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|
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Readers.Org.ExportSettings
Copyright : © 2016–2020 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Parsers for Org-mode export options.
-}
module Text.Pandoc.Readers.Org.ExportSettings
( exportSettings
) where
import Text.Pandoc.Class.PandocMonad (PandocMonad, report)
import Text.Pandoc.Logging (LogMessage (UnknownOrgExportOption))
import Text.Pandoc.Readers.Org.ParserState
import Text.Pandoc.Readers.Org.Parsing
import Control.Monad (mzero, void)
import Data.Char (toLower)
import Data.Maybe (listToMaybe)
import Data.Text (Text, unpack)
-- | Read and handle space separated org-mode export settings.
exportSettings :: PandocMonad m => OrgParser m ()
exportSettings = void $ sepBy skipSpaces exportSetting
-- | Setter function for export settings.
type ExportSettingSetter a = a -> ExportSettings -> ExportSettings
-- | Read and process a single org-mode export option.
exportSetting :: PandocMonad m => OrgParser m ()
exportSetting = choice
[ booleanSetting "^" (\val es -> es { exportSubSuperscripts = val })
, booleanSetting "'" (\val es -> es { exportSmartQuotes = val })
, booleanSetting "*" (\val es -> es { exportEmphasizedText = val })
, booleanSetting "-" (\val es -> es { exportSpecialStrings = val })
, ignoredSetting ":"
, ignoredSetting "<"
, booleanSetting "\\n" (\val es -> es { exportPreserveBreaks = val })
, archivedTreeSetting "arch" (\val es -> es { exportArchivedTrees = val })
, booleanSetting "author" (\val es -> es { exportWithAuthor = val })
, ignoredSetting "c"
-- org-mode allows the special value `comment` for creator, which we'll
-- interpret as true as it doesn't make sense in the context of Pandoc.
, booleanSetting "creator" (\val es -> es { exportWithCreator = val })
, complementableListSetting "d" (\val es -> es { exportDrawers = val })
, ignoredSetting "date"
, booleanSetting "e" (\val es -> es { exportWithEntities = val })
, booleanSetting "email" (\val es -> es { exportWithEmail = val })
, booleanSetting "f" (\val es -> es { exportWithFootnotes = val })
, integerSetting "H" (\val es -> es { exportHeadlineLevels = val })
, ignoredSetting "inline"
, ignoredSetting "num"
, booleanSetting "p" (\val es -> es { exportWithPlanning = val })
, ignoredSetting "pri"
, ignoredSetting "prop"
, ignoredSetting "stat"
, booleanSetting "tags" (\val es -> es { exportWithTags = val })
, ignoredSetting "tasks"
, texSetting "tex" (\val es -> es { exportWithLatex = val })
, ignoredSetting "timestamp"
, ignoredSetting "title"
, ignoredSetting "toc"
, booleanSetting "todo" (\val es -> es { exportWithTodoKeywords = val })
, booleanSetting "|" (\val es -> es { exportWithTables = val })
, ignoreAndWarn
] <?> "export setting"
-- | Generic handler for export settings. Takes a parser which converts
-- the plain option text into a data structure.
genericExportSetting :: Monad m
=> OrgParser m a
-> Text
-> ExportSettingSetter a
-> OrgParser m ()
genericExportSetting optionParser settingIdentifier setter = try $ do
_ <- textStr settingIdentifier *> char ':'
value <- optionParser
updateState $ modifyExportSettings value
where
modifyExportSettings val st =
st { orgStateExportSettings = setter val . orgStateExportSettings $ st }
-- | A boolean option, either nil (False) or non-nil (True).
booleanSetting :: Monad m => Text -> ExportSettingSetter Bool -> OrgParser m ()
booleanSetting = genericExportSetting elispBoolean
-- | An integer-valued option.
integerSetting :: Monad m => Text -> ExportSettingSetter Int -> OrgParser m ()
integerSetting = genericExportSetting parseInt
where
parseInt = try $
many1 digit >>= maybe mzero (return . fst) . listToMaybe . reads
-- | Either the string "headline" or an elisp boolean and treated as an
-- @ArchivedTreesOption@.
archivedTreeSetting :: Monad m
=> Text
-> ExportSettingSetter ArchivedTreesOption
-> OrgParser m ()
archivedTreeSetting =
genericExportSetting $ archivedTreesHeadlineSetting <|> archivedTreesBoolean
where
archivedTreesHeadlineSetting =
ArchivedTreesHeadlineOnly <$ optionString "headline"
archivedTreesBoolean = try $ do
exportBool <- elispBoolean
return $
if exportBool
then ArchivedTreesExport
else ArchivedTreesNoExport
-- | A list or a complement list (i.e. a list starting with `not`).
complementableListSetting :: Monad m
=> Text
-> ExportSettingSetter (Either [Text] [Text])
-> OrgParser m ()
complementableListSetting = genericExportSetting $ choice
[ Left <$> complementTextList
, Right <$> stringList
, (\b -> if b then Left [] else Right []) <$> elispBoolean
]
where
-- Read a plain list of strings.
stringList :: Monad m => OrgParser m [Text]
stringList = try $
char '('
*> sepBy elispText spaces
<* char ')'
-- Read an emacs lisp list specifying a complement set.
complementTextList :: Monad m => OrgParser m [Text]
complementTextList = try $
string "(not "
*> sepBy elispText spaces
<* char ')'
elispText :: Monad m => OrgParser m Text
elispText = try $
char '"'
*> manyTillChar alphaNum (char '"')
-- | Parses either @t@, @nil@, or @verbatim@ into a 'TeXExport' value.
texSetting :: Monad m
=> Text
-> ExportSettingSetter TeXExport
-> OrgParser m ()
texSetting = genericExportSetting $ texVerbatim <|> texBoolean
where
texVerbatim = TeXVerbatim <$ optionString "verbatim"
texBoolean = try $ do
exportBool <- elispBoolean
return $
if exportBool
then TeXExport
else TeXIgnore
-- | Read but ignore the export setting.
ignoredSetting :: Monad m => Text -> OrgParser m ()
ignoredSetting s = try (() <$ textStr s <* char ':' <* many1 nonspaceChar)
-- | Read any setting string, but ignore it and emit a warning.
ignoreAndWarn :: PandocMonad m => OrgParser m ()
ignoreAndWarn = try $ do
opt <- many1Char nonspaceChar
report (UnknownOrgExportOption opt)
return ()
-- | Read an elisp boolean. Only NIL is treated as false, non-NIL values are
-- interpreted as true.
elispBoolean :: Monad m => OrgParser m Bool
elispBoolean = try $ do
value <- many1 nonspaceChar
return $ case map toLower value of
"nil" -> False
"{}" -> False
"()" -> False
_ -> True
-- | Try to parse a literal string as the option value. Returns the
-- string on success.
optionString :: Monad m => Text -> OrgParser m Text
optionString s = try $ do
_ <- string (unpack s)
lookAhead (newline <|> spaceChar)
return s
|
