{-|

Module : $Header$

Copyright : (c) Martin K�hl, Christian Maeder, Uni Bremen 2002-2005

Licence : similar to LGPL, see HetCATS/LICENCE.txt or LIZENZ.txt

Maintainer : hets@tzi.de

Stability : provisional

Portability : portable

Datatypes for options that hets understands.

Useful functions to parse and check user-provided values.

-}

{- Maybe TODO:

-- an Error should be raised when more than one OutDir were specified,

or when the OutDir wasn't approved sane

-}

module Driver.Options

( defaultHetcatsOpts

, showDiags

, showDiags1

, guess

, existsAnSource

, checkRecentEnv

, checkEitherDirOrExFile

, doIfVerbose

, putIfVerbose

, hetcatsOpts

, HetcatsOpts(..)

, GuiType(..)

, InType(..)

, AnaType(..)

, RawOpt(..)

, OutType(..)

, WebType(..)

, HetOutFormat(..)

, HetOutType(..)

, PrettyType(..)

) where

import Driver.Version

import Common.Utils

import Common.Result

import Common.Amalgamate(CASLAmalgOpt(..))

import System.Directory

import System.IO.Error

import System.Exit

import Data.List

import Control.Monad (filterM)

import System.Console.GetOpt

bracket :: String -> String

bracket s = "[" ++ s ++ "]"

-- use the same strings for parsing and printing!

verboseS, intypeS, outtypesS, rawS, skipS, structS,

guiS, onlyGuiS, libdirS, outdirS, amalgS, webS :: String

verboseS = "verbose"

intypeS = "input-type"

outtypesS = "output-types"

rawS = "raw"

skipS = "just-parse"

structS = "just-structured"

guiS = "gui"

onlyGuiS = "only-gui"

libdirS = "hets-libdir"

outdirS = "output-dir"

amalgS = "casl-amalg"

webS = "web"

asciiS, latexS, textS, texS :: String

asciiS = "ascii"

latexS = "latex"

textS = "text"

texS = "tex"

genTermS, treeS, bafS, astS :: String

genTermS = "gen_trm"

treeS = "tree."

bafS = ".baf"

astS = "ast"

graphS, ppS, envS, naxS, dS :: String

graphS = "graph."

ppS = "pp."

envS = "env"

naxS = ".nax"

dS = "."

showOpt :: String -> String

showOpt s = if null s then "" else " --" ++ s

showEqOpt :: String -> String -> String

showEqOpt k s = if null s then "" else showOpt k ++ "=" ++ s

-- main Datatypes --

-- | 'HetcatsOpts' is a record of all options received from the command line

data HetcatsOpts = -- for comments see usage info

HcOpt { analysis :: AnaType

, gui :: GuiType

, infiles :: [FilePath] -- files to be read

, intype :: InType

, libdir :: FilePath

, outdir :: FilePath

, outtypes :: [OutType]

, rawopts :: [RawOpt]

, verbose :: Int

, defLogic :: String

, web :: WebType

, outputToStdout :: Bool -- flag: output diagnostic messages?

, caslAmalg :: [CASLAmalgOpt]

}

instance Show HetcatsOpts where

show opts = showEqOpt verboseS (show $ verbose opts)

++ show (gui opts)

++ show (analysis opts)

++ show (web opts)

++ showEqOpt libdirS (libdir opts)

++ showEqOpt intypeS (show $ intype opts)

++ showEqOpt outdirS (outdir opts)

++ showEqOpt outtypesS (showOutTypes $ outtypes opts)

++ showRaw (rawopts opts)

++ showEqOpt amalgS ( tail $ init $ show $

case caslAmalg opts of

[] -> [NoAnalysis]

l -> l)

++ " " ++ showInFiles (infiles opts)

where

showInFiles = joinWith ' '

showOutTypes = joinWith ',' . map show

showRaw = joinWith ' ' . map show

-- | 'makeOpts' includes a parsed Flag in a set of HetcatsOpts

makeOpts :: HetcatsOpts -> Flag -> HetcatsOpts

makeOpts opts (Analysis x) = opts { analysis = x }

makeOpts opts (Gui x) = opts { gui = x }

makeOpts opts (InType x) = opts { intype = x }

makeOpts opts (LibDir x) = opts { libdir = x }

makeOpts opts (OutDir x) = opts { outdir = x }

makeOpts opts (OutTypes x) = opts { outtypes = x }

makeOpts opts (Raw x) = opts { rawopts = x }

makeOpts opts (Web x) = opts { web = x }

makeOpts opts (Verbose x) = opts { verbose = x }

makeOpts opts (DefaultLogic x) = opts { defLogic = x }

makeOpts opts (CASLAmalg x) = opts { caslAmalg = x }

makeOpts opts Quiet = opts { verbose = 0 }

makeOpts opts Help = opts -- skipped

makeOpts opts Version = opts -- skipped

-- | 'defaultHetcatsOpts' defines the default HetcatsOpts, which are used as

-- basic values when the user specifies nothing else

defaultHetcatsOpts :: HetcatsOpts

defaultHetcatsOpts =

HcOpt { analysis = Basic

, gui = Not

, web = NoWeb

, infiles = []

, intype = GuessIn

, libdir = ""

, outdir = ""

, outtypes = [defaultOutType]

-- better default options, but not implemented yet:

--, outtypes = [HetCASLOut OutASTree OutXml]

, rawopts = []

, defLogic = "CASL"

, verbose = 1

, outputToStdout = True

, caslAmalg = [Cell]

}

defaultOutType :: OutType

defaultOutType = HetCASLOut OutASTree OutAscii

-- | every 'Flag' describes an option (see usage info)

data Flag = Analysis AnaType

| Gui GuiType

| Help

| InType InType

| LibDir FilePath

| OutDir FilePath

| OutTypes [OutType]

| Quiet

| Raw [RawOpt]

| Verbose Int

| Version

| Web WebType

| DefaultLogic String

| CASLAmalg [CASLAmalgOpt]

-- | 'AnaType' describes the type of analysis to be performed

data AnaType = Basic | Structured | Skip

instance Show AnaType where

show a = case a of

Basic -> ""

Structured -> showOpt structS

Skip -> showOpt skipS

-- | 'GuiType' determines if we want the GUI shown

data GuiType = Only | Also | Not

instance Show GuiType where

show g = case g of

Only -> showOpt onlyGuiS

Also -> showOpt guiS

Not -> ""

-- | 'InType' describes the type of input the infile contains

data InType = ATermIn ATType | ASTreeIn ATType | CASLIn | WebIn | HetCASLIn

| HaskellIn | GuessIn

instance Show InType where

show i = case i of

ATermIn at -> genTermS ++ show at

ASTreeIn at -> astS ++ show at

CASLIn -> "casl"

WebIn -> "web"

HetCASLIn -> "het"

HaskellIn -> "hs"

GuessIn -> ""

-- maybe this optional tree prefix can be omitted

instance Read InType where

readsPrec _ s = let f = filter ( \ o -> (case o of

ATermIn _ -> isPrefixOf (treeS ++ show o) s

_ -> False) || isPrefixOf (show o) s)

(plainInTypes ++ aInTypes)

in case f of

[] -> []

t : _ -> [(t, drop (length (show t) +

case t of

ATermIn _ -> if isPrefixOf treeS s

then length treeS else 0

_ -> 0) s)]

-- | 'ATType' describes distinct types of ATerms

data ATType = BAF | NonBAF

instance Show ATType where

show a = case a of BAF -> bafS

NonBAF -> ""

plainInTypes :: [InType]

plainInTypes = [CASLIn, HetCASLIn, HaskellIn, WebIn]

aInTypes :: [InType]

aInTypes = [ f x | f <- [ASTreeIn, ATermIn], x <- [BAF, NonBAF] ]

-- | 'OutType' describes the type of outputs that we want to generate

data OutType = PrettyOut PrettyType

| HetCASLOut HetOutType HetOutFormat

| GraphOut GraphType

| EnvOut

instance Show OutType where

show o = case o of

PrettyOut p -> ppS ++ show p

HetCASLOut h f -> show h ++ dS ++ show f

GraphOut f -> graphS ++ show f

EnvOut -> envS

instance Read OutType where

readsPrec _ s = if isPrefixOf ppS s then

case reads $ drop (length ppS) s of

[(p, r)] -> [(PrettyOut p, r)]

_ -> hetsError (s ++ " expected one of " ++ show prettyList)

else if isPrefixOf graphS s then

case reads $ drop (length graphS) s of

[(t, r)] -> [(GraphOut t, r)]

_ -> hetsError (s ++ " expected one of " ++ show graphList)

else if isPrefixOf envS s then

[(EnvOut, drop (length envS) s)]

else [(HetCASLOut h f, u) | (h, d : t) <- reads s,

d == '.' , (f, u) <- reads t]

-- | 'PrettyType' describes the type of output we want the pretty-printer

-- to generate

data PrettyType = PrettyAscii | PrettyLatex | PrettyHtml

instance Show PrettyType where

show p = case p of

PrettyAscii -> "het"

PrettyLatex -> "tex"

PrettyHtml -> "html"

instance Read PrettyType where

readsPrec _ = readShow prettyList

prettyList :: [PrettyType]

prettyList = [PrettyAscii, PrettyLatex, PrettyHtml]

-- | 'HetOutType' describes the type of Output we want Hets to create

data HetOutType = OutASTree | OutDGraph Flattening Bool

instance Show HetOutType where

show h = case h of

OutASTree -> astS

OutDGraph f b -> show f ++ "dg" ++ if b then naxS else ""

instance Read HetOutType where

readsPrec _ s = if isPrefixOf astS s then

[(OutASTree, drop (length astS) s)]

else case readShow outTypeList s of

l@[(OutDGraph f _, r)] -> if isPrefixOf naxS r then

[(OutDGraph f True, drop (length naxS) r)]

else l

_ -> hetsError (s ++ " is not a valid OTYPE")

outTypeList :: [HetOutType]

outTypeList = [ OutDGraph f False | f <- [ Flattened, HidingOutside, Full]]

-- | 'Flattening' describes how flat the Earth really is (TODO: add comment)

data Flattening = Flattened | HidingOutside | Full

instance Show Flattening where

show f = case f of

Flattened -> "f"

HidingOutside -> "h"

Full -> ""

-- | 'HetOutFormat' describes the format of Output that HetCASL shall create

data HetOutFormat = OutAscii | OutTerm | OutTaf | OutHtml | OutXml

instance Show HetOutFormat where

show f = case f of

OutAscii -> "het"

OutTerm -> "trm"

OutTaf -> "taf"

OutHtml -> "html"

OutXml -> "xml"

instance Read HetOutFormat where

readsPrec _ = readShow formatList

formatList :: [HetOutFormat]

formatList = [OutAscii, OutTerm, OutTaf, OutHtml, OutXml]

-- | 'GraphType' describes the type of Graph that we want generated

data GraphType = Dot | PostScript | Davinci

instance Show GraphType where

show g = case g of

Dot -> "dot"

PostScript -> "ps"

Davinci -> "davinci"

instance Read GraphType where

readsPrec _ = readShow graphList

graphList :: [GraphType]

graphList = [Dot, PostScript, Davinci]

-- | 'WebType'

data WebType = WebType | NoWeb -- compare with WebIn?!

instance Show WebType where

show w = case w of

WebType -> showOpt webS

NoWeb -> ""

-- | 'RawOpt' describes the options we want to be passed to the Pretty-Printer

data RawOpt = RawAscii String | RawLatex String

instance Show RawOpt where

show r = case r of

RawAscii s -> showRawOpt asciiS s

RawLatex s -> showRawOpt latexS s

where showRawOpt f = showEqOpt (rawS ++ "=" ++ f)

instance Show CASLAmalgOpt where

show o = case o of

Sharing -> "sharing"

ColimitThinness -> "colimit-thinness"

Cell -> "cell"

NoAnalysis -> "none"

instance Read CASLAmalgOpt where

readsPrec _ = readShow caslAmalgOpts

readShow :: Show a => [a] -> ReadS a

readShow l s = case find ( \ o -> isPrefixOf (show o) s) l of

Nothing -> []

Just t -> [(t, drop (length $ show t) s)]

-- | possible CASL amalgamability options

caslAmalgOpts :: [CASLAmalgOpt]

caslAmalgOpts = [NoAnalysis, Sharing, Cell, ColimitThinness]

-- | 'options' describes all available options and is used to generate usage

-- information

options :: [OptDescr Flag]

options =

[ Option ['v'] [verboseS] (OptArg parseVerbosity "Int")

"set verbosity level, -v1 is the default"

, Option ['q'] ["quiet"] (NoArg Quiet)

"same as -v0, no output at all to stdout"

, Option ['V'] ["version"] (NoArg Version)

"print version number and exit"

, Option ['h'] ["help", "usage"] (NoArg Help)

"print usage information and exit"

, Option ['g'] [guiS] (NoArg (Gui Also))

"show graphical output in a GUI window"

, Option ['G'] [onlyGuiS] (NoArg $ Gui Only)

"like -g but write no output files"

, Option ['w'] [webS] (NoArg (Web WebType))

"show web interface"

, Option ['p'] [skipS] (NoArg $ Analysis Skip)

"skip static analysis, just parse"

, Option ['s'] [structS] (NoArg $ Analysis Structured)

"skip basic, just do structured analysis"

, Option ['l'] ["logic"] (ReqArg DefaultLogic "LOGIC")

"choose initial logic, the default is CASL"

, Option ['L'] [libdirS] (ReqArg LibDir "DIR")

"source directory of [Het]CASL libraries"

, Option ['i'] [intypeS] (ReqArg parseInType "ITYPE")

("input file type can be one of:" ++ crS ++ joinBar

(map show plainInTypes ++

map (++ bracket bafS) [astS, bracket treeS ++ genTermS]))

, Option ['O'] [outdirS] (ReqArg OutDir "DIR")

"destination directory for output files"

, Option ['o'] [outtypesS] (ReqArg parseOutTypes "OTYPES")

("output file types, default " ++ show defaultOutType ++ "," ++ crS ++

listS ++ crS ++ bS ++ envS ++ crS ++ bS ++

ppS ++ joinBar (map show prettyList) ++ crS ++ bS ++

graphS ++ joinBar (map show graphList) ++ crS ++ bS ++

astS ++ formS ++ crS ++ bS ++

joinBar (map show outTypeList) ++ bracket naxS ++ formS)

, Option ['r'] [rawS] (ReqArg parseRawOpts "RAW")

("raw options for pretty printing" ++ crS ++ "RAW is "

++ joinBar [asciiS, textS, latexS, texS]

++ "=STRING where " ++ crS ++

"STRING is passed to the appropriate printer")

, Option ['a'] [amalgS] (ReqArg parseCASLAmalg "ANALYSIS")

("CASL amalgamability analysis options" ++ crS ++ listS ++

crS ++ joinBar (map show caslAmalgOpts))

] where listS =

"is a comma-separated list without blanks of one or more from:"

crS = "\n\t\t"

bS = "| "

joinBar l = "(" ++ joinWith '|' l ++ ")"

formS = dS ++ joinBar (map show formatList)

-- parser functions returning Flags --

-- | 'parseVerbosity' parses a 'Verbose' Flag from user input

parseVerbosity :: (Maybe String) -> Flag

parseVerbosity Nothing = Verbose 2

parseVerbosity (Just s)

= case reads s of

[(i,"")] -> Verbose i

_ -> hetsError (s ++ " is not a valid INT")

-- | intypes useable for downloads

downloadExtensions :: [String]

downloadExtensions = map show plainInTypes

-- |

-- checks if a source file for the given base exists

existsAnSource :: FilePath -> IO (Maybe FilePath)

existsAnSource base2 =

do

let names = map (base2++) ("":(map (dS ++) downloadExtensions))

-- look for the first existing file

existFlags <- sequence (map doesFileExist names)

return (find fst (zip existFlags names) >>= (return . snd))

-- |

-- gets two Paths and checks if the first file is more recent than the

-- second one

checkRecentEnv :: FilePath -> FilePath -> IO Bool

checkRecentEnv fp1 base2 =

do fp1_exists <- doesFileExist fp1

if not fp1_exists then return False

else do

maybe_source_file <- existsAnSource base2

maybe (return False)

(\ fp2 -> do fp1_time <- getModificationTime fp1

fp2_time <- getModificationTime fp2

return (fp1_time > fp2_time))

maybe_source_file

-- |

-- gets a FilePath and checks whether it is a directory or an executable File;

-- * Just True: it is a dir

--

-- * Just False: it is an executable file

--

-- * Nothing: it is nothing of the two above

--

-- /Warning: Not compatible with GUI.hets_cgi.hs/

checkEitherDirOrExFile :: FilePath -> IO (Maybe Bool)

checkEitherDirOrExFile fp =

do isDir <- doesDirectoryExist fp

(isRead,isExec,isSearch) <- catch getPerms errs

return (if isDir && isSearch && isRead

then Just True

else if isRead && isExec

then Just False

else Nothing)

where getPerms = do p <- getPermissions fp

return (readable p,

executable p,

searchable p)

errs ex

| isPermissionError ex ||

isDoesNotExistError ex = return (False,False,False)

| otherwise = ioError ex

-- | 'parseInType' parses an 'InType' Flag from user input

parseInType :: String -> Flag

parseInType = InType . parseInType1

-- | 'parseInType1' parses an 'InType' Flag from a String

parseInType1 :: String -> InType

parseInType1 str =

case reads str of

[(t, "")] -> t

_ -> hetsError (str ++ " is not a valid ITYPE")

{- the mere typo read instead of reads caused the runtime error:

Fail: Prelude.read: no parse -}

-- 'parseOutTypes' parses an 'OutTypes' Flag from user input

parseOutTypes :: String -> Flag

parseOutTypes str = case reads $ bracket str of

[(l, "")] -> OutTypes l

_ -> hetsError (str ++ " is not a valid OTYPES")

-- | 'parseRawOpts' parses a 'Raw' Flag from user input

parseRawOpts :: String -> Flag

parseRawOpts s =

let (prefix, string) = break (== '=') s

parsePrefix p = if p `elem` [asciiS, textS] then RawAscii

else if p `elem` [latexS, texS] then RawLatex

else hetsError (s ++ " is not a valid RAW String")

in Raw [(parsePrefix prefix) (drop 1 string)]

-- | guesses the InType

guess :: String -> InType -> InType

guess file GuessIn = guessInType file

guess _file itype = itype

-- | 'guessInType' parses an 'InType' from the FilePath to our 'InFile'

guessInType :: FilePath -> InType

guessInType file =

case fileparse (map show (plainInTypes ++ aInTypes) ++

map ( \ t -> treeS ++ show t)

[ ATermIn x | x <- [BAF, NonBAF]])

file of

(_,_,Just suf) -> parseInType1 suf

(_,_,Nothing) -> hetsError $

"InType of " ++ file ++ " unclear, please specify"

-- | 'parseCASLAmalg' parses CASL amalgamability options

parseCASLAmalg :: String -> Flag

parseCASLAmalg str =

case reads $ bracket str of

[(l, "")] -> CASLAmalg $ filter ( \ o -> case o of

NoAnalysis -> False

_ -> True ) l

_ -> hetsError (str ++

" is not a valid CASL amalgamability analysis option list")

-- main functions --

-- | 'hetcatsOpts' parses sensible HetcatsOpts from ARGV

hetcatsOpts :: [String] -> IO HetcatsOpts

hetcatsOpts argv =

let argv' = filter (not . isUni) argv

isUni s = take 5 s == "--uni"

in case (getOpt Permute options argv') of

(opts,non_opts,[]) ->

do flags <- checkFlags opts

infs <- checkInFiles non_opts

hcOpts <- return $

foldr (flip makeOpts) defaultHetcatsOpts flags

let hcOpts' = hcOpts { infiles = infs }

seq (length $ show hcOpts') $ return $ hcOpts'

(_,_,errs) -> hetsError (concat errs)

-- | 'checkFlags' checks all parsed Flags for sanity

checkFlags :: [Flag] -> IO [Flag]

checkFlags fs =

let collectFlags = (collectOutDirs

. collectOutTypes

. collectVerbosity

. collectRawOpts

-- collect some more here?

)

in do if not $ null [ () | Help <- fs]

then do putStrLn hetsUsage

exitWith ExitSuccess

else return [] -- fall through

if not $ null [ () | Version <- fs]

then do putStrLn ("version of hets: " ++ hetcats_version)

exitWith ExitSuccess

else return [] -- fall through

fs' <- collectFlags fs

return fs'

-- | 'checkInFiles' checks all given InFiles for sanity

checkInFiles :: [String] -> IO [FilePath]

checkInFiles fs =

do ifs <- filterM checkInFile fs

case ifs of

[] -> return (hetsError "No valid input file specified")

xs -> return xs

-- auxiliary functions: FileSystem interaction --

-- | 'checkInFile' checks a single InFile for sanity

checkInFile :: FilePath -> IO Bool

checkInFile file =

do exists <- doesFileExist file

perms <- catch (getPermissions file) (\_ -> return noPerms)

return (exists && (readable perms))

-- | 'checkOutDirs' checks a list of OutDir for sanity

checkOutDirs :: [Flag] -> IO [Flag]

checkOutDirs fs =

do ods <- ((filterM checkOutDir)

. (map (\(OutDir x) -> x))) fs

if null ods

then return []

else return $ [OutDir $ head ods]

-- | 'checkOutDir' checks a single OutDir for sanity

checkOutDir :: String -> IO Bool

checkOutDir file =

do exists <- doesDirectoryExist file

perms <- catch (getPermissions file) (\_ -> return noPerms)

return (exists && (writable perms))

-- Nil Permissions. Returned, if an Error occurred in FS-Interaction

noPerms :: Permissions

noPerms = Permissions { readable = False

, writable = False

, executable = False

, searchable = False

}

-- auxiliary functions: collect flags --

collectOutDirs :: [Flag] -> IO [Flag]

collectOutDirs fs =

let (ods,fs') = partition isOutDir fs

isOutDir (OutDir _) = True

isOutDir _ = False

in do ods' <- checkOutDirs ods

return $ ods' ++ fs'

collectVerbosity :: [Flag] -> [Flag]

collectVerbosity fs =

let (vs,fs') = partition isVerb fs

verbosity = (sum . map (\(Verbose x) -> x)) vs

isVerb (Verbose _) = True

isVerb _ = False

vfs = Verbose verbosity : fs'

in if not $ null [() | Quiet <- fs'] then Verbose 0 : fs' else

if null vs then Verbose 1 : fs' else vfs

collectOutTypes :: [Flag] -> [Flag]

collectOutTypes fs =

let (ots,fs') = partition isOType fs

isOType (OutTypes _) = True

isOType _ = False

otypes = foldl concatOTypes [] ots

concatOTypes = (\os (OutTypes ot) -> os ++ ot)

in if null otypes || not (null [() | Gui Only <- fs'])

then fs'

else ((OutTypes otypes):fs')

collectRawOpts :: [Flag] -> [Flag]

collectRawOpts fs =

let (rfs,fs') = partition isRawOpt fs

isRawOpt (Raw _) = True

isRawOpt _ = False

raws = foldl concatRawOpts [] rfs

concatRawOpts = (\os (Raw ot) -> os ++ ot)

in if (null raws) then fs' else ((Raw raws):fs')

-- auxiliary functions: error messages --

-- | 'hetsError' is a generic Error messaging function that prints the Error

-- and usage information, if the user caused the Error

hetsError :: String -> a

hetsError errorString = error (errorString ++ "\n" ++ hetsUsage)

-- | 'hetsUsage' generates usage information for the commandline

hetsUsage :: String

hetsUsage = usageInfo header options

where header = "Usage: hets [OPTION...] file ... file"

-- | 'putIfVerbose' prints a given String to StdOut when the given HetcatsOpts'

-- Verbosity exceeds the given level

putIfVerbose :: HetcatsOpts -> Int -> String -> IO ()

putIfVerbose opts level str =

if outputToStdout opts

then doIfVerbose opts level (putStrLn str)

else return()

-- | 'doIfVerbose' executes a given function when the given HetcatsOpts'

-- Verbosity exceeds the given level

doIfVerbose :: HetcatsOpts -> Int -> (IO ()) -> IO ()

doIfVerbose opts level func =

if (verbose opts) >= level then func

else return ()

-- | show diagnostic messages (see Result.hs), according to verbosity level

showDiags :: HetcatsOpts -> [Diagnosis] -> IO()

showDiags opts ds = do

ioresToIO $ showDiags1 opts $ resToIORes $ Result ds Nothing

return ()

-- | show diagnostic messages (see Result.hs), according to verbosity level

showDiags1 :: HetcatsOpts -> IOResult a -> IOResult a

showDiags1 opts res = do

if outputToStdout opts

then do Result ds res' <- ioToIORes $ ioresToIO res

ioToIORes $ sequence $ map (putStrLn . show) -- take maxdiags

$ filter (relevantDiagKind . diagKind) ds

case res' of

Just res'' -> return res''

Nothing -> resToIORes $ Result [] Nothing

else res

where relevantDiagKind Error = True

relevantDiagKind Warning = (verbose opts) >= 2

relevantDiagKind Hint = (verbose opts) >= 4

relevantDiagKind Debug = (verbose opts) >= 5

relevantDiagKind MessageW = False