Originally Posted by Baertram

Thanks for the addon.

One thing: You should not use the hard values like 31 for your message type but use the ZOs defined constants, as the values might change in the future (some did already).

The constants can be found in the esouidocumentation_pxx.txt file, provided here:
https://wiki.esoui.com/APIVersion#live_API_version

Check the actual live API version and the txt link is at the line "API TXT Documentation".
You have hooked the function FormatAndAddChatMessage, which is using the parameter

So the constants are listed below the headline "MsgChannelType" (h5. MsgChannelType)
CHAT_CHANNEL_ZONE
You can find the values to the constants by either trying /tb CHAT_CHANNEL_ZONE or /zgoo CHAT_CHANNEL_ZONE ingame (if you install merTorchbug or zgoo. merTorchbug also got a total list of globals + their values! You just need to type /tb and thens elect the globals tab to see and search them).


Another important hint:
As you prehook the chat function FormatAndAddChatMessage, which will be used for all kind of events for the chat (not only EVENT_CHAT_MESSAGE_CHANNEL !) as you can see here https://github.com/esoui/esoui/blob/...dlers.lua#L211
At this line the different chat events will be registered to call the OnChatEvent function: https://github.com/esoui/esoui/blob/...dlers.lua#L224
It can be EVENT_CHAT_MESSAGE_CHANNEL , or any other which is passed in by eventKey via function ZO_ChatRouter:RegisterMessageFormatter(eventKey, messageFormatter).

So you should make sure that you check if the eventKey in your callback function is EVENT_CHAT_MESSAGE_CHANNEL, and not any other event that fires and tries to find the messageType and text, but maybe does not provide these parameters.


Third hint/compatibility issues:
If you prehook a function and return true the standard code etc. won't be run anymore. Works fine to prevent such messages in the chat, right. But will most likely break other addons that want to use these texts.
In your case it's valid as the addon's purpose is to suppress those messages.

But there are other addons like pChat and rChar or even LibChatMessage which try to save the chat history. Maybe these entries should be kept in the history, but your addon is stripping the messages before.
So you could use your txt file and entries like

to assure the other addons get loaded before your addon and maybe also add their chat handlers and the history stuff before, so that they will keep the messages, and your addon is just hiding the message afterwards in chat as the standard eso function is not run at the end, due to your return true in the PreHook.

I did not test pChar/rChat if anything is broken if your addon is enabled, so this is just an info to tell you what was happening in the past, and what could be done (but needs testing!).