write the program

README.md

@@ -1,3 +1,13 @@
 # mhwnews
 
-Script to convert Monster Hunter World's news.json into an RSS feed
+Script to convert Monster Hunter World's news.json into an RSS feed
+
+## Dependencies
+
+- lua
+- lua-cjson
+- curl
+
+## Usage
+
+    lua mhwnews.lua output.rss.xml

mhwnews.lua

@@ -0,0 +1,55 @@
+#!/usr/bin/env lua
+local json = require "cjson"
+local tA = {...}
+
+local mhwurl = tA[2] or "https://www.monsterhunter.com/world-iceborne/pc/assets/data/us/news.json"
+local title = "Unofficial Monster Hunter World News"
+local jsf = os.tmpname()
+os.execute(string.format("curl -so '%s' '%s'",jsf,mhwurl))
+local f = io.open(jsf,"rb")
+if not f then error("unable to open file for reading: "..jsf) end
+local c = f:read("*a")
+f:close()
+os.execute(string.format("rm '%s'",jsf))
+local jt = json.decode(c)
+local f = io.open(tA[1],"wb")
+if not f then error("unable to open file for writing: "..tA[1]) end
+f:write(string.format([[<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0">
+<channel>
+ <title>%s</title>
+ <link>https://www.monsterhunter.com/world-iceborne/pc/us/</link>
+ <lastBuildDate>%s</lastBuildDate>
+ <ttl>1440</ttl>
+]], title, os.date("%a, %d %b %Y %H:%M:%S %z")))
+for k,v in pairs(jt.topics) do
+ if v.link:sub(1,8) ~= "https://" then
+  v.link = "https://www.monsterhunter.com/" .. v.link
+ end
+ local p = io.popen(string.format("curl -sI '%s' | grep last-modified",v.link))
+ local c = p:read("*a")
+ p:close()
+ mdate = c:match(": ([^\r\n]+)")
+ if mdate then
+ f:write(string.format([[ <item>
+  <title>%s</title>
+  <description><img src="https://www.monsterhunter.com/world-iceborne/pc/%s"></img></description>
+  <link>%s</link>
+  <guid>%s</guid>
+  <pubDate>%s</pubDate>
+ </item>
+]], v.text, v.img, v.link, v.link, mdate))
+ else
+ f:write(string.format([[ <item>
+  <title>%s</title>
+  <description><img src="https://www.monsterhunter.com/world-iceborne/pc/%s"></img></description>
+  <link>%s</link>
+  <guid>%s</guid>
+ </item>
+]], v.text, v.img, v.link, v.link))
+ end
+end
+
+f:write([[</channel>
+</rss>]])
+f:close()