Added list option

CentOS/7-Days-To-Die/7D2D-Manage.bash

@@ -82,7 +82,8 @@ start_server() {
   server_session_name="${prefix}-${server_name}"
 
   [[ ! -d "${server_directory}" ]] &&
-    log "error" "Unable to find the server directory for $(important "${server_name}")"
+    log "error" "Unable to find the server directory for $(important "${server_name}")" &&
+    return 1
 
 
   local server_port
@@ -178,7 +179,7 @@ kill_server() {
     log "info" "Stopped $(important "${prefix}-Server-${server_id}")"
     return 0
   else
-    log "error" "Could not find $(important "${prefix}-Server-${server_id}") or unable to shut down ${prefix}-Server-${server_id}"
+    log "error" "$(important "${prefix}-Server-${server_id}") is not running"
     return 1
   fi
 }
@@ -295,6 +296,71 @@ update() {
 
 }
 
+list_servers() {
+  local picked_option
+  picked_option=""
+  while :; do
+    case ${1} in
+    -h | -\? | --help)
+      printf "Usage: %s\n" \
+"list [OPTIONS]
+  --running | -r 
+    Lists the currently running 7 Days To Die Servers
+
+    Example:
+      --running
+  --installed | -i
+    Lists the currently installed 7 Days To Die Servers
+
+    Example:
+      --installed"
+      exit
+      ;;
+    --) # End of all options.
+      break
+      ;;
+    --running | -r)
+      picked_option=0
+      ;;
+    --installed | -i)
+      picked_option=1
+      ;;
+    -?*)
+      printf 'Unknown option: %s\n' "$1" >&2
+      return 1
+      ;;
+    *) # Default case: No more options, so break out of the loop.
+      break ;;
+    esac
+    shift
+  done
+  
+  [[ -z "${picked_option}" ]] &&
+      log "error" "An option must be passed for list, check list -h" &&
+      return 1
+
+  if (( picked_option == 0 )); then
+    log "debug" "Listing running servers"
+    local tmux_sessions
+    tmux_sessions="$(tmux list-sessions)" >/dev/null 2>&1
+    if [[ ! "${?}" -eq "0" ]]; then
+      important "No servers currently running."
+    fi
+    while read -r; do
+      if [[ "${REPLY}" = *"-Server-"* ]]; then
+        local running_server
+        running_server="$(echo "${REPLY}" | cut -d ":" -f1)"
+        important "${running_server}"
+      fi
+    done <<< "${tmux_sessions}"
+  elif (( picked_option == 1 )); then
+    log "debug" "Listing installed servers"
+    while read -r; do
+      important "${BASE_DIR}/${REPLY}"
+    done <<< "$(find "${BASE_DIR}" -name "startserver.sh" | cut -d "/" -f5)"
+  fi
+}
+
 usage() {
   # Print out usage instructions for the local script
   #
@@ -316,7 +382,9 @@ usage() {
   install
     Exposes options to install 7 Days To Die Servers, pass -h to it for details
   update
-    Exposes options to update 7 Days To Die Servers, pass -h to it for details"
+    Exposes options to update 7 Days To Die Servers, pass -h to it for details
+  list
+    Exposes options to list 7 Days To Die Servers, pass -h to it for details"
 }
 
 
@@ -363,6 +431,11 @@ main() {
       update "$@"
       break
       ;;
+    list | l)
+      shift
+      list_servers "$@"
+      break
+      ;;
     -?*)
       printf "Unknown option: %s\n" "$1" >&2
       usage