bc.nvim

A simple Neovim plugin to evaluate mathematical expressions using bc in markdown and telekasten files.

Installation

lazy.nvim

Add to your lazy.nvim plugin specification:

"navicore/bc.nvim"

Or in your full lazy setup:

require("lazy").setup({
  -- your other plugins...
  "navicore/bc.nvim",
  -- more plugins...
})

Other plugin managers

packer.nvim

use 'navicore/bc.nvim'

vim-plug

Plug 'navicore/bc.nvim'

Usage

1. Open a markdown or telekasten file
2. Visually select a mathematical expression (e.g., 2 * (33 - 1))
3. Run :Bc or :'<,'>Bc
4. The selection will be replaced with the expression and its result (e.g., 2 * (33 - 1) = 64)

Financial Formatting

The plugin supports currency and comma formatting:

• $ symbols are preserved and the result uses 2 decimal places
• Comma separators in numbers (e.g., 10,000) are preserved in the result

Examples:

• 2 * $5 → 2 * $5 = $10.00
• $100 / 3 → $100 / 3 = $33.33
• 2 * 10,000 → 2 * 10,000 = 20,000
• $1,000 + $500 → $1,000 + $500 = $1,500.00

Decimal Handling

The output type is inferred from the input:

• Integers only → integer result (e.g., 10 / 3 = 3)
• Any float in input → float result matching max decimal places (e.g., 10.0 / 3 = 3.3)
• Currency ($) → always 2 decimal places (e.g., $10 / 3 = $3.33)

To get decimal results from integer division, use a float in the input: 10.0 / 3 instead of 10 / 3.

Requirements

• Neovim 0.7+
• bc command-line calculator (usually pre-installed on Unix-like systems)

Limitations

• Only works in markdown or telekasten files (filetype must be markdown or telekasten)
• Uses bc syntax, so expressions must be valid bc input