log to ~/.debug-me/log/

Make watcher also log and display the name of the logfile at start and
end of session.

--download still downloads to current directory because that seems less
surprising than downloading to elsewhere. Also, the user might want to
keep a copy of the local log while downloading the server log.

1 files changed, 22 insertions, 0 deletions

diff --git a/Log.hs b/Log.hs
index ecf0614..cfbffea 100644
--- a/Log.hs
+++ b/Log.hs
@@ -6,11 +6,16 @@ import Types
 import Hash
 import Memory
 import JSON
+import SessionID
 
 import Data.Char
 import Data.Time.Clock.POSIX
 import qualified Data.ByteString.Lazy as L
 import System.IO
+import System.Posix
+import System.Directory
+import System.FilePath
+import Control.Exception
 
 -- | One item in a log of a debug-me session.
 --
@@ -49,6 +54,23 @@ type Timestamp = POSIXTime
 
 type Logger = AnyMessage -> IO ()
 
+logDir :: IO FilePath
+logDir = do
+	home <- homeDirectory <$> (getUserEntryForID =<< getEffectiveUserID)
+	return $ home </> ".debug-me" </> "log"
+
+withSessionLogger :: SessionID -> (Logger -> IO a) -> IO a
+withSessionLogger sessionid a = bracket setup cleanup go
+  where
+	setup = do
+		dir <- logDir
+		createDirectoryIfMissing True dir
+		let logfile = sessionLogFile dir sessionid
+		putStrLn $ "** debug-me is logging to " ++ logfile
+		return logfile
+	cleanup logfile = putStrLn $ "** debug-me session was logged to " ++ logfile
+	go logfile = withFile logfile WriteMode (a . mkLogger)
+
 withLogger :: FilePath -> (Logger -> IO a) -> IO a
 withLogger logfile a = withFile logfile WriteMode (a . mkLogger)