Add comments to modules

src/PostgREST/DbRequestBuilder.hs

@@ -1,3 +1,11 @@
+{-|
+Module      : PostgREST.DbRequestBuilder
+Description : PostgREST database request builder
+
+This module is in charge of building an intermediate representation(ReadRequest, MutateRequest) between the HTTP request and the final resulting SQL query.
+
+A query tree is built in case of resource embedding. By inferring the relationship between tables, join conditions are added for every embedded resource.
+-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE DuplicateRecordFields#-}
 {-# LANGUAGE LambdaCase #-}

src/PostgREST/DbStructure.hs

@@ -1,3 +1,13 @@
+{-|
+Module      : PostgREST.DbStructure
+Description : PostgREST schema cache
+
+This module contains queries that target PostgreSQL system catalogs, these are used to build the schema cache(DbStructure).
+
+The schema cache is necessary for resource embedding, foreign keys are used for inferring the relationships between tables.
+
+These queries are executed once at startup or when PostgREST is reloaded.
+-}
 {-# LANGUAGE FlexibleContexts      #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE QuasiQuotes           #-}

src/PostgREST/Error.hs

@@ -1,3 +1,7 @@
+{-|
+Module      : PostgREST.Error
+Description : PostgREST error HTTP responses
+-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 {-# LANGUAGE FlexibleInstances    #-}
 {-# LANGUAGE TypeSynonymInstances #-}

src/PostgREST/Middleware.hs

@@ -1,3 +1,7 @@
+{-|
+Module      : PostgREST.Middleware
+Description : Sets the PostgreSQL GUCs, role, search_path and pre-request function. Validates JWT.
+-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE FlexibleContexts #-}

src/PostgREST/OpenAPI.hs

@@ -1,10 +1,14 @@
+{-|
+Module      : PostgREST.OpenAPI
+Description : Generates the OpenAPI output
+-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module PostgREST.OpenAPI (
   encodeOpenAPI
-  , isMalformedProxyUri
-  , pickProxy
-  ) where
+, isMalformedProxyUri
+, pickProxy
+) where
 
 import           Control.Arrow               ((&&&))
 import           Control.Lens

src/PostgREST/Parsers.hs

@@ -1,3 +1,9 @@
+{-|
+Module      : PostgREST.Parsers
+Description : PostgREST parser combinators
+
+This module is in charge of parsing all the querystring values in an url, e.g. the select, id, order in `/projects?select=id,name&id=eq.1&order=id,name.desc`.
+-}
 module PostgREST.Parsers where
 
 import           Protolude                     hiding (try, intercalate, replace, option)

src/PostgREST/RangeQuery.hs

@@ -1,3 +1,7 @@
+{-|
+Module      : PostgREST.RangeQuery
+Description : Logic regarding the `Range` header and `limit`, `offset` querystring arguments.
+-}
 module PostgREST.RangeQuery (
   rangeParse
 , rangeRequested

src/PostgREST/Types.hs

@@ -1,3 +1,7 @@
+{-|
+Module      : PostgREST.Types
+Description : PostgREST common types and functions used by the rest of the modules
+-}
 {-# LANGUAGE DuplicateRecordFields    #-}
 module PostgREST.Types where
 import           Protolude