nimforum mirror - Generate XML file with xmltree [nesting format issue]

matthesoundman (orginal) [2020-02-23T21:46:05+01:00] view original

Hello, I am very new to Nim and recently discovered it. I thought it might be cool to generate an XML file for my app cast updater. I seem to misunderstand or there is bug when I am trying to nest with indentation.

Format exmple:


# <xml header>
# <rss>
#   <channel>
#     <title>
#     <description>
#     <item>
#       <title><title/>
#       <sparkle><sparkle/>
#       <pub date><pub date/>
#       <enclosure/>
#     </item>
#  </channel>
# </rss>

Code example:


# item tree ########################################################################################
var t = newElement("title")
t.add newText("Version")

var sr = newElement("sparkle:releaseNotesLink")
sr.add newText("some url to the release notes")

var pd = newElement("pubDate")
pd.add newText("the date")

var enc = newElement("enclosure")
let repo = "https://my-repo/"
let sV = "1.0"
let eAttr = {"url": repo, "sparkle:version": sV}.toXmlAttributes
enc.attrs = eAttr

let itemTree = newXmlTree("item", [t, sr, pd, enc])

# channel tree #####################################################################################
var title = newElement("title")
title.add newText("My App Title")

var description = newElement("description")
description.add newText("For GUI updates")

let channelTree = newXmlTree("channel", [title, description, itemTree])

# rss tree #########################################################################################
let namespace = "http://www.andymatuschak.org/xml-namespaces/sparkle"
let elements = "http://purl.org/dc/elements/1.1/"
let v = "2.0"
let nsAtt = {"xmlns:sparkle": namespace, "xmlns:dc": elements, "version": v}.toXmlAttributes

let rssTree = newXmlTree("rss", [channelTree], nsAtt)

# output to file ###################################################################################
echo rssTree
let f = open("test.xml", fmWrite)
try:
  write(f, xmlHeader & $rssTree)
finally:
  f.close()

Output:


<rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" xmlns:dc="http://purl.org/dc/elements/1.1/"><channel>
    <title>My App Title</title>
    <description>For GUI updates</description>
    <item>
      <title>Version</title>
      <sparkle:releaseNotesLink>some url to the release notes</sparkle:releaseNotesLink>
      <pubDate>the date</pubDate>
      <enclosure sparkle:version="1.0" url="https://my-repo/" />
    </item>
  </channel></rss>

I am expecting the

<channel>

element to be on its own line indented. I am also expecting the end

</rss>

to be on its own line as well.

I am not sure where I am going wrong. If anyone has any tips it would be greatly appreciated. Thank you kindly!

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5972 :: Generate XML file with xmltree [nesting format issue]