telegram-chat: read file content...

... instead of getting it. This lifts the size limit, though we are
still limited by Telegram message size.

This requires RouterOS 7.13.

doc/telegram-chat.md

@@ -4,7 +4,7 @@ Chat with your router and send commands via Telegram bot
 [![GitHub stars](https://img.shields.io/github/stars/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=red)](https://github.com/eworm-de/routeros-scripts/stargazers)
 [![GitHub forks](https://img.shields.io/github/forks/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=green)](https://github.com/eworm-de/routeros-scripts/network)
 [![GitHub watchers](https://img.shields.io/github/watchers/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=blue)](https://github.com/eworm-de/routeros-scripts/watchers)
-[![required RouterOS version](https://img.shields.io/badge/RouterOS-7.12-yellow?style=flat)](https://mikrotik.com/download/changelogs/)
+[![required RouterOS version](https://img.shields.io/badge/RouterOS-7.13-yellow?style=flat)](https://mikrotik.com/download/changelogs/)
 [![Telegram group @routeros_scripts](https://img.shields.io/badge/Telegram-%40routeros__scripts-%2326A5E4?logo=telegram&style=flat)](https://t.me/routeros_scripts)
 [![donate with PayPal](https://img.shields.io/badge/Like_it%3F-Donate!-orange?logo=githubsponsors&logoColor=orange&style=flat)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=A4ZXBD6YS2W8J)
 
@@ -130,9 +130,8 @@ send information on its own. Something like this should do the job:
 
 ### Output size
 
-RouterOS is limited in reading file content to a size of about four
-kilobytes. Reading larger files does just fail, and that is also the limit
-for command output.
+Telegram messages have a limit of 4096 characters. If output is too large it
+is truncated, and a warning is added to the message.
 
 ### Sending commands to a group
 

global-functions.rsc

@@ -12,7 +12,7 @@
 :local ScriptName [ :jobname ];
 
 # expected configuration version
-:global ExpectedConfigVersion 125;
+:global ExpectedConfigVersion 126;
 
 # global variables not to be changed by user
 :global GlobalFunctionsReady false;

news-and-changes.rsc

@@ -50,6 +50,7 @@
   123="Introduced new function '\$LogPrint', and deprecated '\$LogPrintExit2'. Please update custom scripts if you use it.";
   124="Added support for links in 'netwatch-notify', these are added below the formatted notification text.";
   125=("April's Fool! " . [ $SymbolForNotification "smiley-partying-face" ] . "Well, you missed it... - no charge nor fees. (Anyway... Donations are much appreciated, " . [ $SymbolForNotification "smiley-smiling-face" ] . "thanks!)");
+  126="Made 'telegram-chat' capable of handling large command output. Telegram messages still limit the size, so it is truncated now.";
 };
 
 # Migration steps to be applied on script updates

telegram-chat.rsc

@@ -3,7 +3,7 @@
 # Copyright (c) 2023-2024 Christian Hesse <mail@eworm.de>
 # https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
 #
-# requires RouterOS, version=7.12
+# requires RouterOS, version=7.13
 #
 # use Telegram to chat with your Router and send commands
 # https://git.eworm.de/cgit/routeros-scripts/about/doc/telegram-chat.md
@@ -141,14 +141,13 @@
             :if ([ :len [ /file/find where name=($File . ".failed") ] ] > 0) do={
               :set State ([ $SymbolForNotification "cross-mark" ] . "The command failed with an error!\n\n");
             }
-            :local Content [ /file/get $File contents ];
+            :local Content ([ /file/read chunk-size=32768 file=$File as-value ]->"data");
             $SendTelegram2 ({ origin=$ScriptName; chatid=($Chat->"id"); silent=true; replyto=($Message->"message_id"); \
               subject=([ $SymbolForNotification "speech-balloon" ] . "Telegram Chat"); \
               message=([ $SymbolForNotification "gear" ] . "Command:\n" . $Message->"text" . "\n\n" . \
                 $State . [ $IfThenElse ([ :len $Content ] > 0) \
-                ([ $SymbolForNotification "memo" ] . "Output:\n" . $Content) [ $IfThenElse ([ /file/get $File size ] > 0) \
-                ([ $SymbolForNotification "warning-sign" ] . "Output exceeds file read size.") \
-                ([ $SymbolForNotification "memo" ] . "No output.") ] ]) });
+                ([ $SymbolForNotification "memo" ] . "Output:\n" . $Content) \
+                ([ $SymbolForNotification "memo" ] . "No output.") ]) });
             /file/remove "tmpfs/telegram-chat";
           } else={
             $LogPrint info $ScriptName ("The command from update " . $UpdateID . " failed syntax validation!");