Merge branch 'bootstrap'

README.md

@@ -19,6 +19,24 @@ Similar in scope to [rustup](https://github.com/rust-lang-nursery/rustup.rs), [p
 
 ## Installation
 
+### Simple bootstrap of ghcup, GHC and cabal-install
+
+```sh
+# complete bootstrap
+curl https://raw.githubusercontent.com/haskell/ghcup/master/bootstrap-haskell -sSf | sh
+
+# prepare your environment
+. "$HOME/.ghcup/env"
+echo '. $HOME/.ghcup/env' >> "$HOME/.bashrc" # or similar
+
+# now create a project, such as:
+mkdir myproject && cd myproject
+cabal init -n --is-executable
+cabal v2-run
+```
+
+### Manual install
+
 Just place the `ghcup` shell script into your `PATH` anywhere.
 
 E.g.:

bootstrap-haskell

@@ -0,0 +1,75 @@
+#!/bin/sh
+
+# safety subshell to avoid executing anything in case this script is not downloaded properly
+(
+
+die() {
+    (>&2 printf "\\033[0;31m%s\\033[0m\\n" "$1")
+    exit 2
+}
+
+edo()
+{
+	printf "\\033[0;35m%s\\033[0m\\n" "$*"
+    "$@" || 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 "  $HOME/.ghcup/bin"
+echo
+echo "and create the environment file $HOME/.ghcup/env"
+echo "which you should source in your ~/.bashrc or similar to get the required"
+echo "PATH components."
+echo
+
+if [ -z "${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 "${HOME}"/.ghcup/bin
+
+if command -V "ghcup" >/dev/null 2>&1 ; then
+	if [ -z "${BOOTSTRAP_HASKELL_NO_UPGRADE}" ] ; then
+		edo ghcup upgrade
+	fi
+else
+	edo curl https://raw.githubusercontent.com/haskell/ghcup/master/ghcup > "${HOME}"/.ghcup/bin/ghcup
+	edo chmod +x "${HOME}"/.ghcup/bin/ghcup
+
+	cat <<-EOF > "${HOME}"/.ghcup/env || die "Failed to create env file"
+		export PATH="\$HOME/.cabal/bin:\$HOME/.ghcup/bin:\$PATH"
+		EOF
+	# shellcheck disable=SC1090
+	edo . "${HOME}"/.ghcup/env
+fi
+
+edo ghcup install
+
+edo ghcup set
+edo ghcup install-cabal
+
+edo cabal new-update
+edo cabal new-install --symlink-bindir="$HOME/.cabal/bin" cabal-install
+
+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 $HOME/.ghcup/env in your ~/.bashrc or similar."
+printf "\\033[0;35m%s\\033[0m\\n" ""
+
+
+)

ghcup

@@ -239,13 +239,15 @@ set_usage() {
 Set the currently active GHC to the specified version
 
 USAGE:
-    ${SCRIPT} set [FLAGS] <VERSION>
+    ${SCRIPT} set [FLAGS] [VERSION|TAG]
 
 FLAGS:
     -h, --help       Prints help information
 
 ARGS:
-    <VERSION>        E.g. \"8.4.3\" or \"8.6.1\"
+    [VERSION|TAG]    E.g. \"8.4.3\" or \"8.6.3\" or
+                     a tag like \"recommended\" or \"latest\"
+                     (default: discovers recommended version)
 
 DISCUSSION:
     Sets the the current GHC version by creating non-versioned
@@ -1004,34 +1006,6 @@ posix_realpath() {
     unset mysource mydir posix_realpath_error
 }
 
-# @FUNCTION: is_sourced
-# @DESCRIPTION:
-# Tries to figure out if we are being sourced. Based on
-#   https://stackoverflow.com/a/28776166
-# @RETURNS: 0 if we are being sourced, 1 otherwise
-is_sourced() {
-    if [ -n "$ZSH_EVAL_CONTEXT" ]; then
-        case $ZSH_EVAL_CONTEXT in
-           *:file)
-               return 0 ;;
-       esac
-    elif [ -n "$KSH_VERSION" ]; then
-        # shellcheck disable=SC2154
-        [ "$(cd "$(dirname -- "$0")" && pwd -P)/$(basename -- "$0")" != "$(cd "$(dirname -- "${.sh.file}")" && pwd -P)/$(basename -- "${.sh.file}")" ] && return 0
-    elif [ -n "$BASH_VERSION" ]; then
-        # shellcheck disable=SC2128
-        [ "$0" != "$BASH_SOURCE" ] && return 0
-    else # All other shells: examine $0 for known shell binary filenames
-        # Detects `sh` and `dash`; add additional shell filenames as needed.
-        case ${0##*/} in
-            sh|dash)
-               return 0 ;;
-       esac
-   fi
-
-   # assume we are not sourced, if our above checks didn't find it
-   return 1
-}
 
 # @FUNCTION: get_meta_version_file
 # @DESCRIPTION:
@@ -1188,7 +1162,8 @@ install_ghc() {
         if ${FORCE} ; then
             echo "GHC already installed in ${inst_location}, overwriting!"
         else
-            die "GHC already installed in ${inst_location}, use --force to overwrite"
+            warning_message "GHC already installed in ${inst_location}, use --force to overwrite"
+            exit 0
         fi
         first_install=false
     fi
@@ -1693,11 +1668,9 @@ fi
     #--[ Command line parsing and entry point ]--#
     ##############################################
 
-if ! is_sourced ; then
+[ $# -lt 1 ] && usage
 
-    [ $# -lt 1 ] && usage
+while [ $# -gt 0 ] ; do
-
-    while [ $# -gt 0 ] ; do
     case $1 in
     -v|--verbose)
         VERBOSE=true
@@ -1784,8 +1757,24 @@ if ! is_sourced ; then
                       break;;
                esac
            done
-               [ -n "${GHC_VER}" ] || set_usage
+
+           if [ -z "${GHC_VER}" ] ; then
+               _tool_ver="$(get_tool_ver_from_tag "ghc" "recommended")"
+               if [ -z "${_tool_ver}" ] ; then
+                   die "Could not find a recommended GHC version, please report a bug at ${BUG_URL}!"
+               fi
+               set_ghc "${_tool_ver}"
+           else
+               # could be a version or a tag, let's check
+               if array_contains "${GHC_VER}" "$(known_tool_versions "ghc")" ; then
                    set_ghc "${GHC_VER}"
+               elif array_contains "${GHC_VER}" "$(known_tool_tags "ghc")" ; then
+                   set_ghc "$(get_tool_ver_from_tag "ghc" "${GHC_VER}")"
+               else
+                   die "\"${GHC_VER}\" is not a known version or tag!"
+               fi
+           fi
+
            break;;
        upgrade)
            shift 1
@@ -1907,8 +1896,7 @@ if ! is_sourced ; then
        esac
        break;;
     esac
-    done
+done
-fi # is_sourced
 
 
 # vim: tabstop=4 shiftwidth=4 expandtab