initial skeleton

.gitignore

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+bin/

LICENSE

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+Copyright (c) 2017 Veit Heller
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# bc
+
+A better basic calculator. Like the original `bc`, but with a better
+prompt.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

bc.cabal

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+name:                bc
+version:             0.1.0.0
+synopsis:            A better calculator
+description:         Like bc, but with a better prompt.
+license:             MIT
+license-file:        LICENSE
+author:              Veit Heller
+maintainer:          veit@veitheller.de
+copyright:           
+category:            Language
+build-type:          Simple
+extra-source-files:  ChangeLog.md, README.md
+cabal-version:       >=1.10
+
+executable bc
+  main-is:             Main.hs
+  other-modules:       
+  build-depends:       base >=4.9 && <4.10
+  hs-source-dirs:      src
+  default-language:    Haskell2010

src/BC/Config.hs

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+module Bc.Prompt where
+
+versionStr = "0.1.0.0"
+
+prompt = "> "

src/BC/Prompt.hs

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+module BC.Prompt (startPrompt) where
+
+import BC.Config
+
+printHeader :: IO ()
+printHeader = do
+  putStrLn "bc (better calculator) version " ++ versionStr
+  putStrLn "Copyright 2017 Veit Heller"
+  putStrLn "This is free software with ABSOLUTELY NO WARRANTY.\n"
+
+
+prompt :: IO ()
+prompt = runInputT settings $ poll prompt
+  where poll p = do
+        input <- getInputLine p
+        case input of
+          Nothing -> return ""
+          Just str -> return str
+
+
+startPrompt :: IO ()
+startPrompt = do
+  printHeader
+  prompt

src/Main.hs

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+module Main where
+
+import BC.Prompt
+
+main :: IO ()
+main = startPrompt