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Provide help message. #45

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Merged
merged 3 commits into from
Apr 11, 2022
Merged

Provide help message. #45

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8adfffb
If -h or --help is given then print helpful message and exit.
PaulJohnson Apr 10, 2022
c6ecccd
Corrected format in error message.
PaulJohnson Apr 10, 2022
0c336ba
Ormolu formatted.
PaulJohnson Apr 11, 2022
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16 changes: 14 additions & 2 deletions app/Main.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,9 @@ import Hie.Locate
import Hie.Yaml
import System.Directory
import System.Environment
import System.Exit
import System.FilePath.Posix
import System.IO

main :: IO ()
main = do
Expand All @@ -19,8 +21,8 @@ main = do
"cabal" -> cabalPkgs pwd
_ -> stackYamlPkgs pwd
when (null cfs) $
error $
"Used" <> name
die $
"Used " <> name
<> "\n No .cabal files found under"
<> pwd
<> "\n You may need to run stack build."
Expand All @@ -31,6 +33,16 @@ resolveName :: FilePath -> IO String
resolveName pwd = do
args <- getArgs
files <- listDirectory pwd
when ("--help" `elem` args || "-h" `elem` args) $ do
progName <- getProgName
hPutStrLn stderr $
"Usage: " <> progName
<> " [ --cabal | --stack ]\n\n\
\If neither argument is given then "
<> progName
<> " will infer the type by\n\
\looking for dist-newstyle, .stack-work, cabal.project and stack.yaml in that order."
exitSuccess
let fileNames = map takeFileName files
name =
if
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