683 lines
19 KiB
Elixir
683 lines
19 KiB
Elixir
defmodule BDS.Search do
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@moduledoc false
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import Ecto.Query
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import BDS.MapUtils, only: [attr: 2]
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alias BDS.Media.Media
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alias BDS.Media.Translation, as: MediaTranslation
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alias BDS.Persistence
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alias BDS.Posts.Post
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alias BDS.ProgressReporter
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alias BDS.Projects
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alias BDS.Repo
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@stemmer_languages [
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"ar",
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"ca",
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"da",
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"de",
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"el",
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"en",
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"es",
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"eu",
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"fi",
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"fr",
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"ga",
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"hi",
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"hu",
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"hy",
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"it",
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"lt",
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"ne",
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"nl",
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"no",
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"pt",
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"ro",
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"ru",
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"sv",
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"tr"
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]
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@stemmer_algorithms %{
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"da" => :danish,
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"nl" => :dutch,
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"en" => :english,
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"fi" => :finnish,
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"fr" => :french,
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"de" => :german,
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"hu" => :hungarian,
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"it" => :italian,
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"no" => :norwegian,
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"pt" => :portuguese,
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"ro" => :romanian,
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"ru" => :russian,
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"es" => :spanish,
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"sv" => :swedish,
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"tr" => :turkish
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}
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@language_hints [
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{"de", ~w(der die das und ein eine ist sind läuft laufen morgen fluss entlang)},
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{"fr", ~w(je tu il elle nous vous ils elles le la les un une des courir cours matin travail)},
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{"es", ~w(el la los las un una unos unas y que para con pero)},
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{"it", ~w(il lo la gli le un una uno e che per con ogni mattina)}
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]
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@typedoc "Filters and pagination accepted by the search functions."
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@type search_filters :: %{optional(atom()) => term(), optional(String.t()) => term()}
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@typedoc "Reindex/long-running progress options."
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@type reindex_opts :: keyword()
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@spec list_stemmer_languages() :: [String.t()]
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def list_stemmer_languages do
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@stemmer_languages
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end
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@spec detect_language(String.t() | nil) :: String.t()
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def detect_language(text) do
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normalized_text = text |> to_string() |> String.downcase()
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cond do
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normalized_text == "" -> "en"
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String.match?(normalized_text, ~r/[äöüß]/u) -> "de"
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String.match?(normalized_text, ~r/[àâçéèêëîïôùûüÿœ]/u) -> "fr"
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String.match?(normalized_text, ~r/[ñ¡¿]/u) -> "es"
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true -> detect_language_from_hints(normalized_text)
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end
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end
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@spec stem(String.t() | nil, String.t() | nil) :: String.t()
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def stem(text, language \\ nil) do
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language = normalize_language(language || detect_language(text))
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text
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|> tokenize_text()
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|> Enum.map_join(" ", &stem_token(&1, language))
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end
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@spec search_posts(String.t(), String.t() | nil, search_filters()) ::
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{:ok,
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%{
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posts: [Post.t()],
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total: non_neg_integer(),
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offset: non_neg_integer(),
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limit: non_neg_integer()
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}}
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def search_posts(project_id, query, filters \\ %{}) do
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filters = normalize_filters(filters)
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posts =
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project_id
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|> candidate_post_ids(query, filters.language)
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|> load_posts_in_order()
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|> filter_posts(filters)
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{:ok,
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%{
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posts: paginate(posts, filters),
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total: length(posts),
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offset: filters.offset,
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limit: filters.limit
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}}
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end
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@spec search_media(String.t(), String.t() | nil, search_filters()) ::
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{:ok,
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%{
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media: [Media.t()],
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total: non_neg_integer(),
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offset: non_neg_integer(),
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limit: non_neg_integer()
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}}
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def search_media(project_id, query, filters \\ %{}) do
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filters = normalize_filters(filters)
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media_items =
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project_id
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|> candidate_media_ids(query, filters.language)
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|> load_media_in_order()
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{:ok,
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%{
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media: paginate(media_items, filters),
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total: length(media_items),
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offset: filters.offset,
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limit: filters.limit
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}}
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end
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@spec reindex_project(String.t()) :: :ok
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def reindex_project(project_id) do
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:ok = reindex_posts(project_id)
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:ok = reindex_media(project_id)
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:ok
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end
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@spec reindex_posts(String.t(), reindex_opts()) :: :ok
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def reindex_posts(project_id, opts \\ []) do
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Repo.query!(
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"DELETE FROM posts_fts WHERE post_id IN (SELECT id FROM posts WHERE project_id = ?)",
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[project_id]
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)
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posts = Repo.all(from post in Post, where: post.project_id == ^project_id)
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on_progress = progress_callback(opts)
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total_posts = length(posts)
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:ok = report_reindex_started(on_progress, total_posts, "posts")
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posts
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|> Enum.with_index(1)
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|> Enum.each(fn {post, index} ->
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insert_post_index(post)
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:ok = report_reindex_progress(on_progress, index, total_posts, "posts")
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end)
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:ok
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end
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@spec reindex_media(String.t(), reindex_opts()) :: :ok
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def reindex_media(project_id, opts \\ []) do
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Repo.query!(
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"DELETE FROM media_fts WHERE media_id IN (SELECT id FROM media WHERE project_id = ?)",
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[project_id]
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)
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media_items = Repo.all(from media in Media, where: media.project_id == ^project_id)
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on_progress = progress_callback(opts)
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total_media = length(media_items)
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:ok = report_reindex_started(on_progress, total_media, "media items")
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media_items
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|> Enum.with_index(1)
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|> Enum.each(fn {media, index} ->
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insert_media_index(media)
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:ok = report_reindex_progress(on_progress, index, total_media, "media items")
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end)
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:ok
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end
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@spec sync_post(Post.t() | String.t()) :: :ok
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def sync_post(%Post{} = post) do
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delete_post(post.id)
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insert_post_index(post)
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:ok
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end
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def sync_post(post_id) when is_binary(post_id) do
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case Repo.get(Post, post_id) do
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nil -> delete_post(post_id)
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post -> sync_post(post)
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end
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end
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@spec delete_post(Post.t() | String.t()) :: :ok
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def delete_post(%Post{id: post_id}), do: delete_post(post_id)
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def delete_post(post_id) when is_binary(post_id) do
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Repo.query!("DELETE FROM posts_fts WHERE post_id = ?", [post_id])
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:ok
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end
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@spec sync_media(Media.t() | String.t()) :: :ok
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def sync_media(%Media{} = media) do
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delete_media(media.id)
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insert_media_index(media)
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:ok
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end
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def sync_media(media_id) when is_binary(media_id) do
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case Repo.get(Media, media_id) do
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nil -> delete_media(media_id)
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media -> sync_media(media)
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end
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end
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@spec delete_media(Media.t() | String.t()) :: :ok
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def delete_media(%Media{id: media_id}), do: delete_media(media_id)
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def delete_media(media_id) when is_binary(media_id) do
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Repo.query!("DELETE FROM media_fts WHERE media_id = ?", [media_id])
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:ok
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end
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defp progress_callback(opts), do: ProgressReporter.callback(opts)
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defp report_reindex_started(nil, _total, _label), do: :ok
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defp report_reindex_started(callback, 0, label) do
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callback.(1.0, "No #{label} to reindex")
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:ok
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end
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defp report_reindex_started(callback, total, label) do
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callback.(0.0, "Reindexing 0/#{total} #{label}")
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:ok
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end
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defp report_reindex_progress(nil, _current, _total, _label), do: :ok
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defp report_reindex_progress(_callback, _current, 0, _label), do: :ok
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defp report_reindex_progress(callback, current, total, label) do
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callback.(current / total, "Reindexing #{current}/#{total} #{label}")
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:ok
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end
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defp insert_post_index(%Post{} = post) do
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{title, excerpt, content, tags, categories} = post_index_fields(post)
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Repo.query!(
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"INSERT INTO posts_fts (post_id, title, excerpt, content, tags, categories) VALUES (?, ?, ?, ?, ?, ?)",
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[post.id, title, excerpt, content, tags, categories]
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)
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end
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defp insert_media_index(%Media{} = media) do
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{title, alt, caption, original_name, tags} = media_index_fields(media)
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Repo.query!(
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"INSERT INTO media_fts (media_id, title, alt, caption, original_name, tags) VALUES (?, ?, ?, ?, ?, ?)",
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[media.id, title, alt, caption, original_name, tags]
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)
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end
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defp candidate_post_ids(project_id, query, language) do
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if blank_query?(query) do
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Repo.all(from post in Post, where: post.project_id == ^project_id, select: post.id)
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else
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match_query = build_match_query(query, language)
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Repo.query!(
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"""
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SELECT posts_fts.post_id
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FROM posts_fts
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JOIN posts ON posts.id = posts_fts.post_id
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WHERE posts.project_id = ? AND posts_fts MATCH ?
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ORDER BY bm25(posts_fts), posts_fts.rowid
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""",
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[project_id, match_query]
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).rows
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|> Enum.map(fn [post_id] -> post_id end)
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end
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end
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defp candidate_media_ids(project_id, query, language) do
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if blank_query?(query) do
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Repo.all(from media in Media, where: media.project_id == ^project_id, select: media.id)
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else
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match_query = build_match_query(query, language)
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Repo.query!(
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"""
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SELECT media_fts.media_id
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FROM media_fts
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JOIN media ON media.id = media_fts.media_id
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WHERE media.project_id = ? AND media_fts MATCH ?
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ORDER BY bm25(media_fts), media_fts.rowid
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""",
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[project_id, match_query]
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).rows
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|> Enum.map(fn [media_id] -> media_id end)
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end
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end
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defp load_posts_in_order([]), do: []
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defp load_posts_in_order(post_ids) do
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posts_by_id =
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Repo.all(from post in Post, where: post.id in ^post_ids)
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|> Map.new(&{&1.id, &1})
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Enum.map(post_ids, &Map.get(posts_by_id, &1))
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|> Enum.reject(&is_nil/1)
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end
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defp load_media_in_order([]), do: []
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defp load_media_in_order(media_ids) do
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media_by_id =
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Repo.all(from media in Media, where: media.id in ^media_ids)
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|> Map.new(&{&1.id, &1})
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Enum.map(media_ids, &Map.get(media_by_id, &1))
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|> Enum.reject(&is_nil/1)
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end
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defp filter_posts(posts, filters) do
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translation_languages =
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if is_binary(filters.missing_translation_language) do
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post_translation_languages(posts)
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else
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%{}
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end
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Enum.filter(posts, fn post ->
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matches_status?(post, filters.status) and
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matches_overlap?(post.tags, filters.tags) and
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matches_overlap?(post.categories, filters.categories) and
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matches_exact?(post.language, filters.language) and
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matches_year?(post, filters.year) and
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matches_month?(post, filters.month) and
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matches_from?(post, filters.from) and
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matches_to?(post, filters.to) and
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matches_missing_translation?(
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post,
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filters.missing_translation_language,
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translation_languages
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)
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end)
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end
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defp matches_status?(_post, nil), do: true
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defp matches_status?(post, status), do: to_string(post.status) == to_string(status)
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defp matches_overlap?(_values, []), do: true
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defp matches_overlap?(values, required_values) do
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not MapSet.disjoint?(MapSet.new(values || []), MapSet.new(required_values))
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end
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defp matches_exact?(_value, nil), do: true
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defp matches_exact?(value, expected), do: value == expected
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defp matches_year?(_post, nil), do: true
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defp matches_year?(post, year), do: Persistence.from_unix_ms!(post.created_at).year == year
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defp matches_month?(_post, nil), do: true
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defp matches_month?(post, month), do: Persistence.from_unix_ms!(post.created_at).month == month
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defp matches_from?(_post, nil), do: true
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defp matches_from?(post, from_unix), do: post.created_at >= from_unix
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defp matches_to?(_post, nil), do: true
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defp matches_to?(post, to_unix), do: post.created_at <= to_unix
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defp matches_missing_translation?(_post, nil, _translation_languages), do: true
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defp matches_missing_translation?(
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%Post{do_not_translate: true},
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_language,
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_translation_languages
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),
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do: false
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defp matches_missing_translation?(post, language, translation_languages) do
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language not in Map.get(translation_languages, post.id, [])
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end
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defp post_translation_languages([]), do: %{}
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defp post_translation_languages(posts) do
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post_ids = Enum.map(posts, & &1.id)
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placeholders = Enum.map_join(post_ids, ",", fn _ -> "?" end)
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Repo.query!(
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"SELECT translation_for, language FROM post_translations WHERE translation_for IN (#{placeholders})",
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post_ids
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).rows
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|> Enum.group_by(fn [post_id, _language] -> post_id end, fn [_post_id, language] ->
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language
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end)
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end
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defp paginate(items, filters) do
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items
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|> Enum.drop(filters.offset)
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|> Enum.take(filters.limit)
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end
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defp post_index_fields(post) do
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translations = post_translations(post.id)
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post_language = normalize_language(post.language)
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title =
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[
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stem(post.title, post_language)
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| Enum.map(translations, &stem(Map.get(&1, "title"), Map.get(&1, "language")))
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]
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|> join_text()
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excerpt =
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[
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stem(post.excerpt, post_language)
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| Enum.map(translations, &stem(Map.get(&1, "excerpt"), Map.get(&1, "language")))
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]
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|> join_text()
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content =
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[
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stem(post_content(post), post_language)
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| Enum.map(
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translations,
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&stem(translation_content(post.project_id, &1), Map.get(&1, "language"))
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)
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]
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|> join_text()
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tags = stem(Enum.join(post.tags || [], " "), post_language)
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categories = stem(Enum.join(post.categories || [], " "), post_language)
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{title, excerpt, content, tags, categories}
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end
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defp media_index_fields(media) do
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translations =
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Repo.all(
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from translation in MediaTranslation, where: translation.translation_for == ^media.id
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)
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media_language = normalize_language(media.language)
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title =
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[stem(media.title, media_language) | Enum.map(translations, &stem(&1.title, &1.language))]
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|> join_text()
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alt =
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[stem(media.alt, media_language) | Enum.map(translations, &stem(&1.alt, &1.language))]
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|> join_text()
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caption =
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[
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stem(media.caption, media_language)
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| Enum.map(translations, &stem(&1.caption, &1.language))
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]
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|> join_text()
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original_name = stem(media.original_name || "", media_language)
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tags = stem(Enum.join(media.tags || [], " "), media_language)
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{title, alt, caption, original_name, tags}
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end
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defp post_translations(post_id) do
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Repo.query!(
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"SELECT language, title, excerpt, content, status, file_path FROM post_translations WHERE translation_for = ?",
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[post_id]
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).rows
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|> Enum.map(fn [language, title, excerpt, content, status, file_path] ->
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%{
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"language" => language,
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"title" => title,
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"excerpt" => excerpt,
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"content" => content,
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"status" => status,
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"file_path" => file_path
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}
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end)
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end
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defp post_content(%Post{content: content}) when is_binary(content), do: content
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defp post_content(%Post{project_id: project_id, file_path: file_path})
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when is_binary(file_path) and file_path != "" do
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project_id
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|> Projects.get_project!()
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|> Projects.project_data_dir()
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|> Path.join(file_path)
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|
|> markdown_body_from_file()
|
|
end
|
|
|
|
defp post_content(_post), do: ""
|
|
|
|
defp translation_content(_project_id, %{"content" => content}) when is_binary(content),
|
|
do: content
|
|
|
|
defp translation_content(project_id, %{"status" => "published", "file_path" => file_path})
|
|
when is_binary(file_path) and file_path != "" do
|
|
project_id
|
|
|> Projects.get_project!()
|
|
|> Projects.project_data_dir()
|
|
|> Path.join(file_path)
|
|
|> markdown_body_from_file()
|
|
end
|
|
|
|
defp translation_content(_project_id, _translation), do: ""
|
|
|
|
defp markdown_body_from_file(path) do
|
|
case File.read(path) do
|
|
{:ok, contents} ->
|
|
case String.split(contents, "\n---\n", parts: 2) do
|
|
[_frontmatter, body] -> String.trim_trailing(body, "\n")
|
|
_parts -> contents
|
|
end
|
|
|
|
{:error, _reason} ->
|
|
""
|
|
end
|
|
end
|
|
|
|
defp join_text(values) do
|
|
values
|
|
|> Enum.reject(&(&1 in [nil, ""]))
|
|
|> Enum.join("\n")
|
|
end
|
|
|
|
defp build_match_query(query, language) do
|
|
query
|
|
|> query_variants(language)
|
|
|> Enum.map_join(" OR ", fn tokens ->
|
|
tokens
|
|
|> Enum.map_join(" AND ", "ed_term/1)
|
|
|> then(&("(" <> &1 <> ")"))
|
|
end)
|
|
end
|
|
|
|
defp query_variants(query, language) do
|
|
languages = query_languages(query, language)
|
|
tokens = tokenize_text(query)
|
|
|
|
languages
|
|
|> Enum.map(fn stemmer_language -> Enum.map(tokens, &stem_token(&1, stemmer_language)) end)
|
|
|> Enum.reject(&Enum.empty?/1)
|
|
|> Enum.uniq()
|
|
end
|
|
|
|
defp query_languages(query, nil) do
|
|
detected = detect_language(query)
|
|
|
|
([detected] ++ list_stemmer_languages())
|
|
|> Enum.uniq()
|
|
end
|
|
|
|
defp query_languages(_query, language), do: [normalize_language(language)]
|
|
|
|
defp quoted_term(term), do: ~s("#{String.replace(term, ~s("), ~s(\"))}")
|
|
|
|
defp tokenize_text(nil), do: []
|
|
|
|
defp tokenize_text(text) do
|
|
Regex.scan(~r/[[:alnum:]]+/u, to_string(text))
|
|
|> List.flatten()
|
|
|> Enum.map(&String.downcase/1)
|
|
end
|
|
|
|
defp stem_token(token, language) do
|
|
case Map.fetch(@stemmer_algorithms, normalize_language(language)) do
|
|
{:ok, algorithm} -> apply(Stemex, algorithm, [token])
|
|
:error -> token
|
|
end
|
|
rescue
|
|
_error -> token
|
|
end
|
|
|
|
defp normalize_language(nil), do: "en"
|
|
|
|
defp normalize_language(language) do
|
|
language
|
|
|> to_string()
|
|
|> String.downcase()
|
|
|> String.split("-", parts: 2)
|
|
|> hd()
|
|
|> then(fn code -> if code in @stemmer_languages, do: code, else: "en" end)
|
|
end
|
|
|
|
defp detect_language_from_hints(text) do
|
|
tokens = MapSet.new(tokenize_text(text))
|
|
|
|
Enum.find_value(@language_hints, "en", fn {language, hints} ->
|
|
if Enum.any?(hints, &MapSet.member?(tokens, &1)), do: language, else: false
|
|
end)
|
|
end
|
|
|
|
defp normalize_filters(filters) do
|
|
%{
|
|
status: attr(filters, :status),
|
|
tags: normalize_list_filter(attr(filters, :tags)),
|
|
categories: normalize_list_filter(attr(filters, :categories)),
|
|
language: attr(filters, :language),
|
|
missing_translation_language: attr(filters, :missing_translation_language),
|
|
year: normalize_integer(attr(filters, :year)),
|
|
month: normalize_integer(attr(filters, :month)),
|
|
from: normalize_timestamp(attr(filters, :from), :start),
|
|
to: normalize_timestamp(attr(filters, :to), :end),
|
|
offset: normalize_non_negative_integer(attr(filters, :offset), 0),
|
|
limit: normalize_non_negative_integer(attr(filters, :limit), 50)
|
|
}
|
|
end
|
|
|
|
defp normalize_list_filter(nil), do: []
|
|
defp normalize_list_filter(value) when is_list(value), do: Enum.reject(value, &is_nil/1)
|
|
defp normalize_list_filter(value), do: [value]
|
|
|
|
defp normalize_integer(nil), do: nil
|
|
defp normalize_integer(value) when is_integer(value), do: value
|
|
|
|
defp normalize_integer(value) when is_binary(value) do
|
|
case Integer.parse(value) do
|
|
{integer, ""} -> integer
|
|
_ -> nil
|
|
end
|
|
end
|
|
|
|
defp normalize_non_negative_integer(nil, default), do: default
|
|
|
|
defp normalize_non_negative_integer(value, _default) when is_integer(value) and value >= 0,
|
|
do: value
|
|
|
|
defp normalize_non_negative_integer(value, default), do: normalize_integer(value) || default
|
|
|
|
defp normalize_timestamp(nil, _position), do: nil
|
|
|
|
defp normalize_timestamp(value, _position) when is_integer(value),
|
|
do: Persistence.normalize_unix_timestamp(value)
|
|
|
|
defp normalize_timestamp(value, position) when is_binary(value) do
|
|
case Date.from_iso8601(value) do
|
|
{:ok, date} ->
|
|
time = if position == :start, do: ~T[00:00:00], else: ~T[23:59:59]
|
|
{:ok, datetime} = DateTime.new(date, time, "Etc/UTC")
|
|
DateTime.to_unix(datetime, :millisecond)
|
|
|
|
{:error, _reason} ->
|
|
nil
|
|
end
|
|
end
|
|
|
|
defp blank_query?(query), do: query in [nil, ""] or String.trim(to_string(query)) == ""
|
|
end
|