Query tankerkönig API with given apikey and station

src/TK2MQTT.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE OverloadedStrings #-}
 
 module TK2MQTT (
   runTK2MQTT,
@@ -8,12 +8,17 @@ module TK2MQTT (
 import System.Environment qualified as Env
 import System.IO
 
+import Control.Monad.IO.Class
 import Control.Exception qualified as Exception
 import System.IO.Error qualified as IOError
 
-runTK2MQTT :: IO ()
-runTK2MQTT = do
-  putStrLn "Hello"
+import Data.Aeson
+import Network.HTTP.Req
+
+runTK2MQTT :: String -> String -> IO ()
+runTK2MQTT apikey stationId = runReq defaultHttpConfig $ do
+  r <- req GET (https "creativecommons.tankerkoenig.de" /: "json" /: "prices.php") NoReqBody jsonResponse ("apikey" =: apikey <> "ids" =: stationId)
+  liftIO $ print (responseBody r :: Value)
 
 eitherToError :: Show a => Either a b -> IO b
 eitherToError = either (Exception.throwIO . IOError.userError . show) return
@@ -23,4 +28,6 @@ handleError e = do
   hPutStrLn stderr $ "I ran into an issue: " <> show e
 
 defaultMain :: IO ()
-defaultMain = Exception.catch runTK2MQTT handleError
+defaultMain = do
+  [apikey, stationId] <- Env.getArgs
+  Exception.catch (runTK2MQTT apikey stationId) handleError

tk2mqtt.cabal

@@ -0,0 +1,119 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.7.
+--
+-- see: https://github.com/sol/hpack
+
+name:           tk2mqtt
+version:        0.0.1.0
+description:    Tankerkönig-to-MQTT gateway
+author:         Alexander Kobjolke
+maintainer:     alex@jakalx.net
+copyright:      Alexander Kobjolke 2023
+license:        MIT
+build-type:     Simple
+extra-source-files:
+    README.org
+
+library
+  exposed-modules:
+      TK2MQTT
+      TK2MQTT.Internal
+  other-modules:
+      Paths_tk2mqtt
+  hs-source-dirs:
+      src
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes
+  build-depends:
+      aeson
+    , base >=4.13 && <5
+    , containers
+    , directory
+    , net-mqtt
+    , req
+    , text
+    , time
+  default-language: GHC2021
+
+executable tk2mqtt
+  main-is: tk2mqtt.hs
+  other-modules:
+      Paths_tk2mqtt
+  hs-source-dirs:
+      app
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes
+  build-depends:
+      aeson
+    , base >=4.13 && <5
+    , containers
+    , directory
+    , net-mqtt
+    , req
+    , text
+    , time
+    , tk2mqtt
+  default-language: GHC2021
+
+test-suite doctest
+  type: exitcode-stdio-1.0
+  main-is: Doctest.hs
+  other-modules:
+      Paths_tk2mqtt
+  hs-source-dirs:
+      test/doctest
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes
+  build-tool-depends:
+      doctest:doctest
+  build-depends:
+      aeson
+    , base >=4.13 && <5
+    , containers
+    , directory
+    , net-mqtt
+    , req
+    , text
+    , time
+  default-language: Haskell2010
+
+test-suite spec
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      TK2MQTTSpec
+      Paths_tk2mqtt
+  hs-source-dirs:
+      test/spec
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes
+  cpp-options: -DTEST
+  build-tool-depends:
+      hspec-discover:hspec-discover
+  build-depends:
+      QuickCheck
+    , aeson
+    , base >=4.13 && <5
+    , containers
+    , directory
+    , hspec
+    , net-mqtt
+    , quickcheck-instances
+    , req
+    , text
+    , time
+    , tk2mqtt
+  default-language: GHC2021