196 lines
7.5 KiB
Haskell
196 lines
7.5 KiB
Haskell
{-# LANGUAGE ScopedTypeVariables, CPP #-}
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{-|
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Utilities for top-level modules and ghci. See also Hledger.Read and
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Hledger.Utils.
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-}
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module Hledger.Cli.Utils
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(
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withJournalDo,
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writeOutput,
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journalReload,
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journalReloadIfChanged,
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journalFileIsNewer,
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journalSpecifiedFileIsNewer,
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fileModificationTime,
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openBrowserOn,
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writeFileWithBackup,
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writeFileWithBackupIfChanged,
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readFileStrictly,
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Test(TestList),
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)
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where
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import Control.Exception as C
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import Data.List
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import Data.Maybe
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import Safe (readMay)
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import System.Console.CmdArgs
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import System.Directory (getModificationTime, getDirectoryContents, copyFile)
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import System.Exit
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import System.FilePath ((</>), splitFileName, takeDirectory)
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import System.Info (os)
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import System.Process (readProcessWithExitCode)
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import System.Time (ClockTime, getClockTime, diffClockTimes, TimeDiff(TimeDiff))
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import Test.HUnit
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import Text.Printf
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import Text.Regex.TDFA ((=~))
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-- kludge - adapt to whichever directory version is installed, or when
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-- cabal macros aren't available, assume the new directory
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#ifdef MIN_VERSION_directory
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#if MIN_VERSION_directory(1,2,0)
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#define directory_1_2
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#endif
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#else
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#define directory_1_2
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#endif
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#ifdef directory_1_2
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import System.Time (ClockTime(TOD))
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import Data.Time.Clock.POSIX (utcTimeToPOSIXSeconds)
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#endif
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import Hledger.Cli.Options
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import Hledger.Data
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import Hledger.Read
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import Hledger.Utils
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-- | Parse the user's specified journal file and run a hledger command on
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-- it, or throw an error.
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withJournalDo :: CliOpts -> (CliOpts -> Journal -> IO ()) -> IO ()
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withJournalDo opts cmd = do
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-- We kludgily read the file before parsing to grab the full text, unless
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-- it's stdin, or it doesn't exist and we are adding. We read it strictly
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-- to let the add command work.
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rulespath <- rulesFilePathFromOpts opts
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journalpath <- journalFilePathFromOpts opts
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ej <- readJournalFiles Nothing rulespath (not $ ignore_assertions_ opts) journalpath
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either error' (cmd opts . journalApplyAliases (aliasesFromOpts opts)) ej
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-- | Write some output to stdout or to a file selected by --output-file.
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writeOutput :: CliOpts -> String -> IO ()
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writeOutput opts s = do
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f <- outputFileFromOpts opts
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(if f == "-" then putStr else writeFile f) s
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-- -- | Get a journal from the given string and options, or throw an error.
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-- readJournalWithOpts :: CliOpts -> String -> IO Journal
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-- readJournalWithOpts opts s = readJournal Nothing Nothing Nothing s >>= either error' return
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-- | Re-read a journal from its data file, or return an error string.
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journalReload :: Journal -> IO (Either String Journal)
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journalReload j = readJournalFile Nothing Nothing True $ journalFilePath j
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-- | Re-read a journal from its data file mostly, only if the file has
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-- changed since last read (or if there is no file, ie data read from
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-- stdin). The provided options are mostly ignored. Return a journal or
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-- the error message while reading it, and a flag indicating whether it
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-- was re-read or not.
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journalReloadIfChanged :: CliOpts -> Journal -> IO (Either String Journal, Bool)
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journalReloadIfChanged _ j = do
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let maybeChangedFilename f = do newer <- journalSpecifiedFileIsNewer j f
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return $ if newer then Just f else Nothing
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changedfiles <- catMaybes `fmap` mapM maybeChangedFilename (journalFilePaths j)
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if not $ null changedfiles
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then do
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whenLoud $ printf "%s has changed, reloading\n" (head changedfiles)
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jE <- journalReload j
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return (jE, True)
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else
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return (Right j, False)
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-- | Has the journal's main data file changed since the journal was last
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-- read ?
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journalFileIsNewer :: Journal -> IO Bool
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journalFileIsNewer j@Journal{filereadtime=tread} = do
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tmod <- fileModificationTime $ journalFilePath j
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return $ diffClockTimes tmod tread > (TimeDiff 0 0 0 0 0 0 0)
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-- | Has the specified file (presumably one of journal's data files)
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-- changed since journal was last read ?
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journalSpecifiedFileIsNewer :: Journal -> FilePath -> IO Bool
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journalSpecifiedFileIsNewer Journal{filereadtime=tread} f = do
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tmod <- fileModificationTime f
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return $ diffClockTimes tmod tread > (TimeDiff 0 0 0 0 0 0 0)
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-- | Get the last modified time of the specified file, or if it does not
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-- exist or there is some other error, the current time.
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fileModificationTime :: FilePath -> IO ClockTime
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fileModificationTime f
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| null f = getClockTime
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| otherwise = (do
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#ifdef directory_1_2
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utc <- getModificationTime f
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let nom = utcTimeToPOSIXSeconds utc
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let clo = TOD (read $ takeWhile (`elem` "0123456789") $ show nom) 0 -- XXX read
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#else
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clo <- getModificationTime f
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#endif
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return clo
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)
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`C.catch` \(_::C.IOException) -> getClockTime
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-- | Attempt to open a web browser on the given url, all platforms.
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openBrowserOn :: String -> IO ExitCode
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openBrowserOn u = trybrowsers browsers u
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where
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trybrowsers (b:bs) u = do
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(e,_,_) <- readProcessWithExitCode b [u] ""
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case e of
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ExitSuccess -> return ExitSuccess
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ExitFailure _ -> trybrowsers bs u
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trybrowsers [] u = do
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putStrLn $ printf "Could not start a web browser (tried: %s)" $ intercalate ", " browsers
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putStrLn $ printf "Please open your browser and visit %s" u
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return $ ExitFailure 127
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browsers | os=="darwin" = ["open"]
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| os=="mingw32" = ["c:/Program Files/Mozilla Firefox/firefox.exe"]
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| otherwise = ["sensible-browser","gnome-www-browser","firefox"]
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-- jeffz: write a ffi binding for it using the Win32 package as a basis
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-- start by adding System/Win32/Shell.hsc and follow the style of any
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-- other module in that directory for types, headers, error handling and
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-- what not.
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-- ::ShellExecute(NULL, "open", "www.somepage.com", NULL, NULL, SW_SHOWNORMAL);
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-- | Back up this file with a (incrementing) numbered suffix then
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-- overwrite it with this new text, or give an error, but only if the text
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-- is different from the current file contents, and return a flag
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-- indicating whether we did anything.
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writeFileWithBackupIfChanged :: FilePath -> String -> IO Bool
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writeFileWithBackupIfChanged f t = do
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s <- readFile' f
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if t == s then return False
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else backUpFile f >> writeFile f t >> return True
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-- | Back up this file with a (incrementing) numbered suffix, then
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-- overwrite it with this new text, or give an error.
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writeFileWithBackup :: FilePath -> String -> IO ()
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writeFileWithBackup f t = backUpFile f >> writeFile f t
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readFileStrictly :: FilePath -> IO String
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readFileStrictly f = readFile' f >>= \s -> C.evaluate (length s) >> return s
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-- | Back up this file with a (incrementing) numbered suffix, or give an error.
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backUpFile :: FilePath -> IO ()
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backUpFile fp = do
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fs <- safeGetDirectoryContents $ takeDirectory $ fp
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let (d,f) = splitFileName fp
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versions = catMaybes $ map (f `backupNumber`) fs
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next = maximum (0:versions) + 1
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f' = printf "%s.%d" f next
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copyFile fp (d </> f')
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safeGetDirectoryContents :: FilePath -> IO [FilePath]
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safeGetDirectoryContents "" = getDirectoryContents "."
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safeGetDirectoryContents fp = getDirectoryContents fp
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-- | Does the second file represent a backup of the first, and if so which version is it ?
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-- XXX nasty regex types intruding, add a simpler api to Hledger.Utils.Regex
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backupNumber :: FilePath -> FilePath -> Maybe Int
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backupNumber f g = case g =~ ("^" ++ f ++ "\\.([0-9]+)$") of
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(_::FilePath, _::FilePath, _::FilePath, [ext::FilePath]) -> readMay ext
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_ -> Nothing
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