Light and dark vim colorscheme, shamelessly stolen from atom (another excellent text editor). One supports true colors and falls back gracefully and automatically if your environment does not support this feature.

Everything You Should Know about This Fork

It seems rakr stopped maintaining the original repo and there's been no response for the pull requests since March 2018, although he still uses GitHub once in a while from what we know about the contribution graph. Although rakr failed to resolve a merge conflict, my optimization fix was added manually at last.

The original repo lacks maintenance. The author checks PRs about once a season? And the accepted PRs even introduced bugs, which let me suspect if there's any code review being done. I'll just stop opening pr to it and keep updates in my own fork.

Changes made on this fork

• reduce theme loading time from 170 ms to 18 ms by
  • hard coding the 256 color, see pr_93
  • reusing highlight definitions with predefined groups (hi link)
• color palette customization support

	loading time
original	170.621 ms
hard coding the 256 color	33.659 ms
reusing defs with hi link	18.253 ms
custom syntax_bg only	20.232 ms

Color Palette Customization

This feature is not designed to change the whole color palette of vim-one. The language specific highlights are based on the default vim-one color palette. Redefining a completely different palette may result in ugly highlights.

Usage

For example, we can change the background color by defining global variable

let g:one_light_syntax_bg='#123456'
# or
let g:one_dark_syntax_bg='#123456'

All available color palette keywords are as follows,

• mono_1, mono_2, mono_3, mono_4
• hue_1, hue_2, hue_3, hue_4, hue_5, hue_5_2, hue_6, hue_6_2
• syntax_bg, syntax_gutter, syntax_cursor, syntax_accent, syntax_accent_2
• vertsplit, special_grey, visual_grey, pmenu
• syntax_fg, syntax_fold_bg

Prefix these keywords with one_dark_ for dark color scheme and one_light_ for the light. Browse the source code for more detail.

Vim Airline theme

Add the following line to your ~/.vimrc or ~/.config/nvim/init.vim

let g:airline_theme='one'

As for the colorscheme, this theme comes with light and dark flavors.

List of enhanced language support

Pull requests are more than welcome here. I have created few issues to provide a bare bone roadmap for this color scheme.

Stable

• Asciidoc
• CSS and Sass
• Cucumber features
• Elixir
• Go
• Haskell
• HTML
• JavaScript, JSON
• Markdown
• PureScript (thanks: Arthur Xavier)
• Ruby
• Rust (thanks: Erasin)
• Vim
• XML

In progress

• Jade
• PHP
• Python
• Switch to estilo in progress, not stable at all and does not reflect all the capabilities of the current mainstream version

Installation

You can use your preferred Vim Package Manager to install One.

Usage

One comes in two flavors: light and dark.

colorscheme one
set background=dark " for the dark version
" set background=light " for the light version

set background has to be called after setting the colorscheme, this explains the issue #21 where Vim tries to determine the best background when ctermbg for the Normal highlight is defined.

Italic support

Some terminals do not support italic, cf. #3.

If your terminal does support italic, you can set the g:one_allow_italics variable to 1 in your .vimrc or .config/nvim/init.vim:

set background=light        " for the light version
let g:one_allow_italics = 1 " I love italic for comments
colorscheme one

iTerm2 can support italic, follow the instructions given in this blog post by Alex Pearce. Make sure to read the update if you are using tmux version 2.1 or above.

True color support

To benefit from the true color support make sure to add the following lines in your .vimrc or .config/nvim/init.vim

"Credit joshdick
"Use 24-bit (true-color) mode in Vim/Neovim when outside tmux.
"If you're using tmux version 2.2 or later, you can remove the outermost $TMUX check and use tmux's 24-bit color support
"(see < http://sunaku.github.io/tmux-24bit-color.html#usage > for more information.)
if (empty($TMUX))
  if (has("nvim"))
    "For Neovim 0.1.3 and 0.1.4 < https://github.com/neovim/neovim/pull/2198 >
    let $NVIM_TUI_ENABLE_TRUE_COLOR=1
  endif
  "For Neovim > 0.1.5 and Vim > patch 7.4.1799 < https://github.com/vim/vim/commit/61be73bb0f965a895bfb064ea3e55476ac175162 >
  "Based on Vim patch 7.4.1770 (`guicolors` option) < https://github.com/vim/vim/commit/8a633e3427b47286869aa4b96f2bfc1fe65b25cd >
  " < https://github.com/neovim/neovim/wiki/Following-HEAD#20160511 >
  if (has("termguicolors"))
    set termguicolors
  endif
endif


set background=dark " for the dark version
" set background=light " for the light version
colorscheme one

Tmux support

To get true color working in tmux, ensure that the $TERM environment variable is set to xterm-256color. Inside the .tmux.conf file we need to override this terminal and also set the default terminal as 256 color.

# Add truecolor support
set-option -ga terminal-overrides ",xterm-256color:Tc"
# Default terminal is 256 colors
set -g default-terminal "screen-256color"

Note that this only works for Neovim (tested on 0.1.5). For some reason Vim (7.5.2334) doesn't play nice. See blog post by Anton Kalyaev for more details on setting up tmux.

For Vim inside tmux, you can add the following snippet in your ~/.vimrc

set t_8b=^[[48;2;%lu;%lu;%lum
set t_8f=^[[38;2;%lu;%lu;%lum

Note: the ^[ in this snippet is a real escape character. To insert it, press Ctrl-V and then Esc.

I've tested the following setup on a Mac:

• iTerm2 nightly build
• Neovim 0.1.4 and 0.1.5-dev
• Vim 7.4.1952

Customising One without fork

Following a request to be able to customise one without the need to fork, one is now exposing a public function to meet this requirement.

After the colorscheme has been initialised, you can call the following function:

one#highlight(group, fg, bg, attribute)

• group: Highlight you want to customise for example vimLineComment
• fg: foreground color for the highlight, without the '#', for example: ff0000
• bg: background color for the highlight, without the '#', for example: ff0000
• attribute: bold, italic, underline or any comma separated combination

For example:

call one#highlight('vimLineComment', 'cccccc', '', 'none')

Contributors

A special thank you to the following people

• laggardkernel: Startup time improvement
• Erasin: Rust support
• Malcolm Ramsay - malramsay64: Gracefully fail if colorscheme is not properly loaded
• Arthur Xavier: PureScript support
• keremc: Tip Vim true color support inside tmux
• jetm: C/C++ highlighting