_common.qmd

```{julia}
#| include: false
using Pkg
Pkg.activate(@__DIR__)
Pkg.instantiate()
```

```{julia}
#| include: false
using Pandoc
using FilePaths
using JSON3
using Dates
using TimeZones

function xml(posts)
  posts = map(posts) do post
    """
      <item>
        <title>$(post[:title])</title>
        <link>https://kdheepak.com/blog/$(post[:slug])</link>
        <guid isPermaLink="true">https://kdheepak.com/blog/$(post[:slug])</guid>
        <atom:link href="https://kdheepak.com/blog/$(post[:slug])" rel="self"></atom:link>
        <pubDate>$(Dates.format(DateTime(ZonedDateTime(post[:date], DateFormat("yyyy-mm-ddTHH:MM:SSz")), UTC), "e, d u yyyy HH:MM:SS")) GMT</pubDate>
        <description>$(post[:summary])</description>
      </item>
    """
  end

  posts = join(posts, "\n")

  date = Dates.now()

  return """<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" media="screen" href="/rss.xsl"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
  <channel>
    <title>Dheepak Krishnamurthy's Blog</title>
    <description>My thoughts, notes and blogs</description>
    <link>https://kdheepak.com/blog/</link>
    <language>en-us</language>
    <copyright>Copyright 2020, Dheepak Krishnamurthy</copyright>
    <atom:link href="https://kdheepak.com/blog/rss.xml" rel="self" type="application/rss+xml"/>
    <generator>quarto</generator>
    $(posts)
  </channel>
</rss>"""
end

function rss(category)
  rm("./_site/tags/$category/", force=true, recursive=true)
  posts = []
  for folder in filter(folder -> isdir(folder) && !startswith(folder, "_") && !startswith(folder, "."), readdir("."))
    filename = joinpath(folder, "index.qmd")
    if isfile(filename)
      d = Pandoc.metadata(FilePaths.Path(filename))
      categories = :categories ∈ keys(d) ? d[:categories] : []
      if category ∈ lowercase.(categories)
        d[:slug] = folder
        push!(posts, d)
      end
    end
  end
  posts = sort(posts, by=x -> ZonedDateTime(x[:date], DateFormat("yyyy-mm-ddTHH:MM:SSz")), rev=true)
  mkpath("./_site/tags/$category/")
  data = xml(posts)
  open("./_site/tags/$category/rss.xml", "w") do f
    write(f, data)
  end
end
```