Begin library-friendly structuring

otouto/plugins/apod.lua

@@ -0,0 +1,87 @@
+ -- Credit to Heitor (tg:Wololo666; gh:heitorPB) for this plugin.
+
+local apod = {}
+
+local HTTPS = require('ssl.https')
+local JSON = require('dkjson')
+local URL = require('socket.url')
+local utilities = require('utilities')
+
+apod.command = 'apod [date]'
+
+function apod:init(config)
+	apod.triggers = utilities.triggers(self.info.username, config.cmd_pat)
+		:t('apod', true):t('apodhd', true):t('apodtext', true).table
+	apod.doc = [[```
+]]..config.cmd_pat..[[apod [query]
+Returns the Astronomy Picture of the Day.
+If the query is a date, in the format YYYY-MM-DD, the APOD of that day is returned.
+]]..config.cmd_pat..[[apodhd [query]
+Returns the image in HD, if available.
+]]..config.cmd_pat..[[apodtext [query]
+Returns the explanation of the APOD.
+Source: nasa.gov
+```]]
+end
+
+function apod:action(msg, config)
+
+	if not config.nasa_api_key then
+		config.nasa_api_key = 'DEMO_KEY'
+	end
+
+	local input = utilities.input(msg.text)
+	local date = '*'
+	local disable_page_preview = false
+
+	local url = 'https://api.nasa.gov/planetary/apod?api_key=' .. config.nasa_api_key
+
+	if input then
+		if input:match('(%d+)%-(%d+)%-(%d+)$') then
+			url = url .. '&date=' .. URL.escape(input)
+			date = date .. input
+		else
+			utilities.send_message(self, msg.chat.id, apod.doc, true, msg.message_id, true)
+			return
+		end
+	else
+		date = date .. os.date("%F")
+	end
+
+	date = date .. '*\n'
+
+	local jstr, res = HTTPS.request(url)
+	if res ~= 200 then
+		utilities.send_reply(self, msg, config.errors.connection)
+		return
+	end
+
+	local jdat = JSON.decode(jstr)
+
+	if jdat.error then
+		utilities.send_reply(self, msg, config.errors.results)
+		return
+	end
+
+	local img_url = jdat.url
+
+	if string.match(msg.text, '^'..config.cmd_pat..'apodhd*') then
+		img_url = jdat.hdurl or jdat.url
+	end
+
+	local output = date .. '[' .. jdat.title  .. '](' .. img_url .. ')'
+
+	if string.match(msg.text, '^'..config.cmd_pat..'apodtext*') then
+		output = output .. '\n' .. jdat.explanation
+		disable_page_preview = true
+	end
+
+	if jdat.copyright then
+		output = output .. '\nCopyright: ' .. jdat.copyright
+	end
+
+	utilities.send_message(self, msg.chat.id, output, disable_page_preview, nil, true)
+
+end
+
+return apod