docs(usage): add more documentation

timeout

@@ -1,76 +1,101 @@
 #!/bin/sh
 
 usage() {
-	printf "Usage: %s [-t TIMEOUT] [-c COMMAND]\n\n" "$0"
-	printf "TIMEOUT and COMMAND can be set as env vars.\n"
+    printf "Usage: %s [-v] [-h] [-t TIMEOUT] [-c COMMAND]\n\n" "$0"
+}
+
+help() {
+    cat << EOH
+ SYNOPSIS
+    $0 [-v] [-h] [-t TIMEOUT] [-c COMMAND]
+
+ DESCRIPTION
+
+    \`Timeout\` executes a command until the timeout is over.
+    When the command is finished before the timeout then the exit code is \`0\` else it's \`1\`.
+
+ OPTIONS
+
+    -h    Show this help
+
+    -v    Display  the command output (stderr)
+
+    -c COMMAND
+          The command to execute
+          \`COMMAND=... $0\` works to.
+
+    -t TIMEOUT
+          The timeout in seconds (default: 10)
+          \`TIMEOUT=... $0\` works to.
+EOH
 }
 
 on_interrupt() {
-	print "Process aborted!\n"
+    print "Process aborted!\n"
 
-	exit 130
+    exit 130
 }
 
 create_script() {
-	printf "#!/bin/sh\n%s\n" "$1" > "$2"
-	chmod +x "$SCRIPT_FILE"
+    printf "#!/bin/sh\n%s\n" "$1" > "$2"
+    chmod +x "$SCRIPT_FILE"
 }
 
 run_script() {
-	if [ "$2" -eq 0 ]; then
-		"$SCRIPT_FILE" >/dev/null 2>&1 &
-	else
-		"$SCRIPT_FILE" >&2 &
-	fi
+    if [ "$2" -eq 0 ]; then
+        "$SCRIPT_FILE" >/dev/null 2>&1 &
+    else
+        "$SCRIPT_FILE" >&2 &
+    fi
 
-	printf "%d" $!
+    printf "%d" $!
 }
 
 stop_delete_script() {
-	kill -9 "$1"
-	rm -f "$2"
+    kill -9 "$1"
+    rm -f "$2"
 }
 
 check_pid() {
-	PID=$1
-	LOOP=$2
+    PID=$1
+    LOOP=$2
 
-	for _ in $(seq 1 "$((LOOP*2))"); do
-		test -d "/proc/$PID/" && sleep 0.5 || STATUS=0
-	done
+    for _ in $(seq 1 "$((LOOP*2))"); do
+        test -d "/proc/$PID/" && sleep 0.5 || STATUS=0
+    done
 
-	printf "%d" ${STATUS:-1}
+    printf "%d" ${STATUS:-1}
 }
 
 main() {
-	while getopts "ht:c:v" option; do
-		case "${option}" in
-			h) usage; exit 0;;
-			t) TIMEOUT="$OPTARG";;
-			c) COMMAND="$OPTARG";;
-			v) VERBOSE=1;;
-			*) usage; exit 1;;
-		esac
-	done
+    while getopts "ht:c:v" option; do
+        case "${option}" in
+            h) help; exit 0;;
+            t) TIMEOUT="$OPTARG";;
+            c) COMMAND="$OPTARG";;
+            v) VERBOSE=1;;
+            *) usage; exit 1;;
+        esac
+    done
 
-	TIMEOUT="${TIMEOUT:-10}"
-	VERBOSE="${VERBOSE:-0}"
+    TIMEOUT="${TIMEOUT:-10}"
+    VERBOSE="${VERBOSE:-0}"
 
-	if [ -z "$COMMAND" ]; then
-		printf "Command is required!\n"
-		exit 1
-	fi
+    if [ -z "$COMMAND" ]; then
+        printf "Command is required!\n"
+        exit 1
+    fi
 
-	SCRIPT_FILE="$(mktemp)"
+    SCRIPT_FILE="$(mktemp)"
 
-	create_script "$COMMAND" "$SCRIPT_FILE"
+    create_script "$COMMAND" "$SCRIPT_FILE"
 
-	SCRIPT_PID=$(run_script "$SCRIPT_FILE" "$VERBOSE")
-	EXIT_STATUS=$(check_pid "$SCRIPT_PID" "$TIMEOUT")
+    SCRIPT_PID=$(run_script "$SCRIPT_FILE" "$VERBOSE")
+    EXIT_STATUS=$(check_pid "$SCRIPT_PID" "$TIMEOUT")
 
-	stop_delete_script "$SCRIPT_PID" "$SCRIPT_FILE"
+    stop_delete_script "$SCRIPT_PID" "$SCRIPT_FILE"
 
-	exit "$EXIT_STATUS"
+    exit "$EXIT_STATUS"
 }
 
 trap on_interrupt INT