68 lines
1.8 KiB
Elixir
68 lines
1.8 KiB
Elixir
defmodule Home73k.Blog do
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@moduledoc """
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Blog content loading & data access functions.
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"""
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import Home73k, only: [app_blog_content: 0]
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alias Home73k.Blog.Post
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Application.ensure_all_started(:earmark)
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post_paths = "#{app_blog_content()}/**/*.md" |> Path.wildcard()
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post_paths_hash = :erlang.md5(post_paths)
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posts =
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for post_path <- post_paths do
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@external_resource Path.relative_to_cwd(post_path)
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Post.parse!(post_path)
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end
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def __mix_recompile__?() do
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Path.wildcard("#{app_blog_content()}/**/*.md")
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|> :erlang.md5() != unquote(post_paths_hash)
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end
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@posts Enum.sort_by(posts, & &1.date, {:desc, NaiveDateTime})
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# Private function to list all posts
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defp list_all_posts, do: @posts
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# List only published (not in future) posts
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def list_posts, do: list_all_posts() |> Enum.reject(&post_in_future?/1)
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# List tags, but only for published (not in future) posts
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def list_tags do
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list_all_posts()
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|> Stream.reject(&post_in_future?/1)
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|> Stream.flat_map(& &1.tags)
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|> Stream.uniq()
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|> Enum.sort()
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end
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# Count of published (not in future) posts
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def post_count, do: list_posts() |> length()
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defmodule NotFoundError do
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defexception [:message, plug_status: 404]
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end
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def get_post_by_id!(id) do
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case Enum.find(list_posts(), nil, &(&1.id == id)) do
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%Post{} = post -> post
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nil -> raise NotFoundError, "post with id=#{id} not found"
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end
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end
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def get_posts_by_tag!(tag) do
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case Enum.filter(list_posts(), &(tag in &1.tags)) do
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[] -> raise NotFoundError, "posts with tag=#{tag} not found"
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posts -> posts
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end
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end
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# check if post date is in future
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defp post_in_future?(post) do
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NaiveDateTime.compare(post.date, NaiveDateTime.utc_now()) == :gt
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end
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end
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