nvim-asciidoc-preview

A simple AsciiDoc preview while editing AsciiDoc documents in Neovim.

Warning

The plugin is in an early stage not fully tested. Use at your own risk.

Works on: ✅ Linux, ✅ macOS, but not yet on ❌ Windows (WSL❓)

The plugin started as a playground for learning Neovim plugin programming with Lua and a server component with Node.js. Therefore, many things are not solved optimally and partly implemented twice (plugin and server). Helpful tips are welcome.

• Features
• Requirements
• Installation
• Configuration
• Usage
• FAQ

Features

• Once started with :AsciiDocPreview, a preview of the current AsciiDoc file is shown in the web browser.
• The preview is updated every time the AsciiDoc file is saved.
• When exiting Neovim or using the :AsciiDocPreviewStop command, the preview server is terminated in the background.
• The generation of the HTML preview is done either with:
  • Asciidoctor.js (default, no local installed Asciidoctor needed)
  • Or the locally installed Asciidoctor tools (asciidoctor and asciidoctor-diagram).

Requirements

• Neovim >= 0.8
• Node.js with node and npm command
• curl command

The plugin allows optionally using the local installed Asciidoctor tools.

• This requires the asciidoctor command with the asciidoctor-diagram extension.
  • Install instruction (de)

Installation

lazy.nvim

{
  'tigion/nvim-asciidoc-preview',
  cmd = { 'AsciiDocPreview' },
  ft = { 'asciidoc' },
  build = 'cd server && npm install',
  opts = {
    -- Add user configuration here
  },
}

packer.nvim

Show instruction

use({
  'tigion/nvim-asciidoc-preview',
  run = 'cd server && npm install',
  config = function()
    require('asciidoc-preview').setup({
      -- Add user configuration here
    })
  end,
})

Configuration

For lazy.nvim use the opts or config property.

opts = {
  server = {
    converter = 'js'
  },
  preview = {
    position = 'current',
  },
}

Variant with config

config = function()
  require('asciidoc-preview').setup({
    server = {
      converter = 'js'
    },
    preview = {
      position = 'current',
    },
  })
end,

For other plugin manager, call the setup function require('asciidoc-preview').setup({ ... }) directly.

Default Options

Currently available settings for the user:

{
  server = {
    -- Determines how the AsciiDoc file is converted to HTML for the preview.
    -- `js`  - asciidoctor.js (no local installation needed)
    -- `cmd` - asciidoctor command (local installation needed)
    converter = 'js',

    -- Determines the local port of the preview website.
    -- Must be between 10000 and 65535.
    port = 11235,
  },
  preview = {
    -- Determines the scroll position of the preview website.
    -- `current` - Keep current scroll position
    -- `start`   - Start of the website
    -- `sync`    - (experimental) Same (similar) position as in Neovim
    --             => inaccurate, because very content dependent
    position = 'current',
  },
}

Usage

Command	Description
:AsciiDocPreview	Starts the AsciiDoc preview server in background and opens the current AsciiDoc file in the standard web browser.
:AsciiDocPreviewStop	Stops the AsciiDoc preview server.
:AsciiDocPreviewOpen	(if needed) (Re)Opens the current AsciiDoc file in the standard web browser.
:AsciiDocPreviewNotify	(if needed) Notifies server about an update on the last saved AsciiDoc file.

A keymap suggestion:

vim.keymap.set('n', '<Leader>cp', ':AsciiDocPreview<CR>', { desc = 'Preview AsciiDoc document' })

To use the same keymap for different file types and plugins (e.g. markdown-preview.nvim), place it in after/ftplugin/asciidoc.lua. This way the keymap is only set for AsciiDoc files.

local opts = { buffer = true, silent = true }
opts.desc = 'Preview AsciiDoc document'
vim.keymap.set('n', '<Leader>cp', ':AsciiDocPreview<CR>', opts)

FAQ

How do I report an issue?

1. Open an AsciiDoc document in Neovim.
2. Run the :checkhealth asciidoc-preview command.
3. Open a new Issue.
4. Describe your problem and include:
   • the checkhealth output
   • the Installation/Configuration with the used package manager
   • the content of the ~/.local/state/nvim/nvim-asciidoc-preview-server.log file

Warning

The nvim-asciidoc-preview-server.log file contains private information from the current/last session. These are, for example, the name of your home directory and the names of the AsciiDoc files used.

Do not share this information with others. So please remove or anonymize this information before.