Add Muse writer (#3489)

* Add Muse writer

* Advertise new Muse writer

* Muse writer: add regressions tests

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+#author John MacFarlane
+#title Pandoc Test Suite
+#date July 17, 2006
+
+This is a set of tests for pandoc. Most of them are adapted from John Gruber’s
+markdown test suite.
+
+----
+
+* Headers
+
+#headers
+
+** Level 2 with an [[/url][embedded link]]
+
+#level-2-with-an-embedded-link
+
+*** Level 3 with <em>emphasis</em>
+
+#level-3-with-emphasis
+
+**** Level 4
+
+#level-4
+
+***** Level 5
+
+#level-5
+
+* Level 1
+
+#level-1
+
+** Level 2 with <em>emphasis</em>
+
+#level-2-with-emphasis
+
+*** Level 3
+
+#level-3
+with no blank line
+
+** Level 2
+
+#level-2
+with no blank line
+
+----
+
+* Paragraphs
+
+#paragraphs
+Here’s a regular paragraph.
+
+In Markdown 1.0.0 and earlier. Version 8. This line turns into a list item.
+Because a hard-wrapped line in the middle of a paragraph looked like a list
+item.
+
+Here’s one with a bullet. <verbatim>*</verbatim> criminey.
+
+There should be a hard line break<br>
+here.
+
+----
+
+* Block Quotes
+
+#block-quotes
+E-mail style:
+
+<quote>
+This is a block quote. It is pretty short.
+</quote>
+
+<quote>
+Code in a block quote:
+
+<example>
+sub status {
+    print "working";
+}
+</example>
+
+A list:
+
+1. item one
+2. item two
+
+Nested block quotes:
+
+<quote>
+nested
+</quote>
+
+<quote>
+nested
+</quote>
+</quote>
+
+This should not be a block quote: 2 <verbatim>></verbatim> 1.
+
+And a following paragraph.
+
+----
+
+* Code Blocks
+
+#code-blocks
+Code:
+
+<example>
+---- (should be four hyphens)
+
+sub status {
+    print "working";
+}
+
+this code block is indented by one tab
+</example>
+
+And:
+
+<example>
+    this code block is indented by two tabs
+
+These should not be escaped:  \$ \\ \> \[ \{
+</example>
+
+----
+
+* Lists
+
+#lists
+
+** Unordered
+
+#unordered
+Asterisks tight:
+
+ - asterisk 1
+ - asterisk 2
+ - asterisk 3
+
+Asterisks loose:
+
+ - asterisk 1
+ - asterisk 2
+ - asterisk 3
+
+Pluses tight:
+
+ - Plus 1
+ - Plus 2
+ - Plus 3
+
+Pluses loose:
+
+ - Plus 1
+ - Plus 2
+ - Plus 3
+
+Minuses tight:
+
+ - Minus 1
+ - Minus 2
+ - Minus 3
+
+Minuses loose:
+
+ - Minus 1
+ - Minus 2
+ - Minus 3
+
+** Ordered
+
+#ordered
+Tight:
+
+ 1. First
+ 2. Second
+ 3. Third
+
+and:
+
+ 1. One
+ 2. Two
+ 3. Three
+
+Loose using tabs:
+
+ 1. First
+ 2. Second
+ 3. Third
+
+and using spaces:
+
+ 1. One
+ 2. Two
+ 3. Three
+
+Multiple paragraphs:
+
+ 1. Item 1, graf one.
+
+    Item 1. graf two. The quick brown fox jumped over the lazy dog’s back.
+ 2. Item 2.
+ 3. Item 3.
+
+** Nested
+
+#nested
+ - Tab
+   - Tab
+     - Tab
+
+Here’s another:
+
+ 1. First
+ 2. Second:
+    - Fee
+    - Fie
+    - Foe
+ 3. Third
+
+Same thing but with paragraphs:
+
+ 1. First
+ 2. Second:
+
+    - Fee
+    - Fie
+    - Foe
+ 3. Third
+
+** Tabs and spaces
+
+#tabs-and-spaces
+ - this is a list item indented with tabs
+ - this is a list item indented with spaces
+
+   - this is an example list item indented with tabs
+   - this is an example list item indented with spaces
+
+** Fancy list markers
+
+#fancy-list-markers
+ 2. begins with 2
+ 3. and now 3
+
+    with a continuation
+
+    iv. sublist with roman numerals, starting with 4
+    v.  more items
+        A. a subsublist
+        B. a subsublist
+
+Nesting:
+
+ A. Upper Alpha
+    I. Upper Roman.
+       6. Decimal start with 6
+          c. Lower alpha with paren
+
+Autonumbering:
+
+ 1. Autonumber.
+ 2. More.
+    1. Nested.
+
+Should not be a list item:
+
+M.A. 2007
+
+B. Williams
+
+----
+
+* Definition Lists
+
+#definition-lists
+Tight using spaces:
+
+ apple :: red fruit
+ orange :: orange fruit
+ banana :: yellow fruit
+
+Tight using tabs:
+
+ apple :: red fruit
+ orange :: orange fruit
+ banana :: yellow fruit
+
+Loose:
+
+ apple :: red fruit
+ orange :: orange fruit
+ banana :: yellow fruit
+
+Multiple blocks with italics:
+
+ <em>apple</em> :: red fruit
+
+                   contains seeds, crisp, pleasant to taste
+ <em>orange</em> :: orange fruit
+
+                    <example>
+                    { orange code block }
+                    </example>
+
+                    <quote>
+orange block quote
+                    </quote>
+
+Multiple definitions, tight:
+
+ apple :: red fruit
+          computer
+ orange :: orange fruit
+           bank
+
+Multiple definitions, loose:
+
+ apple :: red fruit
+
+          computer
+ orange :: orange fruit
+
+           bank
+
+Blank line after term, indented marker, alternate markers:
+
+ apple :: red fruit
+
+          computer
+ orange :: orange fruit
+
+           1. sublist
+           2. sublist
+
+* HTML Blocks
+
+#html-blocks
+Simple block on one line:
+
+fooAnd nested without indentation:
+
+foo
+
+barInterpreted markdown in a table:
+
+<literal style="html">
+<table>
+</literal>
+
+<literal style="html">
+<tr>
+</literal>
+
+<literal style="html">
+<td>
+</literal>
+
+This is <em>emphasized</em>
+
+<literal style="html">
+</td>
+</literal>
+
+<literal style="html">
+<td>
+</literal>
+
+And this is <strong>strong</strong>
+
+<literal style="html">
+</td>
+</literal>
+
+<literal style="html">
+</tr>
+</literal>
+
+<literal style="html">
+</table>
+</literal>
+
+<literal style="html">
+<script type="text/javascript">document.write('This *should not* be interpreted as markdown');</script>
+</literal>
+
+Here’s a simple block:
+
+foo
+
+This should be a code block, though:
+
+<example>
+<div>
+    foo
+</div>
+</example>
+
+As should this:
+
+<example>
+<div>foo</div>
+</example>
+
+Now, nested:
+
+fooThis should just be an HTML comment:
+
+<literal style="html">
+<!-- Comment -->
+</literal>
+
+Multiline:
+
+<literal style="html">
+<!--
+Blah
+Blah
+-->
+</literal>
+
+<literal style="html">
+<!--
+    This is another comment.
+-->
+</literal>
+
+Code block:
+
+<example>
+<!-- Comment -->
+</example>
+
+Just plain comment, with trailing spaces on the line:
+
+<literal style="html">
+<!-- foo -->
+</literal>
+
+Code:
+
+<example>
+<hr />
+</example>
+
+Hr’s:
+
+<literal style="html">
+<hr>
+</literal>
+
+<literal style="html">
+<hr />
+</literal>
+
+<literal style="html">
+<hr />
+</literal>
+
+<literal style="html">
+<hr>
+</literal>
+
+<literal style="html">
+<hr />
+</literal>
+
+<literal style="html">
+<hr />
+</literal>
+
+<literal style="html">
+<hr class="foo" id="bar" />
+</literal>
+
+<literal style="html">
+<hr class="foo" id="bar" />
+</literal>
+
+<literal style="html">
+<hr class="foo" id="bar">
+</literal>
+
+----
+
+* Inline Markup
+
+#inline-markup
+This is <em>emphasized</em>, and so <em>is this</em>.
+
+This is <strong>strong</strong>, and so <strong>is this</strong>.
+
+An <em>[[/url][emphasized link]]</em>.
+
+<strong><em>This is strong and em.</em></strong>
+
+So is <strong><em>this</em></strong> word.
+
+<strong><em>This is strong and em.</em></strong>
+
+So is <strong><em>this</em></strong> word.
+
+This is code: <code><verbatim>></verbatim></code>, <code>$</code>,
+<code>\</code>, <code>\$</code>, <code><verbatim><html></verbatim></code>.
+
+<del>This is <em>strikeout</em>.</del>
+
+Superscripts: a<sup>bc</sup>d a<sup><em>hello</em></sup>
+a<sup>hello there</sup>.
+
+Subscripts: H<sub>2</sub>O, H<sub>23</sub>O, H<sub>many of them</sub>O.
+
+These should not be superscripts or subscripts, because of the unescaped
+spaces: a^b c^d, a~b c~d.
+
+----
+
+* Smart quotes, ellipses, dashes
+
+#smart-quotes-ellipses-dashes
+"Hello," said the spider. "'Shelob' is my name."
+
+'A', 'B', and 'C' are letters.
+
+'Oak,' 'elm,' and 'beech' are names of trees. So is 'pine.'
+
+'He said, "I want to go."' Were you alive in the 70’s?
+
+Here is some quoted '<code>code</code>' and a
+"[[http://example.com/?foo=1&bar=2][quoted link]]".
+
+Some dashes: one—two — three—four — five.
+
+Dashes between numbers: 5–7, 255–66, 1987–1999.
+
+Ellipses…and…and….
+
+----
+
+* LaTeX
+
+#latex
+ - <literal style="tex">\cite[22-23]{smith.1899}</literal>
+ - 2 + 2 <verbatim>=</verbatim> 4
+ - <em>x</em> ∈ <em>y</em>
+ - <em>α</em> ∧ <em>ω</em>
+ - 223
+ - <em>p</em>-Tree
+ - Here’s some display math:
+   <verse><verbatim>$$\frac{d}{dx}f(x)=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}$$</verbatim></verse>
+ - Here’s one that has a line break in it:
+   <em>α</em> + <em>ω</em> × <em>x</em><sup>2</sup>.
+
+These shouldn’t be math:
+
+ - To get the famous equation, write
+   <code><verbatim>$e = mc^2$</verbatim></code>.
+ - $22,000 is a <em>lot</em> of money. So is $34,000. (It worked if "lot" is
+   emphasized.)
+ - Shoes ($20) and socks ($5).
+ - Escaped <code>$</code>: $73 <em>this should be emphasized</em> 23$.
+
+Here’s a LaTeX table:
+
+<literal style="latex">
+\begin{tabular}{|l|l|}\hline
+Animal & Number \\ \hline
+Dog    & 2      \\
+Cat    & 1      \\ \hline
+\end{tabular}
+</literal>
+
+----
+
+* Special Characters
+
+#special-characters
+Here is some unicode:
+
+ - I hat: Î
+ - o umlaut: ö
+ - section: §
+ - set membership: ∈
+ - copyright: ©
+
+AT&T has an ampersand in their name.
+
+AT&T is another way to write it.
+
+This & that.
+
+4 <verbatim><</verbatim> 5.
+
+6 <verbatim>></verbatim> 5.
+
+Backslash: \
+
+Backtick: `
+
+Asterisk: <verbatim>*</verbatim>
+
+Underscore: _
+
+Left brace: {
+
+Right brace: }
+
+Left bracket: <verbatim>[</verbatim>
+
+Right bracket: <verbatim>]</verbatim>
+
+Left paren: (
+
+Right paren: )
+
+Greater-than: <verbatim>></verbatim>
+
+Hash: #
+
+Period: .
+
+Bang: !
+
+Plus: +
+
+Minus: -
+
+----
+
+* Links
+
+#links
+
+** Explicit
+
+#explicit
+Just a [[/url/][URL]].
+
+[[/url/][URL and title]].
+
+[[/url/][URL and title]].
+
+[[/url/][URL and title]].
+
+[[/url/][URL and title]]
+
+[[/url/][URL and title]]
+
+[[/url/with_underscore][with_underscore]]
+
+[[mailto:nobody@nowhere.net][Email link]]
+
+[[][Empty]].
+
+** Reference
+
+#reference
+Foo [[/url/][bar]].
+
+Foo [[/url/][bar]].
+
+Foo [[/url/][bar]].
+
+With [[/url/][embedded <verbatim>[brackets]</verbatim>]].
+
+[[/url/][b]] by itself should be a link.
+
+Indented [[/url][once]].
+
+Indented [[/url][twice]].
+
+Indented [[/url][thrice]].
+
+This should <verbatim>[not][]</verbatim> be a link.
+
+<example>
+[not]: /url
+</example>
+
+Foo [[/url/][bar]].
+
+Foo [[/url/][biz]].
+
+** With ampersands
+
+#with-ampersands
+Here’s a [[http://example.com/?foo=1&bar=2][link with an ampersand in the
+URL]].
+
+Here’s a link with an amersand in the link text: [[http://att.com/][AT&T]].
+
+Here’s an [[/script?foo=1&bar=2][inline link]].
+
+Here’s an [[/script?foo=1&bar=2][inline link in pointy braces]].
+
+** Autolinks
+
+#autolinks
+With an ampersand: [[http://example.com/?foo=1&bar=2]]
+
+ - In a list?
+ - [[http://example.com/]]
+ - It should.
+
+An e-mail address: [[mailto:nobody@nowhere.net][nobody@nowhere.net]]
+
+<quote>
+Blockquoted: [[http://example.com/]]
+</quote>
+
+Auto-links should not occur here:
+<code><verbatim><http://example.com/></verbatim></code>
+
+<example>
+or here: <http://example.com/>
+</example>
+
+----
+
+* Images
+
+#images
+From "Voyage dans la Lune" by Georges Melies (1902):
+
+[[lalune.jpg][Voyage dans la Lune]]
+
+Here is a movie [[movie.jpg][movie]] icon.
+
+----
+
+* Footnotes
+
+#footnotes
+Here is a footnote reference,[1] and another.[2] This should <em>not</em> be a
+footnote reference, because it contains a <verbatim>space.[^my</verbatim>
+<verbatim>note]</verbatim> Here is an inline note.[3]
+
+<quote>
+Notes can go in quotes.[4]
+</quote>
+
+ 1. And in list items.[5]
+
+This paragraph should not be part of the note, as it is not indented.
+
+[1] Here is the footnote. It can go anywhere after the footnote reference. It
+    need not be placed at the end of the document.
+
+[2] Here’s the long note. This one contains multiple blocks.
+
+    Subsequent blocks are indented to show that they belong to the footnote
+    (as with list items).
+
+    <example>
+      { <code> }
+    </example>
+
+    If you want, you can indent every line, but you can also be lazy and just
+    indent the first line of each block.
+
+[3] This is <em>easier</em> to type. Inline notes may contain
+    [[http://google.com][links]] and <code><verbatim>]</verbatim></code>
+    verbatim characters, as well as <verbatim>[bracketed</verbatim>
+    <verbatim>text].</verbatim>
+
+[4] In quote.
+
+[5] In list.