Update stack things

bootstrap-haskell

@@ -147,9 +147,10 @@ echo "Welcome to Haskell!"
 echo
 echo "This script will download and install the following binaries:"
 echo "  * ghcup - The Haskell toolchain installer"
-echo "            (for managing GHC/cabal versions)"
 echo "  * ghc   - The Glasgow Haskell Compiler"
-echo "  * cabal - The Cabal build tool"
+echo "  * cabal - The Cabal build tool for managing Haskell software"
+echo "  * stack - (optional) A cross-platform program for developing Haskell projects"
+echo "  * hls   - (optional) A language server for developers to integrate with their editor/IDE"
 echo
 if [ -z "${GHCUP_USE_XDG_DIRS}" ] ; then
 	echo "ghcup installs only into the following directory,"
@@ -229,6 +230,27 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 		esac
 	done
 
+	printf "\\033[0;35m%s\\033[0m\\n" "Do you want to install stack now?"
+	printf "\\033[0;35m%s\\033[0m\\n" "Stack is a haskell build tool similar to cabal that is used by some projects."
+	printf "\\033[0;35m%s\\033[0m\\n" "Also see https://docs.haskellstack.org/"
+	printf "\\033[0;35m%s\\033[0m\\n" ""
+	printf "\\033[0;35m%s\\033[0m\\n" "Answer with YES or NO and press ENTER."
+	printf "\\033[0;35m%s\\033[0m\\n" ""
+
+	while true; do
+		read -r stack_answer </dev/tty
+
+		case $stack_answer in
+			[Yy]*)
+				eghcup --cache install stack
+				break ;;
+			[Nn]*)
+				break ;;
+			*)
+				echo "Please type YES or NO and press enter.";;
+		esac
+	done
+
     echo "In order to run ghc and cabal, you need to adjust your PATH variable."
     echo "You may want to source '$GHCUP_DIR/env' in your shell"
     echo "configuration to do so (e.g. ~/.bashrc)."

ghcup-0.0.4.yaml

@@ -1839,6 +1839,7 @@ ghcupDownloads:
     2.5.1:
       viTags: []
       viChangeLog: https://github.com/commercialhaskell/stack/blob/master/ChangeLog.md#v251
+      viPostInstall: &stack-post "Stack manages GHC versions internally by default. In order to make it use ghcup installed GHC versions have a look at the options 'system-ghc', 'compiler-check' and 'compiler': https://docs.haskellstack.org/en/stable/yaml_configuration/#system-ghc"
       viArch:
         A_64:
           Linux_UnknownLinux:
@@ -1860,6 +1861,7 @@ ghcupDownloads:
         - Recommended
         - Latest
       viChangeLog: https://github.com/commercialhaskell/stack/blob/master/ChangeLog.md#v271
+      viPostInstall: *stack-post
       viArch:
         A_64:
           Linux_UnknownLinux: