Adding org backend.

1 files changed, 282 insertions, 166 deletions

diff --git a/haddock-api/src/Haddock/Options.hs b/haddock-api/src/Haddock/Options.hs
index aa10b5b3..0feca92b 100644
--- a/haddock-api/src/Haddock/Options.hs
+++ b/haddock-api/src/Haddock/Options.hs
@@ -46,18 +46,23 @@ module Haddock.Options (
 import qualified Data.Char as Char
 import           Data.Version
 import           Control.Applicative
+import qualified Data.Char                     as Char
+import           Data.Version
+import           GHC                            ( Module
+                                                , moduleUnit
+                                                )
 import           GHC.Data.FastString
-import           GHC ( Module, moduleUnit )
 import           GHC.Unit.State
 import           Haddock.Types
 import           Haddock.Utils
 import           System.Console.GetOpt
-import qualified Text.ParserCombinators.ReadP as RP
+import qualified Text.ParserCombinators.ReadP  as RP
 
 
 data Flag
   = Flag_BuiltInThemes
   | Flag_CSS String
+  | Flag_Org
 --  | Flag_DocBook
   | Flag_ReadInterface String
   | Flag_DumpInterface String
@@ -119,119 +124,231 @@ data Flag
 
 options :: Bool -> [OptDescr Flag]
 options backwardsCompat =
-  [
-    Option ['B']  []     (ReqArg Flag_GhcLibDir "DIR")
-      "path to a GHC lib dir, to override the default path",
-    Option ['o']  ["odir"]     (ReqArg Flag_OutputDir "DIR")
-      "directory in which to put the output files",
-    Option ['l']  ["lib"]         (ReqArg Flag_Lib "DIR")
-      "location of Haddock's auxiliary files",
-    Option ['i'] ["read-interface"] (ReqArg Flag_ReadInterface "FILE")
-      "read an interface from FILE",
-    Option ['D']  ["dump-interface"] (ReqArg Flag_DumpInterface "FILE")
-      "write the resulting interface to FILE",
-    Option []     ["show-interface"] (ReqArg Flag_ShowInterface "FILE")
-      "print the interface in a human readable form",
+  [ Option ['B']
+           []
+           (ReqArg Flag_GhcLibDir "DIR")
+           "path to a GHC lib dir, to override the default path"
+  , Option ['o']
+           ["odir"]
+           (ReqArg Flag_OutputDir "DIR")
+           "directory in which to put the output files"
+  , Option ['l']
+           ["lib"]
+           (ReqArg Flag_Lib "DIR")
+           "location of Haddock's auxiliary files"
+  , Option ['i']
+           ["read-interface"]
+           (ReqArg Flag_ReadInterface "FILE")
+           "read an interface from FILE"
+  , Option ['D']
+           ["dump-interface"]
+           (ReqArg Flag_DumpInterface "FILE")
+           "write the resulting interface to FILE"
+  , Option []
+           ["show-interface"]
+           (ReqArg Flag_ShowInterface "FILE")
+           "print the interface in a human readable form"
+  ,
 --    Option ['S']  ["docbook"]  (NoArg Flag_DocBook)
 --  "output in DocBook XML",
-    Option ['h']  ["html"]     (NoArg Flag_Html)
-      "output in HTML (XHTML 1.0)",
-    Option []  ["latex"]  (NoArg Flag_LaTeX) "use experimental LaTeX rendering",
-    Option []  ["latex-style"]  (ReqArg Flag_LaTeXStyle "FILE") "provide your own LaTeX style in FILE",
-    Option []  ["mathjax"]  (ReqArg Flag_Mathjax "URL") "URL FOR mathjax",
-    Option ['U'] ["use-unicode"] (NoArg Flag_UseUnicode) "use Unicode in HTML output",
-    Option []  ["hoogle"]     (NoArg Flag_Hoogle)
-      "output for Hoogle; you may want --package-name and --package-version too",
-    Option [] ["quickjump"] (NoArg Flag_QuickJumpIndex)
-      "generate an index for interactive documentation navigation",
-    Option [] ["hyperlinked-source"] (NoArg Flag_HyperlinkedSource)
-      "generate highlighted and hyperlinked source code (for use with --html)",
-    Option [] ["source-css"] (ReqArg Flag_SourceCss "FILE")
-      "use custom CSS file instead of default one in hyperlinked source",
-    Option []  ["source-base"]   (ReqArg Flag_SourceBaseURL "URL")
-      "URL for a source code link on the contents\nand index pages",
-    Option ['s'] (if backwardsCompat then ["source", "source-module"] else ["source-module"])
-      (ReqArg Flag_SourceModuleURL "URL")
-      "URL for a source code link for each module\n(using the %{FILE} or %{MODULE} vars)",
-    Option []  ["source-entity"]  (ReqArg Flag_SourceEntityURL "URL")
-      "URL for a source code link for each entity\n(using the %{FILE}, %{MODULE}, %{NAME},\n%{KIND} or %{LINE} vars)",
-    Option []  ["source-entity-line"] (ReqArg Flag_SourceLEntityURL "URL")
-      "URL for a source code link for each entity.\nUsed if name links are unavailable, eg. for TH splices.",
-    Option []  ["comments-base"]   (ReqArg Flag_WikiBaseURL "URL")
-      "URL for a comments link on the contents\nand index pages",
-    Option [] ["base-url"] (ReqArg Flag_BaseURL "URL")
-      "Base URL for static assets (eg. css, javascript, json files etc.).\nWhen given statis assets will not be copied.",
-    Option []  ["comments-module"]  (ReqArg Flag_WikiModuleURL "URL")
-      "URL for a comments link for each module\n(using the %{MODULE} var)",
-    Option []  ["comments-entity"]  (ReqArg Flag_WikiEntityURL "URL")
-      "URL for a comments link for each entity\n(using the %{FILE}, %{MODULE}, %{NAME},\n%{KIND} or %{LINE} vars)",
-    Option ['c']  ["css", "theme"] (ReqArg Flag_CSS "PATH")
-      "the CSS file or theme directory to use for HTML output",
-    Option []  ["built-in-themes"] (NoArg Flag_BuiltInThemes)
-      "include all the built-in haddock themes",
-    Option ['p']  ["prologue"] (ReqArg Flag_Prologue "FILE")
-      "file containing prologue text",
-    Option ['t']  ["title"]    (ReqArg Flag_Heading "TITLE")
-      "page heading",
-    Option ['q']  ["qual"] (ReqArg Flag_Qualification "QUAL")
-      "qualification of names, one of \n'none' (default), 'full', 'local'\n'relative' or 'aliased'",
-    Option ['?']  ["help"]  (NoArg Flag_Help)
-      "display this help and exit",
-    Option ['V']  ["version"]  (NoArg Flag_Version)
-      "output version information and exit",
-    Option []  ["compatible-interface-versions"]  (NoArg Flag_CompatibleInterfaceVersions)
-      "output compatible interface file versions and exit",
-    Option []  ["interface-version"]  (NoArg Flag_InterfaceVersion)
-      "output interface file version and exit",
-    Option []  ["bypass-interface-version-check"] (NoArg Flag_BypassInterfaceVersonCheck)
-      "bypass the interface file version check (dangerous)",
-    Option ['v']  ["verbosity"]  (ReqArg Flag_Verbosity "VERBOSITY")
-      "set verbosity level",
-    Option [] ["use-contents"] (ReqArg Flag_UseContents "URL")
-      "use a separately-generated HTML contents page",
-    Option [] ["gen-contents"] (NoArg Flag_GenContents)
-      "generate an HTML contents from specified\ninterfaces",
-    Option [] ["use-index"] (ReqArg Flag_UseIndex "URL")
-      "use a separately-generated HTML index",
-    Option [] ["gen-index"] (NoArg Flag_GenIndex)
-      "generate an HTML index from specified\ninterfaces",
-    Option [] ["ignore-all-exports"] (NoArg Flag_IgnoreAllExports)
-      "behave as if all modules have the\nignore-exports attribute",
-    Option [] ["hide"] (ReqArg Flag_HideModule "MODULE")
-      "behave as if MODULE has the hide attribute",
-    Option [] ["show"] (ReqArg Flag_ShowModule "MODULE")
-      "behave as if MODULE does not have the hide attribute",
-    Option [] ["show-all"] (NoArg Flag_ShowAllModules)
-      "behave as if not modules have the hide attribute",
-    Option [] ["show-extensions"] (ReqArg Flag_ShowExtensions "MODULE")
-      "behave as if MODULE has the show-extensions attribute",
-    Option [] ["optghc"] (ReqArg Flag_OptGhc "OPTION")
-      "option to be forwarded to GHC",
-    Option []  ["ghc-version"]  (NoArg Flag_GhcVersion)
-      "output GHC version in numeric format",
-    Option []  ["print-ghc-path"]  (NoArg Flag_PrintGhcPath)
-      "output path to GHC binary",
-    Option []  ["print-ghc-libdir"]  (NoArg Flag_PrintGhcLibDir)
-      "output GHC lib dir",
-    Option ['w'] ["no-warnings"] (NoArg Flag_NoWarnings) "turn off all warnings",
-    Option [] ["no-tmp-comp-dir"] (NoArg Flag_NoTmpCompDir)
-      "do not re-direct compilation output to a temporary directory",
-    Option [] ["pretty-html"] (NoArg Flag_PrettyHtml)
-      "generate html with newlines and indenting (for use with --html)",
-    Option [] ["no-print-missing-docs"] (NoArg Flag_NoPrintMissingDocs)
-      "don't print information about any undocumented entities",
-    Option []  ["reexport"] (ReqArg Flag_Reexport "MOD")
-      "reexport the module MOD, adding it to the index",
-    Option [] ["package-name"] (ReqArg Flag_PackageName "NAME")
-      "name of the package being documented",
-    Option [] ["package-version"] (ReqArg Flag_PackageVersion "VERSION")
-      "version of the package being documented in usual x.y.z.w format",
-    Option []  ["since-qual"] (ReqArg Flag_SinceQualification "QUAL")
-      "package qualification of @since, one of\n'always' (default) or 'only-external'",
-    Option [] ["ignore-link-symbol"] (ReqArg Flag_IgnoreLinkSymbol "SYMBOL")
-      "name of a symbol which does not trigger a warning in case of link issue",
-    Option ['j'] [] (OptArg (\count -> Flag_ParCount (fmap read count)) "n")
-      "load modules in parallel"
+    Option ['h'] ["html"]  (NoArg Flag_Html)  "output in HTML (XHTML 1.0)"
+  , Option ['O'] ["org"]   (NoArg Flag_Org)   "output in Org"
+  , Option []    ["latex"] (NoArg Flag_LaTeX) "use experimental LaTeX rendering"
+  , Option []
+           ["latex-style"]
+           (ReqArg Flag_LaTeXStyle "FILE")
+           "provide your own LaTeX style in FILE"
+  , Option [] ["mathjax"] (ReqArg Flag_Mathjax "URL") "URL FOR mathjax"
+  , Option ['U']
+           ["use-unicode"]
+           (NoArg Flag_UseUnicode)
+           "use Unicode in HTML output"
+  , Option
+    []
+    ["hoogle"]
+    (NoArg Flag_Hoogle)
+    "output for Hoogle; you may want --package-name and --package-version too"
+  , Option []
+           ["quickjump"]
+           (NoArg Flag_QuickJumpIndex)
+           "generate an index for interactive documentation navigation"
+  , Option
+    []
+    ["hyperlinked-source"]
+    (NoArg Flag_HyperlinkedSource)
+    "generate highlighted and hyperlinked source code (for use with --html)"
+  , Option []
+           ["source-css"]
+           (ReqArg Flag_SourceCss "FILE")
+           "use custom CSS file instead of default one in hyperlinked source"
+  , Option []
+           ["source-base"]
+           (ReqArg Flag_SourceBaseURL "URL")
+           "URL for a source code link on the contents\nand index pages"
+  , Option
+    ['s']
+    (if backwardsCompat then ["source", "source-module"] else ["source-module"])
+    (ReqArg Flag_SourceModuleURL "URL")
+    "URL for a source code link for each module\n(using the %{FILE} or %{MODULE} vars)"
+  , Option
+    []
+    ["source-entity"]
+    (ReqArg Flag_SourceEntityURL "URL")
+    "URL for a source code link for each entity\n(using the %{FILE}, %{MODULE}, %{NAME},\n%{KIND} or %{LINE} vars)"
+  , Option
+    []
+    ["source-entity-line"]
+    (ReqArg Flag_SourceLEntityURL "URL")
+    "URL for a source code link for each entity.\nUsed if name links are unavailable, eg. for TH splices."
+  , Option []
+           ["comments-base"]
+           (ReqArg Flag_WikiBaseURL "URL")
+           "URL for a comments link on the contents\nand index pages"
+  , Option
+    []
+    ["base-url"]
+    (ReqArg Flag_BaseURL "URL")
+    "Base URL for static assets (eg. css, javascript, json files etc.).\nWhen given statis assets will not be copied."
+  , Option
+    []
+    ["comments-module"]
+    (ReqArg Flag_WikiModuleURL "URL")
+    "URL for a comments link for each module\n(using the %{MODULE} var)"
+  , Option
+    []
+    ["comments-entity"]
+    (ReqArg Flag_WikiEntityURL "URL")
+    "URL for a comments link for each entity\n(using the %{FILE}, %{MODULE}, %{NAME},\n%{KIND} or %{LINE} vars)"
+  , Option ['c']
+           ["css", "theme"]
+           (ReqArg Flag_CSS "PATH")
+           "the CSS file or theme directory to use for HTML output"
+  , Option []
+           ["built-in-themes"]
+           (NoArg Flag_BuiltInThemes)
+           "include all the built-in haddock themes"
+  , Option ['p']
+           ["prologue"]
+           (ReqArg Flag_Prologue "FILE")
+           "file containing prologue text"
+  , Option ['t'] ["title"] (ReqArg Flag_Heading "TITLE") "page heading"
+  , Option
+    ['q']
+    ["qual"]
+    (ReqArg Flag_Qualification "QUAL")
+    "qualification of names, one of \n'none' (default), 'full', 'local'\n'relative' or 'aliased'"
+  , Option ['?'] ["help"] (NoArg Flag_Help) "display this help and exit"
+  , Option ['V']
+           ["version"]
+           (NoArg Flag_Version)
+           "output version information and exit"
+  , Option []
+           ["compatible-interface-versions"]
+           (NoArg Flag_CompatibleInterfaceVersions)
+           "output compatible interface file versions and exit"
+  , Option []
+           ["interface-version"]
+           (NoArg Flag_InterfaceVersion)
+           "output interface file version and exit"
+  , Option []
+           ["bypass-interface-version-check"]
+           (NoArg Flag_BypassInterfaceVersonCheck)
+           "bypass the interface file version check (dangerous)"
+  , Option ['v']
+           ["verbosity"]
+           (ReqArg Flag_Verbosity "VERBOSITY")
+           "set verbosity level"
+  , Option []
+           ["use-contents"]
+           (ReqArg Flag_UseContents "URL")
+           "use a separately-generated HTML contents page"
+  , Option []
+           ["gen-contents"]
+           (NoArg Flag_GenContents)
+           "generate an HTML contents from specified\ninterfaces"
+  , Option []
+           ["use-index"]
+           (ReqArg Flag_UseIndex "URL")
+           "use a separately-generated HTML index"
+  , Option []
+           ["gen-index"]
+           (NoArg Flag_GenIndex)
+           "generate an HTML index from specified\ninterfaces"
+  , Option []
+           ["ignore-all-exports"]
+           (NoArg Flag_IgnoreAllExports)
+           "behave as if all modules have the\nignore-exports attribute"
+  , Option []
+           ["hide"]
+           (ReqArg Flag_HideModule "MODULE")
+           "behave as if MODULE has the hide attribute"
+  , Option []
+           ["show"]
+           (ReqArg Flag_ShowModule "MODULE")
+           "behave as if MODULE does not have the hide attribute"
+  , Option []
+           ["show-all"]
+           (NoArg Flag_ShowAllModules)
+           "behave as if not modules have the hide attribute"
+  , Option []
+           ["show-extensions"]
+           (ReqArg Flag_ShowExtensions "MODULE")
+           "behave as if MODULE has the show-extensions attribute"
+  , Option []
+           ["optghc"]
+           (ReqArg Flag_OptGhc "OPTION")
+           "option to be forwarded to GHC"
+  , Option []
+           ["ghc-version"]
+           (NoArg Flag_GhcVersion)
+           "output GHC version in numeric format"
+  , Option []
+           ["print-ghc-path"]
+           (NoArg Flag_PrintGhcPath)
+           "output path to GHC binary"
+  , Option []
+           ["print-ghc-libdir"]
+           (NoArg Flag_PrintGhcLibDir)
+           "output GHC lib dir"
+  , Option ['w'] ["no-warnings"] (NoArg Flag_NoWarnings) "turn off all warnings"
+  , Option []
+           ["no-tmp-comp-dir"]
+           (NoArg Flag_NoTmpCompDir)
+           "do not re-direct compilation output to a temporary directory"
+  , Option []
+           ["pretty-html"]
+           (NoArg Flag_PrettyHtml)
+           "generate html with newlines and indenting (for use with --html)"
+  , Option []
+           ["no-print-missing-docs"]
+           (NoArg Flag_NoPrintMissingDocs)
+           "don't print information about any undocumented entities"
+  , Option []
+           ["reexport"]
+           (ReqArg Flag_Reexport "MOD")
+           "reexport the module MOD, adding it to the index"
+  , Option []
+           ["package-name"]
+           (ReqArg Flag_PackageName "NAME")
+           "name of the package being documented"
+  , Option []
+           ["package-version"]
+           (ReqArg Flag_PackageVersion "VERSION")
+           "version of the package being documented in usual x.y.z.w format"
+  , Option
+    []
+    ["since-qual"]
+    (ReqArg Flag_SinceQualification "QUAL")
+    "package qualification of @since, one of\n'always' (default) or 'only-external'"
+  , Option
+    []
+    ["ignore-link-symbol"]
+    (ReqArg Flag_IgnoreLinkSymbol "SYMBOL")
+    "name of a symbol which does not trigger a warning in case of link issue"
+  , Option ['j']
+           []
+           (OptArg (\count -> Flag_ParCount (fmap read count)) "n")
+           "load modules in parallel"
   ]
 
 
@@ -239,23 +356,22 @@ getUsage :: IO String
 getUsage = do
   prog <- getProgramName
   return $ usageInfo (usageHeader prog) (options False)
-  where
-    usageHeader :: String -> String
-    usageHeader prog = "Usage: " ++ prog ++ " [OPTION...] file...\n"
+ where
+  usageHeader :: String -> String
+  usageHeader prog = "Usage: " ++ prog ++ " [OPTION...] file...\n"
 
 
 parseHaddockOpts :: [String] -> IO ([Flag], [String])
-parseHaddockOpts params =
-  case getOpt Permute (options True) params  of
-    (flags, args, []) -> return (flags, args)
-    (_, _, errors)    -> do
-      usage <- getUsage
-      throwE (concat errors ++ usage)
+parseHaddockOpts params = case getOpt Permute (options True) params of
+  (flags, args, []    ) -> return (flags, args)
+  (_    , _   , errors) -> do
+    usage <- getUsage
+    throwE (concat errors ++ usage)
 
 optPackageVersion :: [Flag] -> Maybe Data.Version.Version
 optPackageVersion flags =
   let ver = optLast [ v | Flag_PackageVersion v <- flags ]
-  in ver >>= fmap fst . optLast . RP.readP_to_S parseVersion
+  in  ver >>= fmap fst . optLast . RP.readP_to_S parseVersion
 
 optPackageName :: [Flag] -> Maybe PackageName
 optPackageName flags =
@@ -263,17 +379,15 @@ optPackageName flags =
 
 
 optTitle :: [Flag] -> Maybe String
-optTitle flags =
-  case [str | Flag_Heading str <- flags] of
-    [] -> Nothing
-    (t:_) -> Just t
+optTitle flags = case [ str | Flag_Heading str <- flags ] of
+  []      -> Nothing
+  (t : _) -> Just t
 
 
 outputDir :: [Flag] -> FilePath
-outputDir flags =
-  case [ path | Flag_OutputDir path <- flags ] of
-    []    -> "."
-    paths -> last paths
+outputDir flags = case [ path | Flag_OutputDir path <- flags ] of
+  []    -> "."
+  paths -> last paths
 
 
 optContentsUrl :: [Flag] -> Maybe String
@@ -290,23 +404,26 @@ optCssFile flags = optLast [ str | Flag_CSS str <- flags ]
 optSourceCssFile :: [Flag] -> Maybe FilePath
 optSourceCssFile flags = optLast [ str | Flag_SourceCss str <- flags ]
 
-sourceUrls :: [Flag] -> (Maybe String, Maybe String, Maybe String, Maybe String)
+sourceUrls
+  :: [Flag] -> (Maybe String, Maybe String, Maybe String, Maybe String)
 sourceUrls flags =
-  (optLast [str | Flag_SourceBaseURL    str <- flags]
-  ,optLast [str | Flag_SourceModuleURL  str <- flags]
-  ,optLast [str | Flag_SourceEntityURL  str <- flags]
-  ,optLast [str | Flag_SourceLEntityURL str <- flags])
+  ( optLast [ str | Flag_SourceBaseURL str <- flags ]
+  , optLast [ str | Flag_SourceModuleURL str <- flags ]
+  , optLast [ str | Flag_SourceEntityURL str <- flags ]
+  , optLast [ str | Flag_SourceLEntityURL str <- flags ]
+  )
 
 
 wikiUrls :: [Flag] -> (Maybe String, Maybe String, Maybe String)
 wikiUrls flags =
-  (optLast [str | Flag_WikiBaseURL   str <- flags]
-  ,optLast [str | Flag_WikiModuleURL str <- flags]
-  ,optLast [str | Flag_WikiEntityURL str <- flags])
+  ( optLast [ str | Flag_WikiBaseURL str <- flags ]
+  , optLast [ str | Flag_WikiModuleURL str <- flags ]
+  , optLast [ str | Flag_WikiEntityURL str <- flags ]
+  )
 
 
 baseUrl :: [Flag] -> Maybe String
-baseUrl flags = optLast [str | Flag_BaseURL str <- flags]
+baseUrl flags = optLast [ str | Flag_BaseURL str <- flags ]
 
 optDumpInterfaceFile :: [Flag] -> Maybe FilePath
 optDumpInterfaceFile flags = optLast [ str | Flag_DumpInterface str <- flags ]
@@ -326,31 +443,30 @@ optParCount flags = optLast [ n | Flag_ParCount n <- flags ]
 qualification :: [Flag] -> Either String QualOption
 qualification flags =
   case map (map Char.toLower) [ str | Flag_Qualification str <- flags ] of
-      []             -> Right OptNoQual
-      ["none"]       -> Right OptNoQual
-      ["full"]       -> Right OptFullQual
-      ["local"]      -> Right OptLocalQual
-      ["relative"]   -> Right OptRelativeQual
-      ["aliased"]    -> Right OptAliasedQual
-      [arg]          -> Left $ "unknown qualification type " ++ show arg
-      _:_            -> Left "qualification option given multiple times"
+    []            -> Right OptNoQual
+    [ "none"    ] -> Right OptNoQual
+    [ "full"    ] -> Right OptFullQual
+    [ "local"   ] -> Right OptLocalQual
+    [ "relative"] -> Right OptRelativeQual
+    [ "aliased" ] -> Right OptAliasedQual
+    [ arg       ] -> Left $ "unknown qualification type " ++ show arg
+    _ :         _ -> Left "qualification option given multiple times"
 
 sinceQualification :: [Flag] -> Either String SinceQual
 sinceQualification flags =
   case map (map Char.toLower) [ str | Flag_SinceQualification str <- flags ] of
-      []             -> Right Always
-      ["always"]     -> Right Always
-      ["external"]   -> Right External
-      [arg]          -> Left $ "unknown since-qualification type " ++ show arg
-      _:_            -> Left "since-qualification option given multiple times"
+    []            -> Right Always
+    [ "always"  ] -> Right Always
+    [ "external"] -> Right External
+    [ arg       ] -> Left $ "unknown since-qualification type " ++ show arg
+    _ :         _ -> Left "since-qualification option given multiple times"
 
 verbosity :: [Flag] -> Verbosity
-verbosity flags =
-  case [ str | Flag_Verbosity str <- flags ] of
-    []  -> Normal
-    x:_ -> case parseVerbosity x of
-      Left e -> throwE e
-      Right v -> v
+verbosity flags = case [ str | Flag_Verbosity str <- flags ] of
+  []    -> Normal
+  x : _ -> case parseVerbosity x of
+    Left  e -> throwE e
+    Right v -> v
 
 ignoredSymbols :: [Flag] -> [String]
 ignoredSymbols flags = [ symbol | Flag_IgnoreLinkSymbol symbol <- flags ]
@@ -387,16 +503,16 @@ optLast xs = Just (last xs)
 --
 -- The @--package-name@ and @--package-version@ Haddock flags allow the user to
 -- specify this information manually and it is returned here if present.
-modulePackageInfo :: UnitState
-                  -> [Flag] -- ^ Haddock flags are checked as they may contain
+modulePackageInfo
+  :: UnitState
+  -> [Flag] -- ^ Haddock flags are checked as they may contain
                             -- the package name or version provided by the user
                             -- which we prioritise
-                  -> Maybe Module
-                  -> (Maybe PackageName, Maybe Data.Version.Version)
+  -> Maybe Module
+  -> (Maybe PackageName, Maybe Data.Version.Version)
 modulePackageInfo _unit_state _flags Nothing = (Nothing, Nothing)
 modulePackageInfo unit_state flags (Just modu) =
-  ( optPackageName flags    <|> fmap unitPackageName pkgDb
+  ( optPackageName flags <|> fmap unitPackageName pkgDb
   , optPackageVersion flags <|> fmap unitPackageVersion pkgDb
   )
-  where
-    pkgDb = lookupUnit unit_state (moduleUnit modu)
+  where pkgDb = lookupUnit unit_state (moduleUnit modu)