#!/bin/bash -e

if [ $# -eq 0 ]; then
	EXENAME="$(basename $(pwd))"
	TGT="-"
elif [ $# -eq 1 ]; then
	EXENAME="$1"
	TGT='-'
elif [ $# -eq 2 ]; then
	EXENAME="$1"
	TGT="$2"
else
	echo "USAGE: $0 [library name]" >&2
	exit 99
fi

NAME=$(git config user.name)
EMAIL=$(git config user.email)
USER="${NAME} <${EMAIL}>"
YEAR=$(date '+%Y')

if [ "${CATEGORY}x" = "x" ]; then
	CAT_LINE="-- category:"
else
	CAT_LINE="category:         ${CATEGORY}"
fi

function cabal_file {
	cat <<EOF
name:             ${EXENAME}
version:          0.1.0.0
-- synopsis:
-- description:
license:          BSD3
license-file:     LICENSE
author:           ${USER}
maintainer:       ${USER}
copyright:        ©${YEAR} ${NAME}
${CAT_LINE}
build-type:       Simple
cabal-version:    >= 1.12

executable ${EXENAME}
  hs-source-dirs:      src
  main-is:             Main.hs
  default-extensions:  OverloadedStrings,
                       ScopedTypeVariables
  ghc-options:         -Wall
  build-depends:       base >=4.7 && <4.9
  default-language:    Haskell2010
EOF
}

if [ "x${TGT}" = "x-" ]; then
	cabal_file
else
	cabal_file >${TGT}
fi