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{-
sscan --- text UI for scanning with SANE
Copyright (C) 2017 Sean Whitton
This file is part of sscan.
sscan is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
sscan is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with sscan. If not, see <http://www.gnu.org/licenses/>.
-}
{-# LANGUAGE OverloadedStrings #-}
import Control.Concurrent (forkIO)
import Control.Monad (void, when)
import Data.Time.Clock.POSIX (getPOSIXTime)
import Lens.Micro ((&), (.~), (^.))
import System.Directory (getHomeDirectory,
removeDirectoryRecursive, renamePath,
withCurrentDirectory)
import System.FilePath ((<.>), (</>))
import System.IO (IOMode (WriteMode), hClose, openFile)
import System.IO.Temp (withSystemTempDirectory)
import System.Process
import Types.State
import UI
processScanSessDir :: St -> FilePath -> IO ()
processScanSessDir st dir = withCurrentDirectory dir $ do
stamp <- round <$> getPOSIXTime
logH <- openFile (logFile stamp) WriteMode
outH <- openFile (outFile stamp) WriteMode
case st^.stOutFormat of
PDF -> do
-- 1. convert tiff->PDF
createProcessWait_ "convert"
(proc "convert" (allPages ++ ["temp.pdf"]))
-- 2. set metadata with pdftk
renamePath "temp.pdf" "temp2.pdf"
writeFile "metadata" metadata
createProcessWait_ "pdftk"
(proc "pdftk" ["temp2.pdf", "update_info", "metadata", "temp.pdf"])
{ std_in = NoStream
, std_out = NoStream
, std_err = UseHandle logH
}
-- 3. maybe ocrmypdf
when (st^.stOCR) $ renamePath "temp.pdf" "temp2.pdf"
>> createProcessWait_ "OCRmyPDF"
(proc "ocrmypdf" ["-c", "-i", "-r", "temp2.pdf", "temp.pdf"])
{ std_in = NoStream
, std_out = NoStream
, std_err = UseHandle logH
}
-- 4. qpdf (ocrmypdf might invoke this; do it again as I
-- think that OCRmyPDF isn't using its --linearize option,
-- which shrinks the PDF)
createProcessWait_ "qpdf" (proc "qpdf" ["--linearize", "temp.pdf"])
{ std_in = NoStream
, std_out = UseHandle outH
, std_err = UseHandle logH
}
-- assume that only one page was scanned. Not clear how we
-- can avoid this assumption when producing a PNG
PNG -> createProcessWait_ "convert"
(proc "convert" ["page1" <.> "tiff", "png:-"])
{ std_in = NoStream
, std_out = UseHandle outH
, std_err = UseHandle logH
}
hClose outH
hClose logH
where
logFile stamp = (st^.stOutdir) </> show stamp <.> "log"
outFile stamp = (st^.stOutdir) </> show stamp <.> outExt
outExt = case st^.stOutFormat of
PDF -> "pdf"
PNG -> "png"
allPages = map (\n -> "page" ++ show n <.> "tiff") [1..(getLatestPage st)]
metadata = undefined
makeInitialState :: IO St
makeInitialState = do
home <- getHomeDirectory
papersize <- init <$> readFile "/etc/papersize"
let paper = if papersize == "letter" then Letter else A4
return St
{ _stScanSess = Nothing
, _stOCR = True
, _stColour = Greyscale
, _stPaper = paper
, _stDefaultPaper = paper
, _stDPI = 300
, _stOutFormat = PDF
, _stOutdir = home </> "tmp"
}
scanPage :: St -> FilePath -> IO ()
scanPage st dir = do
outH <- openFile outF WriteMode
-- TODO if scanimage exists non-zero, inform the user that we will
-- abort the scan session, pause for them to read the output, and then
-- abort the scan session
createProcessWait_ "scanimage" (proc "scanimage" (scanimageArgs st))
{ std_in = NoStream
, std_out = UseHandle outH
, std_err = Inherit -- let the user see progress bar
}
hClose outH
where
outF = dir </> "page" ++ (show $ getLatestPage st + 1) <.> "tiff"
scanimageArgs :: St -> [String]
scanimageArgs st =
[ "-vp"
, "--format=tiff"
, "--resolution=" ++ show (st^.stDPI)
, "--mode=" ++ case st^.stColour of
Colour -> "Color"
Greyscale -> "Gray"
Lineart -> "Lineart"
, "-x"
, show $ case st^.stPaper of
A4 -> 210
Letter -> 215.9
Photo -> 150
, "-y"
, show $ case st^.stPaper of
A4 -> 297
Letter -> 279.4
Photo -> 100
]
processCommand :: St -> IO ()
processCommand st = case st^.stScanSess of
Nothing -> return () -- quit sscan
Just (ScanSess command pages maybeDir) -> case maybeDir of
Nothing -> withSystemTempDirectory "sscan" $ \dir ->
processCommand (setScanSessDir dir st)
Just dir -> case command of
Abort -> newSession
NextPage -> scanPage st dir >> presentUI (incrementPages st)
FinalPage -> scanPage st dir
>> finaliseSession (incrementPages st) dir >> newSession
Finalise -> finaliseSession st dir >> newSession
where
newSession = presentUI $ resetScanSess st
finaliseSession st dir = forkIO $ processScanSessDir st dir
presentUI :: St -> IO ()
presentUI st = runTheApp st >>= processCommand
main = makeInitialState >>= presentUI
-- | Create a process, wait for it to finish, don't close any
-- handles used by the CreateProcess record
createProcessWait_ :: String -> CreateProcess -> IO ()
createProcessWait_ s c = do
(_, _, _, p) <- createProcess_ s c
void $ waitForProcess p
-- TODO scanning should happen in main. We use withTempDir to setup a
-- session, and then fire up brick again. add additional state
-- element that is the user's chosen action. i.e. don't use
-- suspendAndResume which is for getting user input, not running the
-- result of the UI. Move the whole UI to a module
|
