# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)


########################################################################
#
# This file is part of Spack and sets up the spack environment for bash,
# zsh, and dash (sh).  This includes environment modules and lmod support,
# and it also puts spack in your path. The script also checks that at least
# module support exists, and provides suggestions if it doesn't. Source
# it like this:
#
#    . /path/to/spack/share/spack/setup-env.sh
#
########################################################################
# This is a wrapper around the spack command that forwards calls to
# 'spack load' and 'spack unload' to shell functions.  This in turn
# allows them to be used to invoke environment modules functions.
#
# 'spack load' is smarter than just 'load' because it converts its
# arguments into a unique Spack spec that is then passed to module
# commands.  This allows the user to use packages without knowing all
# their installation details.
#
# e.g., rather than requiring a full spec for libelf, the user can type:
#
#     spack load libelf
#
# This will first find the available libelf module file and use a
# matching one.  If there are two versions of libelf, the user would
# need to be more specific, e.g.:
#
#     spack load libelf@0.8.13
#
# This is very similar to how regular spack commands work and it
# avoids the need to come up with a user-friendly naming scheme for
# spack module files.
########################################################################

# prevent infinite recursion when spack shells out (e.g., on cray for modules)
if [ -n "${_sp_initializing:-}" ]; then
    exit 0
fi
export _sp_initializing=true


_spack_shell_wrapper() {
    # Store LD_LIBRARY_PATH variables from spack shell function
    # This is necessary because MacOS System Integrity Protection clears
    # variables that affect dyld on process start.
    for var in LD_LIBRARY_PATH DYLD_LIBRARY_PATH DYLD_FALLBACK_LIBRARY_PATH; do
        eval "if [ -n \"\${${var}-}\" ]; then export SPACK_$var=\${${var}}; fi"
    done

    # Zsh does not do word splitting by default, this enables it for this
    # function only
    if [ -n "${ZSH_VERSION:-}" ]; then
        emulate -L sh
    fi

    # accumulate flags meant for the main spack command
    # the loop condition is unreadable, but it means:
    #     while $1 is set (while there are arguments)
    #       and $1 starts with '-' (and the arguments are flags)
    _sp_flags=""
    while [ ! -z ${1+x} ] && [ "${1#-}" != "${1}" ]; do
        _sp_flags="$_sp_flags $1"
        shift
    done

    # h and V flags don't require further output parsing.
    if [ -n "$_sp_flags" ] && \
       [ "${_sp_flags#*h}" != "${_sp_flags}" ] || \
       [ "${_sp_flags#*V}" != "${_sp_flags}" ];
    then
        command spack $_sp_flags "$@"
        return
    fi

    # set the subcommand if there is one (if $1 is set)
    _sp_subcommand=""
    if [ ! -z ${1+x} ]; then
        _sp_subcommand="$1"
        shift
    fi

    # Filter out use and unuse.  For any other commands, just run the
    # command.
    case $_sp_subcommand in
        "cd")
            _sp_arg=""
            if [ -n "$1" ]; then
                _sp_arg="$1"
                shift
            fi
            if [ "$_sp_arg" = "-h" ] || [ "$_sp_arg" = "--help" ]; then
                command spack cd -h
            else
                LOC="$(spack location $_sp_arg "$@")"
                if [ -d "$LOC" ] ; then
                    cd "$LOC"
                else
                    return 1
                fi
            fi
            return
            ;;
        "env")
            _sp_arg=""
            if [ -n "$1" ]; then
                _sp_arg="$1"
                shift
            fi

            if [ "$_sp_arg" = "-h" ] || [ "$_sp_arg" = "--help" ]; then
                command spack env -h
            else
                case $_sp_arg in
                    activate)
                        # Get --sh, --csh, or -h/--help arguments.
                        # Space needed here becauses regexes start with a space
                        # and `-h` may be the only argument.
                        _a=" $@"
                        # Space needed here to differentiate between `-h`
                        # argument and environments with "-h" in the name.
                        # Also see: https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html#Shell-Parameter-Expansion
                        if [ -z ${1+x} ] || \
                           [ "${_a#* --sh}" != "$_a" ] || \
                           [ "${_a#* --csh}" != "$_a" ] || \
                           [ "${_a#* -h}" != "$_a" ] || \
                           [ "${_a#* --help}" != "$_a" ];
                        then
                            # No args or args contain --sh, --csh, or -h/--help: just execute.
                            command spack env activate "$@"
                        else
                            # Actual call to activate: source the output.
                            stdout="$(command spack $_sp_flags env activate --sh "$@")" || return
                            eval "$stdout"
                        fi
                        ;;
                    deactivate)
                        # Get --sh, --csh, or -h/--help arguments.
                        # Space needed here becauses regexes start with a space
                        # and `-h` may be the only argument.
                        _a=" $@"
                        # Space needed here to differentiate between `--sh`
                        # argument and environments with "--sh" in the name.
                        # Also see: https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html#Shell-Parameter-Expansion
                        if [ "${_a#* --sh}" != "$_a" ] || \
                           [ "${_a#* --csh}" != "$_a" ];
                        then
                            # Args contain --sh or --csh: just execute.
                            command spack env deactivate "$@"
                        elif [ -n "$*" ]; then
                            # Any other arguments are an error or -h/--help: just run help.
                            command spack env deactivate -h
                        else
                            # No args: source the output of the command.
                            stdout="$(command spack $_sp_flags env deactivate --sh)" || return
                            eval "$stdout"
                        fi
                        ;;
                    *)
                        command spack env $_sp_arg "$@"
                        ;;
                esac
            fi
            return
            ;;
        "load"|"unload")
            # Get --sh, --csh, -h, or --help arguments.
            # Space needed here becauses regexes start with a space
            # and `-h` may be the only argument.
            _a=" $@"
            # Space needed here to differentiate between `-h`
            # argument and specs with "-h" in the name.
            # Also see: https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html#Shell-Parameter-Expansion
            if [ "${_a#* --sh}" != "$_a" ] || \
                [ "${_a#* --csh}" != "$_a" ] || \
                [ "${_a#* -h}" != "$_a" ] || \
                [ "${_a#* --list}" != "$_a" ] || \
                [ "${_a#* --help}" != "$_a" ];
            then
                # Args contain --sh, --csh, or -h/--help: just execute.
                command spack $_sp_flags $_sp_subcommand "$@"
            else
                stdout="$(command spack $_sp_flags $_sp_subcommand --sh "$@")" || return
                eval "$stdout"
            fi
            ;;
        *)
            command spack $_sp_flags $_sp_subcommand "$@"
            ;;
    esac
}


########################################################################
# Prepends directories to path, if they exist.
#      pathadd /path/to/dir            # add to PATH
# or   pathadd OTHERPATH /path/to/dir  # add to OTHERPATH
########################################################################
_spack_pathadd() {
    # If no variable name is supplied, just append to PATH
    # otherwise append to that variable.
    _pa_varname=PATH
    _pa_new_path="$1"
    if [ -n "$2" ]; then
        _pa_varname="$1"
        _pa_new_path="$2"
    fi

    # Do the actual prepending here.
    eval "_pa_oldvalue=\${${_pa_varname}:-}"

    _pa_canonical=":$_pa_oldvalue:"
    if [ -d "$_pa_new_path" ] && \
       [ "${_pa_canonical#*:${_pa_new_path}:}" = "${_pa_canonical}" ];
    then
        if [ -n "$_pa_oldvalue" ]; then
            eval "export $_pa_varname=\"$_pa_new_path:$_pa_oldvalue\""
        else
            export $_pa_varname="$_pa_new_path"
        fi
    fi
}


# Determine which shell is being used
_spack_determine_shell() {
    if [ -f "/proc/$$/exe" ]; then
        # If procfs is present this seems a more reliable
        # way to detect the current shell
        _sp_exe=$(readlink /proc/$$/exe)
        # Shell may contain number, like zsh5 instead of zsh
        basename ${_sp_exe} | tr -d '0123456789'
    elif [ -n "${BASH:-}" ]; then
        echo bash
    elif [ -n "${ZSH_NAME:-}" ]; then
        echo zsh
    else
        PS_FORMAT= ps -p $$ | tail -n 1 | awk '{print $4}' | sed 's/^-//' | xargs basename
    fi
}
_sp_shell=$(_spack_determine_shell)


alias spacktivate="spack env activate"

#
# Figure out where this file is.
#
if [ "$_sp_shell" = bash ]; then
    _sp_source_file="${BASH_SOURCE[0]:-}"
elif [ "$_sp_shell" = zsh ]; then
    _sp_source_file="${(%):-%N}"
else
    # Try to read the /proc filesystem (works on linux without lsof)
    # In dash, the sourced file is the last one opened (and it's kept open)
    _sp_source_file_fd="$(\ls /proc/$$/fd 2>/dev/null | sort -n | tail -1)"
    if ! _sp_source_file="$(readlink /proc/$$/fd/$_sp_source_file_fd)"; then
        # Last resort: try lsof. This works in dash on macos -- same reason.
        # macos has lsof installed by default; some linux containers don't.
        _sp_lsof_output="$(lsof -p $$ -Fn0 | tail -1)"
        _sp_source_file="${_sp_lsof_output#*n}"
    fi

    # If we can't find this script's path after all that, bail out with
    # plain old $0, which WILL NOT work if this is sourced indirectly.
    if [ ! -f "$_sp_source_file" ]; then
        _sp_source_file="$0"
    fi
fi

#
# Find root directory and add bin to path.
#
# We send cd output to /dev/null to avoid because a lot of users set up
# their shell so that cd prints things out to the tty.
if [ "$_sp_shell" = zsh ]; then
    _sp_share_dir="${_sp_source_file:A:h}"
    _sp_prefix="${_sp_share_dir:h:h}"
else
    _sp_share_dir="$(cd "$(dirname $_sp_source_file)" > /dev/null && pwd)"
    _sp_prefix="$(cd "$(dirname $(dirname $_sp_share_dir))" > /dev/null && pwd)"
fi
if [ -x "$_sp_prefix/bin/spack" ]; then
    export SPACK_ROOT="${_sp_prefix}"
else
    # If the shell couldn't find the sourced script, fall back to
    # whatever the user set SPACK_ROOT to.
    if [ -n "$SPACK_ROOT" ]; then
        _sp_prefix="$SPACK_ROOT"
        _sp_share_dir="$_sp_prefix/share/spack"
    fi

    # If SPACK_ROOT didn't work, fail.  We should need this rarely, as
    # the tricks above for finding the sourced file are pretty robust.
    if [ ! -x "$_sp_prefix/bin/spack" ]; then
        echo "==> Error: SPACK_ROOT must point to spack's prefix when using $_sp_shell"
        echo "Run this with the correct prefix before sourcing setup-env.sh:"
        echo "    export SPACK_ROOT=</path/to/spack>"
        return 1
    fi
fi
_spack_pathadd PATH "${_sp_prefix%/}/bin"

#
# Check whether a function of the given name is defined
#
_spack_fn_exists() {
    LANG= type $1 2>&1 | grep -q 'function'
}

# Define the spack shell function with some informative no-ops, so when users
# run `which spack`, they see the path to spack and where the function is from.
eval "spack() {
    : this is a shell function from: $_sp_share_dir/setup-env.sh
    : the real spack script is here: $_sp_prefix/bin/spack
    _spack_shell_wrapper \"\$@\"
    return \$?
}"

# Export spack function so it is available in subshells (only works with bash)
if [ "$_sp_shell" = bash ]; then
    export -f spack
    export -f _spack_shell_wrapper
fi

# Identify and lock the python interpreter
for cmd in "${SPACK_PYTHON:-}" python3 python python2; do
    if command -v > /dev/null "$cmd"; then
        export SPACK_PYTHON="$(command -v "$cmd")"
        break
    fi
done

if [ -z "${SPACK_SKIP_MODULES+x}" ]; then
    need_module="no"
    if ! _spack_fn_exists use && ! _spack_fn_exists module; then
        need_module="yes"
    fi;

    #
    # make available environment-modules
    #
    if [ "${need_module}" = "yes" ]; then
        eval `spack --print-shell-vars sh,modules`

        # _sp_module_prefix is set by spack --print-sh-vars
        if [ "${_sp_module_prefix}" != "not_installed" ]; then
            # activate it!
            # environment-modules@4: has a bin directory inside its prefix
            _sp_module_bin="${_sp_module_prefix}/bin"
            if [ ! -d "${_sp_module_bin}" ]; then
                # environment-modules@3 has a nested bin directory
                _sp_module_bin="${_sp_module_prefix}/Modules/bin"
            fi

            # _sp_module_bin and _sp_shell are evaluated here; the quoted
            # eval statement and $* are deferred.
            _sp_cmd="module() { eval \`${_sp_module_bin}/modulecmd ${_sp_shell} \$*\`; }"
            eval "$_sp_cmd"
            _spack_pathadd PATH "${_sp_module_bin}"
        fi;
    else
        stdout="$(command spack --print-shell-vars sh)" || return
        eval "$stdout"
    fi;


    #
    # set module system roots
    #
    _sp_multi_pathadd() {
        local IFS=':'
        if [ "$_sp_shell" = zsh ]; then
            emulate -L sh
        fi
        for pth in $2; do
            for systype in ${_sp_compatible_sys_types}; do
                _spack_pathadd "$1" "${pth}/${systype}"
            done
        done
    }
    _sp_multi_pathadd MODULEPATH "$_sp_tcl_roots"
fi

# Add programmable tab completion for Bash
#
if test "$_sp_shell" = bash || test -n "${ZSH_VERSION:-}"; then
    source $_sp_share_dir/spack-completion.bash
fi

# done: unset sentinel variable as we're no longer initializing
unset _sp_initializing
export _sp_initializing