This avoids things like:

  ~$ cat tools/validation_helpers.py
  ...
          return self.is_block(ast_node) and has_heading~$

with your next prompt way over to the right ;).

From http://getbootstrap.com/components/#panels-alternatives
the only panel that the font color is white is
`panel-primary` and for that reason it is the only one that we can't use.

This replace the use of `panel-primary` with `panel-warning`
since prerequisites and learning objectives **never**
appear in the same file.

Blockquotes that have a header (with class "callout", "challenge",
"prereq", "objectives") as their first element will get rendered as
<div>s.  Their structure will resemble Bootstrap's panel:
http://getbootstrap.com/components/#panels-alternatives

There's currently an issue with pandoc: the header nested under the
blockquote will never have assigned attributes.  This is causing the
panel's heading to look enormous.  I'll fix it in
https://github.com/swcarpentry/styles/pull/11.

BTW: glyphicons won't render correctly unless 'fonts' directory gets
moved up one level to the 'css' directory. I'll fix that in
https://github.com/swcarpentry/styles/pull/11 too.

This is based on 966a0322 from gh-pages.

Thanks to @ChristinaLK to report the problem.

Our authors use this label to mark unfinished/work in progress lessons.

Implement template-specific callout rules. Add tests and fix bugs revealed.

Narrow def of callout: block must have heading.

Simplify way that callout counts are tracked, improve log messages, and add further unit tests of callout validation.

Ensure that callout validation is actually run

default instead of figure/.

- Delete GitHub's default label that will not be used
- Create new labels
- Update color for labels

1.  Adding `tools/chunk-options.R` with support for Pandoc-based conversion of R Markdown to plain Markdown.
2.  Modifying `Makefile` to handle any R Markdown files that are present.

Changes have been checked by @jdblischak in the `r-novice-inflammation` project.

Changes to link text validation per #58 and #90. Validate link text in index.md (always), or only in headings (reference.md and instructors.md)

Demote msg level when http links skipped

Strip anchor from filenames in error messages

Fix typo

This solves #77 by add id attribute to every item of a definition.

Minor changes to make error messages consistent, and possibly less crashy. Still need unit tests to trigger this code.

This is needed to enable users jump to glossary entries.

Add validation methods and refactor ast helpers to separate class

Add tiny logging message; prep for first push to github fork

Start adding tests

Fix errors revealed by unit tests

Update validator to check heading order; tests passing

Validation of links and changes to heading validation

Tiny comment cleanup; push to share version with swc

Add some descriptive comments and create minimal validator example (for instructors.md) to demonstrate subclassing

Split helpers to separate file and update for newest index.md template

Grooming

Bring up to spec with newest versions of lesson templates. Add tests to ensure all templates pass validation.

Saner default assumption about markdown file locations

Add skeletons for remaining validators. Incorporate ranier's code for batch validation.

Code changes for single-file python 2 and 3 compatibility.

Refactor out template validation logic in prep for cmd line rework

Proof of concept refactor to command line sig for @rgaia-cs (issue #34)

With no path provided, default to curdir, not a hard-coded default

Implement license and discussion validators. Some test cleanup.

Validate file links against page titles. Add line length check.

Fix python3 hash error

Rename validator to check

Conflicts:
	tools/validate_markdown_template.py

Enforce section heading levels + pep8 cleanup

Improved link validation for non-html files

Validate images as well as links

Verify that all headings are exactly level 2

Link text validation based on document header "subtitle" instead of "title".

Adjustments based on run against the SQL repo.

Fix links to topics

By default only show erros and warnings to user

- Add another argument for CLI to enable debug log level
- Change some log message to debug instead of info
- Add file information for errors and warnings

Fix import at check

From [PEP8](https://www.python.org/dev/peps/pep-0008/#imports)

> Imports should usually be on separate lines, e.g.:
>
> Yes: import os
>      import sys
>
> No:  import sys, os

Heading bugfixes, update failing tests, and cleanup. fix swcarpentry/lesson-template#39, swcarpentry/lesson-template#42 .

Add validation of glossary

Slight clarification to log messages.

Skip validate some links in index

Fix super() call for python2; avoid mutable default argument.

Lesson template validator.

This means that you can trigger div creation by

1. Using a special title
2. Using a special class on an arbitrary title

- Use UPPERCASE for global constants
- Add Learning Objectives to SPECIAL_TITLES
- Fix samples

Previously, Div creation was triggered by a Blockquote that began with a
header that contained a single class that was in a list of special
classes.

Now, Div creation is *also* triggered by a Blockquote that begins with a
header that has it's text contained in a list of special titles. The
title is used to lookup an appropriate class to give the Div.

In particular, 'prerequesites' is a special title, giving the class
'prereq'.

This input:

    > ## Prerequesites
    >
    > A short paragraph describing what learners need to know before
    > tackling this lesson.

will trigger this output:

    <div id="prerequisites" class="prereq">
    <h2>Prerequisites</h2>
    <p>A short paragraph describing what learners need to know before
    tackling this lesson.</p>
    </div>