philomena/lib/philomena_web/markdown_renderer.ex

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defmodule PhilomenaWeb.MarkdownRenderer do
alias Philomena.Markdown
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alias Philomena.Images.Image
alias Philomena.Repo
import Phoenix.HTML
import Phoenix.HTML.Link
import Ecto.Query
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@image_view Module.concat(["PhilomenaWeb.ImageView"])
def render(text, conn) do
images = find_images(text)
representations = render_representations(images, conn)
Markdown.to_html(text, representations)
end
defp find_images(text) do
Regex.scan(~r/>>(\d+)([tsp])?/, text, capture: :all_but_first)
|> Enum.map(fn matches -> [Enum.at(matches, 0) |> String.to_integer(), Enum.at(matches, 1) || ""] end)
|> Enum.filter(fn m -> Enum.at(m, 0) < 2_147_483_647 end)
end
defp load_images(images) do
ids = Enum.map(images, fn m -> Enum.at(m, 0) end)
Image
|> where([i], i.id in ^ids)
|> preload(tags: :aliases)
|> Repo.all()
|> Map.new(&{&1.id, &1})
end
defp link_suffix(image) do
cond do
not is_nil(image.duplicate_id) ->
" (merged)"
image.hidden_from_users ->
" (deleted)"
true ->
""
end
end
defp render_representations(images, conn) do
loaded_images = load_images(images)
images
|> Enum.map(fn group ->
img = loaded_images[Enum.at(group, 0)]
text = "#{Enum.at(group, 0)}#{Enum.at(group, 1)}"
rendered = cond do
img != nil ->
case group do
[_id, "p"] when not img.hidden_from_users ->
Phoenix.View.render(@image_view, "_image_target.html",
image: img,
size: :medium,
conn: conn
)
|> safe_to_string()
[_id, "t"] when not img.hidden_from_users ->
Phoenix.View.render(@image_view, "_image_target.html",
image: img,
size: :small,
conn: conn
)
|> safe_to_string()
[_id, "s"] when not img.hidden_from_users ->
Phoenix.View.render(@image_view, "_image_target.html",
image: img,
size: :thumb_small,
conn: conn
)
|> safe_to_string()
[_id, ""] ->
link(">>#{img.id}#{link_suffix(img)}", to: "/images/#{img.id}")
|> safe_to_string()
[_id, suffix] when suffix in ["t", "s", "p"] ->
link(">>#{img.id}#{suffix}#{link_suffix(img)}", to: "/images/#{img.id}")
|> safe_to_string()
[id, suffix] -> # This condition should never trigger, but let's leave it here just in case.
">>#{id}#{suffix}"
end
true ->
">>#{text}"
end
[text, rendered]
end)
|> Map.new(fn [id, html] -> {id, html} end)
end
end