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Fold markdown documents by section.
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masukomi added contributing section to README
includes instructions on how to run tests
Latest commit 3f35acf Apr 9, 2019

README.md

This plugin enables folding by section headings in markdown documents.

Features

This plugin adds the ability to fold the following markdown elements:

  • Headings and everything under them
  • Fenced code blocks

example screenshot of folding functionality

Usage

By default this plugin will use "Stacked" folding which looks like this when everything is folded.

  1 ##    Topmost heading                         [3 lines]---------------------------
  5 ###   Second level heading                    [3 lines]---------------------------
  9 ####  Third level heading                     [3 lines]---------------------------
 13 ####  Another third level heading             [2 lines]---------------------------

You can use "Nested" folding, where folding the "Topmost heading" will also nest all the deeper sections under it.

  1 ##    Topmost heading                         [14 lines]--------------------------

To toggle between the two folding styles use :FoldToggle

If you'd like to have it default to "Nested" folding add this to your ~/.vim/filetype.vim

autocmd FileType markdown set foldexpr=NestedMarkdownFolds()

Installation

After installing markdown-folding using a Vim package manager ( vim-plug, pathogen, Vundle, or Vim 8's native plugin system ). You will need to add the following lines to your ~/.vimrc file or ~/.config/nvim/init.vim for NeoVim:

    set nocompatible
    if has("autocmd")
      filetype plugin indent on
    endif

The markdown-folding plugin provides nothing more than a foldexpr for markdown files. If you want syntax highlighting and other niceties, then go and get tpope's vim-markdown plugin.

Troubleshooting

First, Vim must recognize the file you are in as a Markdown file. set filetype? should return filetype=markdown. If it doesn't you may want to tweak your filetype.vim to make sure it knows to associate your current file extension with Markdown. In the short term you can :set filetype=markdown

There are a variety of ways Vim can be instructed to "fold" things. When you add a plugin to support a new language / format the plugin will tell Vim "Hey here's the method to use for figuring out the start and end of a fold with this language". This plugin uses a foldmethod of expr. Running :set foldmethod? should return foldmethod=expr. If you see something else then you've likely got some other Vim configuration overriding the setting in the plugin. If, after running :set foldmethod=expr, things still aren't working, then something is most likely amiss in your ~/.vimrc (or ~/.config/nvim/init.vim if you use NeoVim).

Contributing

PRs are always a welcome thing, but it should be noted that the current intent is to keep this plugin pretty focused on folding Markdown.

All new PRs should include tests. If you're fixing a bug please add a test to make sure it never comes back. If you're adding a new feature please add tests to make sure we never break it with future changes.

The tests are currently all contained in t/folding.vim

Running Tests

The test setup requires Ruby. For those unfamiliar with Ruby development you'll want to cd into the vim-markdown-folding directory and run the following commands in the terminal.

Install bundler if you don't have it already.

gem install bundler

Tell bundler to install the required dependencies

bundle install

Tell bundler to run the tests

bundle exec rake test

The end of the output should look something like this

t/folding.vim .. ok
All tests successful.
Files=1, Tests=41,  1 wallclock secs ( 0.03 usr  0.01 sys +  0.57 cusr  0.12 csys =  0.73 CPU)
Result: PASS

License

Created by Drew Neil. Copyright Drew Niel and all the contributors. Distributed under the same terms as Vim itself. See :help license.

With community improvements by:

Maintained by masukomi

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