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[REBOL] Re: REBOL Script to convert REBOL format to RSS XML

From: premshree:pillai:g:mail at: 31-Dec-2004 14:24

Hi Gregg, This looks nice. Thanks! :) Some rework may be required for the pubDate, though. The to-idate returns something like "Thu, 30 Dec 2004 0:00 +0000". For it to be validated, it must be "Thu, 30 Dec 2004 00:00:00 +0000". The change is required in the time, that is. It's a minor problem, though. If anybody's interested in further hacking, these URLs could be useful: * RSS 2.0 specification: http://blogs.law.harvard.edu/tech/rss * Valid date types for RSS 2.0: http://feedvalidator.org/docs/error/InvalidRFC2822Date.html On Thu, 30 Dec 2004 17:12:12 -0700, Gregg Irwin <[greggirwin--mindspring--com]> wrote:
> Hi Premshree, > > PP> Anyway, I wrote a small script that generates valid RSS 2.0 feeds from > PP> the REBOL data for Carl's blog. The code is available here: > PP> http://premshree.seacrow.com/code/rebol/carl-rss.r/download > > Very cool! > > PP> If there are improvements possible, please point so/do so. :) > > I did a quick re-hack of things, just to show you some different > approaches. Others may chime in with more thoughts as well. Some of > the things I thought about when evaluating your code: > > * Use path notation instead of SELECT > > * Don't use temporary vars if you don't need to > > * Tags are a valid datatype, you don't need to make them strings > > * JOIN (and REJOIN) build new strings, meaning lots of allocation > and work for the GC. INSERT, APPEND, and their ilk just add on > to an existing series; also saves reassigning the value. > > * See what refinements date! values offer to see if you need to > convert them to strings to do what you want. > > * REPEAT is faster than FOR if you're going from 1 and > incrementing by 1. FOREACH makes things even easier most times. > > I did a couple more advanced things in there (note the tick on the > MAKE-ENTRY 'key parameter) and did some others to give you some things > to take apart and think about. Holler away if you have questions. > > BTW, this was a very quick hack, so I don't know if, for example, > TO-IDATE gives a valid format as far as RSS is concerned. > > -- Gregg > > REBOL [ > Title: "RSS Generator for Carl's Blog" > Date: 31-Dec-2004 > File: %carl-rss.r > Home: http://www.livejournal.com/~premshree > Author: ["Premshree Pillai" "Gregg Irwin"] > Version: 0.0.2 > Purpose: { > Generates valid RSS 2.0 feeds for Carl's blogs > } > Comment: { > Massive code changes for instructional purposes. --Gregg > } > ] > > ;; channel data > channel: [ > title "Carl's REBOL Blog - Vive la REBOLution" > link http://www.rebol.net/ > description "describes this blog channel" > language "en" ;"English" > copyright "2005 Carl Sassenrath" > generator "REBOL Messaging Language" > ] > > ;; blog items go here > items: [ > [ > title "Blog item title...." > link http://www.rebol.net/cgi-bin/blog.r?view=0080 > author "Carl Sassenrath" > pubdate 30-Dec-2004/0:0:0 > content {the blog goes here} > ] > [ > title "Blog item title 2...." > link http://www.rebol.net/cgi-bin/blog.r?view=0081 > author "Carl Sassenrath" > pubdate 31-Dec-2004/0:0:0 > content {the blog 2 goes here} > ] > ] > > ;-- No Changes needed below this point ------------------------- > > make-entry: func [series 'key] [ > rejoin [tab to tag! :key series/:key to tag! join #"/" :key] > ] > > channel-entry: func ['key] [make-entry channel :key] > > channel-entries: func [keys [block!] /local result] [ > result: copy "" > foreach key keys [append result join channel-entry :key newline] > result > ] > > output: copy "" > > repend output [ > <?xml version='1.0' encoding='utf-8' ?> <rss version='2.0'> newline > <channel> newline > channel-entries [title link description language copyright generator] > ] > > foreach item items [ > repend output [ > tab <item> newline > tab tab <guid isPermaLink='true'> item/link </guid> newline > tab tab <pubDate> to-idate item/pubdate </pubDate> newline > tab tab <title> item/title </title> newline > tab tab <link> item/link </link> newline > tab tab <description> item/content </description> newline > tab </item> newline > ] > ] > repend output [</channel> newline </rss>] > > ;print output > ;halt > write %carl-rss2.xml output > > -- > To unsubscribe from the list, just send an email to rebol-request > at rebol.com with unsubscribe as the subject. >
-- Premshree Pillai http://www.livejournal.com/~premshree