Day 1

.gitignore

@@ -20,3 +20,5 @@ cabal.project.local
 cabal.project.local~
 .HTF/
 .ghc.environment.*
+AdventOfCode2019.cabal
+stack.yaml.lock

ChangeLog.md

@@ -0,0 +1,3 @@
+# Changelog for AdventOfCode2019
+
+## Unreleased changes

Setup.hs

@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain

app/Main.hs

@@ -0,0 +1,17 @@
+module Main where
+
+import Day1
+import System.IO
+
+
+day1_fuel :: String -> [Fuel]
+day1_fuel = fmap (calculateFuel . read) . lines
+
+main :: IO ()
+main = do
+    r <- readFile "./app/input_day1"
+    putStr "[Day 1-1] Fuel needed: "
+    let fs = day1_fuel r
+    print $ sum fs
+    putStr "[Day 1-2] Fuel needed: "
+    print (sum fs + (sum . fmap calculateFuelOfFuel) fs)

app/input_day1

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package.yaml

@@ -0,0 +1,48 @@
+name:                AdventOfCode2019
+version:             0.1.0.0
+github:              "githubuser/AdventOfCode2019"
+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/AdventOfCode2019#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+
+library:
+  source-dirs: src
+
+executables:
+  AdventOfCode2019-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - AdventOfCode2019
+
+tests:
+  AdventOfCode2019-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - AdventOfCode2019

src/Day1.hs

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+module Day1
+    ( calculateFuel
+    , calculateFuelOfFuel
+    , Mass
+    , Fuel
+    ) where
+
+type Mass = Integer
+type Fuel = Integer
+
+calculateFuel :: Mass -> Fuel
+calculateFuel m =
+    let m' = subtract 2 (div m 3)  in
+        if m' < 0 then 0 else m'
+
+calculateFuelOfFuel :: Fuel -> Fuel
+calculateFuelOfFuel f = go f 0
+  where go finput ftotal
+          | finput <= 0 = ftotal
+          | otherwise = go (calculateFuel finput) (ftotal + calculateFuel finput)

stack.yaml

@@ -0,0 +1,66 @@
+# 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-14.16
+
+# 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: ">=2.1"
+#
+# 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

@@ -0,0 +1,2 @@
+main :: IO ()
+main = putStrLn "Test suite not yet implemented"