Re-enable Credo ModuleDoc check

Closes #108

.credo.exs

@@ -4,11 +4,34 @@
       name: "default",
       checks: %{
         extra: [
-          {Credo.Check.Refactor.Nesting, max_nesting: 3}
+          {Credo.Check.Refactor.Nesting, max_nesting: 3},
+          {Credo.Check.Readability.ModuleDoc,
+           ignore_names: [
+             # Credo defaults
+             ~r/(\.\w+Controller|\.Endpoint|\.\w+Live(\.\w+)?|\.Repo|\.Router|\.\w+Socket|\.\w+View|\.\w+HTML|\.\w+JSON|\.Telemetry|\.Layouts|\.Mailer)$/,
+             # Custom: external API internals follow a three-module pattern
+             # where only the facade needs documentation
+             ~r/\.API(\..*)?$/,
+             ~r/\.Config$/,
+             # Custom: test support modules
+             ~r/Fixtures/,
+             # Custom: mix tasks
+             ~r/^Mix\.Tasks\./
+           ],
+           ignore_modules_using: [
+             # Credo defaults
+             Credo.Check,
+             Ecto.Schema,
+             Phoenix.LiveView,
+             ~r/\.Web$/,
+             # Custom: LiveComponents and Oban workers are self-documenting
+             Oban.Worker,
+             # Matches `use MusicLibraryWeb, :live_component` etc.
+             MusicLibraryWeb
+           ]},
+          {Credo.Check.Refactor.CyclomaticComplexity, max_complexity: 12}
         ],
-        disabled: [
+        disabled: []
-          {Credo.Check.Readability.ModuleDoc, []}
-        ]
       }
       # files etc.
     }

lib/brave_search.ex

@@ -1,4 +1,8 @@
 defmodule BraveSearch do
+  @moduledoc """
+  Brave Search API facade for cover art and artist image search.
+  """
+
   alias BraveSearch.API
 
   @spec search_images(String.t(), keyword()) :: {:ok, [map()]} | {:error, term()}

lib/discogs.ex

@@ -1,4 +1,8 @@
 defmodule Discogs do
+  @moduledoc """
+  Discogs API facade for artist profiles and images.
+  """
+
   alias Discogs.API
 
   @spec get_artist(integer() | String.t()) :: {:ok, map()} | {:error, term()}

lib/last_fm.ex

@@ -1,4 +1,8 @@
 defmodule LastFm do
+  @moduledoc """
+  Last.fm API facade for scrobbling and listening history.
+  """
+
   alias LastFm.{API, Feed, Refresh, Scrobble, Track, Worker}
   alias MusicLibrary.{BackgroundRepo, Repo}
 

lib/last_fm/import.ex

@@ -1,4 +1,6 @@
 defmodule LastFm.Import do
+  @moduledoc false
+
   @spec batch(keyword()) :: {:ok, non_neg_integer()} | {:error, term()}
   def batch(opts) do
     with {:ok, tracks} <- LastFm.get_tracks(opts) do

lib/last_fm/scrobble.ex

@@ -1,4 +1,6 @@
 defmodule LastFm.Scrobble do
+  @moduledoc false
+
   defstruct [:track, :artist, :timestamp, :album, :album_artist, :mbid]
 
   @type t :: %__MODULE__{

lib/last_fm/session.ex

@@ -1,4 +1,6 @@
 defmodule LastFm.Session do
+  @moduledoc false
+
   require Record
 
   defstruct [:name, :key, :pro]

lib/last_fm/supervisor.ex

@@ -1,4 +1,6 @@
 defmodule LastFm.Supervisor do
+  @moduledoc false
+
   use Supervisor
 
   def start_link(config) do

lib/music_brainz.ex

@@ -1,4 +1,8 @@
 defmodule MusicBrainz do
+  @moduledoc """
+  MusicBrainz API facade for release and artist metadata search.
+  """
+
   alias MusicBrainz.API
 
   @type search_opts :: [limit: non_neg_integer(), offset: non_neg_integer()]

lib/music_brainz/artist.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.Artist do
+  @moduledoc false
+
   @enforce_keys [:id, :name, :sort_name]
   defstruct [:id, :name, :sort_name, :country, :relations, :musicbrainz_data]
 

lib/music_brainz/external_link.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ExternalLink do
+  @moduledoc false
+
   defstruct [:name, :url]
 
   @type t :: %__MODULE__{

lib/music_brainz/release.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.Release do
+  @moduledoc false
+
   @enforce_keys [
     :id,
     :title,
@@ -38,6 +40,8 @@ defmodule MusicBrainz.Release do
         }
 
   defmodule Artist do
+    @moduledoc false
+
     @enforce_keys [:id, :name, :sort_name]
     defstruct [:id, :name, :sort_name]
 
@@ -49,6 +53,8 @@ defmodule MusicBrainz.Release do
   end
 
   defmodule Medium do
+    @moduledoc false
+
     @enforce_keys [:title, :format, :number, :track_count, :tracks]
     defstruct [:title, :format, :number, :track_count, :tracks]
 
@@ -62,6 +68,8 @@ defmodule MusicBrainz.Release do
   end
 
   defmodule Track do
+    @moduledoc false
+
     @enforce_keys [:id, :title, :artists, :length, :number, :position]
     defstruct [:id, :title, :artists, :length, :number, :position]
 

lib/music_brainz/release_group.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ReleaseGroup do
+  @moduledoc false
+
   alias MusicBrainz.ReleaseGroupSearchResult
 
   @spec included_release_groups(map()) :: [ReleaseGroupSearchResult.t()]

lib/music_brainz/release_group_search_result.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ReleaseGroupSearchResult do
+  @moduledoc false
+
   alias MusicBrainz.ReleaseGroup
 
   @enforce_keys [:id, :type, :title, :artists, :release_date]

lib/music_brainz/release_search_result.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ReleaseSearchResult do
+  @moduledoc false
+
   alias MusicBrainz.ReleaseGroup
 
   @enforce_keys [:id, :title, :release_group, :artists, :date, :barcode, :media]

lib/music_library/artist_chat.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.ArtistChat do
+  @moduledoc """
+  Chat implementation for artists using OpenAI streaming with Wikipedia context.
+  """
+
   @behaviour MusicLibrary.Chat
 
   alias MusicLibrary.Artists.ArtistInfo

lib/music_library/artists.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Artists do
+  @moduledoc """
+  Artist metadata management from MusicBrainz, Discogs, Wikipedia, and Last.fm.
+  """
+
   import Ecto.Query, warn: false
 
   alias MusicLibrary.Artists.ArtistInfo

lib/music_library/artists/batch.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Artists.Batch do
+  @moduledoc """
+  Batch operations for artists: refresh MusicBrainz, Discogs, Wikipedia, and Last.fm data.
+  """
+
   import Ecto.Query
 
   alias MusicLibrary.Artists

lib/music_library/assets.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Assets do
+  @moduledoc """
+  Binary asset storage and retrieval for covers and artist images.
+  """
+
   alias MusicLibrary.Assets.{Asset, Cache}
   alias MusicLibrary.Repo
 

lib/music_library/assets/cache.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Assets.Cache do
+  @moduledoc """
+  ETS-based asset cache with TTL for serving frequently accessed images.
+  """
+
   @spec new() :: :ets.table()
   def new do
     :ets.new(__MODULE__, [:named_table, :public, :compressed, read_concurrency: true])

lib/music_library/assets/image.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Assets.Image do
+  @moduledoc """
+  Image processing via Vix (libvips) for covers and artist images.
+  """
+
   alias Vix.Vips.{Image, Operation}
 
   fallback_path = Application.app_dir(:music_library, ["priv", "image-not-found.jpg"])

lib/music_library/assets/transform.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Assets.Transform do
+  @moduledoc """
+  Represents an image transformation (hash + target width) for asset serving.
+  """
+
   @derive JSON.Encoder
   defstruct [:hash, :width]
 

lib/music_library/background_repo.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibrary.BackgroundRepo do
+  @moduledoc false
+
   use Ecto.Repo,
     otp_app: :music_library,
     adapter: Ecto.Adapters.SQLite3

lib/music_library/barcode_scan.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.BarcodeScan do
+  @moduledoc """
+  Barcode-to-MusicBrainz lookup workflow.
+  """
+
   alias MusicLibrary.BarcodeScan.Result
   alias MusicLibrary.Records
 

lib/music_library/barcode_scan/result.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibrary.BarcodeScan.Result do
+  @moduledoc false
+
   defstruct [:status, :number, :record_id, :release]
 
   @type t :: %__MODULE__{

lib/music_library/batch.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Batch do
+  @moduledoc """
+  Generic batch runner: streams records through a transaction with error accumulation.
+  """
+
   alias MusicLibrary.Repo
 
   require Logger

lib/music_library/chat.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Chat do
+  @moduledoc """
+  Behaviour for streaming AI chat with entity-specific context.
+  """
+
   @callback stream_response(
               messages :: list(map()),
               context :: term(),

lib/music_library/collection.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Collection do
+  @moduledoc """
+  Queries for collected records (where `purchased_at` is set).
+  """
+
   import Ecto.Query, warn: false
   import MusicLibrary.Records, only: [order_alphabetically: 0]
 

lib/music_library/encrypted/binary.ex

@@ -1,3 +1,4 @@
 defmodule MusicLibrary.Encrypted.Binary do
+  @moduledoc false
   use Cloak.Ecto.Binary, vault: MusicLibrary.Vault
 end

lib/music_library/notes.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Notes do
+  @moduledoc """
+  Free-text notes attached to records and artists.
+  """
+
   alias MusicLibrary.Notes.Note
   alias MusicLibrary.Repo
 

lib/music_library/record_chat.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.RecordChat do
+  @moduledoc """
+  Chat implementation for records using OpenAI streaming with web search.
+  """
+
   @behaviour MusicLibrary.Chat
 
   alias MusicLibrary.Records.Record

lib/music_library/record_sets.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.RecordSets do
+  @moduledoc """
+  User-curated record groupings with ordered items.
+  """
+
   import Ecto.Query, warn: false
 
   alias MusicLibrary.RecordSets.{RecordSet, RecordSetItem}

lib/music_library/records/batch.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Records.Batch do
+  @moduledoc """
+  Batch operations for records: refresh MusicBrainz data and generate embeddings.
+  """
+
   import Ecto.Query
 
   alias MusicLibrary.Batch

lib/music_library/records/tracklist_pdf.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Records.TracklistPdf do
+  @moduledoc """
+  Generates 120mm x 120mm PDF tracklists from record and release data via Typst.
+  """
+
   alias MusicBrainz.Release
   alias MusicLibraryWeb.Duration
   alias Typst.Format

lib/music_library/scrobble_activity.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.ScrobbleActivity do
+  @moduledoc """
+  Scrobbling releases, media, and tracks to Last.fm.
+  """
+
   alias LastFm.Scrobble
   alias MusicBrainz.Release
   alias MusicLibrary.Secrets

lib/music_library/secrets.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Secrets do
+  @moduledoc """
+  Encrypted key-value storage for API keys and credentials.
+  """
+
   alias MusicLibrary.Repo
   alias MusicLibrary.Secrets.Secret
 

lib/music_library/telemetry_repo.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibrary.TelemetryRepo do
+  @moduledoc false
+
   use Ecto.Repo,
     otp_app: :music_library,
     adapter: Ecto.Adapters.SQLite3

lib/music_library/vault.ex

@@ -1,3 +1,4 @@
 defmodule MusicLibrary.Vault do
+  @moduledoc false
   use Cloak.Vault, otp_app: :music_library
 end

lib/music_library/wishlist.ex

@@ -1,4 +1,8 @@
 defmodule MusicLibrary.Wishlist do
+  @moduledoc """
+  Queries for wishlisted records (where `purchased_at` is nil).
+  """
+
   import Ecto.Query, warn: false
 
   alias MusicLibrary.Records

lib/music_library_web/auth.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibraryWeb.Auth do
+  @moduledoc false
+
   use Gettext, backend: MusicLibraryWeb.Gettext
 
   import LiveToast, only: [put_toast: 3]

lib/music_library_web/hooks/show_toast.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibraryWeb.Hooks.ShowToast do
+  @moduledoc false
+
   import Phoenix.LiveView
   import LiveToast, only: [put_toast: 3]
 

lib/music_library_web/live_helpers/params.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibraryWeb.LiveHelpers.Params do
+  @moduledoc false
+
   @pagination Application.compile_env!(:music_library, :pagination)
 
   @spec parse_page(String.t() | nil | term()) :: pos_integer()

lib/music_library_web/telemetry/storage.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibraryWeb.Telemetry.Storage do
+  @moduledoc false
+
   use GenServer
 
   @buffer_size Application.compile_env(

lib/open_ai.ex

@@ -1,4 +1,8 @@
 defmodule OpenAI do
+  @moduledoc """
+  OpenAI API facade for text embeddings and streaming chat.
+  """
+
   alias OpenAI.API
 
   @type chat_stream_opts :: [

lib/open_ai/completion.ex

@@ -1,4 +1,6 @@
 defmodule OpenAI.Completion do
+  @moduledoc false
+
   @enforce_keys [:content]
   defstruct content: "",
             temperature: 0.2,

lib/wikipedia.ex

@@ -1,4 +1,8 @@
 defmodule Wikipedia do
+  @moduledoc """
+  Wikipedia API facade for artist biographies.
+  """
+
   alias Wikipedia.API
 
   @spec get_artist_summary(String.t()) :: {:ok, map()} | {:error, :no_english_wikipedia | term()}

test/support/color_helpers.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibrary.ColorHelpers do
+  @moduledoc false
+
   @doc """
   Returns true if the given string is a valid lowercase hex color code.
 

test/support/live_test_helpers.ex

@@ -1,4 +1,6 @@
 defmodule MusicLibraryWeb.LiveTestHelpers do
+  @moduledoc false
+
   def escape(string) do
     LazyHTML.html_escape(string)
   end