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2 days ago



Colorize text with ANSI escape sequences (8, 16, 256 or TrueColor)


Using vim-plug:

Plug 'm00qek/baleia.nvim', { 'tag': 'v1.3.0' }

Using packer.nvim:

use { 'm00qek/baleia.nvim', tag = 'v1.3.0' }


baleia can colorize an entire buffer or/and apply colors every time a new line is added to it.

Colorizing the entire buffer

The best approach is to create a command. In vimscript:

let s:baleia = luaeval("require('baleia').setup { }")
command! BaleiaColorize call s:baleia.once(bufnr('%'))

To highlight the current buffer:


Automatically colorize when lines are added to the buffer

To automatically colorize when a new line is added use

let s:baleia = luaeval("require('baleia').setup { }")
autocmd BufWinEnter my-buffer call s:baleia.automatically(bufnr('%'))

where my_buffer is how you identify in which buffers it should run (please read :h autocmd)

Setup options

When calling the setup function, the following options are available:

option default value
name 'BaleiaColors'
strip_ansi_codes true
line_starts_at 1 (one-indexed)


By default BaleiaColors, this will be the name of the highlight namespace defined by baleia as well as a prefix in the name of all highlight groups created by it.


By default true, indicates whether baleia should or not remove the ANSI escape sequence of the text after colorizing it.


By default 1, one-indexed, indicates in which column baleia should start colorizing lines.

With Conjure

This can be used to colorize Conjure log buffer. To do it you must tell conjure to not strip ANSI escape codes:

" tell Conjure to not strip ANSI sequences
let g:conjure#log#strip_ansi_escape_sequences_line_limit = 0

To automatically enable baleia for all Conjure log buffers use

let s:baleia = luaeval("require('baleia').setup { line_starts_at = 3 }")
autocmd BufWinEnter conjure-log-* call s:baleia.automatically(bufnr('%'))

What to do if something looks wrong

Enable logs with

let s:baleia = luaeval("require('baleia').setup { log = 'DEBUG' }")
command! BaleiaLogs call s:baleia.logger.show()

You can set the log level to ERROR, WARN, INFO or DEBUG. You can see the log using BaleiaLogs.

Developer API

baleia provides two functions, buf_set_lines and buf_set_text, that have the same interface as the default vim.api.nvim_buf_set_lines and vim.api.nvim_but_set_text. Using those is very efficient because they do all color detection and ANSI code stripping before writing anything to the buffer. Example:

local new_lines = { '\x1b[32mHello \x1b[33mworld!' }

-- appending using Neovim standard API
local lastline = vim.api.nvim_buf_line_count(0)
vim.api.nvim_buf_set_lines(0, lastline, lastline, true, new_lines)

-- appending using Baleia API
local lastline = vim.api.nvim_buf_line_count(0)
local baleia = require('baleia').setup { }
baleia.buf_set_lines(0, lastline, lastline, true, new_lines)