Cosmic for Vim/Neovim

Vim-cosmic 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: Cosmic, which also includes color schemes for the terminals URxvt and XTerm.

Cosmic 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 comes with two modes: the dark mode, called Lunar (hue 222°), and the light one, called Solar (hue 55°).

Each mode has 3 contrasts:

• Very high contrast (HC), +4%
• high contrast (HC), +2%
• Medium contrast (MC), 0
• Low contrast (LC), -2%
• Very low contrast (LC), -4%

Installation

Manual installation

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

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

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

1. Paste this in your .vimrc file:

Plug 'gerardbm/vim-cosmic'

2. Reload your settings and install it:

:source $MYVIMRC
:PlugInstall

Modify your .vimrc

1. Set the colorscheme in your .vimrc configuration file:

syntax enable
colorscheme cosmic

Configuration

Color support

If your terminal does not support True color, you can take a look at the main Cosmic repository to see if Cosmic 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 cosmic).

---

1. See https://gist.github.com/XVilka/8346728 for a list of terminals that support True color.

2. 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 modes and contrast:

• (1) CosmicLunarC1: sets the lunar mode (dark background) in very high contrast (+4%).
• (2) CosmicLunarC2: sets the lunar mode (dark background) in high contrast (+2%).
• (3) CosmicLunarC3: sets the lunar mode (dark background) in medium contrast (default).
• (4) CosmicLunarC4: sets the lunar mode (dark background) in low contrast (-2%).
• (5) CosmicLunarC5: sets the lunar mode (dark background) in very contrast (-4%).
• (6) CosmicSolarC6: sets the solar mode (light background) in very high contrast (+4%).
• (7) CosmicSolarC7: sets the solar mode (light background) in high contrast (+2%).
• (8) CosmicSolarC8: sets the solar mode (light background) in medium contrast (default).
• (9) CosmicSolarC9: sets the solar mode (light background) in low contrast (-2%).
• (0) CosmicSolarC0: sets the solar mode (light background) in very low contrast (-4%).

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 CosmicSolarC8 between 8 am and 8 pm and switch to CosmicLunarC3 at night, simply paste this in your ~/.vimrc or ~/.gvimrc:

function! CosmicSwitcher()
	if (strftime('%H') > 8) && (strftime('%H') < 20)
		CosmicSolarC8
	else
		CosmicLunarC3
	endif
endfunction

Alternatively, you can cycle them (from 0 to 9) with a shortcut (for example: Shift+F9). Paste this in your ~/.vimrc or ~/.gvimrc:

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

Emphasis

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

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

let g:cosmic_italic = 0
let g:cosmic_bold = 0
let g:cosmic_underline = 0
let g:cosmic_undercurl = 0

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

MatchParen highlight

By default, Cosmic 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:cosmic_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:cosmic_italic = 0
colorscheme cosmic
CosmicLunarC5