ghcup-hs/scripts/hooks/stack/ghc-install.sh

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#!/bin/sh
# !! KEEP THIS SCRIPT POSIX COMPLIANT !!
# see https://docs.haskellstack.org/en/stable/yaml_configuration/#ghc-installation-customisation-experimental
# for documentation about hooks
set -eu
case $HOOK_GHC_TYPE in
bindist)
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ghc_path=$(ghcup whereis ghc "$HOOK_GHC_VERSION" || { ghcup install ghc "$HOOK_GHC_VERSION" >/dev/null && ghcup whereis ghc "$HOOK_GHC_VERSION" ; }) || { >&2 echo "Installing $HOOK_GHC_VERSION via ghcup failed" exit 3 ;}
printf "%s" "${ghc_path}"
;;
git)
# TODO: should be somewhat possible
>&2 echo "Hook doesn't support installing from source"
exit 1
;;
*)
>&2 echo "Unsupported GHC installation type: $HOOK_GHC_TYPE"
exit 2
;;
esac