chore: init

7 files changed, 301 insertions, 0 deletions

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8075013
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/dist-newstyle
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..19fce49
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,5 @@
+# Revision history for apaperless
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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+
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diff --git a/apaperless.cabal b/apaperless.cabal
new file mode 100644
index 0000000..5001d21
--- /dev/null
+++ b/apaperless.cabal
@@ -0,0 +1,31 @@
+cabal-version:      3.4
+name:               apaperless
+version:            0.1.0.0
+-- synopsis:
+-- description:
+license:            Apache-2.0
+license-file:       LICENSE
+author:             Alexander Foremny
+maintainer:         aforemny@posteo.de
+-- copyright:
+category:           Text
+build-type:         Simple
+extra-doc-files:    CHANGELOG.md
+-- extra-source-files:
+
+common warnings
+    ghc-options: -Wall
+
+executable apaperless
+    import:           warnings
+    main-is:          Main.hs
+    -- other-modules:
+    -- other-extensions:
+    build-depends:    base ^>=4.16.4.0,
+      typed-process,
+      bytestring,
+      temporary,
+      directory,
+      filepath
+    hs-source-dirs:   app
+    default-language: GHC2021
diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
index 0000000..075414a
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,52 @@
+module Main where
+
+import Control.Exception (Exception, throwIO)
+import Data.ByteString.Lazy qualified as LB
+import Data.List
+import Data.String (IsString (fromString))
+import System.Directory
+import System.FilePath
+import System.IO.Temp (withSystemTempDirectory)
+import System.Process.Typed
+import Text.Printf (printf)
+
+main :: IO ()
+main = do
+  let input = "0000001.pdf"
+
+  withSystemTempDirectory input $ \tmp -> do
+    sh_ (printf "pdftoppm '%s' '%s' -png -r 300" input (tmp </> input))
+    imageInputs <- sort <$> listDirectory tmp
+    outputs <-
+      mapM
+        ( \imageInput -> do
+            sh_
+              ( printf
+                  "tesseract '%s' '%s' pdf -psm 1 -oem 1"
+                  (tmp </> imageInput)
+                  (tmp </> imageInput)
+              )
+            pure (imageInput <.> ".pdf")
+        )
+        imageInputs
+    sh_ ("pdfunite " ++ intercalate " " (map (printf "'%s'" . (tmp </>)) outputs ++ [printf "'%s'" (tmp </> input)]))
+    copyFile input (input <.> "bak")
+    copyFile (tmp </> input) ("." <> input)
+    renameFile ("." <> input) input
+    LB.putStr =<< sh (printf "pdftotext '%s' -" input)
+
+data ProcessException = ProcessException Int LB.ByteString
+  deriving (Show)
+
+instance Exception ProcessException
+
+sh :: String -> IO LB.ByteString
+sh cmd = do
+  -- printf "+ %s\n" cmd
+  (exitCode, out, err) <- readProcess (fromString cmd)
+  case exitCode of
+    ExitSuccess -> return out
+    ExitFailure exitCode' -> throwIO $ ProcessException exitCode' err
+
+sh_ :: String -> IO ()
+sh_ = fmap (\_ -> ()) . sh
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..ab82cf6
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> { } }:
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.haskellPackages.cabal-install
+    pkgs.ormolu
+    pkgs.poppler
+    pkgs.tesseract
+  ];
+}