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Mikubot-2/plugins/preview.lua

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