feat: allow tailing a specific number of log lines

README.md

@@ -41,7 +41,7 @@ mongo:link <service> <app> [--link-flags...]       # link the mongo service to t
 mongo:linked <service> <app>                       # check if the mongo service is linked to an app
 mongo:links <service>                              # list all apps linked to the mongo service
 mongo:list                                         # list all mongo services
-mongo:logs <service> [-t|--tail]                   # print the most recent log(s) for this service
+mongo:logs <service> [-t|--tail] <tail-num-optional> # print the most recent log(s) for this service
 mongo:promote <service> <app>                      # promote service <service> as MONGO_URL in <app>
 mongo:restart <service>                            # graceful shutdown and restart of the mongo service container
 mongo:start <service>                              # start a previously stopped mongo service
@@ -154,12 +154,12 @@ dokku mongo:list
 
 ```shell
 # usage
-dokku mongo:logs <service> [-t|--tail]
+dokku mongo:logs <service> [-t|--tail] <tail-num-optional>
 ```
 
 flags:
 
-- `-t|--tail`: do not stop when end of the logs are reached and wait for additional output
+- `-t|--tail [<tail-num>]`: do not stop when end of the logs are reached and wait for additional output
 
 You can tail logs for a particular service:
 
@@ -173,6 +173,12 @@ By default, logs will not be tailed, but you can do this with the --tail flag:
 dokku mongo:logs lollipop --tail
 ```
 
+The default tail setting is to show all logs, but an initial count can also be specified:
+
+```shell
+dokku mongo:logs lollipop --tail 5
+```
+
 ### link the mongo service to the app
 
 ```shell

common-functions

@@ -578,14 +578,14 @@ service_list() {
 
 service_logs() {
   declare desc="display logs for a service"
-  declare SERVICE="$1" TAIL_FLAG="$2"
+  declare SERVICE="$1" TAIL_FLAG="$2" TAIL_COUNT="$3"
   local SERVICE_ROOT="$PLUGIN_DATA_ROOT/$SERVICE"
   local ID=$(cat "$SERVICE_ROOT/ID")
   local RE_INTEGER='^[0-9]+$'
 
-  DOKKU_LOGS_ARGS="--tail 100"
+  DOKKU_LOGS_ARGS="--tail $TAIL_COUNT"
   if [[ "$TAIL_FLAG" == "-t" ]] || [[ "$TAIL_FLAG" == "--tail" ]]; then
-    DOKKU_LOGS_ARGS="--follow"
+    DOKKU_LOGS_ARGS+=" --follow"
   fi
 
   docker inspect "$ID" &>/dev/null || dokku_log_fail "Service container does not exist"

help-functions

@@ -202,6 +202,9 @@ fn-help-subcommand-args() {
     elif [[ "$arg" == *_LIST ]]; then
       arg=${arg%_*}
       args+=" <${arg//_/-}...>"
+    elif [[ "$arg" == *_OPTIONAL ]]; then
+      argName="${arg/_OPTIONAL/}"
+      args+=" [<${argName//_/-}>]"
     else
       args+=" <${arg//_/-}>"
     fi

subcommands/logs

@@ -10,16 +10,18 @@ service-logs-cmd() {
   #E dokku $PLUGIN_COMMAND_PREFIX:logs lollipop
   #E by default, logs will not be tailed, but you can do this with the --tail flag:
   #E dokku $PLUGIN_COMMAND_PREFIX:logs lollipop --tail
+  #E the default tail setting is to show all logs, but an initial count can also be specified
+  #E dokku $PLUGIN_COMMAND_PREFIX:logs lollipop --tail 5
   #A service, service to run command against
-  #F -t|--tail, do not stop when end of the logs are reached and wait for additional output
+  #F -t|--tail [<tail-num>], do not stop when end of the logs are reached and wait for additional output
   declare desc="print the most recent log(s) for this service"
   local cmd="$PLUGIN_COMMAND_PREFIX:logs" argv=("$@")
   [[ ${argv[0]} == "$cmd" ]] && shift 1
-  declare SERVICE="$1" TAIL_FLAG="$2"
+  declare SERVICE="$1" TAIL_FLAG="$2" TAIL_NUM_OPTIONAL="${3:-all}"
 
   [[ -z "$SERVICE" ]] && dokku_log_fail "Please specify a valid name for the service"
   verify_service_name "$SERVICE"
-  service_logs "$SERVICE" "$TAIL_FLAG"
+  service_logs "$SERVICE" "$TAIL_FLAG" "$TAIL_NUM_OPTIONAL"
 }
 
 service-logs-cmd "$@"