feat: gen rss on assets.deploy

.gitignore

@@ -45,6 +45,9 @@ hidek_xyz-*.tar
 # Ignore digested assets cache.
 /priv/static/cache_manifest.json
 
+# Ignore generated rss.xml
+/priv/static/rss.xml
+
 # In case you use Node.js/npm, you want to ignore these.
 npm-debug.log
 /assets/node_modules/

lib/hidek_xyz/contents.ex

@@ -12,6 +12,7 @@ defmodule HidekXyz.Contents do
     defexception [:message, plug_status: 404]
   end
 
+  @spec all_articles() :: [%Article{}]
   def all_articles, do: @articles
 
   def get_article_by_slug!(slug) when is_binary(slug) do

lib/hidek_xyz_web.ex

@@ -17,7 +17,7 @@ defmodule HidekXyzWeb do
   those modules here.
   """
 
-  def static_paths, do: ~w(assets fonts images favicon.ico robots.txt)
+  def static_paths, do: ~w(assets fonts images favicon.ico robots.txt rss.xml)
 
   def router do
     quote do

lib/mix/tasks/rss.ex

@@ -0,0 +1,43 @@
+defmodule Mix.Tasks.Rss do
+  use Mix.Task
+
+  @destination "priv/static/rss.xml"
+
+  @impl Mix.Task
+  def run(_args) do
+    items = HidekXyz.Contents.all_articles()
+    |> Enum.map(&link_xml/1)
+    |> Enum.join()
+    |> IO.inspect()
+
+    document = """
+    <?xml version="1.0" encoding="UTF-8" ?>
+    <rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
+      <channel>
+        #{items}
+      </channel>
+    </rss>
+    """
+
+    File.write(@destination, document)
+  end
+
+  defp link_xml(%HidekXyz.Article{} = article) do
+    host = case System.get_env("PHX_HOST") do
+      nil -> "http://localhost:4000"
+      host -> "https://#{host}"
+    end
+
+    link = "#{host}/contents/#{article.slug}"
+
+    """
+    <item>
+      <title>#{article.title}</title>
+      <description>#{article.title}</description>
+      <pubDate>#{Calendar.strftime(article.publish_date, "%a, %d %B %Y 00:00:00 +0000")}</pubDate>
+      <link>#{link}</link>
+      <guid isPermaLink="true">#{link}</guid>
+    </item>
+    """
+  end
+end

mix.exs

@@ -69,7 +69,7 @@ defmodule HidekXyz.MixProject do
       test: ["ecto.create --quiet", "ecto.migrate --quiet", "test"],
       "assets.setup": ["tailwind.install --if-missing", "esbuild.install --if-missing"],
       "assets.build": ["tailwind default", "esbuild default"],
-      "assets.deploy": ["tailwind default --minify", "esbuild default --minify", "phx.digest"]
+      "assets.deploy": ["tailwind default --minify", "esbuild default --minify", "rss", "phx.digest"]
     ]
   end
 end