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Showing content from https://github.com/slang800/tidy-markdown below:

notslang/tidy-markdown: Beautify Markdown, fixing formatting mistakes and standardizing syntax

Beautify Markdown, fixing formatting mistakes and converting basic HTML & Unicode into their Markdown equivalents. Based on the conventions in Carrot Creative's Markdown Styleguide and built on Marked.

There is also an Atom Plugin to run this entirely within your editor.

Tidy Markdown is an npm package, so it can be installed like this:

npm install tidy-markdown -g

Tidy Markdown includes a simple CLI. It operates entirely over STDIN/STDOUT. For example:

$ echo "# a header #" | tidy-markdown
# a header

Or using a file:

$ tidy-markdown < ./ugly-markdown
# Some markdown

Lorem ipsum dolor adipiscing

- one
- two
- three

And, of course, we can output to a file too:

$ tidy-markdown < ./ugly-markdown > ./clean-markdown

If you want to rewrite a file in-place, you can use sponge from moreutils. If you did tidy-markdown < ./README.md > ./README.md you'd end up with an empty file.

$ tidy-markdown < ./README.md | sponge ./README.md

The --help arg will make it show a usage page:

$ tidy-markdown --help
usage: tidy-markdown [-h] [-v] [--no-ensure-first-header-is-h1]

Fix ugly markdown. Unformatted Markdown is read from STDIN, formatted, and
written to STDOUT.

Optional arguments:
  -h, --help            Show this help message and exit.
  -v, --version         Show program's version number and exit.
  --no-ensure-first-header-is-h1
                        Disable fixing the first header when it isn't an H1.
                        This is useful if the markdown you're processing
                        isn't a full document, but rather a piece of a larger
                        document.

Tidy Markdown only exports one function. Here's an example of how it can be used:

tidyMarkdown = require 'tidy-markdown'

uglyMarkdown = '''
# Some markdown #

Lorem ipsum dolor adipiscing


- one
*  two
+ three
'''

cleanMarkdown = tidyMarkdown(uglyMarkdown)
console.log cleanMarkdown

which outputs:

# Some markdown

Lorem ipsum dolor adipiscing

- one
- two
- three

You can also pass options through a 2nd arg, like tidyMarkdown(uglyMarkdown, {ensureFirstHeaderIsH1: false}). The option ensureFirstHeaderIsH1 is the only one right now.

• Standardize syntactical elements to use a single way of being written (for example, all unordered lists are formatted to start with hyphens, rather than allowing asterisks and/or addition signs to be mixed in).
• Fix numbering - making ordered lists count naturally from 1 to n and reference links do the same (based on first occurance).
• Make headers move from h1 to smaller without gaps (like an h1 followed by an h4 would be corrected to an h1 followed by an h2).
• Decode Unicode characters that have markdown equivalents (like a horizontal ellipsis becomes "..." and an em-dash becomes "--").
• Format YAML front-matter and Markdown tables.
• Convert HTML elements into their Markdown equivalents. For example, <em>text</em> becomes _text_.

Tidy Markdown works hard to keep configuration to a minimum. The goal is to create a highly readable, canonical representation of Markdown, much like gofmt has done for Go. Having extra configuration would defeat that purpose and add extra maintenance work.

That's not to say you shouldn't open issues if you find the output ugly, that's encouraged, especially in the styleguide repo because without criticism it won't get better. However, you should provide examples and a good argument to support the change.

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