304 lines
9.6 KiB
Haskell
304 lines
9.6 KiB
Haskell
{-# LANGUAGE FlexibleContexts, TypeFamilies #-}
|
|
-- | Debugging helpers
|
|
|
|
-- more:
|
|
-- http://hackage.haskell.org/packages/archive/TraceUtils/0.1.0.2/doc/html/Debug-TraceUtils.html
|
|
-- http://hackage.haskell.org/packages/archive/trace-call/0.1/doc/html/Debug-TraceCall.html
|
|
-- http://hackage.haskell.org/packages/archive/htrace/0.1/doc/html/Debug-HTrace.html
|
|
-- http://hackage.haskell.org/packages/archive/traced/2009.7.20/doc/html/Debug-Traced.html
|
|
|
|
module Hledger.Utils.Debug (
|
|
pprint
|
|
,pshow
|
|
,ptrace
|
|
,traceWith
|
|
,debugLevel
|
|
,ptraceAt
|
|
,ptraceAtWith
|
|
,dbg0
|
|
,dbg1
|
|
,dbg2
|
|
,dbg3
|
|
,dbg4
|
|
,dbg5
|
|
,dbg6
|
|
,dbg7
|
|
,dbg8
|
|
,dbg9
|
|
,dbg0With
|
|
,dbg1With
|
|
,dbg2With
|
|
,dbg3With
|
|
,dbg4With
|
|
,dbg5With
|
|
,dbg6With
|
|
,dbg7With
|
|
,dbg8With
|
|
,dbg9With
|
|
,dbgExit
|
|
,ptraceAtIO
|
|
,dbg0IO
|
|
,dbg1IO
|
|
,dbg2IO
|
|
,dbg3IO
|
|
,dbg4IO
|
|
,dbg5IO
|
|
,dbg6IO
|
|
,dbg7IO
|
|
,dbg8IO
|
|
,dbg9IO
|
|
,plog
|
|
,plogAt
|
|
,traceParse
|
|
,dbgparse
|
|
,module Debug.Trace
|
|
)
|
|
where
|
|
|
|
import Control.Monad (when)
|
|
import Control.Monad.IO.Class
|
|
import Data.List hiding (uncons)
|
|
import qualified Data.Text as T
|
|
import Debug.Trace
|
|
import Hledger.Utils.Parse
|
|
import Safe (readDef)
|
|
import System.Environment (getArgs)
|
|
import System.Exit
|
|
import System.IO.Unsafe (unsafePerformIO)
|
|
import Text.Megaparsec
|
|
import Text.Printf
|
|
import Text.Show.Pretty (ppShow, pPrint)
|
|
|
|
-- | Pretty print. Easier alias for pretty-show's pPrint.
|
|
pprint :: Show a => a -> IO ()
|
|
pprint = pPrint
|
|
|
|
-- | Pretty show. Easier alias for pretty-show's ppShow.
|
|
pshow :: Show a => a -> String
|
|
pshow = ppShow
|
|
|
|
-- | Pretty trace. Easier alias for traceShowId + ppShow.
|
|
ptrace :: Show a => a -> a
|
|
ptrace = traceWith pshow
|
|
|
|
-- | Trace (print to stderr) a showable value using a custom show function.
|
|
traceWith :: (a -> String) -> a -> a
|
|
traceWith f a = trace (f a) a
|
|
|
|
-- | Global debug level, which controls the verbosity of debug output
|
|
-- on the console. The default is 0 meaning no debug output. The
|
|
-- @--debug@ command line flag sets it to 1, or @--debug=N@ sets it to
|
|
-- a higher value (note: not @--debug N@ for some reason). This uses
|
|
-- unsafePerformIO and can be accessed from anywhere and before normal
|
|
-- command-line processing. When running with :main in GHCI, you must
|
|
-- touch and reload this module to see the effect of a new --debug option.
|
|
-- After command-line processing, it is also available as the @debug_@
|
|
-- field of 'Hledger.Cli.CliOptions.CliOpts'.
|
|
-- {-# OPTIONS_GHC -fno-cse #-}
|
|
-- {-# NOINLINE debugLevel #-}
|
|
debugLevel :: Int
|
|
debugLevel = case snd $ break (=="--debug") args of
|
|
"--debug":[] -> 1
|
|
"--debug":n:_ -> readDef 1 n
|
|
_ ->
|
|
case take 1 $ filter ("--debug" `isPrefixOf`) args of
|
|
['-':'-':'d':'e':'b':'u':'g':'=':v] -> readDef 1 v
|
|
_ -> 0
|
|
|
|
where
|
|
args = unsafePerformIO getArgs
|
|
|
|
-- | Pretty-print a label and a showable value to the console
|
|
-- if the global debug level is at or above the specified level.
|
|
-- At level 0, always prints. Otherwise, uses unsafePerformIO.
|
|
ptraceAt :: Show a => Int -> String -> a -> a
|
|
ptraceAt level
|
|
| level > 0 && debugLevel < level = flip const
|
|
| otherwise = \s a -> let p = ppShow a
|
|
ls = lines p
|
|
nlorspace | length ls > 1 = "\n"
|
|
| otherwise = " " ++ take (10 - length s) (repeat ' ')
|
|
ls' | length ls > 1 = map (" "++) ls
|
|
| otherwise = ls
|
|
in trace (s++":"++nlorspace++intercalate "\n" ls') a
|
|
|
|
-- | Like ptraceAt, but takes a custom show function instead of a label.
|
|
ptraceAtWith :: Show a => Int -> (a -> String) -> a -> a
|
|
ptraceAtWith level f
|
|
| level > 0 && debugLevel < level = id
|
|
| otherwise = \a -> let p = f a
|
|
-- ls = lines p
|
|
-- nlorspace | length ls > 1 = "\n"
|
|
-- | otherwise = " " ++ take (10 - length s) (repeat ' ')
|
|
-- ls' | length ls > 1 = map (" "++) ls
|
|
-- | otherwise = ls
|
|
-- in trace (s++":"++nlorspace++intercalate "\n" ls') a
|
|
in trace p a
|
|
|
|
-- "dbg" would clash with megaparsec.
|
|
-- | Pretty-print a label and the showable value to the console, then return it.
|
|
dbg0 :: Show a => String -> a -> a
|
|
dbg0 = ptraceAt 0
|
|
|
|
-- | Pretty-print a label and the showable value to the console when the global debug level is >= 1, then return it.
|
|
-- Uses unsafePerformIO.
|
|
dbg1 :: Show a => String -> a -> a
|
|
dbg1 = ptraceAt 1
|
|
|
|
dbg2 :: Show a => String -> a -> a
|
|
dbg2 = ptraceAt 2
|
|
|
|
dbg3 :: Show a => String -> a -> a
|
|
dbg3 = ptraceAt 3
|
|
|
|
dbg4 :: Show a => String -> a -> a
|
|
dbg4 = ptraceAt 4
|
|
|
|
dbg5 :: Show a => String -> a -> a
|
|
dbg5 = ptraceAt 5
|
|
|
|
dbg6 :: Show a => String -> a -> a
|
|
dbg6 = ptraceAt 6
|
|
|
|
dbg7 :: Show a => String -> a -> a
|
|
dbg7 = ptraceAt 7
|
|
|
|
dbg8 :: Show a => String -> a -> a
|
|
dbg8 = ptraceAt 8
|
|
|
|
dbg9 :: Show a => String -> a -> a
|
|
dbg9 = ptraceAt 9
|
|
|
|
-- | Like dbg0, but takes a custom show function instead of a label.
|
|
dbg0With :: Show a => (a -> String) -> a -> a
|
|
dbg0With = ptraceAtWith 0
|
|
|
|
dbg1With :: Show a => (a -> String) -> a -> a
|
|
dbg1With = ptraceAtWith 1
|
|
|
|
dbg2With :: Show a => (a -> String) -> a -> a
|
|
dbg2With = ptraceAtWith 2
|
|
|
|
dbg3With :: Show a => (a -> String) -> a -> a
|
|
dbg3With = ptraceAtWith 3
|
|
|
|
dbg4With :: Show a => (a -> String) -> a -> a
|
|
dbg4With = ptraceAtWith 4
|
|
|
|
dbg5With :: Show a => (a -> String) -> a -> a
|
|
dbg5With = ptraceAtWith 5
|
|
|
|
dbg6With :: Show a => (a -> String) -> a -> a
|
|
dbg6With = ptraceAtWith 6
|
|
|
|
dbg7With :: Show a => (a -> String) -> a -> a
|
|
dbg7With = ptraceAtWith 7
|
|
|
|
dbg8With :: Show a => (a -> String) -> a -> a
|
|
dbg8With = ptraceAtWith 8
|
|
|
|
dbg9With :: Show a => (a -> String) -> a -> a
|
|
dbg9With = ptraceAtWith 9
|
|
|
|
-- | Like dbg0, but also exit the program. Uses unsafePerformIO.
|
|
dbgExit :: Show a => String -> a -> a
|
|
dbgExit msg = const (unsafePerformIO exitFailure) . dbg0 msg
|
|
|
|
-- | Like ptraceAt, but convenient to insert in an IO monad (plus
|
|
-- convenience aliases).
|
|
-- XXX These have a bug; they should use
|
|
-- traceIO, not trace, otherwise GHC can occasionally over-optimise
|
|
-- (cf lpaste a few days ago where it killed/blocked a child thread).
|
|
ptraceAtIO :: (MonadIO m, Show a) => Int -> String -> a -> m ()
|
|
ptraceAtIO lvl lbl x = liftIO $ ptraceAt lvl lbl x `seq` return ()
|
|
|
|
-- XXX Could not deduce (a ~ ())
|
|
-- ptraceAtM :: (Monad m, Show a) => Int -> String -> a -> m a
|
|
-- ptraceAtM lvl lbl x = ptraceAt lvl lbl x `seq` return x
|
|
|
|
dbg0IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg0IO = ptraceAtIO 0
|
|
|
|
dbg1IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg1IO = ptraceAtIO 1
|
|
|
|
dbg2IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg2IO = ptraceAtIO 2
|
|
|
|
dbg3IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg3IO = ptraceAtIO 3
|
|
|
|
dbg4IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg4IO = ptraceAtIO 4
|
|
|
|
dbg5IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg5IO = ptraceAtIO 5
|
|
|
|
dbg6IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg6IO = ptraceAtIO 6
|
|
|
|
dbg7IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg7IO = ptraceAtIO 7
|
|
|
|
dbg8IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg8IO = ptraceAtIO 8
|
|
|
|
dbg9IO :: (MonadIO m, Show a) => String -> a -> m ()
|
|
dbg9IO = ptraceAtIO 9
|
|
|
|
-- | Log a label and a pretty-printed showable value to ./debug.log, then return it.
|
|
-- Can fail, see plogAt.
|
|
plog :: Show a => String -> a -> a
|
|
plog = plogAt 0
|
|
|
|
-- | Log a label and a pretty-printed showable value to ./debug.log,
|
|
-- if the global debug level is at or above the specified level.
|
|
-- At level 0, always logs. Otherwise, uses unsafePerformIO.
|
|
-- Tends to fail if called more than once, at least when built with -threaded
|
|
-- (Exception: debug.log: openFile: resource busy (file is locked)).
|
|
plogAt :: Show a => Int -> String -> a -> a
|
|
plogAt lvl
|
|
| lvl > 0 && debugLevel < lvl = flip const
|
|
| otherwise = \s a ->
|
|
let p = ppShow a
|
|
ls = lines p
|
|
nlorspace | length ls > 1 = "\n"
|
|
| otherwise = " " ++ take (10 - length s) (repeat ' ')
|
|
ls' | length ls > 1 = map (" "++) ls
|
|
| otherwise = ls
|
|
output = s++":"++nlorspace++intercalate "\n" ls'++"\n"
|
|
in unsafePerformIO $ appendFile "debug.log" output >> return a
|
|
|
|
-- XXX redundant ? More/less robust than plogAt ?
|
|
-- -- | Like dbg, but writes the output to "debug.log" in the current directory.
|
|
-- dbglog :: Show a => String -> a -> a
|
|
-- dbglog label a =
|
|
-- (unsafePerformIO $
|
|
-- appendFile "debug.log" $ label ++ ": " ++ ppShow a ++ "\n")
|
|
-- `seq` a
|
|
|
|
-- | Print the provided label (if non-null) and current parser state
|
|
-- (position and next input) to the console. (See also megaparsec's dbg.)
|
|
traceParse :: String -> TextParser m ()
|
|
traceParse msg = do
|
|
pos <- getSourcePos
|
|
next <- (T.take peeklength) `fmap` getInput
|
|
let (l,c) = (sourceLine pos, sourceColumn pos)
|
|
s = printf "at line %2d col %2d: %s" (unPos l) (unPos c) (show next) :: String
|
|
s' = printf ("%-"++show (peeklength+30)++"s") s ++ " " ++ msg
|
|
trace s' $ return ()
|
|
where
|
|
peeklength = 30
|
|
|
|
-- | Print the provided label (if non-null) and current parser state
|
|
-- (position and next input) to the console if the global debug level
|
|
-- is at or above the specified level. Uses unsafePerformIO.
|
|
-- (See also megaparsec's dbg.)
|
|
traceParseAt :: Int -> String -> TextParser m ()
|
|
traceParseAt level msg = when (level <= debugLevel) $ traceParse msg
|
|
|
|
-- | Convenience alias for traceParseAt
|
|
dbgparse :: Int -> String -> TextParser m ()
|
|
dbgparse level msg = traceParseAt level msg
|
|
|