Initial commit

.github/workflows/haskell.yml

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+# packcheck-0.7.0
+# You can use any of the options supported by packcheck as environment
+# variables here.  See https://github.com/composewell/packcheck for all
+# options and their explanation.
+
+name: packcheck
+
+#-----------------------------------------------------------------------------
+# Events on which the build should be triggered
+#-----------------------------------------------------------------------------
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+
+#-----------------------------------------------------------------------------
+# Build matrix
+#-----------------------------------------------------------------------------
+
+jobs:
+  build:
+    name: >-
+      ${{ matrix.name }}
+      ${{ matrix.command }}
+      ${{ matrix.runner }}
+      ${{ matrix.ghc_version }}
+    env:
+      # ------------------------------------------------------------------------
+      # Common options
+      # ------------------------------------------------------------------------
+      # GHC_OPTIONS: "-Werror"
+      CABAL_REINIT_CONFIG: y
+      LC_ALL: C.UTF-8
+
+      # ------------------------------------------------------------------------
+      # What to build
+      # ------------------------------------------------------------------------
+      # DISABLE_TEST: "y"
+      # DISABLE_BENCH: "y"
+      # DISABLE_DOCS: "y"
+      DISABLE_SDIST_BUILD: ${{ matrix.disable_sdist_build }}
+      # DISABLE_SDIST_GIT_CHECK: "y"
+      # DISABLE_DIST_CHECKS: "y"
+
+      # ------------------------------------------------------------------------
+      # Selecting tool versions
+      # ------------------------------------------------------------------------
+      # For updating see: https://downloads.haskell.org/~ghcup/
+      GHCUP_VERSION: 0.1.20.0
+      GHCVER: ${{ matrix.ghc_version }}
+      GHCUP_GHC_OPTIONS: ${{ matrix.ghcup_ghc_options }}
+      # RESOLVER: ${{ matrix.stack_resolver }}
+
+      # ------------------------------------------------------------------------
+      # stack options
+      # ------------------------------------------------------------------------
+      # Note requiring a specific version of stack using STACKVER may fail due to
+      # github API limit while checking and upgrading/downgrading to the specific
+      # version.
+      #STACKVER: "1.6.5"
+      #STACK_UPGRADE: "y"
+      STACK_YAML: "stack.yaml"
+
+      # ------------------------------------------------------------------------
+      # cabal options
+      # ------------------------------------------------------------------------
+      CABAL_CHECK_RELAX: y
+      CABAL_HACKAGE_MIRROR: "hackage.haskell.org:http://hackage.fpcomplete.com"
+      CABAL_PROJECT: ${{ matrix.cabal_project }}
+
+      # ------------------------------------------------------------------------
+      # Where to find the required tools
+      # ------------------------------------------------------------------------
+      PATH: /opt/ghc/bin:/sbin:/usr/sbin:/bin:/usr/bin
+      #TOOLS_DIR: /opt
+
+      # ------------------------------------------------------------------------
+      # Location of packcheck.sh (the shell script invoked to perform CI tests ).
+      # ------------------------------------------------------------------------
+      # You can either commit the packcheck.sh script at this path in your repo or
+      # you can use it by specifying the PACKCHECK_REPO_URL option below in which
+      # case it will be automatically copied from the packcheck repo to this path
+      # during CI tests. In any case it is finally invoked from this path.
+      PACKCHECK: "./packcheck.sh"
+      # If you have not committed packcheck.sh in your repo at PACKCHECK
+      # then it is automatically pulled from this URL.
+      PACKCHECK_GITHUB_URL: "https://raw.githubusercontent.com/composewell/packcheck"
+      PACKCHECK_GITHUB_COMMIT: "7c4e1ab7a59b5ed6e92cfd0da67460a6116be4ac"
+
+      # ------------------------------------------------------------------------
+      # Final build variables
+      # ------------------------------------------------------------------------
+      PACKCHECK_COMMAND: ${{ matrix.command }} ${{ matrix.pack_options }}
+
+    # ubuntu seems to have better support than debian on CI systems
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # The name of the CI is built using the name and other info from CI,
+        # therefore, the "name" field is same for all tests here.
+        #
+        # The reason we have an explicit "name" field here is to force
+        # an additional config instead of adding to an existing config
+        # while adding additional configs.
+        # Look at <https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix>
+        # for more info about adding matrix elements.
+        # Adding any element to the list will increase the number of matrix
+        # elements proportional to the cross product.
+        include:
+
+          - name: ci
+            command: cabal
+            runner: ubuntu-latest
+            ghc_version: 9.8.1
+            cabal_project: cabal.project
+
+          - name: ci
+            command: cabal
+            runner: ubuntu-latest
+            ghc_version: 9.6.3
+            cabal_project: cabal.project
+
+          - name: ci
+            command: cabal
+            runner: macos-latest
+            ghc_version: 9.4.7
+            cabal_project: cabal.project
+            disable_sdist_build: "y"
+
+          - name: ci
+            command: stack
+            runner: ubuntu-latest
+            disable_sdist_build: "y"
+
+          - name: ci
+            ghc_version: 9.2.8
+            command: cabal
+            runner: macos-latest
+            cabal_project: cabal.project
+            disable_sdist_build: "y"
+
+          - name: ci
+            command: cabal
+            runner: windows-latest
+            ghc_version: 9.0.2
+            cabal_project: cabal.project
+            disable_sdist_build: "y"
+
+          - name: ci
+            command: hlint
+            runner: ubuntu-latest
+            pack_options: >-
+              HLINT_VERSION=3.6.1
+              HLINT_OPTIONS="lint"
+              HLINT_TARGETS="src"
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      name: Cache common directories
+      with:
+        path: |
+          ~/.local
+          ~/.cabal
+          ~/.stack
+          ~/.ghcup
+        key: ${{ matrix.command }}-${{ matrix.ghc_version }}-${{ matrix.runner }}
+
+    - name: Download packcheck
+      run: |
+        if test ! -e "$PACKCHECK"
+        then
+          if test -z "$PACKCHECK_GITHUB_COMMIT"
+          then
+              die "PACKCHECK_GITHUB_COMMIT is not specified."
+          fi
+          PACKCHECK_URL=${PACKCHECK_GITHUB_URL}/${PACKCHECK_GITHUB_COMMIT}/packcheck.sh
+          curl --fail -sL -o "$PACKCHECK" $PACKCHECK_URL || exit 1
+          chmod +x $PACKCHECK
+        elif test ! -x "$PACKCHECK"
+        then
+            chmod +x $PACKCHECK
+        fi
+
+    - name: Run packcheck
+      run: |
+        export PATH=$HOME/.local/bin:$HOME/.ghcup/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/opt/curl/bin
+        bash -c "$PACKCHECK $PACKCHECK_COMMAND"

.gitignore

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+# Build files/directories
+.stack-work/
+dist/
+dist-newstyle*/
+.cabal.nix
+autom4te.cache/
+benchmark/bench-report/bin/bench-report
+charts/
+
+# Local GHC and Cabal related files
+.ghc.environment*
+cabal.project.local
+
+# Temp files created by Vim/Neovim
+*.swp
+*.swo
+*~
+
+# Other
+.log
+_doctests/

.hlint.yaml

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+# HLint configuration file
+# https://github.com/ndmitchell/hlint
+##########################
+
+# This file contains a template configuration file, which is typically
+# placed as .hlint.yaml in the root of your project
+
+
+# Warnings currently triggered by your code
+- suggest: {name: "Unused LANGUAGE pragma"}
+- suggest: {name: "Eta reduce"}
+
+# Warnings currently ignored
+- ignore: {name: "Use list literal pattern"}
+- ignore: {name: "Use tuple-section"} # requires GHC extension
+- ignore: {name: "Use fromMaybe"} # may want to use this suggestion, but it didn't match the common idiom of the library
+- ignore: {name: "Use unless"} # low power-to-weight
+- ignore: {name: "Reduce duplication"}
+- ignore: {name: "Use <>"}
+- ignore: {name: "Use fewer imports"}
+- ignore: {name: "Use camelCase"}
+- ignore: {name: "Use <$>"}
+- ignore: {name: "Use uncurry"}
+- ignore: {name: "Redundant $!"}
+- ignore: {name: "Use fmap"}
+- ignore: {name: "Use ++"}
+- ignore: {name: "Replace case with maybe"} # case is more readable
+- ignore: {name: "Use mapMaybe"} # does not make any difference
+
+# Specify additional command line arguments
+#
+- arguments:
+    [ --cpp-include=src
+    , --cpp-define=CABAL_OS_LINUX
+    , --cpp-define=linux_HOST_OS
+    ]
+
+
+# Control which extensions/flags/modules/functions can be used
+#
+# - extensions:
+#   - default: false # all extension are banned by default
+#   - name: [PatternGuards, ViewPatterns] # only these listed extensions can be used
+#   - {name: CPP, within: CrossPlatform} # CPP can only be used in a given module
+#
+# - flags:
+#   - {name: -w, within: []} # -w is allowed nowhere
+#
+# - modules:
+#   - {name: [Data.Set, Data.HashSet], as: Set} # if you import Data.Set qualified, it must be as 'Set'
+#   - {name: Control.Arrow, within: []} # Certain modules are banned entirely
+#
+# - functions:
+#   - {name: unsafePerformIO, within: []} # unsafePerformIO can only appear in no modules
+
+
+# Add custom hints for this project
+#
+# Will suggest replacing "wibbleMany [myvar]" with "wibbleOne myvar"
+# - error: {lhs: "wibbleMany [x]", rhs: wibbleOne x}
+
+
+# Turn on hints that are off by default
+#
+# Ban "module X(module X) where", to require a real export list
+- warn: {name: Use explicit module export list}
+#
+# Replace a $ b $ c with a . b $ c
+# - group: {name: dollar, enabled: true}
+#
+# Generalise map to fmap, ++ to <>
+- group: {name: generalise, enabled: true}
+
+
+# Ignore some builtin hints
+# - ignore: {name: Use let}
+# - ignore: {name: Use const, within: SpecialModule} # Only within certain modules
+
+
+# Define some custom infix operators
+# - fixity: infixr 3 ~^#^~
+
+
+# To generate a suitable file for HLint do:
+# $ hlint --default > .hlint.yaml

.packcheck.ignore

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+.github/workflows/haskell.yml
+.gitignore
+.packcheck.ignore
+cabal.project
+stack.yaml
+.hlint.yaml

Changelog.md

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+# Changelog
+
+## 0.1.0
+
+- Initial release