Mikubot-2/otouto/plugins/channel.lua

local channel = {}

local bindings = require('otouto.bindings')
local utilities = require('otouto.utilities')

function channel:init(config)
    channel.triggers = utilities.triggers(self.info.username, config.cmd_pat):t('ch', true).table
    channel.command = 'ch <channel> \\n <message>'
    channel.doc = config.cmd_pat .. [[ch <channel>
<message>

Sends a message to a channel. Channel may be specified via ID or username. Messages are markdown-enabled. Users may only send messages to channels for which they are the owner or an administrator.

The following markdown syntax is supported:
 *bold text*
 _italic text_
 [text](URL)
 `inline fixed-width code`
 `‌`‌`pre-formatted fixed-width code block`‌`‌`]]
end

function channel:action(msg, config)
    -- An exercise in using zero early returns. :)
    local input = utilities.input(msg.text)
    local output
    if input then
        local chat_id = utilities.get_word(input, 1)
        local admin_list, t = bindings.getChatAdministrators{ chat_id = chat_id }
        if admin_list then
            local is_admin = false
            for _, admin in ipairs(admin_list.result) do
                if admin.user.id == msg.from.id then
                    is_admin = true
                end
            end
            if is_admin then
                local text = input:match('\n(.+)')
                if text then
                    local success, result = utilities.send_message(chat_id, text, true, nil, true)
                    if success then
                        output = 'Your message has been sent!'
                    else
                        output = 'Sorry, I was unable to send your message.\n`' .. result.description .. '`'
                    end
                else
                    output = 'Please enter a message to be sent. Markdown is supported.'
                end
            else
                output = 'Sorry, you do not appear to be an administrator for that channel.'
            end
        else
            output = 'Sorry, I was unable to retrieve a list of administrators for that channel.\n`' .. t.description .. '`'
        end
    else
        output = channel.doc
    end
    utilities.send_reply(msg, output, true)
end

return channel