ghcup/bootstrap-haskell

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#!/bin/sh
# safety subshell to avoid executing anything in case this script is not downloaded properly
(
: "${GHCUP_INSTALL_BASE_PREFIX:=$HOME}"
die() {
(>&2 printf "\\033[0;31m%s\\033[0m\\n" "$1")
exit 2
}
edo()
{
(>&2 printf "\\033[0;35m%s\\033[0m\\n" "$*")
"$@" || exit 2
}
echo
echo "Welcome to Haskell!"
echo
echo "This will download and install the Glasgow Haskell Compiler (GHC) for "
echo "the Haskell programming language, and the Cabal build tool."
echo
echo "It will add the 'cabal', 'ghc', and 'ghcup' executables to bin directory "
echo "located at: "
echo
echo " $GHCUP_INSTALL_BASE_PREFIX/.ghcup/bin"
echo
echo "and create the environment file $GHCUP_INSTALL_BASE_PREFIX/.ghcup/env"
echo "which you should source in your ~/.bashrc or similar to get the required"
echo "PATH components."
echo
if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
echo "To proceed with the installation press enter, to cancel press ctrl-c."
echo "Note that this script can be re-run at any given time."
echo
# Wait for user input to continue.
# shellcheck disable=SC2034
read -r answer </dev/tty
fi
edo mkdir -p "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup/bin
if command -V "ghcup" >/dev/null 2>&1 ; then
if [ -z "${BOOTSTRAP_HASKELL_NO_UPGRADE}" ] ; then
edo ghcup upgrade
fi
else
edo curl https://raw.githubusercontent.com/haskell/ghcup/master/ghcup > "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup/bin/ghcup
edo chmod +x "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup/bin/ghcup
cat <<-EOF > "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup/env || die "Failed to create env file"
export PATH="\$HOME/.cabal/bin:\${GHCUP_INSTALL_BASE_PREFIX:=\$HOME}/.ghcup/bin:\$PATH"
EOF
# shellcheck disable=SC1090
edo . "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup/env
fi
edo ghcup install
edo ghcup set
edo ghcup install-cabal
edo cabal new-update
printf "\\033[0;35m%s\\033[0m\\n" ""
printf "\\033[0;35m%s\\033[0m\\n" "Installation done!"
printf "\\033[0;35m%s\\033[0m\\n" ""
printf "\\033[0;35m%s\\033[0m\\n" "Don't forget to source $GHCUP_INSTALL_BASE_PREFIX/.ghcup/env in your ~/.bashrc or similar."
printf "\\033[0;35m%s\\033[0m\\n" ""
)