add unscan and dispatch command

.gitignore

@@ -0,0 +1 @@
+*.pdf

scanbuddy.bash

@@ -1,59 +1,90 @@
 #!/usr/bin/env bash
 
-brother_opts=()
-scanner_mode='Black & White'
-resolution='300'
-source='Automatic Document Feeder(left aligned)'
+# device="brother5:bus2;dev2"
+device=$(scanimage -f "%d%n" | grep brother5 | head -n 1)
+echo "Selecting scanner '$device'"
+
+# option values for the brother DS-740D scanner
+simplex_source='Automatic Document Feeder(left aligned)'
 duplex_source='Automatic Document Feeder(left aligned,Duplex)'
-
-device="brother5:bus4;dev3"
-
+color_mode='24bit Color[Fast]'
+bw_mode='Black & White'
+grayscale_mode='True Gray'
 valid_resolutions=("100" "150" "200" "300" "400" "600" "1200")
 
+# default options for scanning
+sides=$simplex_source
+mode='c'
+resolution='300'
+
+
 current_page=$(find "$PWD" -name "out*.pdf" | sort | tail -n 1);
 read -r current_pageno <<<"${current_page//[^0-9]/ }"
-
 current_pageno=${current_pageno:-0}
-
+last_out_file="out$current_pageno.pdf"
 next_out_file="out$((current_pageno+1)).pdf"
 
 scan() {
-  while getopts "dr:" flag; do
+  usage() {
+    echo "scanbuddy.bash scan -d -r <resolution($resolution)> -b <c|b|g>"
+  }
+
+  while getopts "dr:c:" flag; do
     case ${flag} in
      d) 
        echo "Scanning duplex"
-       source=$duplex_source
+       sides=$duplex_source
        ;;
      r)
-       echo "Resolution=$OPTARG"
        if [[ ! " ${valid_resolutions[*]} " =~ [[:space:]]${OPTARG}[[:space:]] ]]; then
-         echo "Resolution not supported"
+         echo "Resolution '$OPTARG' not supported!"
+         echo "Supported resolutions: $(printf %s "${valid_resolutions[*]}")"
          exit 1
        fi
+       resolution=$OPTARG
        ;;
-     b)
-       echo "Black and white";
+     c)
+       mode=$OPTARG
        ;;
      *)
        ;;
     esac
   done
+
+  case $mode in
+    c)
+      scanner_mode=$color_mode
+      ;;
+    b)
+      scanner_mode=$bw_mode
+      ;;
+    g)
+      scanner_mode=$grayscale_mode
+      ;;
+    *)
+      echo "Mode '$mode' not supported! Supported modes: (c)olour|(b)lack & white|(g)reyscale"
+      ;;
+  esac
+
+  echo "Scanning to '$next_out_file'..."
+  scanimage \
+    --device-name=$device \
+    --format=pdf \
+    --output-file="$next_out_file" \
+    --mode="$scanner_mode" \
+    --resolution="$resolution" \
+    --source="$sides" \
+    -x 210 -y 297 # A4 
 }
 
 case "$1" in
   scan)
     scan "${@:2}"
-    exit 0
-
-    if [ "$2" = "duplex" ]; then
-      true
-    fi
-
-    # cat <<EOF 
-    echo "Scanning to '$next_out_file'..."
-    scanimage --device-name=$device --format=pdf --output-file="$next_out_file" \
-      --mode="$scanner_mode" --resolution="$resolution" \
-      --source="$source"
+    ;;
+  unscan)
+    rm "$current_pageno"
+    ;;
+  dispatch)
     ;;
   *)
     echo "Usage: scanbuddy"