| Safe Haskell | None |
|---|---|
| Language | Haskell98 |
Data.Fortune
- data FortuneFile
- fortuneFilePath :: FortuneFile -> FilePath
- fortuneIndexPath :: FortuneFile -> FilePath
- openFortuneFile :: Char -> Bool -> FilePath -> IO FortuneFile
- closeFortuneFile :: FortuneFile -> IO ()
- getIndex :: FortuneFile -> IO Index
- rebuildIndex :: FortuneFile -> IO ()
- getFortune :: FortuneFile -> Int -> IO Text
- getFortunes :: FortuneFile -> IO [Text]
- getNumFortunes :: FortuneFile -> IO Int
- appendFortune :: FortuneFile -> Text -> IO ()
- data Index
- openIndex :: FilePath -> Bool -> IO Index
- createVirtualIndex :: IO Index
- closeIndex :: Index -> IO ()
- getStats :: Index -> IO FortuneStats
- data StatsProblem
- data HeaderProblem
- data IndexProblem
- checkIndex :: Index -> IO (Maybe IndexProblem)
- data IndexEntry = IndexEntry {
- stringOffset :: !Int
- stringBytes :: !Int
- stringChars :: !Int
- stringLines :: !Int
- indexEntryStats :: IndexEntry -> FortuneStats
- getEntries :: Index -> IO (Vector IndexEntry)
- getEntry :: Index -> Int -> IO IndexEntry
- unfoldEntries :: Index -> IO (Maybe IndexEntry) -> IO ()
- appendEntries :: Index -> Vector IndexEntry -> IO ()
- appendEntry :: Index -> IndexEntry -> IO ()
- clearIndex :: Index -> IO ()
- rebuildStats :: Index -> IO ()
- data FortuneStats
- numFortunes :: FortuneStats -> Int
- minChars :: FortuneStats -> Int
- maxLines :: FortuneStats -> Int
- minLines :: FortuneStats -> Int
- maxChars :: FortuneStats -> Int
- listFortuneFiles :: Bool -> FilePath -> IO [FilePath]
- listFortuneFilesIn :: [(FilePath, Bool)] -> IO [FilePath]
- findFortuneFile :: Bool -> FilePath -> String -> IO [FilePath]
- findFortuneFileIn :: [(String, Bool)] -> String -> IO [FilePath]
- findFortuneFilesIn :: [(String, Bool)] -> [String] -> IO [FilePath]
- data FortuneType
- getFortuneDir :: FortuneType -> IO FilePath
- defaultFortuneFiles :: FortuneType -> IO [FilePath]
- defaultFortuneSearchPath :: FortuneType -> IO [(FilePath, Bool)]
- getFortuneSearchPath :: FortuneType -> IO [(FilePath, Bool)]
- resolveFortuneFile :: FortuneType -> String -> IO [FilePath]
- resolveFortuneFiles :: FortuneType -> [String] -> IO [FilePath]
- randomFortune :: [String] -> IO String
- randomFortuneFromRandomFile :: RVar FortuneFile -> IO String
- defaultFortuneDistribution :: [FortuneFile] -> IO (Categorical Float FortuneFile)
- fortuneDistributionWhere :: (FortuneFile -> Int -> IndexEntry -> IO Bool) -> [FortuneFile] -> IO (Categorical Float (FortuneFile, Categorical Float Int))
- withFortuneFile :: Char -> Bool -> FilePath -> (FortuneFile -> IO a) -> IO a
- withFortuneFiles :: Char -> Bool -> [FilePath] -> ([FortuneFile] -> IO a) -> IO a
- mapFortunesWithIndexM :: (Num a, Enum a) => (a -> IndexEntry -> IO b) -> FortuneFile -> IO [b]
- mapFortunesWithIndex :: (Num a, Enum a) => (a -> IO b) -> FortuneFile -> IO [b]
- mapFortunesM :: (IndexEntry -> IO b) -> FortuneFile -> IO [b]
- mapFortunes :: (IndexEntry -> b) -> FortuneFile -> IO [b]
- filterFortunesWithIndexM :: (Num a, Enum a) => (a -> IndexEntry -> IO Bool) -> FortuneFile -> IO [a]
- filterFortunesWithIndex :: (Num a, Enum a) => (a -> IndexEntry -> Bool) -> FortuneFile -> IO [a]
- filterFortunesM :: (Num a, Enum a) => (IndexEntry -> IO Bool) -> FortuneFile -> IO [a]
- filterFortunes :: (Num a, Enum a) => (IndexEntry -> Bool) -> FortuneFile -> IO [a]
Documentation
data FortuneFile Source
A handle to an open fortune database.
fortuneFilePath :: FortuneFile -> FilePath Source
Get the path of the text part of an open fortune database.
fortuneIndexPath :: FortuneFile -> FilePath Source
Get the path of the index part of an open fortune database.
openFortuneFile :: Char -> Bool -> FilePath -> IO FortuneFile Source
openFortuneFile path delim writeMode: Open a fortune file at path,
using delim as the character between strings, allowing writing if
writeMode is set. If no file exists at the specified path, an error
will be thrown or the file will be created, depending on writeMode.
closeFortuneFile :: FortuneFile -> IO () Source
Close a fortune file. Subsequent accesses will fail.
getIndex :: FortuneFile -> IO Index Source
Get the Index of a FortuneFile, opening it if necessary.
rebuildIndex :: FortuneFile -> IO () Source
Clear a FortuneFiles Index and rebuild it from the contents
of the text file.
getFortune :: FortuneFile -> Int -> IO Text Source
getFortune f i retrieves the text of the i'th fortune
(according to the order in the index file) in the FortuneFile f.
getFortunes :: FortuneFile -> IO [Text] Source
Get the text of every fortune in a fortune file, in the order they occur in the file. Ignores the index entirely.
getNumFortunes :: FortuneFile -> IO Int Source
Get the number of fortunes in a fortune file, as recorded in the index.
appendFortune :: FortuneFile -> Text -> IO () Source
Append a fortune to a fortune file, inserting a delimiter if needed and updating the index.
createVirtualIndex :: IO Index Source
Create an in-memory index - useful for working with files when, for whatever reason, you cannot create a valid index.
closeIndex :: Index -> IO () Source
Close an index file. Subsequent accesses will fail.
getStats :: Index -> IO FortuneStats Source
Get some cached stats about the fortunes indexed in this file.
data StatsProblem Source
Errors that can be thrown when stats are read from an index file. These errors describe various logical inconsistencies that generally indicate that the index file is corrupted somehow.
data HeaderProblem Source
An exception type indicating things that can be wrong about an index file's header.
data IndexProblem Source
Errors that can be thrown indicating a problem with an index file.
Constructors
| HeaderProblem !HeaderProblem | |
| TableLongerThanFile | |
| AccessToClosedIndex |
checkIndex :: Index -> IO (Maybe IndexProblem) Source
Force a consistency check on an index file.
data IndexEntry Source
Conceptually, an Index file is just a header containing FortuneStats and an array of these entries.
An IndexEntry stores the information needed to locate one string in the fortune fiel, as well as some
basic stats about that one file (from which the FortuneStats will be derived).
Constructors
| IndexEntry | |
Fields
| |
Instances
indexEntryStats :: IndexEntry -> FortuneStats Source
Convert one index entry to a FortuneStats record describing it.
getEntries :: Index -> IO (Vector IndexEntry) Source
Read all the entries in an Index
unfoldEntries :: Index -> IO (Maybe IndexEntry) -> IO () Source
Repeatedly invoke a generator for index entries until it returns Nothing,
appending all entries returned to the index file.
appendEntries :: Index -> Vector IndexEntry -> IO () Source
Append all the given entries to the Index file.
appendEntry :: Index -> IndexEntry -> IO () Source
Append a single IndexEntry to an Index file.
clearIndex :: Index -> IO () Source
Delete all entries from an Index.
rebuildStats :: Index -> IO () Source
All the operations here should preserve correctness of stats, but just in case... This procedure forces the stats to be recomputed.
data FortuneStats Source
Some statistics about the fortunes in a database. These are stored in the index file and used to speed up various calculations that would otherwise require re-reading lots of files.
numFortunes :: FortuneStats -> Int Source
The number of fortune strings in the index
minChars :: FortuneStats -> Int Source
The smallest number of characters in any string in the index
maxLines :: FortuneStats -> Int Source
The greatest number of characters in any string in the index
minLines :: FortuneStats -> Int Source
The smallest number of lines in any string in the index
maxChars :: FortuneStats -> Int Source
The greatest number of lines in any string in the index
listFortuneFiles :: Bool -> FilePath -> IO [FilePath] Source
List all the fortune files in a directory. The Bool value
specifies whether to search subtrees as well.
Any file which does not have an extension of ".ix" or ".dat"
will be reported as a fortune file (".dat" is not used by
misfortune, but is ignored so that misfortune can share fortune
databases with fortune).
listFortuneFilesIn :: [(FilePath, Bool)] -> IO [FilePath] Source
List all the fortune files in several directories. Each directory
will be searched by listFortuneFiles (using the corresponding Bool
value to control whether the directory is searched recursively) and all
results will be combined.
findFortuneFile :: Bool -> FilePath -> String -> IO [FilePath] Source
Like listFortuneFiles except only returning paths with the
specified file name.
findFortuneFileIn :: [(String, Bool)] -> String -> IO [FilePath] Source
Like listFortuneFilesIn except only returning paths with the
specified file name.
findFortuneFilesIn :: [(String, Bool)] -> [String] -> IO [FilePath] Source
Like findFortuneFileIn but searches for multiple files in multiple directories.
data FortuneType Source
Three different search paths are supported, depending on the "type" of fortune requested. These are the types that can be requested.
getFortuneDir :: FortuneType -> IO FilePath Source
Get the path of the directory containing built-in fortunes of the specified type.
defaultFortuneFiles :: FortuneType -> IO [FilePath] Source
Get a list of all fortune files on the configured search path (see getFortuneSearchPath)
defaultFortuneSearchPath :: FortuneType -> IO [(FilePath, Bool)] Source
Get the default search path for a specified fortune type (ignoring the MISFORTUNE_PATH environment variables)
getFortuneSearchPath :: FortuneType -> IO [(FilePath, Bool)] Source
Get the configured search path for a specified fortune type.
If the environment variable MISFORTUNE_PATH_TYPE is set, it will be used.
Otherwise, if MISFORTUNE_PATH is set, it will be used. Otherwise, the
defaultFortuneSearchPath will be used.
Environment variables are interpreted by splitting on :+ or - prefix on each component (where + indicates
recursive search of that directory). The default is non-recursive search
for each component.
resolveFortuneFile :: FortuneType -> String -> IO [FilePath] Source
Search for all fortune files in the configured search path with the given name.
resolveFortuneFiles :: FortuneType -> [String] -> IO [FilePath] Source
Search for all fortune files in the configured search path with any of the given names.
randomFortune :: [String] -> IO String Source
Select a random fortune from all files matching any of a list of names (or if the list is empty, all fortune files on the search path). Every fortune string will have an equal probability of being selected.
randomFortuneFromRandomFile :: RVar FortuneFile -> IO String Source
Select a random fortune file from a specified distribution and then select a random fortune from that file (unformly).
defaultFortuneDistribution :: [FortuneFile] -> IO (Categorical Float FortuneFile) Source
Given a list of FortuneFiles, compute a distrubution over them weighted by the number
of fortunes in each. If this distribution is used with randomFortuneFromRandomFile,
the result will be a uniform selection over all the fortunes in all the files.
fortuneDistributionWhere :: (FortuneFile -> Int -> IndexEntry -> IO Bool) -> [FortuneFile] -> IO (Categorical Float (FortuneFile, Categorical Float Int)) Source
Like defaultFortuneDistribution, but filtering the fortunes. In addition to the
fortune file, the tuples in the distribution include a distribution over the
matching fortune indices in that file, assigning equal weight to each.
withFortuneFile :: Char -> Bool -> FilePath -> (FortuneFile -> IO a) -> IO a Source
Perform an action with an open FortuneFile, ensuring the file is closed
when the action finishes.
withFortuneFiles :: Char -> Bool -> [FilePath] -> ([FortuneFile] -> IO a) -> IO a Source
Perform an action with many open FortuneFiles, ensuring the files are closed
when the action finishes.
mapFortunesWithIndexM :: (Num a, Enum a) => (a -> IndexEntry -> IO b) -> FortuneFile -> IO [b] Source
mapFortunesWithIndex :: (Num a, Enum a) => (a -> IO b) -> FortuneFile -> IO [b] Source
mapFortunesM :: (IndexEntry -> IO b) -> FortuneFile -> IO [b] Source
mapFortunes :: (IndexEntry -> b) -> FortuneFile -> IO [b] Source
filterFortunesWithIndexM :: (Num a, Enum a) => (a -> IndexEntry -> IO Bool) -> FortuneFile -> IO [a] Source
filterFortunesWithIndex :: (Num a, Enum a) => (a -> IndexEntry -> Bool) -> FortuneFile -> IO [a] Source
filterFortunesM :: (Num a, Enum a) => (IndexEntry -> IO Bool) -> FortuneFile -> IO [a] Source
filterFortunes :: (Num a, Enum a) => (IndexEntry -> Bool) -> FortuneFile -> IO [a] Source