implemented basic structure and check()

src/sub/transfer.sh

@@ -1,3 +1,89 @@
 #!/bin/bash
 
-echo "unimplemented"
+check(){
+	if command -v rsync &>/dev/null
+	then
+		echo "rsync is installed. Check passed. Bye."
+		exit 0;
+	else
+		echo "Please install rsync."
+		while [[ -z "$HAD_BEST_SUCCESS" ]]; do
+			read -p "Install now? [y/N] " QUESTION
+			if [[ -z "$QUESTION" ]] || [[ "$QUESTION" = "n" ]] || [[ "$QUESTION" = "N" ]]; then
+				echo "Alright, bye."
+				exit 0;
+			fi
+			if [[ "$QUESTION" = "y" ]] || [[ "$QUESTION" = "Y" ]]; then
+				HAD_BEST_SUCCESS="true"
+				echo "Trying to install rsync..."
+				if command -v apt &>/dev/null
+				then
+					sudo apt update
+					sudo apt install rsync -y
+					echo "Attempted to install rsync. Please execute the check again. Bye."
+					exit 0;
+				fi
+
+				if command -v dnf &>/dev/null
+				then
+					sudo dnf update
+					sudo dnf install rsync -y
+					echo "Attempted to install rsync. Please execute the check again. Bye."
+					exit 0;
+				fi
+
+				if command -v pacman &>/dev/null
+				then
+					sudo pacman -S rsync
+					echo "Attempted to install rsync. Please execute the check again. Bye."
+					exit 0;
+				fi
+			fi
+		done
+
+
+
+	fi
+}
+
+backup(){
+	exit 0;
+}
+
+transfer(){
+	exit 0;
+}
+
+
+show_help(){
+	echo "-- HELP --"
+	echo "  -y                     | Answer all questions with yes"
+	echo "  -s SOURCE              | Source path (e.g. /srv/fileshare/main/)"
+	echo "  -d DESTINATION         | Destination path (e.g. using ssh)"
+	echo "  -b                     | Transfer as backup"
+	echo "  -e                     | encrypt destination using a key"
+	echo "  -h                     | Show this help text"
+	echo "  -v                     | Get Version Info"
+	echo "  -c                     | Check the usability of this tool"
+	exit 0
+}
+
+while getopts ":s:d:Bvhyc" opt; do
+	case $opt in
+		s) SOURCE="$OPTARG";;
+		d) DESTINATION="$OPTARG";;
+		v) exit 0 ;;
+		c) check ;;
+		e) ENCRYPT="1" ;;
+		b) backup ;;
+		h) show_help ;;
+		y) ALWAYS_YES="1" ;;
+		\?) echo "Unknown option: -$OPTARG" >&2; exit 1 ;;
+		:) echo "Option -$OPTARG needs an argument" >&2; exit 1 ;;
+	esac
+done
+
+transfer
+
+echo "Nothing to do."
+exit 0