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Mikubot-2/plugins/preview.lua

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local command = 'preview <link>'
local doc = [[```
/preview <link>
Returns a full-message, "unlinked" preview.
```]]
local triggers = {
'^/preview'
}
local action = function(msg)
local input = msg.text:input()
if not input then
sendMessage(msg.chat.id, doc, true, nil, true)
return
end
input = get_word(input, 1)
if not input:match('^https?://.+') then
input = 'http://' .. input
end
local res = HTTP.request(input)
if not res then
sendReply(msg, 'Please provide a valid link.')
return
end
if res:len() == 0 then
sendReply(msg, 'Sorry, the link you provided is not letting us make a preview.')
return
end
-- Invisible zero-width, non-joiner.
local output = '[](' .. input .. ')'
sendMessage(msg.chat.id, output, false, nil, true)
end
return {
action = action,
triggers = triggers,
doc = doc,
command = command
}