fix: lib: avoid using pager on Windows, the package is not supported

hledger-lib/Hledger/Utils/IO.hs

@@ -9,7 +9,7 @@ The colour scheme may be somewhat hard-coded.
 
 -}
 
-{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE CPP, LambdaCase #-}
 
 module Hledger.Utils.IO (
 
@@ -84,7 +84,9 @@ import           System.IO
   (Handle, IOMode (..), hGetEncoding, hSetEncoding, hSetNewlineMode,
    openFile, stdin, stdout, stderr, universalNewlineMode, utf8_bom, hIsTerminalDevice)
 import           System.IO.Unsafe (unsafePerformIO)
+#ifndef mingw32_HOST_OS
 import           System.Pager
+#endif
 import           Text.Pretty.Simple
   (CheckColorTty(CheckColorTty), OutputOptions(..), 
   defaultOutputOptionsDarkBg, defaultOutputOptionsNoColor, pShowOpt, pPrintOpt)
@@ -130,7 +132,12 @@ pprint' = pPrintOpt CheckColorTty prettyopts'
 pager :: String -> IO ()
 pager s = do
   dumbterm <- (== Just "dumb") <$> lookupEnv "TERM"
-  (if dumbterm then putStrLn else printOrPage . pack) s
+#ifdef mingw32_HOST_OS
+  putStrLn
+#else
+  (if dumbterm then putStrLn else printOrPage . pack)
+#endif
+    s
 
 -- Command line arguments
 

hledger-lib/package.yaml

@@ -59,7 +59,6 @@ dependencies:
 - microlens >=0.4
 - microlens-th >=0.4
 - mtl >=2.2.1
-- pager >=0.1.1.0
 - parser-combinators >=0.4.0
 - pretty-simple >4 && <5
 - regex-tdfa
@@ -78,10 +77,11 @@ dependencies:
 - utf8-string >=0.3.5
 - extra >=1.6.3
 - Glob >= 0.9
-# for ledger-parse:
-#- parsers >=0.5
-#- system-filepath
-#- trifecta >=0.91
+
+when:
+- condition: (!(os(windows)))
+  dependencies:
+  - pager >=0.1.1.0
 
 ghc-options:
 - -Wall