impagina: Added documentation and a --help argument

impagina

@@ -1,27 +1,59 @@
 #!/bin/sh
 
-# Initialize variables
+usage() {
-input="$1"
+	_name="$(basename "$0")"
-inputMul4="/tmp/${input%.pdf}-Mul4.pdf"
+	cat << EOF
-outputImpaginato="${input%.pdf}-Impaginato.pdf"
+Utilizzo: ${_name} [nomePDF]
-empty="/tmp/empty.pdf"
+
-n="$(pdftk "$input" dump_data | grep NumberOfPages | cut -d' ' -f2)"
+Esempi:
-
+
-# Add empty pages
+	${_name} MeccanicaRazionale.pdf
-echo .bp | groff -T pdf > "$empty"
+
-
+Per bug contattare f.minnocci@studenti.unipi.it
-pdftk F="$input" E="$empty" cat F1-$n $(for x in $(seq 1 $((4-n%4))); do printf 'E1 '; done) output "$inputMul4"
+I ringraziamenti per l'idea originale vanno a http://poisson.phc.dm.unipi.it/~dilillo
-
+EOF
-# Generate alternating page ranges
+exit $1
-n=$((n+(4-n%4)))
+}
-range=
+
-k=1
+main() {
-while [ "$k" -lt $((n/2)) ]; do
+	# Initialize variables
-	range="$range$k $((n/2+k)) $((n/2+k+1)) $((k+1)) "
+	input="$(realpath "$1")"
-	k=$((k+2))
+	basename="$(basename "$1")"
-done
+	inputMul4="/tmp/${basename%.pdf}-Mul4.pdf"
-
+	outputImpaginato="${basename%.pdf}-Impaginato.pdf"
-# Output final pdf
+	empty="/tmp/empty.pdf"
-pdftk "$inputMul4" cat $range output "$outputImpaginato"
+	echo "$input $basename $inputMul4 $outputImpaginato" > ~/log
-
+	n="$(pdftk "$input" dump_data | grep NumberOfPages | cut -d' ' -f2)"
-rm "$empty" "$inputMul4"
+
+	# Add empty pages
+	echo .bp | groff -T pdf > "$empty"
+
+	pdftk F="$input" E="$empty" cat F1-$n $(for x in $(seq 1 $((4-n%4))); do printf 'E1 '; done) output "$inputMul4"
+
+	# Generate alternating page ranges
+	n=$((n+(4-n%4)))
+	range=
+	k=1
+	while [ "$k" -lt $((n/2)) ]; do
+		range="$range$k $((n/2+k)) $((n/2+k+1)) $((k+1)) "
+		k=$((k+2))
+	done
+
+	# Output final pdf
+	pdftk "$inputMul4" cat $range output "$outputImpaginato"
+
+	rm "$empty" "$inputMul4"
+}
+
+if [ -z "$1" ] ; then
+	printf "Non hai specificato nessun file...\n\n" && usage 1
+else
+	case "$1" in
+	-h|--help)
+		usage 0 ;;
+	-*)
+		error "Opzione invalida: $1" ;;
+	*)
+		main "$@" ;;
+	esac
+fi