fetch and search ok, need to do an xml parser and a function to connect the two routes

.gitignore

+.stack-work/
+pubMedCrawler.cabal
+*~
\ No newline at end of file

ChangeLog.md

+# Changelog for pubMedCrawler
+
+## Unreleased changes

LICENSE

+Copyright Author name here (c) 2019
+
+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

+# pubMedCrawler

Setup.hs

+import Distribution.Simple
+main = defaultMain

app/Main.hs

+{-# LANGUAGE OverloadedStrings #-}
+
+module Main where
+
+import PUBMED.Client
+import Network.HTTP.Client (newManager)
+import Network.HTTP.Client.TLS (tlsManagerSettings)
+import Servant.Client (runClientM, mkClientEnv, BaseUrl(..), Scheme(..))
+
+
+main :: IO ()
+main = do
+  manager' <- newManager tlsManagerSettings
+  res <- runClientM
+    (fetch (Just "pubmed") ["31059770", "31059556"])
+    (mkClientEnv manager' $ BaseUrl Https "eutils.ncbi.nlm.nih.gov" 443 "entrez/eutils")
+  case res of
+    (Left err) -> print err
+    (Right ok) -> print ok

package.yaml

+name:                pubMedCrawler
+version:             0.1.0.0
+github:              "githubuser/pubMedCrawler"
+license:             BSD3
+author:              "Author name here"
+maintainer:          "example@example.com"
+copyright:           "2019 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/pubMedCrawler#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+- servant
+- servant-client
+- text
+- bytestring
+- xml-conduit
+- http-client
+- http-client-tls
+- http-media
+
+library:
+  source-dirs: src
+
+executables:
+  pubMedCrawler-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - pubMedCrawler
+
+tests:
+  pubMedCrawler-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - pubMedCrawler

src/Lib.hs

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

src/PUBMED/Client.hs

+{-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+
+module PUBMED.Client where
+
+import Servant.API
+import Servant.Client
+
+import Data.Proxy (Proxy(..))
+import Data.ByteString.Lazy (ByteString)
+
+import qualified Network.HTTP.Media as M
+import qualified Data.Text as T
+
+data DB = PUBMED
+
+newtype BsXml = BsXml ByteString
+  deriving (Show)
+
+instance Accept BsXml where
+  contentType _ = "text" M.// "xml"
+
+instance MimeUnrender BsXml BsXml where
+  mimeUnrender _ = Right . BsXml
+
+type PUBMEDAPI =
+  "esearch.fcgi"
+--  :> QueryParam "db" DB
+-- not mandatory since the base db is pubmed
+  :> QueryParam "term" T.Text
+  :> Get '[BsXml] BsXml
+  :<|>
+  "efetch.fcgi"
+  :> QueryParam "db" T.Text
+  :> QueryParams "id" T.Text
+  :> Get '[BsXml] BsXml
+
+pubmedApi :: Proxy PUBMEDAPI
+pubmedApi = Proxy
+
+search :: Maybe T.Text
+  -> ClientM BsXml
+fetch :: Maybe T.Text
+  -> [T.Text]
+  -> ClientM BsXml
+search :<|> fetch = client pubmedApi

stack.yaml

+# 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: lts-13.13
+
+# 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
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+# 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: ">=1.9"
+#
+# 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

test/Spec.hs

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