No problem. Thanks for the comment.
ok - 20 minutes 
Here is an alternative version that uses ansi-to-html
NOTE:
You will need node-red V1.3.x as this demo uses function external modules
[{"id":"270e0d17.f1c9b2","type":"ui_template","z":"553814a2.1248ec","group":"6d01ec93.b1d374","name":"","order":7,"width":"12","height":"8","format":"\n<div id=\"shell\" style=\"font-family: monospace;\"></div>\n\n<script>\n(function(scope) {\n scope.$watch('msg', function(msg) {\n if (msg) {\n debugger\n $(\"#shell\").html(msg.payload);\n $(\"#shell\").closest(\".nr-dashboard-template\").scrollTop(function() { return this.scrollHeight; });\n }\n });\n})(scope);\n</script>","storeOutMessages":true,"fwdInMessages":true,"resendOnRefresh":true,"templateScope":"local","x":880,"y":2020,"wires":[[]]},{"id":"3e727ae4.147346","type":"exec","z":"553814a2.1248ec","command":"","addpay":"payload","append":"","useSpawn":"false","timer":"","oldrc":false,"name":"","x":630,"y":2100,"wires":[["195bbabe.711bb5"],[],[]]},{"id":"4d08470d.865218","type":"ui_button","z":"553814a2.1248ec","name":"","group":"6d01ec93.b1d374","order":3,"width":"3","height":"1","passthru":false,"label":"time /T","tooltip":"","color":"","bgcolor":"","icon":"","payload":"time /T","payloadType":"str","topic":"topic","topicType":"msg","x":350,"y":2020,"wires":[["3e727ae4.147346","195bbabe.711bb5"]]},{"id":"195bbabe.711bb5","type":"function","z":"553814a2.1248ec","name":"","func":"\nif(!msg.payload) return;\nvar convert = new ansiToHtml();\nconst CR = '\\r';\nconst LF = '\\n';\nconst CRLF = CR+LF;\nlet input = msg.payload + \"\";\ninput = input.replace(new RegExp(CR, 'g'), LF)\ninput = input.replace(new RegExp(CRLF, 'g'), LF)\n\nconst MAXLINES = 200;\nlet data = context.get(\"data\") || [];\nif(msg.topic==\"clear\") {\n data = [];\n} else {\n const lines = input.split(LF);\n data.push(...lines)\n data = data.slice(-MAXLINES);\n}\ncontext.set(\"data\", data);\n\nvar html = convert.toHtml(data.join(\"<br>\"))\nmsg.payload = html;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[{"var":"ansiToHtml","module":"ansi-to-html"}],"x":700,"y":2020,"wires":[["270e0d17.f1c9b2"]]},{"id":"aacf91fd.8dbd3","type":"ui_button","z":"553814a2.1248ec","name":"","group":"6d01ec93.b1d374","order":4,"width":"3","height":"1","passthru":false,"label":"where node","tooltip":"","color":"","bgcolor":"","icon":"","payload":"where node","payloadType":"str","topic":"topic","topicType":"msg","x":370,"y":2060,"wires":[["3e727ae4.147346","195bbabe.711bb5"]]},{"id":"16e0554b.d16f7b","type":"ui_button","z":"553814a2.1248ec","name":"","group":"6d01ec93.b1d374","order":5,"width":"3","height":"1","passthru":false,"label":"demo ANSI","tooltip":"","color":"","bgcolor":"","icon":"","payload":"where cmd","payloadType":"str","topic":"topic","topicType":"msg","x":370,"y":1960,"wires":[["55a5d564.95fd5c"]]},{"id":"ca6518ec.ca9f78","type":"ui_button","z":"553814a2.1248ec","name":"","group":"6d01ec93.b1d374","order":6,"width":"3","height":"1","passthru":false,"label":"clear","tooltip":"","color":"","bgcolor":"","icon":"","payload":"","payloadType":"str","topic":"clear","topicType":"str","x":350,"y":2140,"wires":[["195bbabe.711bb5"]]},{"id":"14e64a77.db0856","type":"inject","z":"553814a2.1248ec","name":"demo ANSI colrs","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":380,"y":1920,"wires":[["55a5d564.95fd5c"]]},{"id":"55a5d564.95fd5c","type":"function","z":"553814a2.1248ec","name":"","func":"\nvar convert = new ansiToHtml();\n\nmsg.payload = `\\x1b[30mblack\\x1b[37mwhite\nnew line\nanother \\u001b[31mnew\\u001b[0m line\na new line with \\u001b[31mcolor\\u001b[0m embeded`\n\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[{"var":"ansiToHtml","module":"ansi-to-html"}],"x":560,"y":1960,"wires":[["195bbabe.711bb5"]]},{"id":"6d01ec93.b1d374","type":"ui_group","name":"UserEntry","tab":"5132060d.4cde48","order":2,"disp":true,"width":"12","collapse":false},{"id":"5132060d.4cde48","type":"ui_tab","name":"Home","icon":"dashboard","disabled":false,"hidden":false}]
Woah, that's fast! Thank you @Steve-Mcl for updating the flow.
Actually, I just edited it to set the font mono-spaced (better for terminal - you might want to re-import the flow from previous thread. Up to you.
Hi again @Steve-Mcl , I upgraded my node-red to run your flow but it still says -
ReferenceError: ansiToHtml is not defined
However, I am unclear why it is says so because I can clearly see ansi-to-html module in /home/pi/.node-red/node_modules.
I have tried installing it using npm as well as manually by cloning the git repo but still, no luck. I understand that you are calling a function ansiToHtml() in the function nodes but that does not seem to work for me. Do you have any idea how to fix this?
My node-red and node.js version info is as follows:
7 Jun 14:43:59 - [info] Node-RED version: v1.3.5
7 Jun 14:43:59 - [info] Node.js version: v12.22.0
7 Jun 14:43:59 - [info] Linux 5.10.17-v7l+ arm LE
7 Jun 14:43:59 - [info] Loading palette nodes
7 Jun 14:44:01 - [info] Dashboard version 2.28.2 started at /
7 Jun 14:44:01 - [info] Settings file : /home/pi/.node-red/settings.js
7 Jun 14:44:01 - [info] HTTP Static : /home/pi/.node-red/static
7 Jun 14:44:01 - [info] Context store : 'default' [module=memory]
7 Jun 14:44:01 - [info] User directory : /home/pi/.node-red
7 Jun 14:44:01 - [warn] Projects disabled : editorTheme.projects.enabled=false
7 Jun 14:44:01 - [info] Flows file : /home/pi/.node-red/flows_rss-01.json
7 Jun 14:44:02 - [info] Server now running at http://127.0.0.1:1880/admin/
Did you enable function external modules ?
You don't install that package into node-red node_modules you use the "setup" tab on the function node to add the package.
I understand now that I had not configured the function node. However, I cannot see functionExternalModules in my settings.js file. As mentioned earlier, I am running node-red 1.3.5. Has the name changed by any chance? I am uploading my settings file as .txt for reference.
settings.txt (12.9 KB)
Just add functionExternalModules: true in the settings.
Be sure to add a comma before or after depending on where you add it.
Ok, now it works! Thank you for the help in debugging.
