docs: tighten mtm-ddwipe help and project guidance

.continue/rules/project.md

@@ -16,8 +16,9 @@ description: mtm-ddwipe project conventions
 - Keep the host and line-number removal behavior intact.
 - `mtm-ddwipe` must print a usage line and support `-h`/`--help`.
 - Validate that wipe targets are real block devices before operating on them.
-- Prefer explicit, short confirmation prompts before destructive operations.
+- Keep short, explicit confirmation prompts before destructive operations.
 - Keep error and help messages short, clear, and in English.
+- Keep help text concise and usage-first.
 
 # Project identity
 - Main script: `mtm-ddwipe`

mtm-ddwipe

@@ -5,21 +5,35 @@ declare STARTDATE=""
 declare STARTDATESTRING=""
 
 show_help() {
-	echo "ddwipe dev (/dev/sdX)"
+	echo "Usage: mtm-ddwipe DEVICE"
 	echo ""
+	echo "Wipe a block device."
 	echo "Version: 0.0.3"
 }
 
 check_args() {
-	if [ "${1}" == "" ]; then
+	case "${1}" in
+		-h|--help)
+			show_help
+			exit 0
+			;;
+		"")
 			show_help
 			exit 1
-	fi
+			;;
+	esac
 }
 
 check_dev_exist() {
 	if [ ! -e "${1}" ]; then
-		echo "${1} is missing."
+		echo "Missing device."
+		exit 1
+	fi
+}
+
+check_dev_block() {
+	if [ ! -b "${1}" ]; then
+		echo "Not a block device."
 		exit 1
 	fi
 }
@@ -63,7 +77,7 @@ wipe_dev() {
 		fi
 	fi
 	echo ""
-	echo "Device ${1} wipped !"
+	echo "Device ${1} wiped."
 }
 
 print_time() {
@@ -84,6 +98,7 @@ print_time() {
 
 check_args "${DEV}"
 check_dev_exist "${DEV}"
+check_dev_block "${DEV}"
 confirm_wipe "${DEV}"
 wipe_dev "${DEV}"
 print_time