fix: enhance logs.sh to support tailing logs with options and improve usage instructions

production/scripts/logs.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # View ERPNext Logs Script
-# Usage: ./logs.sh [service-number-or-name]
+# Usage: ./logs.sh [service-number-or-name] [--tail[=N]]
 
 # Colors
 RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
@@ -13,21 +13,37 @@ echo_error() { echo -e "${RED}[ERROR]${NC} $1"; }
 # Navigate to production directory
 cd "$(dirname "$(dirname "${BASH_SOURCE[0]}")")" || exit 1
 
-# Show menu only if no argument provided
-if [ -z "$1" ]; then
-    echo_info "Available services:"
-    echo "  1. backend      2. frontend     3. websocket"
-    echo "  4. queue-short  5. queue-long   6. scheduler   7. all"
-    read -p "Enter number or name: " INPUT
-else
-    INPUT=$1
-fi
+FOLLOW_MODE="follow"
+TAIL_LINES=200
+SERVICE_ARG=""
 
-# Map input to service name
-case "$INPUT" in
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --tail)
+      FOLLOW_MODE="tail"
+      if [[ "${2:-}" =~ ^[0-9]+$ ]]; then
+        TAIL_LINES=$2
+        shift 2
+        continue
+      fi
+      shift
+      ;;
+    --tail=*)
+      FOLLOW_MODE="tail"
+      VALUE="${1#*=}"
+      [[ "$VALUE" =~ ^[0-9]+$ ]] || { echo_error "--tail expects an integer"; exit 1; }
+      TAIL_LINES=$VALUE
+      shift
+      ;;
+    --lines)
+      [[ "${2:-}" =~ ^[0-9]+$ ]] || { echo_error "--lines expects an integer"; exit 1; }
+      TAIL_LINES=$2
+      FOLLOW_MODE="tail"
+      shift 2
+      ;;
     -h|--help)
-        cat << EOF
-Usage: $0 [service-number-or-name]
+      cat << EOF
+Usage: $0 [service-number-or-name] [--tail[=N]]
 
 Services:
   1 or backend       - Gunicorn backend
@@ -38,14 +54,41 @@ Services:
   6 or scheduler     - Background scheduler
   7 or all           - All services
 
+Flags:
+  --tail[=N]         Show the last N (default 200) log lines and exit
+  --lines N          Alias for --tail=N
+  -h, --help         Show this help
+
 Examples:
-  $0                 # Interactive menu
-  $0 1               # View backend logs
-  $0 backend         # Same as above
-  $0 all             # View all logs
+  $0                 # Interactive menu (follow)
+  $0 backend         # Follow backend logs
+  $0 backend --tail 50   # Show last 50 backend log lines
+  $0 --tail          # Show last 200 lines for all services
 EOF
-        exit 0
-        ;;
+      exit 0
+      ;;
+    *)
+      SERVICE_ARG="$1"
+      shift
+      ;;
+  esac
+done
+
+if [[ -z "$SERVICE_ARG" ]]; then
+  if [[ "$FOLLOW_MODE" == "tail" ]]; then
+    INPUT="all"
+  else
+    echo_info "Available services:"
+    echo "  1. backend      2. frontend     3. websocket"
+    echo "  4. queue-short  5. queue-long   6. scheduler   7. all"
+    read -p "Enter number or name: " INPUT
+  fi
+else
+  INPUT="$SERVICE_ARG"
+fi
+
+# Map input to service name
+case "$INPUT" in
     1|backend) SERVICE="backend" ;;
     2|frontend) SERVICE="frontend" ;;
     3|websocket) SERVICE="websocket" ;;
@@ -60,6 +103,11 @@ esac
 docker ps | grep -q "erpnext-production" || { echo_error "ERPNext is not running!"; exit 1; }
 
 # Show logs
-echo_info "Logs for: $SERVICE (Ctrl+C to exit)"
+echo_info "Logs for: $SERVICE"
 [ "$SERVICE" = "all" ] && SERVICE=""
-docker compose --project-name erpnext-production -f production.yaml logs -f $SERVICE
+if [[ "$FOLLOW_MODE" == "follow" ]]; then
+  echo_info "Streaming (Ctrl+C to exit)"
+  docker compose --project-name erpnext-production -f production.yaml logs -f $SERVICE
+else
+  docker compose --project-name erpnext-production -f production.yaml logs --tail "$TAIL_LINES" $SERVICE
+fi