Refactor code to comply with credo suggestions

.credo.exs

@@ -0,0 +1,138 @@
+# This file contains the configuration for Credo and you are probably reading
+# this after creating it with `mix credo.gen.config`.
+#
+# If you find anything wrong or unclear in this file, please report an
+# issue on GitHub: https://github.com/rrrene/credo/issues
+#
+%{
+  #
+  # You can have as many configs as you like in the `configs:` field.
+  configs: [
+    %{
+      #
+      # Run any config using `mix credo -C <name>`. If no config name is given
+      # "default" is used.
+      name: "default",
+      #
+      # These are the files included in the analysis:
+      files: %{
+        #
+        # You can give explicit globs or simply directories.
+        # In the latter case `**/*.{ex,exs}` will be used.
+        included: ["lib/", "src/", "web/", "apps/"],
+        excluded: [~r"/_build/", ~r"/deps/"]
+      },
+      #
+      # If you create your own checks, you must specify the source files for
+      # them here, so they can be loaded by Credo before running the analysis.
+      requires: [],
+      #
+      # Credo automatically checks for updates, like e.g. Hex does.
+      # You can disable this behaviour below:
+      check_for_updates: true,
+      #
+      # If you want to enforce a style guide and need a more traditional linting
+      # experience, you can change `strict` to `true` below:
+      strict: false,
+      #
+      # If you want to use uncolored output by default, you can change `color`
+      # to `false` below:
+      color: true,
+      #
+      # You can customize the parameters of any check by adding a second element
+      # to the tuple.
+      #
+      # To disable a check put `false` as second element:
+      #
+      #     {Credo.Check.Design.DuplicatedCode, false}
+      #
+      checks: [
+        {Credo.Check.Consistency.ExceptionNames},
+        {Credo.Check.Consistency.LineEndings},
+        {Credo.Check.Consistency.MultiAliasImportRequireUse},
+        {Credo.Check.Consistency.ParameterPatternMatching},
+        {Credo.Check.Consistency.SpaceAroundOperators},
+        {Credo.Check.Consistency.SpaceInParentheses},
+        {Credo.Check.Consistency.TabsOrSpaces},
+
+        # For some checks, like AliasUsage, you can only customize the priority
+        # Priority values are: `low, normal, high, higher`
+        {Credo.Check.Design.AliasUsage, priority: :low},
+
+        # For others you can set parameters
+
+        # If you don't want the `setup` and `test` macro calls in ExUnit tests
+        # or the `schema` macro in Ecto schemas to trigger DuplicatedCode, just
+        # set the `excluded_macros` parameter to `[:schema, :setup, :test]`.
+        {Credo.Check.Design.DuplicatedCode, excluded_macros: []},
+
+        # You can also customize the exit_status of each check.
+        # If you don't want TODO comments to cause `mix credo` to fail, just
+        # set this value to 0 (zero).
+        {Credo.Check.Design.TagTODO, exit_status: 2},
+        {Credo.Check.Design.TagFIXME},
+
+        {Credo.Check.Readability.FunctionNames},
+        {Credo.Check.Readability.LargeNumbers},
+        {Credo.Check.Readability.MaxLineLength, priority: :low, max_length: 100},
+        {Credo.Check.Readability.ModuleAttributeNames},
+        {Credo.Check.Readability.ModuleDoc, false},
+        {Credo.Check.Readability.ModuleNames},
+        {Credo.Check.Readability.ParenthesesOnZeroArityDefs},
+        {Credo.Check.Readability.ParenthesesInCondition},
+        {Credo.Check.Readability.PredicateFunctionNames},
+        {Credo.Check.Readability.PreferImplicitTry},
+        {Credo.Check.Readability.RedundantBlankLines},
+        {Credo.Check.Readability.StringSigils},
+        {Credo.Check.Readability.TrailingBlankLine},
+        {Credo.Check.Readability.TrailingWhiteSpace},
+        {Credo.Check.Readability.VariableNames},
+        {Credo.Check.Readability.Semicolons},
+        {Credo.Check.Readability.SpaceAfterCommas},
+
+        {Credo.Check.Refactor.DoubleBooleanNegation},
+        {Credo.Check.Refactor.CondStatements},
+        {Credo.Check.Refactor.CyclomaticComplexity},
+        {Credo.Check.Refactor.FunctionArity},
+        {Credo.Check.Refactor.MatchInCondition},
+        {Credo.Check.Refactor.NegatedConditionsInUnless},
+        {Credo.Check.Refactor.NegatedConditionsWithElse},
+        {Credo.Check.Refactor.Nesting},
+        {Credo.Check.Refactor.PipeChainStart},
+        {Credo.Check.Refactor.UnlessWithElse},
+
+        {Credo.Check.Warning.BoolOperationOnSameValues},
+        {Credo.Check.Warning.IExPry},
+        {Credo.Check.Warning.IoInspect},
+        {Credo.Check.Warning.LazyLogging},
+        {Credo.Check.Warning.OperationOnSameValues},
+        {Credo.Check.Warning.OperationWithConstantResult},
+        {Credo.Check.Warning.UnusedEnumOperation},
+        {Credo.Check.Warning.UnusedFileOperation},
+        {Credo.Check.Warning.UnusedKeywordOperation},
+        {Credo.Check.Warning.UnusedListOperation},
+        {Credo.Check.Warning.UnusedPathOperation},
+        {Credo.Check.Warning.UnusedRegexOperation},
+        {Credo.Check.Warning.UnusedStringOperation},
+        {Credo.Check.Warning.UnusedTupleOperation},
+
+        # Controversial and experimental checks (opt-in, just remove `, false`)
+        #
+        {Credo.Check.Refactor.ABCSize, false},
+        {Credo.Check.Refactor.AppendSingleItem, false},
+        {Credo.Check.Refactor.VariableRebinding, false},
+        {Credo.Check.Warning.MapGetUnsafePass, false},
+
+        # Deprecated checks (these will be deleted after a grace period)
+        {Credo.Check.Readability.Specs, false},
+        {Credo.Check.Warning.NameRedeclarationByAssignment, false},
+        {Credo.Check.Warning.NameRedeclarationByCase, false},
+        {Credo.Check.Warning.NameRedeclarationByDef, false},
+        {Credo.Check.Warning.NameRedeclarationByFn, false},
+
+        # Custom checks can be created using `mix credo.gen.check`.
+        #
+      ]
+    }
+  ]
+}

lib/pleroma/plugs/authentication_plug.ex

@@ -1,4 +1,5 @@
 defmodule Pleroma.Plugs.AuthenticationPlug do
+  alias Comeonin.Pbkdf2
   import Plug.Conn
 
   def init(options) do
@@ -25,12 +26,12 @@ defp verify(%{id: id} = user, _password, id) do
   end
 
   defp verify(nil, _password, _user_id) do
-    Comeonin.Pbkdf2.dummy_checkpw
+    Pbkdf2.dummy_checkpw
     :error
   end
 
   defp verify(user, password, _user_id) do
-    if Comeonin.Pbkdf2.checkpw(password, user.password_hash) do
+    if Pbkdf2.checkpw(password, user.password_hash) do
       {:ok, user}
     else
       :error

lib/pleroma/upload.ex

@@ -1,6 +1,8 @@
 defmodule Pleroma.Upload do
+  alias Ecto.UUID
+  alias Pleroma.Web
   def store(%Plug.Upload{} = file) do
-    uuid = Ecto.UUID.generate
+    uuid = UUID.generate
     upload_folder = Path.join(upload_path(), uuid)
     File.mkdir_p!(upload_folder)
     result_file = Path.join(upload_folder, file.filename)
@@ -21,7 +23,7 @@ def store(%Plug.Upload{} = file) do
   def store(%{"img" => "data:image/" <> image_data}) do
     parsed = Regex.named_captures(~r/(?<filetype>jpeg|png|gif);base64,(?<data>.*)/, image_data)
     data = Base.decode64!(parsed["data"])
-    uuid = Ecto.UUID.generate
+    uuid = UUID.generate
     upload_folder = Path.join(upload_path(), uuid)
     File.mkdir_p!(upload_folder)
     filename = Base.encode16(:crypto.hash(:sha256, data)) <> ".#{parsed["filetype"]}"
@@ -44,11 +46,11 @@ def store(%{"img" => "data:image/" <> image_data}) do
   end
 
   defp upload_path do
-    Application.get_env(:pleroma, Pleroma.Upload)
+    settings = Application.get_env(:pleroma, Pleroma.Upload)
-    |> Keyword.fetch!(:uploads)
+    Keyword.fetch!(settings, :uploads)
   end
 
   defp url_for(file) do
-    "#{Pleroma.Web.base_url()}/media/#{file}"
+    "#{Web.base_url()}/media/#{file}"
   end
 end

lib/pleroma/user.ex

@@ -1,8 +1,8 @@
 defmodule Pleroma.User do
   use Ecto.Schema
-  import Ecto.Changeset
+  import Ecto.{Changeset, Query}
-  import Ecto.Query
+  alias Pleroma.{Repo, User, Object, Web}
-  alias Pleroma.{Repo, User, Activity, Object}
+  alias Comeonin.Pbkdf2
 
   schema "users" do
     field :bio, :string
@@ -27,7 +27,7 @@ def avatar_url(user) do
   end
 
   def ap_id(%User{nickname: nickname}) do
-    "#{Pleroma.Web.base_url}/users/#{nickname}"
+    "#{Web.base_url}/users/#{nickname}"
   end
 
   def ap_followers(%User{} = user) do
@@ -66,7 +66,7 @@ def register_changeset(struct, params \\ %{}) do
     |> validate_format(:nickname, ~r/^[a-zA-Z\d]+$/)
 
     if changeset.valid? do
-      hashed = Comeonin.Pbkdf2.hashpwsalt(changeset.changes[:password])
+      hashed = Pbkdf2.hashpwsalt(changeset.changes[:password])
       ap_id = User.ap_id(%User{nickname: changeset.changes[:nickname]})
       followers = User.ap_followers(%User{nickname: changeset.changes[:nickname]})
       changeset

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1,6 +1,6 @@
 defmodule Pleroma.Web.ActivityPub.ActivityPub do
-  alias Pleroma.Repo
+  alias Pleroma.{Activity, Repo, Object, Upload, User, Web}
-  alias Pleroma.{Activity, Object, Upload, User}
+  alias Ecto.{Changeset, UUID}
   import Ecto.Query
 
   def insert(map) when is_map(map) do
@@ -44,7 +44,7 @@ def like(%User{ap_id: ap_id} = user, %Object{data: %{ "id" => id}} = object) do
         |> Map.put("like_count", length(likes))
         |> Map.put("likes", likes)
 
-        changeset = Ecto.Changeset.change(object, data: new_data)
+        changeset = Changeset.change(object, data: new_data)
         {:ok, object} = Repo.update(changeset)
 
         update_object_in_activities(object)
@@ -58,7 +58,7 @@ defp update_object_in_activities(%{data: %{"id" => id}} = object) do
     relevant_activities = Activity.all_by_object_ap_id(id)
     Enum.map(relevant_activities, fn (activity) ->
       new_activity_data = activity.data |> Map.put("object", object.data)
-      changeset = Ecto.Changeset.change(activity, data: new_activity_data)
+      changeset = Changeset.change(activity, data: new_activity_data)
       Repo.update(changeset)
     end)
   end
@@ -79,7 +79,7 @@ def unlike(%User{ap_id: ap_id}, %Object{data: %{ "id" => id}} = object) do
       |> Map.put("like_count", length(likes))
       |> Map.put("likes", likes)
 
-      changeset = Ecto.Changeset.change(object, data: new_data)
+      changeset = Changeset.change(object, data: new_data)
       {:ok, object} = Repo.update(changeset)
 
       update_object_in_activities(object)
@@ -103,7 +103,7 @@ def generate_object_id do
   end
 
   def generate_id(type) do
-    "#{Pleroma.Web.base_url()}/#{type}/#{Ecto.UUID.generate}"
+    "#{Web.base_url()}/#{type}/#{UUID.generate}"
   end
 
   def fetch_public_activities(opts \\ %{}) do
@@ -140,8 +140,7 @@ def fetch_activities(recipients, opts \\ %{}) do
       query
     end
 
-    Repo.all(query)
+    Enum.reverse(Repo.all(query))
-    |> Enum.reverse
   end
 
   def announce(%User{ap_id: ap_id} = user, %Object{data: %{"id" => id}} = object) do
@@ -160,7 +159,7 @@ def announce(%User{ap_id: ap_id} = user, %Object{data: %{"id" => id}} = object)
     |> Map.put("announcement_count", length(announcements))
     |> Map.put("announcements", announcements)
 
-    changeset = Ecto.Changeset.change(object, data: new_data)
+    changeset = Changeset.change(object, data: new_data)
     {:ok, object} = Repo.update(changeset)
 
     update_object_in_activities(object)

lib/pleroma/web/ostatus/feed_representer.ex

@@ -8,7 +8,8 @@ def to_simple_form(user, activities, users) do
 
     h = fn(str) -> [to_charlist(str)] end
 
-    entries = Enum.map(activities, fn(activity) ->
+    entries = activities
+    |> Enum.map(fn(activity) ->
       {:entry, ActivityRepresenter.to_simple_form(activity, user)}
     end)
     |> Enum.filter(fn ({_, form}) -> form end)

lib/pleroma/web/ostatus/ostatus_controller.ex

@@ -16,7 +16,8 @@ def feed(conn, %{"nickname" => nickname}) do
     activities = query
     |> Repo.all
 
-    response = FeedRepresenter.to_simple_form(user, activities, [user])
+    response = user
+    |> FeedRepresenter.to_simple_form(activities, [user])
     |> :xmerl.export_simple(:xmerl_xml)
     |> to_string
 
@@ -25,7 +26,7 @@ def feed(conn, %{"nickname" => nickname}) do
     |> send_resp(200, response)
   end
 
-  def temp(conn, params) do
+  def temp(_conn, params) do
     IO.inspect(params)
   end
 end

lib/pleroma/web/router.ex

@@ -1,7 +1,7 @@
 defmodule Pleroma.Web.Router do
   use Pleroma.Web, :router
 
-  alias Pleroma.{Repo, User}
+  alias Pleroma.{Repo, User, Web.Router}
 
   def user_fetcher(username) do
     {:ok, Repo.get_by(User, %{nickname: username})}
@@ -10,13 +10,13 @@ def user_fetcher(username) do
   pipeline :api do
     plug :accepts, ["json"]
     plug :fetch_session
-    plug Pleroma.Plugs.AuthenticationPlug, %{fetcher: &Pleroma.Web.Router.user_fetcher/1, optional: true}
+    plug Pleroma.Plugs.AuthenticationPlug, %{fetcher: &Router.user_fetcher/1, optional: true}
   end
 
   pipeline :authenticated_api do
     plug :accepts, ["json"]
     plug :fetch_session
-    plug Pleroma.Plugs.AuthenticationPlug, %{fetcher: &Pleroma.Web.Router.user_fetcher/1}
+    plug Pleroma.Plugs.AuthenticationPlug, %{fetcher: &Router.user_fetcher/1}
   end
 
   pipeline :well_known do

lib/pleroma/web/salmon/salmon.ex

@@ -10,7 +10,6 @@ def decode(salmon) do
     {:xmlObj, :string, encoding} = :xmerl_xpath.string('string(//me:encoding[1])', doc)
     {:xmlObj, :string, type} = :xmerl_xpath.string('string(//me:data[1]/@type)', doc)
 
-
     {:ok, data} = Base.url_decode64(to_string(data), ignore: :whitespace)
     {:ok, sig} = Base.url_decode64(to_string(sig), ignore: :whitespace)
     alg = to_string(alg)

lib/pleroma/web/twitter_api/representers/activity_representer.ex

@@ -1,17 +1,17 @@
 defmodule Pleroma.Web.TwitterAPI.Representers.ActivityRepresenter do
   use Pleroma.Web.TwitterAPI.Representers.BaseRepresenter
   alias Pleroma.Web.TwitterAPI.Representers.{UserRepresenter, ObjectRepresenter}
-  alias Pleroma.Activity
+  alias Pleroma.{Activity, User}
-
+  alias Calendar.Strftime
 
   defp user_by_ap_id(user_list, ap_id) do
     Enum.find(user_list, fn (%{ap_id: user_id}) -> ap_id == user_id end)
   end
 
-  def to_map(%Activity{data: %{"type" => "Announce", "actor" => actor}} = activity, %{users: users, announced_activity: announced_activity} = opts) do
+  def to_map(%Activity{data: %{"type" => "Announce", "actor" => actor, "published" => created_at}} = activity,
+             %{users: users, announced_activity: announced_activity} = opts) do
     user = user_by_ap_id(users, actor)
-    created_at = get_in(activity.data, ["published"])
+    created_at = created_at |> date_to_asctime
-    |> date_to_asctime
 
     text = "#{user.nickname} retweeted a status."
 
@@ -30,16 +30,16 @@ def to_map(%Activity{data: %{"type" => "Announce", "actor" => actor}} = activity
     }
   end
 
-  def to_map(%Activity{data: %{"type" => "Like"}} = activity, %{user: user, liked_activity: liked_activity} = opts) do
+  def to_map(%Activity{data: %{"type" => "Like", "published" => created_at}} = activity,
-    created_at = get_in(activity.data, ["published"])
+             %{user: user, liked_activity: liked_activity} = opts) do
-    |> date_to_asctime
+    created_at = created_at |> date_to_asctime
 
     text = "#{user.nickname} favorited a status."
 
     %{
       "id" => activity.id,
       "user" => UserRepresenter.to_map(user, opts),
-      "statusnet_html" => text,  # TODO: add summary
+      "statusnet_html" => text,
       "text" => text,
       "is_local" => true,
       "is_post_verb" => false,
@@ -49,16 +49,17 @@ def to_map(%Activity{data: %{"type" => "Like"}} = activity, %{user: user, liked_
     }
   end
 
-  def to_map(%Activity{data: %{"type" => "Follow"}} = activity, %{user: user} = opts) do
+  def to_map(%Activity{data: %{"type" => "Follow", "published" => created_at, "object" => followed_id}} = activity, %{user: user} = opts) do
-    created_at = get_in(activity.data, ["published"])
+    created_at = created_at |> date_to_asctime
-    |> date_to_asctime
 
+    followed = User.get_cached_by_ap_id(followed_id)
+    text = "#{user.nickname} started following #{followed.nickname}"
     %{
       "id" => activity.id,
       "user" => UserRepresenter.to_map(user, opts),
       "attentions" => [],
-      "statusnet_html" => "",  # TODO: add summary
+      "statusnet_html" => text,
-      "text" => "",
+      "text" => text,
       "is_local" => true,
       "is_post_verb" => false,
       "created_at" => created_at,
@@ -66,14 +67,12 @@ def to_map(%Activity{data: %{"type" => "Follow"}} = activity, %{user: user} = op
     }
   end
 
-  def to_map(%Activity{} = activity, %{user: user} = opts) do
+  def to_map(%Activity{data: %{"object" => %{"content" => content} = object}} = activity, %{user: user} = opts) do
-    content = get_in(activity.data, ["object", "content"])
+    created_at = object["published"] |> date_to_asctime
-    created_at = get_in(activity.data, ["object", "published"])
+    like_count = object["like_count"] || 0
-    |> date_to_asctime
+    announcement_count = object["announcement_count"] || 0
-    like_count = get_in(activity.data, ["object", "like_count"]) || 0
+    favorited = opts[:for] && opts[:for].ap_id in (object["likes"] || [])
-    announcement_count = get_in(activity.data, ["object", "announcement_count"]) || 0
+    repeated = opts[:for] && opts[:for].ap_id in (object["announcements"] || [])
-    favorited = opts[:for] && opts[:for].ap_id in (activity.data["object"]["likes"] || [])
-    repeated = opts[:for] && opts[:for].ap_id in (activity.data["object"]["announcements"] || [])
 
     mentions = opts[:mentioned] || []
 
@@ -91,22 +90,34 @@ def to_map(%Activity{} = activity, %{user: user} = opts) do
       "is_local" => true,
       "is_post_verb" => true,
       "created_at" => created_at,
-      "in_reply_to_status_id" => activity.data["object"]["inReplyToStatusId"],
+      "in_reply_to_status_id" => object["inReplyToStatusId"],
-      "statusnet_conversation_id" => activity.data["object"]["statusnetConversationId"],
+      "statusnet_conversation_id" => object["statusnetConversationId"],
-      "attachments" => (activity.data["object"]["attachment"] || []) |> ObjectRepresenter.enum_to_list(opts),
+      "attachments" => (object["attachment"] || []) |> ObjectRepresenter.enum_to_list(opts),
       "attentions" => attentions,
       "fave_num" => like_count,
       "repeat_num" => announcement_count,
-      "favorited" => !!favorited,
+      "favorited" => to_boolean(favorited),
-      "repeated" => !!repeated,
+      "repeated" => to_boolean(repeated),
     }
   end
 
   defp date_to_asctime(date) do
     with {:ok, date, _offset} <- date |> DateTime.from_iso8601 do
-      Calendar.Strftime.strftime!(date, "%a %b %d %H:%M:%S %z %Y")
+      Strftime.strftime!(date, "%a %b %d %H:%M:%S %z %Y")
     else _e ->
       ""
     end
   end
+
+  defp to_boolean(false) do
+    false
+  end
+
+  defp to_boolean(nil) do
+    false
+  end
+
+  defp to_boolean(_) do
+    true
+  end
 end

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -1,19 +1,19 @@
 defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
+  alias Ecto.Changeset
   alias Pleroma.{User, Activity, Repo, Object}
-  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.{ActivityPub.ActivityPub, Websub, OStatus}
   alias Pleroma.Web.TwitterAPI.Representers.{ActivityRepresenter, UserRepresenter}
 
   import Ecto.Query
 
-  def create_status(user = %User{}, data = %{}) do
+  def create_status(%User{} = user, %{} = data) do
     attachments = Enum.map(data["media_ids"] || [], fn (media_id) ->
       Repo.get(Object, media_id).data
     end)
 
     context = ActivityPub.generate_context_id
 
-    content = HtmlSanitizeEx.strip_tags(data["status"])
+    content = data["status"] |> HtmlSanitizeEx.strip_tags |> String.replace("\n", "<br>")
-    |> String.replace("\n", "<br>")
 
     mentions = parse_mentions(content)
 
@@ -67,29 +67,29 @@ def create_status(user = %User{}, data = %{}) do
 
     with {:ok, activity} <- ActivityPub.insert(activity) do
       {:ok, activity} = add_conversation_id(activity)
-      Pleroma.Web.Websub.publish(Pleroma.Web.OStatus.feed_path(user), user, activity)
+      Websub.publish(OStatus.feed_path(user), user, activity)
       {:ok, activity}
     end
   end
 
   def fetch_friend_statuses(user, opts \\ %{}) do
-    ActivityPub.fetch_activities([user.ap_id | user.following], opts)
+    activities = ActivityPub.fetch_activities([user.ap_id | user.following], opts)
-    |> activities_to_statuses(%{for: user})
+    activities_to_statuses(activities, %{for: user})
   end
 
   def fetch_public_statuses(user, opts \\ %{}) do
-    ActivityPub.fetch_public_activities(opts)
+    activities = ActivityPub.fetch_public_activities(opts)
-    |> activities_to_statuses(%{for: user})
+    activities_to_statuses(activities, %{for: user})
   end
 
   def fetch_user_statuses(user, opts \\ %{}) do
-    ActivityPub.fetch_activities([], opts)
+    activities = ActivityPub.fetch_activities([], opts)
-    |> activities_to_statuses(%{for: user})
+    activities_to_statuses(activities, %{for: user})
   end
 
   def fetch_mentions(user, opts \\ %{}) do
-    ActivityPub.fetch_activities([user.ap_id], opts)
+    activities = ActivityPub.fetch_activities([user.ap_id], opts)
-    |> activities_to_statuses(%{for: user})
+    activities_to_statuses(activities, %{for: user})
   end
 
   def fetch_conversation(user, id) do
@@ -215,15 +215,18 @@ def parse_mentions(text) do
     # Modified from https://www.w3.org/TR/html5/forms.html#valid-e-mail-address
     regex = ~r/@[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@?[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*/
 
-    Regex.scan(regex, text)
+    regex
+    |> Regex.scan(text)
     |> List.flatten
     |> Enum.uniq
-    |> Enum.map(fn ("@" <> match = full_match) -> {full_match, User.get_cached_by_nickname(match)} end)
+    |> Enum.map(fn ("@" <> match = full_match) ->
+      {full_match, User.get_cached_by_nickname(match)} end)
     |> Enum.filter(fn ({_match, user}) -> user end)
   end
 
   def add_user_links(text, mentions) do
-    Enum.reduce(mentions, text, fn ({match, %User{ap_id: ap_id}}, text) -> String.replace(text, match, "<a href='#{ap_id}'>#{match}</a>") end)
+    Enum.reduce(mentions, text, fn ({match, %User{ap_id: ap_id}}, text) ->
+      String.replace(text, match, "<a href='#{ap_id}'>#{match}</a>") end)
   end
 
   defp add_conversation_id(activity) do
@@ -236,10 +239,10 @@ defp add_conversation_id(activity) do
 
       object = Object.get_by_ap_id(activity.data["object"]["id"])
 
-      changeset = Ecto.Changeset.change(object, data: data["object"])
+      changeset = Changeset.change(object, data: data["object"])
       Repo.update(changeset)
 
-      changeset = Ecto.Changeset.change(activity, data: data)
+      changeset = Changeset.change(activity, data: data)
       Repo.update(changeset)
     end
   end
@@ -260,8 +263,7 @@ def register_user(params) do
       {:ok, UserRepresenter.to_map(user)}
     else
       {:error, changeset} ->
-        errors = Ecto.Changeset.traverse_errors(changeset, fn {msg, _opts} -> msg end)
+        errors = Poison.encode!(Changeset.traverse_errors(changeset, fn {msg, _opts} -> msg end))
-      |> Poison.encode!
         {:error, %{error: errors}}
     end
   end
@@ -303,7 +305,8 @@ defp activity_to_status(%Activity{data: %{"type" => "Like"}} = activity, opts) d
     user = User.get_cached_by_ap_id(actor)
     [liked_activity] = Activity.all_by_object_ap_id(activity.data["object"])
 
-    ActivityRepresenter.to_map(activity, Map.merge(opts, %{user: user, liked_activity: liked_activity}))
+    ActivityRepresenter.to_map(activity,
+      Map.merge(opts, %{user: user, liked_activity: liked_activity}))
   end
 
   # For announces, fetch the announced activity and the user.
@@ -313,7 +316,8 @@ defp activity_to_status(%Activity{data: %{"type" => "Announce"}} = activity, opt
     [announced_activity] = Activity.all_by_object_ap_id(activity.data["object"])
     announced_actor = User.get_cached_by_ap_id(announced_activity.data["actor"])
 
-    ActivityRepresenter.to_map(activity, Map.merge(opts, %{users: [user, announced_actor], announced_activity: announced_activity}))
+    ActivityRepresenter.to_map(activity,
+      Map.merge(opts, %{users: [user, announced_actor], announced_activity: announced_activity}))
   end
 
   defp activity_to_status(activity, opts) do
@@ -323,7 +327,7 @@ defp activity_to_status(activity, opts) do
     mentioned_users = Enum.map(activity.data["to"] || [], fn (ap_id) ->
       User.get_cached_by_ap_id(ap_id)
     end)
-    |> Enum.filter(&(&1))
+    mentioned_users = mentioned_users |> Enum.filter(&(&1))
 
     ActivityRepresenter.to_map(activity, Map.merge(opts, %{user: user, mentioned: mentioned_users}))
   end

lib/pleroma/web/twitter_api/twitter_api_controller.ex

@@ -2,8 +2,9 @@ defmodule Pleroma.Web.TwitterAPI.Controller do
   use Pleroma.Web, :controller
   alias Pleroma.Web.TwitterAPI.TwitterAPI
   alias Pleroma.Web.TwitterAPI.Representers.{UserRepresenter, ActivityRepresenter}
-  alias Pleroma.{Repo, Activity}
+  alias Pleroma.{Web, Repo, Activity}
   alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Ecto.Changeset
 
   def verify_credentials(%{assigns: %{user: user}} = conn, _params) do
     response = user |> UserRepresenter.to_json(%{for: user})
@@ -89,7 +90,7 @@ def follow(%{assigns: %{user: user}} = conn, params) do
 
   def unfollow(%{assigns: %{user: user}} = conn, params) do
     case TwitterAPI.unfollow(user, params) do
-      { :ok, user, unfollowed, } ->
+      {:ok, user, unfollowed} ->
         response = unfollowed |> UserRepresenter.to_json(%{for: user})
         conn
         |> json_reply(200, response)
@@ -98,7 +99,7 @@ def unfollow(%{assigns: %{user: user}} = conn, params) do
   end
 
   def fetch_status(%{assigns: %{user: user}} = conn, %{"id" => id}) do
-    response = TwitterAPI.fetch_status(user, id) |> Poison.encode!
+    response = Poison.encode!(TwitterAPI.fetch_status(user, id))
 
     conn
     |> json_reply(200, response)
@@ -106,7 +107,7 @@ def fetch_status(%{assigns: %{user: user}} = conn, %{ "id" => id }) do
 
   def fetch_conversation(%{assigns: %{user: user}} = conn, %{"id" => id}) do
     id = String.to_integer(id)
-    response = TwitterAPI.fetch_conversation(user, id) |> Poison.encode!
+    response = Poison.encode!(TwitterAPI.fetch_conversation(user, id))
 
     conn
     |> json_reply(200, response)
@@ -132,8 +133,8 @@ def upload_json(conn, %{"media" => media}) do
   def config(conn, _params) do
     response = %{
       site: %{
-        name: Pleroma.Web.base_url,
+        name: Web.base_url,
-        server: Pleroma.Web.base_url,
+        server: Web.base_url,
         textlimit: -1
       }
     }
@@ -188,11 +189,10 @@ def register(conn, params) do
 
   def update_avatar(%{assigns: %{user: user}} = conn, params) do
     {:ok, object} = ActivityPub.upload(params)
-    change = Ecto.Changeset.change(user, %{avatar: object.data})
+    change = Changeset.change(user, %{avatar: object.data})
     {:ok, user} = Repo.update(change)
 
-    response = UserRepresenter.to_map(user, %{for: user})
+    response = Poison.encode!(UserRepresenter.to_map(user, %{for: user}))
-    |> Poison.encode!
 
     conn
     |> json_reply(200, response)

lib/pleroma/web/web.ex

@@ -20,8 +20,7 @@ def controller do
     quote do
       use Phoenix.Controller, namespace: Pleroma.Web
       import Plug.Conn
-      import Pleroma.Web.Router.Helpers
+      import Pleroma.Web.{Gettext, Router.Helpers}
-      import Pleroma.Web.Gettext
     end
   end
 
@@ -33,9 +32,7 @@ def view do
       # Import convenience functions from controllers
       import Phoenix.Controller, only: [get_csrf_token: 0, get_flash: 2, view_module: 1]
 
-      import Pleroma.Web.Router.Helpers
+      import Pleroma.Web.{ErrorHelpers, Gettext, Router.Helpers}
-      import Pleroma.Web.ErrorHelpers
-      import Pleroma.Web.Gettext
     end
   end
 
@@ -75,7 +72,8 @@ def base_url do
 
     protocol = settings |> Keyword.fetch!(:protocol)
 
-    port_fragment = with {:ok, protocol_info} <- settings |> Keyword.fetch(String.to_atom(protocol)),
+    port_fragment = with {:ok, protocol_info} <- settings
+                         |> Keyword.fetch(String.to_atom(protocol)),
                          {:ok, port} <- protocol_info |> Keyword.fetch(:port)
     do
       ":#{port}"

lib/pleroma/web/web_finger/web_finger.ex

@@ -1,10 +1,9 @@
 defmodule Pleroma.Web.WebFinger do
-  alias Pleroma.XmlBuilder
+  alias Pleroma.{User, XmlBuilder}
-  alias Pleroma.User
+  alias Pleroma.{Web, Web.OStatus}
-  alias Pleroma.Web.OStatus
 
-  def host_meta() do
+  def host_meta do
-    base_url  = Pleroma.Web.base_url
+    base_url  = Web.base_url
     {
       :XRD, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
       {
@@ -15,7 +14,7 @@ def host_meta() do
   end
 
   def webfinger(resource) do
-    host = Pleroma.Web.host
+    host = Web.host
     regex = ~r/acct:(?<username>\w+)@#{host}/
     case Regex.named_captures(regex, resource) do
       %{"username" => username} ->
@@ -29,7 +28,7 @@ def represent_user(user) do
     {
       :XRD, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
       [
-        {:Subject, "acct:#{user.nickname}@#{Pleroma.Web.host}"},
+        {:Subject, "acct:#{user.nickname}@#{Web.host}"},
         {:Alias, user.ap_id},
         {:Link, %{rel: "http://schemas.google.com/g/2010#updates-from", type: "application/atom+xml", href: OStatus.feed_path(user)}}
       ]

lib/pleroma/web/web_finger/web_finger_controller.ex

@@ -12,7 +12,7 @@ def host_meta(conn, _params) do
   end
 
   def webfinger(conn, %{"resource" => resource}) do
-    {:ok, response} = Pleroma.Web.WebFinger.webfinger(resource)
+    {:ok, response} = WebFinger.webfinger(resource)
 
     conn
     |> put_resp_content_type("application/xrd+xml")

lib/pleroma/web/websub/websub.ex

@@ -1,4 +1,5 @@
 defmodule Pleroma.Web.Websub do
+  alias Ecto.Changeset
   alias Pleroma.Repo
   alias Pleroma.Web.Websub.WebsubServerSubscription
   alias Pleroma.Web.OStatus.FeedRepresenter
@@ -10,7 +11,8 @@ defmodule Pleroma.Web.Websub do
 
   def verify(subscription, getter \\ &HTTPoison.get/3) do
     challenge = Base.encode16(:crypto.strong_rand_bytes(8))
-    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at) |> to_string
+    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at)
+    lease_seconds = lease_seconds |> to_string
 
     params = %{
       "hub.challenge": challenge,
@@ -25,10 +27,10 @@ def verify(subscription, getter \\ &HTTPoison.get/3 ) do
     with {:ok, response} <- getter.(url, [], [params: params]),
          ^challenge <- response.body
     do
-      changeset = Ecto.Changeset.change(subscription, %{state: "active"})
+      changeset = Changeset.change(subscription, %{state: "active"})
       Repo.update(changeset)
     else _e ->
-      changeset = Ecto.Changeset.change(subscription, %{state: "rejected"})
+      changeset = Changeset.change(subscription, %{state: "rejected"})
       {:ok, subscription} = Repo.update(changeset)
       {:error, subscription}
     end
@@ -39,10 +41,11 @@ def publish(topic, user, activity) do
     where: sub.topic == ^topic and sub.state == "active"
     subscriptions = Repo.all(query)
     Enum.each(subscriptions, fn(sub) ->
-      response = FeedRepresenter.to_simple_form(user, [activity], [user])
+      response = user
+      |> FeedRepresenter.to_simple_form([activity], [user])
       |> :xmerl.export_simple(:xmerl_xml)
 
-      signature = :crypto.hmac(:sha, sub.secret, response) |> Base.encode16
+      signature = Base.encode16(:crypto.hmac(:sha, sub.secret, response))
 
       HTTPoison.post(sub.callback, response, [
             {"Content-Type", "application/atom+xml"},
@@ -65,10 +68,11 @@ def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) d
         callback: callback
       }
 
-      change = Ecto.Changeset.change(subscription, data)
+      change = Changeset.change(subscription, data)
       websub = Repo.insert_or_update!(change)
 
-      change = Ecto.Changeset.change(websub, %{valid_until: NaiveDateTime.add(websub.updated_at, lease_time)})
+      change = Changeset.change(websub, %{valid_until:
+                                          NaiveDateTime.add(websub.updated_at, lease_time)})
       websub = Repo.update!(change)
 
       # Just spawn that for now, maybe pool later.
@@ -81,7 +85,8 @@ def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) d
   end
 
   defp get_subscription(topic, callback) do
-    Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) || %WebsubServerSubscription{}
+    Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) ||
+      %WebsubServerSubscription{}
   end
 
   defp lease_time(%{"hub.lease_seconds" => lease_seconds}) do

lib/xml_builder.ex

@@ -30,13 +30,13 @@ def to_xml(%NaiveDateTime{} = time) do
     NaiveDateTime.to_iso8601(time)
   end
 
-  def to_doc(content), do: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" <> to_xml(content)
+  def to_doc(content), do: ~s(<?xml version="1.0" encoding="UTF-8"?>) <> to_xml(content)
 
   defp make_open_tag(tag, attributes) do
     attributes_string = for {attribute, value} <- attributes do
       "#{attribute}=\"#{value}\""
     end |> Enum.join(" ")
 
-    Enum.join([tag, attributes_string], " ") |> String.strip
+    [tag, attributes_string] |> Enum.join(" ") |> String.strip
   end
 end

mix.exs

@@ -41,6 +41,7 @@ defp deps do
      {:cachex, "~> 2.1"},
      {:httpoison, "~> 0.11.1"},
      {:ex_machina, "~> 2.0", only: :test},
+     {:credo, "~> 0.7", only: [:dev, :test]},
      {:mix_test_watch, "~> 0.2", only: :dev}]
   end
 

mix.lock

@@ -1,4 +1,5 @@
-%{"cachex": {:hex, :cachex, "2.1.0", "fad49b4e78d11c6c314e75bd8c9408f5b78cb065c047442798caed10803ee3be", [:mix], [{:eternal, "~> 1.1", [hex: :eternal, optional: false]}]},
+%{"bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], []},
+  "cachex": {:hex, :cachex, "2.1.0", "fad49b4e78d11c6c314e75bd8c9408f5b78cb065c047442798caed10803ee3be", [:mix], [{:eternal, "~> 1.1", [hex: :eternal, optional: false]}]},
   "calendar": {:hex, :calendar, "0.16.1", "782327ad8bae7c797b887840dc4ddb933f05ce6e333e5b04964d7a5d5f79bde3", [:mix], [{:tzdata, "~> 0.5.8 or ~> 0.1.201603", [hex: :tzdata, optional: false]}]},
   "certifi": {:hex, :certifi, "1.0.0", "1c787a85b1855ba354f0b8920392c19aa1d06b0ee1362f9141279620a5be2039", [:rebar3], []},
   "comeonin": {:hex, :comeonin, "3.0.2", "8b213268a6634bd2e31a8035a963e974681d13ccc1f73f2ae664b6ac4e993c96", [:make, :mix], [{:elixir_make, "~> 0.4", [hex: :elixir_make, optional: false]}]},
@@ -6,6 +7,7 @@
   "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], []},
   "cowboy": {:hex, :cowboy, "1.1.2", "61ac29ea970389a88eca5a65601460162d370a70018afe6f949a29dca91f3bb0", [:rebar3], [{:cowlib, "~> 1.0.2", [hex: :cowlib, optional: false]}, {:ranch, "~> 1.3.2", [hex: :ranch, optional: false]}]},
   "cowlib": {:hex, :cowlib, "1.0.2", "9d769a1d062c9c3ac753096f868ca121e2730b9a377de23dec0f7e08b1df84ee", [:make], []},
+  "credo": {:hex, :credo, "0.7.3", "9827ab04002186af1aec014a811839a06f72aaae6cd5eed3919b248c8767dbf3", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, optional: false]}]},
   "db_connection": {:hex, :db_connection, "1.1.2", "2865c2a4bae0714e2213a0ce60a1b12d76a6efba0c51fbda59c9ab8d1accc7a8", [:mix], [{:connection, "~> 1.0.2", [hex: :connection, optional: false]}, {:poolboy, "~> 1.5", [hex: :poolboy, optional: true]}, {:sbroker, "~> 1.0", [hex: :sbroker, optional: true]}]},
   "decimal": {:hex, :decimal, "1.3.1", "157b3cedb2bfcb5359372a7766dd7a41091ad34578296e951f58a946fcab49c6", [:mix], []},
   "deppie": {:hex, :deppie, "1.1.0", "cfb6fcee7dfb64eb78cb8505537971a0805131899326ad469ef10df04520f451", [:mix], []},