Add pattern-matching for other <literal> formats

Author: Alhadis

.gitattributes

@@ -2,5 +2,6 @@
 /spec/fixtures/*/* binary
 
 # Exclude from package distribution
+*.sy         export-ignore linguist-language=RegExp
 /spec        export-ignore
 /.travis.yml export-ignore

grammars/muse-literal.sy

@@ -0,0 +1,50 @@
+­­
+name: meta.unprocessed.$8-output.muse
+begin: /(?x)
+	(?<0: meta.tag.literal.muse>
+		^ \s*
+		(?<1: entity.name.tag.quote.muse>
+			(?<2: punctuation.definition.tag.begin.muse> <)
+			literal \s+
+			
+			(?<3: meta.attribute-with-value.style.muse>
+				(?<4: entity.other.attribute-name.$_.muse> style) \s*
+				(?<5: punctuation.separator.key-value.muse> =)    \s*
+				(?<6: string.quoted.muse>
+					(?<7: punctuation.definition.string.begin.muse> "|'|\b)
+					( book-latex
+					| book-pdf
+					| chapbook-latex
+					| chapbook-pdf
+					| context-pdf
+					| context-slides-pdf
+					| context-slides
+					| context
+					| journal-book-latex
+					| journal-book-pdf
+					| journal-latex
+					| journal-pdf
+					| journal-xhtml
+					| latexcjk
+					| latex
+					| lecture-notes-pdf
+					| lecture-notes
+					| pdfcjk
+					| pdf
+					| poem-latex
+					| poem-pdf
+					| slides-pdf
+					| slides
+					)
+					(?<8: punctuation.definition.string.end.muse> \7)
+				)
+			) \s*
+			
+			(?<9: punctuation.definition.tag.end.muse> >)
+		)
+	)
+/
+
+end: /(</)literal(>)/
+contentName: text.embedded.latex
+patterns: [include: "text.tex.latex"]