paperless: init scan2paperless script

hosts/fae/paperless.nix

@@ -13,33 +13,6 @@ with lib; let
   backupDir = "${xdg.dataHome}/PaperlessBackup";
   consumptionDir = "/home/${psCfg.user.name}/.local/share/scandir";
 
-  scan2paperless = with pkgs; writeShellScriptBin "scan2paperless" ''
-    DEVICE=$1
-    NUM_PAGES=$2
-    NAME=$3
-
-    if [ -z "''${DEVICE}" ] || [ -z "''${NUM_PAGES}" ] || [ -z "''${NAME}" ]; then
-      echo "Usage: scan2paperless <device> <num_pages> <name>"
-      exit 1
-    fi
-
-    tmpDir=$(${coreutils}/bin/mktemp -d)
-    files=()
-
-    for i in $(seq 1 $NUM_PAGES); do
-      fileName=$(${openssl}/bin/openssl rand -hex 12)
-      file="$tmpDir/$fileName.jpg"
-      echo "Start scanning page $i/$NUM_PAGES";
-      ${sane-backends}/bin/scanimage -d $DEVICE --format=jpeg --resolution 300 --progress -o $file
-      echo "Finished scanning page $i";
-      files+=($file)
-    done
-
-    pdf="${consumptionDir}/$NAME.pdf"
-    ${python3Packages.img2pdf}/bin/img2pdf --output $pdf ''${files[@]}
-
-    echo "PDF written to $pdf"
-  '';
 in {
   services.paperless = {
     enable = true;
@@ -60,11 +33,6 @@ in {
     #brscan5.enable = true;
   };
 
-  users.users."${psCfg.user.name}".packages = with pkgs; [
-    scan2paperless
-    python3Packages.img2pdf
-  ];
-
   home-manager.users."${psCfg.user.name}" = {
     home.sessionVariables = {
       SCANNER_OUTPUT_DIR = consumptionDir;

pkgs/default.nix

@@ -13,6 +13,7 @@ with prev; {
   psos = writeShellScriptBin "psos" (import ./psos.nix final);
   psos-docs = import ./psos-docs.nix final;
   s = writeShellScriptBin "s" (import ./s.nix final);
+  scan2paperless = writeShellScriptBin "scan2paperless" (import ./scan2paperless.nix final);
   sway-launcher = writeScriptBin "sway-launcher" (import ./sway-launcher.nix final);
   swaylock-bg = writeShellScriptBin "swaylock-bg" (import ./swaylock-bg.nix final);
   toggle-kbd-layout = writeShellScriptBin "toggle-kbd-layout" (import ./toggle-kbd-layout.nix final);

pkgs/scan2paperless.nix

@@ -0,0 +1,59 @@
+self:
+with self; ''
+  echo "$@"
+  DUPLEX=,Duplex
+  removeempty="true"
+
+  [[ $1 == "-s" ]] && {
+  	DUPLEX=""
+  	removeempty=false
+  	shift
+  }
+
+  [[ $1 == "-a" ]] && {
+  	DUPLEX=,Duplex
+    removeempty="true"
+  	shift
+  }
+
+  [[ $1 == "-d" ]] && {
+  	DUPLEX=,Duplex
+  	shift
+  }
+
+  cleanup() {
+  	echo finalizing pdf file.
+  	${img2pdf}/bin/img2pdf --pdfa --output /tmp/scan2paperless_$$.pdf /tmp/scan2paperless_$$_*.png && \
+  	rm -f /tmp/scan2paperless_$$_*.png
+
+    scp /tmp/scan2paperless_$$.pdf pub-solar@paperless.faenix.eu:~/.local/share/scandir \
+  		&& rm -f /tmp/scan2paperless_$$* \
+  		|| echo upload failed, retaining file /tmp/scan2paperless_$$.pdf >&2
+  }
+
+  trap 'cleanup; exit 1' EXIT
+
+  ${sane-backends}/bin/scanimage --device 'brother5:bus1;dev5' --format=png --resolution 300 --batch=/tmp/scan2paperless_$$_%d.png --AutoDeskew=yes --batch-start=10 --source="Automatic Document Feeder(left aligned''${DUPLEX})" -x 210 -y 297
+
+  if $removeempty
+  then
+  	threshold=99
+  	images=( )
+  	values=( )
+  	for f in /tmp/scan2paperless_$$_*.png
+  	do
+  		images[''${#images[@]}]=$f
+  		values[''${#values[@]}]=$(${imagemagick}/bin/convert "$f" -fuzz 02% -fill black +opaque white -fill white -opaque white -format "%[fx:100*mean]" info:)
+  	done
+
+  	for ((i=0;i<''${#images[@]};i++))
+  	do
+  		if [[ $(echo "''${values[i]} > $threshold" | ${bc}/bin/bc -l) == "1" ]]
+  		then
+  			# bc will output 1 if the comparison is true, 0 otherwise
+  			echo image "''${images[i]}" was found to be mostly white, removing.
+  			rm "''${images[i]}"
+  		fi
+  	done
+  fi
+''

users/teutat3s/home.nix

@@ -80,6 +80,7 @@ in {
         age-plugin-yubikey
         #cockroach-bin
         obs-studio
+        scan2paperless
         wlvncc
       ];
       programs.bash.initExtra = ''