Replace "emacs" extension with "amuse" extension

It makes clear that extension is related to Muse markup.

src/Text/Pandoc/Extensions.hs

@@ -153,7 +153,7 @@ data Extension =
     | Ext_smart               -- ^ "Smart" quotes, apostrophes, ellipses, dashes
     | Ext_old_dashes          -- ^ -- = em, - before number = en
     | Ext_spaced_reference_links -- ^ Allow space between two parts of ref link
-    | Ext_emacs -- ^ Try to emulate Emacs Muse instead of Amusewiki
+    | Ext_amuse -- ^ Enable Text::Amuse extensions to Emacs Muse markup
     deriving (Show, Read, Enum, Eq, Ord, Bounded, Data, Typeable, Generic)
 
 instance ToJSON Extension where
@@ -315,6 +315,9 @@ getDefaultExtensions "markdown_phpextra" = phpMarkdownExtraExtensions
 getDefaultExtensions "markdown_mmd" = multimarkdownExtensions
 getDefaultExtensions "markdown_github" = githubMarkdownExtensions
 getDefaultExtensions "markdown"        = pandocExtensions
+getDefaultExtensions "muse"            = extensionsFromList
+                                           [Ext_amuse,
+                                            Ext_auto_identifiers]
 getDefaultExtensions "plain"           = plainExtensions
 getDefaultExtensions "gfm"             = githubMarkdownExtensions
 getDefaultExtensions "org"             = extensionsFromList

src/Text/Pandoc/Readers/Muse.hs

@@ -423,7 +423,7 @@ definitionListItem = try $ do
   pure $ do lineContent' <- lineContent
             pure (B.text term, [lineContent'])
   where
-    termParser = (guardEnabled Ext_emacs <|> void spaceChar) >> -- Initial space is required by Amusewiki, but not Emacs Muse
+    termParser = (guardDisabled Ext_amuse <|> void spaceChar) >> -- Initial space is required by Amusewiki, but not Emacs Muse
                  many spaceChar >>
                  many1Till anyChar (lookAhead (void (try (spaceChar >> string "::")) <|> void newline))
     endOfInput = try $ skipMany blankline >> skipSpaces >> eof

test/Tests/Readers/Muse.hs

@@ -10,20 +10,16 @@ import Text.Pandoc
 import Text.Pandoc.Arbitrary ()
 import Text.Pandoc.Builder
 
-muse :: Text -> Pandoc
-muse = purely $ \s -> do
-  setInputFiles ["in"]
-  setOutputFile (Just "out")
-  readMuse def s
+amuse :: Text -> Pandoc
+amuse = purely $ readMuse def { readerExtensions = extensionsFromList [Ext_amuse]}
 
 emacsMuse :: Text -> Pandoc
-emacsMuse = purely $ readMuse def { readerExtensions =
-              enableExtension Ext_emacs pandocExtensions }
+emacsMuse = purely $ readMuse def { readerExtensions = emptyExtensions }
 
 infix 4 =:
 (=:) :: ToString c
      => String -> (Text, c) -> TestTree
-(=:) = test muse
+(=:) = test amuse
 
 spcSep :: [Inlines] -> Inlines
 spcSep = mconcat . intersperse space

test/Tests/Writers/Muse.hs

@@ -8,7 +8,9 @@ import Text.Pandoc.Arbitrary ()
 import Text.Pandoc.Builder
 
 muse :: (ToPandoc a) => a -> String
-muse = museWithOpts def{ writerWrapText = WrapNone }
+muse = museWithOpts def{ writerWrapText = WrapNone,
+                         writerExtensions = extensionsFromList [Ext_amuse,
+                                                                Ext_auto_identifiers] }
 
 museWithOpts :: (ToPandoc a) => WriterOptions -> a -> String
 museWithOpts opts = unpack . purely (writeMuse opts) . toPandoc