basic code

ChangeLog.md

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+# Changelog for wnpClient
+
+## Unreleased changes

LICENSE

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+Copyright Author name here (c) 2021
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Author name here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# wnpClient

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+import Control.Monad
+import Control.Exception
+import System.IO
+import System.Directory
+import Network.HTTP.Client
+import Network.HTTP.Simple
+import Network.URI
+import qualified Data.ByteString.Char8 as B8
+import GHC.IO.Encoding (setLocaleEncoding)
+import Lib
+
+main :: IO ()
+main = do
+    setLocaleEncoding utf8
+    forever $ do 
+        line <-  getLine 
+        dispatch line
+
+dispatch :: String -> IO ()
+dispatch ('T':'I':'T':'L':'E':':':title) = writeToFile title 0
+dispatch ('A':'R':'T':'I':'S':'T':':':artist) = writeToFile artist 1
+dispatch ('A':'L':'B':'U':'M':':':album) = writeToFile album 2
+dispatch ('C':'O':'V':'E':'R':':':cover) = handleCover cover
+dispatch _ =  return () 
+
+
+
+
+writeToFile:: String -> Int  -> IO()
+writeToFile text position= do  
+    contents <- lines <$> readFile filename
+    let newContent = unlines $ take position contents ++ [text] ++ drop (position+1) contents
+    bracketOnError (openTempFile "." "temp") 
+        (\(tempName,tempHandle) -> do
+            hClose tempHandle
+            removeFile tempName)
+        (\(tempName,tempHandle) -> do
+            hPutStr tempHandle newContent
+            hClose tempHandle
+            renameFile tempName filename)
+
+
+handleCover :: String -> IO ()
+handleCover url= do
+        contents <- lines <$> readFile filename
+        when ((contents !! 3 ) /= url && url /= "") $ do
+            writeToFile (url) 3
+            request <- parseRequest url
+            let fileName = Prelude.last . pathSegments . getUri $ request
+            resp <- httpBS request
+            B8.writeFile coverName  $ getResponseBody resp
+
+
+filename :: FilePath 
+filename= "wnpClient.txt"
+
+
+coverName :: FilePath 
+coverName="cover.jpg"

package.yaml

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+name:                wnpClient
+version:             0.1.0.0
+github:              "githubuser/wnpClient"
+license:             BSD3
+author:              "Author name here"
+maintainer:          "example@example.com"
+copyright:           "2021 Author name here"
+
+extra-source-files:
+- README.md
+- ChangeLog.md
+
+# Metadata used when publishing your package
+# synopsis:            Short description of your package
+# category:            Web
+
+# To avoid duplicated efforts in documentation and dealing with the
+# complications of embedding Haddock markup inside cabal files, it is
+# common to point users to the README.md file.
+description:         Please see the README on GitHub at <https://github.com/githubuser/wnpClient#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+
+library:
+  source-dirs: src
+
+executables:
+  wnpClient:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - wnpClient
+
+tests:
+  wnpClient-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - wnpClient

src/Lib.hs

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+module Lib
+    ( someFunc
+    ) where
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"

stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver:
+  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/0.yaml
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+#   subdirs:
+#   - auto-update
+#   - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver.
+# These entries can reference officially published versions as well as
+# forks / in-progress versions pinned to a git hash. For example:
+#
+# extra-deps:
+# - acme-missiles-0.3
+# - git: https://github.com/commercialhaskell/stack.git
+#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=2.5"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor

stack.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 585393
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/0.yaml
+    sha256: c632012da648385b9fa3c29f4e0afd56ead299f1c5528ee789058be410e883c0
+  original:
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/0.yaml

test/Spec.hs

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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"

wnpClient.cabal

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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.33.0.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: c142288eb64afa7fc89ef6a62257e792bf121215dc61ec643f21fcae99ad5e5a
+
+name:           wnpClient
+version:        0.1.0.0
+description:    Please see the README on GitHub at <https://github.com/githubuser/wnpClient#readme>
+homepage:       https://github.com/githubuser/wnpClient#readme
+bug-reports:    https://github.com/githubuser/wnpClient/issues
+author:         Author name here
+maintainer:     example@example.com
+copyright:      2021 Author name here
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://github.com/githubuser/wnpClient
+
+library
+  exposed-modules:
+      Lib
+  other-modules:
+      Paths_wnpClient
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.7 && <5
+  default-language: Haskell2010
+
+executable wnpClient
+  main-is: Main.hs
+  other-modules:
+      Paths_wnpClient
+  hs-source-dirs:
+      app
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , wnpClient
+    , directory
+    , http-client
+    , network-uri
+    , http-conduit
+    , bytestring
+  default-language: Haskell2010
+
+test-suite wnpClient-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_wnpClient
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , wnpClient
+  default-language: Haskell2010