sets the ocean mode (cyan hue, dark background) in medium contrast (default).
(18) AtomicOceanLC: sets the ocean mode (cyan hue, dark background) in hard contrast (-3%).
(19) AtomicLightHC: sets the light mode (orange hue, light background) in hard contrast (+3%).
(20) AtomicLightMC: sets the light mode (orange hue, light background) in medium contrast (default).
(21) AtomicLightLC: sets the light mode (orange hue, light background) in hard contrast (-3%).

Use one of them after the color scheme definition in your ~/.vimrc or ~/.gvimrc.

Switch them automatically depending on the current time. For example, if you would like to use the AtomicLightHC between 8 am and 8 pm and switch to AtomicNightHC at night, simply paste this in your ~/.vimrc or ~/.gvimrc:

function! AtomicSwitcher()
	if (strftime('%H') > 8) && (strftime('%H') < 20)
		AtomicLightHC
	else
		AtomicNightHC
	endif
endfunction

Alternatively, you can cycle them (from 1 to 21) with a shortcut (for example: Shift+F9). Paste this in your ~/.vimrc or ~/.gvimrc:

nnoremap <S-F9> :call CycleModes()<CR>:colorscheme atomic<CR>

Emphasis

Some terminals don't handle italics correctly, so in case you need to disable italics set let g:atomic_italic=0 in your ~/.vimrc, before the color scheme definition.

Full list of options to disable italic text, bold, underline and undercurl:

let g:atomic_italic = 0
let g:atomic_bold = 0
let g:atomic_underline = 0
let g:atomic_undercurl = 0

If this options are not defined, default value is 1 for all of them.

MatchParen highlight

By default, Atomic will use an orange color to highlight the background for MatchParen. To use the orange color for the foreground instead, use the following option:

let g:atomic_matchparen = 0

As with emphasis cases, add this to your ~/.vimrc, before the color scheme definition.

Example configuration

if has("termguicolors")
	let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
	let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
	set termguicolors
endif

syntax enable

let g:atomic_italic = 0
colorscheme atomic
AtomicNightMC