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cli: be more robust at finding hledger-* add-ons

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Previously executables with eg digits in their name were ignored.
It now finds all files beginning with hledger-, optionally ending with
.hs or .lhs, and with no other dots in the name.
As before, we don't check for executable permission (performance ?).
This commit is contained in:
Simon Michael 2014-02-27 11:40:41 -08:00
parent 8d3161f6d6
commit bab6ec041b
1 changed files with 9 additions and 6 deletions
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15
hledger/Hledger/Cli/Options.hs
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@ -554,22 +554,25 @@ getHledgerExesInPath :: IO [String]
getHledgerExesInPath = do
pathdirs <- splitOn ":" `fmap` getEnvSafe "PATH"
pathfiles <- concat `fmap` mapM getDirectoryContentsSafe pathdirs
let hledgernamed = nub $ sort $ filter isHledgerNamed pathfiles
let hledgernamed = nub $ sort $ filter isHledgerExeName pathfiles
-- hledgerexes <- filterM isExecutable hledgernamed
return hledgernamed
-- isExecutable f = getPermissions f >>= (return . executable)
isHledgerNamed = isRight . parsewith (do
isHledgerExeName = isRight . parsewith hledgerexenamep
where
hledgerexenamep = do
string progname
char '-'
many1 (letter <|> char '-')
optional $ (string ".hs" <|> string ".lhs")
many1 (noneOf ".")
optional (string ".hs" <|> string ".lhs")
eof
)
getEnvSafe v = getEnv v `C.catch` (\(_::C.IOException) -> return "")
getDirectoryContentsSafe d = getDirectoryContents d `C.catch` (\(_::C.IOException) -> return [])
getDirectoryContentsSafe d =
(filter (not . (`elem` [".",".."])) `fmap` getDirectoryContents d) `C.catch` (\(_::C.IOException) -> return [])
-- | Raise an error, showing the specified message plus a hint about --help.
optserror = error' . (++ " (run with --help for usage)")