Fix warnings

.stylish-haskell.yaml

@@ -0,0 +1,233 @@
+# stylish-haskell configuration file
+# ==================================
+
+# The stylish-haskell tool is mainly configured by specifying steps. These steps
+# are a list, so they have an order, and one specific step may appear more than
+# once (if needed). Each file is processed by these steps in the given order.
+steps:
+  # Convert some ASCII sequences to their Unicode equivalents. This is disabled
+  # by default.
+  # - unicode_syntax:
+  #     # In order to make this work, we also need to insert the UnicodeSyntax
+  #     # language pragma. If this flag is set to true, we insert it when it's
+  #     # not already present. You may want to disable it if you configure
+  #     # language extensions using some other method than pragmas. Default:
+  #     # true.
+  #     add_language_pragma: true
+
+  # Align the right hand side of some elements.  This is quite conservative
+  # and only applies to statements where each element occupies a single
+  # line.
+  - simple_align:
+      cases: true
+      top_level_patterns: true
+      records: true
+
+  # Import cleanup
+  - imports:
+      # There are different ways we can align names and lists.
+      #
+      # - global: Align the import names and import list throughout the entire
+      #   file.
+      #
+      # - file: Like global, but don't add padding when there are no qualified
+      #   imports in the file.
+      #
+      # - group: Only align the imports per group (a group is formed by adjacent
+      #   import lines).
+      #
+      # - none: Do not perform any alignment.
+      #
+      # Default: global.
+      align: global
+
+      # The following options affect only import list alignment.
+      #
+      # List align has following options:
+      #
+      # - after_alias: Import list is aligned with end of import including
+      #   'as' and 'hiding' keywords.
+      #
+      #   > import qualified Data.List      as List (concat, foldl, foldr, head,
+      #   >                                          init, last, length)
+      #
+      # - with_alias: Import list is aligned with start of alias or hiding.
+      #
+      #   > import qualified Data.List      as List (concat, foldl, foldr, head,
+      #   >                                 init, last, length)
+      #
+      # - new_line: Import list starts always on new line.
+      #
+      #   > import qualified Data.List      as List
+      #   >     (concat, foldl, foldr, head, init, last, length)
+      #
+      # Default: after_alias
+      list_align: after_alias
+
+      # Right-pad the module names to align imports in a group:
+      #
+      # - true: a little more readable
+      #
+      #   > import qualified Data.List       as List (concat, foldl, foldr,
+      #   >                                           init, last, length)
+      #   > import qualified Data.List.Extra as List (concat, foldl, foldr,
+      #   >                                           init, last, length)
+      #
+      # - false: diff-safe
+      #
+      #   > import qualified Data.List as List (concat, foldl, foldr, init,
+      #   >                                     last, length)
+      #   > import qualified Data.List.Extra as List (concat, foldl, foldr,
+      #   >                                           init, last, length)
+      #
+      # Default: true
+      pad_module_names: true
+
+      # Long list align style takes effect when import is too long. This is
+      # determined by 'columns' setting.
+      #
+      # - inline: This option will put as much specs on same line as possible.
+      #
+      # - new_line: Import list will start on new line.
+      #
+      # - new_line_multiline: Import list will start on new line when it's
+      #   short enough to fit to single line. Otherwise it'll be multiline.
+      #
+      # - multiline: One line per import list entry.
+      #   Type with constructor list acts like single import.
+      #
+      #   > import qualified Data.Map as M
+      #   >     ( empty
+      #   >     , singleton
+      #   >     , ...
+      #   >     , delete
+      #   >     )
+      #
+      # Default: inline
+      long_list_align: inline
+
+      # Align empty list (importing instances)
+      #
+      # Empty list align has following options
+      #
+      # - inherit: inherit list_align setting
+      #
+      # - right_after: () is right after the module name:
+      #
+      #   > import Vector.Instances ()
+      #
+      # Default: inherit
+      empty_list_align: inherit
+
+      # List padding determines indentation of import list on lines after import.
+      # This option affects 'long_list_align'.
+      #
+      # - <integer>: constant value
+      #
+      # - module_name: align under start of module name.
+      #   Useful for 'file' and 'group' align settings.
+      list_padding: 4
+
+      # Separate lists option affects formatting of import list for type
+      # or class. The only difference is single space between type and list
+      # of constructors, selectors and class functions.
+      #
+      # - true: There is single space between Foldable type and list of it's
+      #   functions.
+      #
+      #   > import Data.Foldable (Foldable (fold, foldl, foldMap))
+      #
+      # - false: There is no space between Foldable type and list of it's
+      #   functions.
+      #
+      #   > import Data.Foldable (Foldable(fold, foldl, foldMap))
+      #
+      # Default: true
+      separate_lists: true
+
+      # Space surround option affects formatting of import lists on a single
+      # line. The only difference is single space after the initial
+      # parenthesis and a single space before the terminal parenthesis.
+      #
+      # - true: There is single space associated with the enclosing
+      #   parenthesis.
+      #
+      #   > import Data.Foo ( foo )
+      #
+      # - false: There is no space associated with the enclosing parenthesis
+      #
+      #   > import Data.Foo (foo)
+      #
+      # Default: false
+      space_surround: false
+
+  # Language pragmas
+  - language_pragmas:
+      # We can generate different styles of language pragma lists.
+      #
+      # - vertical: Vertical-spaced language pragmas, one per line.
+      #
+      # - compact: A more compact style.
+      #
+      # - compact_line: Similar to compact, but wrap each line with
+      #   `{-#LANGUAGE #-}'.
+      #
+      # Default: vertical.
+      style: vertical
+
+      # Align affects alignment of closing pragma brackets.
+      #
+      # - true: Brackets are aligned in same column.
+      #
+      # - false: Brackets are not aligned together. There is only one space
+      #   between actual import and closing bracket.
+      #
+      # Default: true
+      align: true
+
+      # stylish-haskell can detect redundancy of some language pragmas. If this
+      # is set to true, it will remove those redundant pragmas. Default: true.
+      remove_redundant: true
+
+  # Replace tabs by spaces. This is disabled by default.
+  # - tabs:
+  #     # Number of spaces to use for each tab. Default: 8, as specified by the
+  #     # Haskell report.
+  #     spaces: 8
+
+  # Remove trailing whitespace
+  - trailing_whitespace: {}
+
+  # Squash multiple spaces between the left and right hand sides of some
+  # elements into single spaces. Basically, this undoes the effect of
+  # simple_align but is a bit less conservative.
+  # - squash: {}
+
+# A common setting is the number of columns (parts of) code will be wrapped
+# to. Different steps take this into account. Default: 80.
+columns: 80
+
+# By default, line endings are converted according to the OS. You can override
+# preferred format here.
+#
+# - native: Native newline format. CRLF on Windows, LF on other OSes.
+#
+# - lf: Convert to LF ("\n").
+#
+# - crlf: Convert to CRLF ("\r\n").
+#
+# Default: native.
+newline: native
+
+# Sometimes, language extensions are specified in a cabal file or from the
+# command line instead of using language pragmas in the file. stylish-haskell
+# needs to be aware of these, so it can parse the file correctly.
+#
+# No language extensions are enabled by default.
+language_extensions:
+  - DeriveGeneric
+  - NoImplicitPrelude
+  - OverloadedStrings
+  - RecordWildCards
+  # - TemplateHaskell
+  # - QuasiQuotes

backend/backend.cabal

@@ -17,6 +17,7 @@ cabal-version:       >=1.10
 
 executable backend
   main-is:             Main.hs
+  ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
   other-modules:       Devel.Main
                      , API
                      , API.Books

backend/src/API.hs

@@ -13,18 +13,13 @@ module API (API, handler) where
 
 
 import           Servant
-import           Servant.HTML.Lucid (HTML)
 import           Types
 
-import           View
-
 import qualified API.Books          as Books
 import qualified API.Catalogue      as Catalogue
 import qualified API.Channels       as Channels
 import qualified API.Users          as Users
 
-data Index = Index
-
 type API = Users.API
       :<|> "api" :> "current" :> Channels.API
       :<|> "api" :> "current" :> Books.API
@@ -38,11 +33,3 @@ handler = Users.handler
     :<|> Catalogue.handler
     :<|> Catalogue.handler
 
-instance ToHtml Index where
-  toHtml _ = do
-    h1_ [class_ "title"] "Home page"
-    p_ [class_ "subtitle"] "Hello world"
-  toHtmlRaw = toHtml
-
-indexHandler :: AppM (AppView Index)
-indexHandler = mkView "Home" Index

backend/src/API/Books.hs

@@ -17,7 +17,7 @@ module API.Books where
 
 import           ClassyPrelude
 import           Control.Lens
-import           Control.Monad.Catch       (MonadThrow, throwM)
+import           Control.Monad.Catch       (throwM)
 import           Control.Monad.Trans.Maybe
 import           Crypto.Hash               (digestFromByteString)
 import           Data.Aeson
@@ -63,8 +63,6 @@ instance FromJSON PostBook
 
 type API = Auth '[SA.BasicAuth, SA.JWT] SafeUser :> BaseAPI
 
-instance Docs.ToCapture (Capture "book_id" BookID) where
-  toCapture _ = Docs.DocCapture "book_id" "The book id"
 
 type BaseAPI = "books" :> Get '[JSON] [JsonBook]
        :<|> "books" :> ReqBody '[JSON] PostBook :> Post '[JSON] JsonBook

backend/src/API/Catalogue.hs

@@ -17,7 +17,7 @@
 module API.Catalogue (VersionedAPI, handler) where
 
 import qualified API.Books
-import           ClassyPrelude
+import           ClassyPrelude hiding (link)
 import           Database
 import           Database.Book (Book(..))
 import qualified Database.Channel as Channel
@@ -46,15 +46,16 @@ data Pagination = Pagination { previous :: Maybe Rel
 
 newtype SubSection = SubSection Rel deriving (Show)
 newtype Acquisition = Acquisition Rel deriving (Show)
+newtype Time = Time { getTime :: UTCTime } deriving Show
 
 data instance Entry 1 = EntryV1 { title :: Text
                                 , identifier :: Text
-                                , updated :: UTCTime
+                                , updated :: Time
                                 , content :: Text
                                 , link :: Either SubSection Acquisition
                                 }
 
-data instance Catalog 1 = CatalogV1 { updated :: UTCTime
+data instance Catalog 1 = CatalogV1 { updated :: Time
                                     , self :: Rel
                                     , start :: Rel
                                     , pagination :: Pagination
@@ -68,7 +69,7 @@ deriving instance Generic (Entry 1)
 
 instance Docs.ToSample (Entry 1) where
   toSamples _ = [("Entry", EntryV1 "title" "identifier" docsTime "content" (Left (SubSection (Rel "sub"))))]
-instance Docs.ToSample UTCTime where
+instance Docs.ToSample Time where
   toSamples _ = [("time", docsTime)]
 instance Docs.ToSample Rel where
   toSamples _ = [("Relative link", Rel "next")]
@@ -76,8 +77,8 @@ instance Docs.ToSample Pagination
 instance Docs.ToSample (Catalog 1) -- where
   -- toSamples _ = [("catalog", CatalogV1 docsTime (Rel "prev") (Rel "next") (Pagination (Just "previous") (Just "next")) [])]
 
-docsTime :: UTCTime
+docsTime :: Time
-docsTime = unsafePerformIO getCurrentTime
+docsTime = Time $ unsafePerformIO getCurrentTime
 
 
 instance ToNode SubSection where
@@ -91,7 +92,7 @@ instance ToNode (Entry 1) where
 <entry>
   <title>#{title}
   <id>#{identifier}
-  <updated>#{iso8601 updated}
+  <updated>#{iso8601 $ getTime updated}
   <content>#{content}
   ^{either toNode toNode link}
   |]
@@ -101,7 +102,7 @@ instance ToNode (Catalog 1) where
 <feed xmlns="http://www.w3.org/2005/Atom" xmlns:opds="http://opds-spec.org/2010/catalog">
   <id>#{unRel self}
   <title>Give me a title
-  <updated>#{iso8601 updated}
+  <updated>#{iso8601 $ getTime updated}
   <link type="application/atom+xml;profile=opds-catalog;kind=navigation" rel="self" href="#{unRel self}">
   <link type="application/atom+xml;profile=opds-catalog;kind=navigation" rel="start" href="#{unRel start}">
   $maybe n <- (next pagination)
@@ -125,7 +126,7 @@ relUrl x = Rel ("/api/current/" <> (pack . uriPath . linkURI $ x))
 
 getBooksV1 :: Channel.ChannelID -> SafeUser -> AppM (Catalog 1)
 getBooksV1 channelID SafeUser{username} = do
-  updated <- liftIO getCurrentTime
+  updated <- Time <$> liftIO getCurrentTime
   let self = relUrl selfUrl
       start = relUrl startUrl
       selfUrl = safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) channelID
@@ -142,7 +143,7 @@ getBooksV1 channelID SafeUser{username} = do
 
 getChannelsV1 :: SafeUser -> AppM (Catalog 1)
 getChannelsV1 SafeUser{username} = do
-  updated <- liftIO getCurrentTime
+  updated <- Time <$> liftIO getCurrentTime
   let self = relUrl selfUrl
       -- I'm not sure if this safe link approach is really useable with this
       -- api hierarchy since I can't access the topmost api from here. Also
@@ -153,7 +154,7 @@ getChannelsV1 SafeUser{username} = do
   entries <- map (fromChannel updated) <$> runDB (Channel.userChannels username)
   pure CatalogV1{..}
   where
-    fromChannel :: UTCTime -> Channel.Channel -> Entry 1
+    fromChannel :: Time -> Channel.Channel -> Entry 1
     fromChannel updated Channel.Channel{..} =
       let url = safeLink (Proxy @(BaseAPI 1)) (Proxy @(ChannelCatalog 1)) identifier
           self = relUrl url

backend/src/API/Channels.hs

@@ -16,7 +16,7 @@ module API.Channels (API, handler, JsonChannel(..)) where
 
 import           ClassyPrelude
 import           Control.Lens
-import           Control.Monad.Catch   (MonadThrow, throwM)
+import           Control.Monad.Catch   (throwM)
 import           Control.Monad.Logger
 import           Data.Aeson
 import           Data.Generics.Product
@@ -49,9 +49,6 @@ instance FromJSON UpdateChannel
 
 type API = Auth '[SA.BasicAuth, SA.Cookie, SA.JWT] SafeUser :> BaseAPI
 
-instance Docs.ToCapture (Capture "channel_id" ChannelID) where
-  toCapture _ = Docs.DocCapture "channel_id" "The channel id"
-
 type BaseAPI = "channels" :> ReqBody '[JSON] JsonChannel :> Post '[JSON] UpdateChannel
           :<|> "channels" :> Capture "channel_id" ChannelID :> ReqBody '[JSON] UpdateChannel :> Put '[JSON] UpdateChannel
           :<|> "channels" :> Get '[JSON] [JsonChannel]

backend/src/API/Users.hs

@@ -1,14 +1,14 @@
-{-# Language DataKinds #-}
+{-# LANGUAGE DataKinds             #-}
-{-# Language TypeFamilies #-}
+{-# LANGUAGE DuplicateRecordFields #-}
-{-# Language OverloadedStrings #-}
+{-# LANGUAGE NoImplicitPrelude     #-}
-{-# Language NoImplicitPrelude #-}
+{-# LANGUAGE OverloadedStrings     #-}
-{-# Language TypeOperators #-}
+{-# LANGUAGE TypeApplications      #-}
-{-# Language DuplicateRecordFields #-}
+{-# LANGUAGE TypeFamilies          #-}
-{-# Language TypeApplications #-}
+{-# LANGUAGE TypeOperators         #-}
 module API.Users  where
 
 import           ClassyPrelude
-import           Control.Monad.Catch (throwM, MonadThrow)
+import           Control.Monad.Catch (throwM)
 import           Data.Aeson
 import           Database            (runDB)
 import           Database.Schema

backend/src/Database/Schema.hs

@@ -3,6 +3,9 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE NoImplicitPrelude          #-}
 {-# LANGUAGE OverloadedStrings          #-}
+{-# LANGUAGE DataKinds          #-}
+{-# LANGUAGE TypeSynonymInstances          #-}
+{-# LANGUAGE FlexibleInstances          #-}
 module Database.Schema where
 
 import           ClassyPrelude
@@ -11,6 +14,7 @@ import           Database.Selda
 import           Database.Selda.Backend
 import           Database.Selda.Generic
 import qualified Servant.Docs           as Docs
+import Servant (Capture)
 import           Web.HttpApiData
 
 -- | User type
@@ -53,8 +57,14 @@ newtype UserID = UserID {unUserID :: Int} deriving (Show)
 
 newtype BookID = BookID {unBookID :: Int} deriving (Show, ToJSON, FromJSON, FromHttpApiData, Eq, Ord, ToHttpApiData, Generic, Num)
 
+instance Docs.ToCapture (Capture "book_id" BookID) where
+  toCapture _ = Docs.DocCapture "book_id" "The book id"
+
 newtype ChannelID = ChannelID {unChannelID :: Int} deriving (Show, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON, Eq, Generic, Num)
 
+instance Docs.ToCapture (Capture "channel_id" ChannelID) where
+  toCapture _ = Docs.DocCapture "channel_id" "The channel id"
+
 newtype TagID = TagID {unTagID :: Int} deriving (Show)
 
 instance SqlType UserID where

backend/src/Main.hs

@@ -1,22 +1,24 @@
-{-# Language OverloadedStrings #-}
+{-# LANGUAGE DataKinds             #-}
-{-# Language RecordWildCards #-}
+{-# LANGUAGE DuplicateRecordFields #-}
-{-# Language DuplicateRecordFields #-}
+{-# LANGUAGE NoImplicitPrelude     #-}
-{-# Language TypeApplications #-}
+{-# LANGUAGE OverloadedStrings     #-}
-{-# Language DataKinds #-}
+{-# LANGUAGE RecordWildCards       #-}
-{-# Language NoImplicitPrelude #-}
+{-# LANGUAGE TypeApplications      #-}
 module Main where
 
-import Server (server)
-import Network.Wai.Handler.Warp (run)
-import Types
-import Configuration
-import Dhall (input, auto)
 import           ClassyPrelude
+import           Configuration
 import           Control.Lens              (view)
 import           Data.Generics.Product
 import           Data.Pool                 (createPool)
-import Database.Selda.PostgreSQL (PGConnectInfo(..), pgOpen, seldaClose)
+import           Database.Selda.PostgreSQL (PGConnectInfo (..), pgOpen,
+                                            seldaClose)
+import           Dhall                     (auto, input)
+import           Network.Wai.Handler.Warp  (run)
 import           Servant.Auth.Server       (generateKey)
+import           Server                    (server)
+import           Types
+import System.Environment (getEnvironment)
 
 defaultMain :: App -> IO ()
 defaultMain = run 8080 . server
@@ -35,5 +37,6 @@ withApp config f = do
 
 main :: IO ()
 main = do
-  c <- input auto "./config/config.dhall"
+  path <- fmap pack . lookup "CONF" <$> getEnvironment
+  c <- input auto (fromMaybe "./config/config.dhall" path)
   withApp c defaultMain