# Copyright (c) 2019-2023 Cosmin Truta.
#
# Use, modification and distribution are subject
# to the Boost Software License, Version 1.0.
# See the accompanying file LICENSE_BSL_1_0.txt
# or visit http://www.boost.org/LICENSE_1_0.txt
#
# SPDX-License-Identifier: BSL-1.0

test -f "$BASH_SOURCE" ||
    echo >&2 "warning: this module requires Bash version 3 or newer"
test "${#BASH_SOURCE[@]}" -gt 1 ||
    echo >&2 "warning: this module should be sourced from a Bash script"

# Reset the locale to avoid surprises from locale-dependent commands.
export LC_ALL=C
export LANG=C
export LANGUAGE=C

# Reset CDPATH to avoid surprises from the "cd" command.
export CDPATH=""

# Initialize the global constants CI_SCRIPT_{NAME,DIR} and CI_TOPLEVEL_DIR.
CI_SCRIPT_NAME="$(basename -- "$0")"
CI_SCRIPT_DIR="$(cd "$(dirname -- "$0")" && pwd)"
CI_TOPLEVEL_DIR="$(cd "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"

# Initialize the global constants CI_BUILD_{...} for the host build platform.
CI_BUILD_ARCH="${CI_BUILD_ARCH:-"$(uname -m | tr 'A-Z/\.-' 'a-z____')"}"
CI_BUILD_SYSTEM="${CI_BUILD_SYSTEM:-"$(uname -s | tr 'A-Z/\.-' 'a-z____')"}"

# Initialize the global constants CI_TARGET_{...} for the target platform.
CI_TARGET_ARCH="${CI_TARGET_ARCH:-"$CI_BUILD_ARCH"}"
CI_TARGET_SYSTEM="${CI_TARGET_SYSTEM:-"$CI_BUILD_SYSTEM"}"

function ci_info {
    printf >&2 "%s: %s\\n" "$CI_SCRIPT_NAME" "$*"
}

function ci_warn {
    printf >&2 "%s: warning: %s\\n" "$CI_SCRIPT_NAME" "$*"
}

function ci_err {
    printf >&2 "%s: error: %s\\n" "$CI_SCRIPT_NAME" "$*"
    exit 2
}

function ci_err_internal {
    printf >&2 "%s: internal error: %s\\n" "$CI_SCRIPT_NAME" "$*"
    printf >&2 "ABORTED\\n"
    # Exit with the conventional SIGABRT code.
    exit 134
}

function ci_expr {
    if [[ ${*:-0} == [0-9] ]]
    then
        # This is the same as in the else-branch below, albeit much faster
        # for our intended use cases.
        return $((!$1))
    else
        # The funny-looking compound command "... && return $? || return $?"
        # allows the execution to continue uninterrupted under "set -e".
        expr >/dev/null "$@" && return $? || return $?
    fi
}

function ci_spawn {
    printf >&2 "%s: executing:" "$CI_SCRIPT_NAME"
    printf >&2 " %q" "$@"
    printf >&2 "\\n"
    "$@"
}

# Ensure that the initialization is correct.
[[ $CI_TOPLEVEL_DIR/ci/lib/ci.lib.sh -ef ${BASH_SOURCE[0]} ]] ||
    ci_err_internal "bad or missing \$CI_TOPLEVEL_DIR"
[[ $CI_SCRIPT_DIR/$CI_SCRIPT_NAME -ef $0 ]] ||
    ci_err_internal "bad or missing \$CI_SCRIPT_DIR/\$CI_SCRIPT_NAME"
[[ $CI_BUILD_ARCH && $CI_BUILD_SYSTEM ]] ||
    ci_err_internal "missing \$CI_BUILD_ARCH or \$CI_BUILD_SYSTEM"
[[ $CI_TARGET_ARCH && $CI_TARGET_SYSTEM ]] ||
    ci_err_internal "missing \$CI_TARGET_ARCH or \$CI_TARGET_SYSTEM"