Implemented update option

generate.sh

@@ -1,30 +1,59 @@
 #!/bin/bash
-# @see https://faceted.wordpress.com/2010/07/11/how-to-extract-text-from-pdf-files-using-poppler-and-gocr-on-ubuntu/
+# @author Kevin Veen-Birkenbach
 # @param $1 Working directory
 # @param $2 language
+# @param $3 mode (update,initialize)
 # sudo pacman -Syyu tesseract-data-deu tesseract-data-en tesseract
 if [ -z "$2" ]
   then
-		echo "You need to define an working directory" && exit 1;
+		echo "You need to define an working directory and a language" && exit 1;
+fi
+if [ -z "$3" ]
+  then
+		MODE="initialize"
+	else
+		if [ "$3" != "update" ]
+			then
+				echo "Unknown option: $3" && exit 1
+		fi
+		MODE="$3"
 fi
 TMP_FOLDER="$(mktemp -d)/" &&
 ORIGIN_FOLDER="$1/origin/" &&
-OUTPUT_FOLDER="$1/generated/" &&
-echo "Cleaning up $OUTPUT_FOLDER..." &&
-rm -v "$OUTPUT_FOLDER"* || exit 1;
+OUTPUT_FOLDER="$1/generated/" || exit 1
+if [ "$MODE" = "update" ]; then
+	echo "Updating bills..."
+else
+	if [ "$(ls -A "$TMP_FOLDER")" ]
+		then
+			echo "Cleaning up $OUTPUT_FOLDER..."
+			rm -v "$OUTPUT_FOLDER"* || exit 1;
+		else
+			echo "$OUTPUT_FOLDER is allready cleaned up!"
+		fi
+fi
 for origin_file in "$ORIGIN_FOLDER"*.*; do
-	if [ "$(head -c 4 "$origin_file")" = "%PDF" ]; then
-		tmp_file="$TMP_FOLDER$(basename "$origin_file")"
-		echo "Generating $tmp_file..."
-		pdfimages "$origin_file" "$tmp_file"
+	if [ "$MODE" = "update" ] && [ "$(test -f "$OUTPUT_FOLDER$(basename "$origin_file")"*)" ] || [ "$MODE" = "initialize" ]; then
+		if [ "$(head -c 4 "$origin_file")" = "%PDF" ]; then
+			tmp_file="$TMP_FOLDER$(basename "$origin_file")"
+			echo "Generating $tmp_file..."
+			pdfimages "$origin_file" "$tmp_file"
+		else
+			cp -v "$origin_file" "$TMP_FOLDER"
+		fi
 	else
-		cp -v "$origin_file" "$TMP_FOLDER"
+		echo "Skipped $origin_file..."
 	fi
 done
-for tesseract_input_file in "$TMP_FOLDER"*.*; do
-	txt_output_file_without_suffix="$OUTPUT_FOLDER$(basename "$tesseract_input_file")";
-	echo "Generating $txt_output_file_without_suffix.txt..."
-	tesseract -l "$2" "$tesseract_input_file" "$txt_output_file_without_suffix";
-	echo "file content:"
-	cat "$txt_output_file_without_suffix.txt"
-done
+if [ "$(ls -A "$TMP_FOLDER")" ]
+	then
+		for tesseract_input_file in "$TMP_FOLDER"*.*; do
+			txt_output_file_without_suffix="$OUTPUT_FOLDER$(basename "$tesseract_input_file")";
+			echo "Generating $txt_output_file_without_suffix.txt..."
+			tesseract -l "$2" "$tesseract_input_file" "$txt_output_file_without_suffix";
+			echo "file content:"
+			cat "$txt_output_file_without_suffix.txt"
+		done
+	else
+		echo "Skipped text generation because $TMP_FOLDER is empty..."
+fi