johnsonjh/duma

#!/usr/bin/env sh
# shellcheck disable=SC3040
# vim: filetype=sh:tabstop=4:tw=76

# shellcheck disable=SC2006,SC2046,SC2065
test _$(printf '%s' "asdf" 2> /dev/null) != "_asdf" > /dev/null &&
    printf '%s\n' \
        "Error: This shell seems to be csh, which is not supported." &&
    exit 1

set +e > /dev/null 2>&1
set +u > /dev/null 2>&1

# shellcheck disable=SC2046
eval export $(locale 2> /dev/null) > /dev/null 2>&1 || true
DUALCASE=1 && export DUALCASE
LC_ALL=C && export LC_ALL
LANGUAGE=C && export LANGUAGE
LANG=C && export LANG
(unset CDPATH > /dev/null 2>&1) > /dev/null 2>&1 &&
    unset CDPATH > /dev/null 2>&1

if [ ".${ZSH_VERSION:-}" != "." ] &&
    (emulate sh 2> /dev/null) > /dev/null 2>&1; then
    emulate sh > /dev/null 2>&1
    NULLCMD=: && export NULLCMD
    # shellcheck disable=SC2142
    alias -g '${1+"$@"}'='"$@"' > /dev/null 2>&1
    unalias -a > /dev/null 2>&1 || true > /dev/null 2>&1
    unalias -m '*' > /dev/null 2>&1
    disable -f -m '*' > /dev/null 2>&1
    setopt pipefail > /dev/null 2>&1
    POSIXLY_CORRECT=1 && export POSIXLY_CORRECT
    POSIX_ME_HARDER=1 && export POSIX_ME_HARDER
elif [ ".${BASH_VERSION:-}" != "." ] &&
    (set -o posix 2> /dev/null) > /dev/null 2>&1; then
    set -o posix > /dev/null 2>&1
    set -o pipefail > /dev/null 2>&1
    POSIXLY_CORRECT=1 && export POSIXLY_CORRECT
    POSIX_ME_HARDER=1 && export POSIX_ME_HARDER
    unalias -a > /dev/null 2>&1 || true > /dev/null 2>&1
fi

for as_var in BASH_ENV ENV MAIL MAILPATH; do
    # shellcheck disable=SC1083,SC2015
    eval test x\${"${as_var:?}"+set} = xset &&
        ( 
            (unset "${as_var:-}") ||
                {
                    printf >&2 '%s\n' \
                        "Error: clear environment failed."
                    exit 1
                }
        ) &&
        unset "${as_var:-}" || true
done

TZ="UTC" && export TZ > /dev/null 2>&1

set -u > /dev/null 2>&1
set -e > /dev/null 2>&1

get_git_info()
{
    if command command true 2> /dev/null 1>&2; then
        if command git version 2> /dev/null 1>&2; then
            GITTEST=$(git version 2> /dev/null)
            # shellcheck disable=SC2236
            if [ -n "${GITTEST:-}" ] &&
                [ ! -z "${GITTEST:-}" ]; then
                BRANCH=$(git branch --show-current 2> /dev/null)
                CDDATE=" "$(git show -s --format="%cd" \
                    --date="format:%Y-%m-%d" 2> /dev/null)
                GITVER=$(git describe --long --dirty --tags --always \
                    2> /dev/null)
                if [ ! -n "${BRANCH:-}" ] ||
                    [ -z "${BRANCH:-}" ]; then
                    BRANCH="nobranch"
                fi
                if [ "${BRANCH:-}" = "master" ] ||
                    [ "${BRANCH:-}" = "main" ] ||
                    [ "${BRANCH:-}" = "trunk" ] ||
                    [ "${BRANCH:-}" = "nobranch" ]; then
                    if [ -n "${GITVER:-}" ] &&
                        [ ! -z "${GITVER:-}" ]; then
                        GIT_OUT=$(printf '%s' \
                            "${GITVER:?}${CDDATE:?}" |
                                sed -e 's/-0-g.* / /' \
                                    -e 's/-[0-9]\+-g/+-g/')
                    fi
                else
                    if [ -n "${GITVER:-}" ] &&
                        [ ! -z "${GITVER:-}" ]; then
                        GIT_OUT=$(printf '%s' \
                            "${GITVER:?}-${BRANCH:?}${CDDATE:?}" |
                                sed -e 's/-0-g.* / /' \
                                    -e 's/-[0-9]\+-g/+-g/')
                    fi
                fi
            fi
        else
            printf >&2 '%s\n' \
                "Error: git version failed."
            exit 1
        fi
    else
        printf >&2 '%s\n' \
            "Error: command true failed."
        exit 1
    fi

    GIT_SOURCE_INFO="${GIT_OUT:-0.0.0} "
    GIT_SOURCE_XFRM=$(printf '%s\n' "${GIT_SOURCE_INFO:?}" | \
        sed -e 's/VERSION_//' -e 's/_/\./g' 2> /dev/null) ||
        {
            printf >&2 '%s\n' \
                "Error: sed failed."
            exit 1
        }

    # shellcheck disable=SC2236
    if [ -n "${GIT_SOURCE_XFRM:-}" ] &&
        [ ! -z "${GIT_SOURCE_XFRM:-}" ]; then
        printf '%s\n' \
            "${GIT_SOURCE_XFRM:?}"
    else

        printf '%s\n' \
            "${GIT_SOURCE_INFO:?}"
    fi

}

get_utc_date()
{
    UTC_BLD_DATE=$(TZ=UTC date -u "+%Y-%m-%d" 2> /dev/null) ||
        {
            printf >&2 '%s\n' \
                "Error: date failed."
            exit 1
        }
    # shellcheck disable=SC2236
    if [ -n "${UTC_BLD_DATE:-}" ] &&
        [ ! -z "${UTC_BLD_DATE:-}" ]; then
        UTC_BLD_DATE_INFO="(compiled ${UTC_BLD_DATE:?})"
    else

        UTC_BLD_DATE_INFO=""
    fi

    printf '%s\n' \
        "${UTC_BLD_DATE_INFO:-}"
}

BUILD_VER="$(get_git_info)" ||
    {
        printf >&2 '%s\n' \
            "Error: get_git_info() failed."
        exit 1
    }
BUILD_UTC="$(get_utc_date)" ||
    {
        printf >&2 '%s\n' \
            "Error: get_utc_date() failed."
        exit 1
    }
test "${REPRODUCIBLE:-}" = "1" &&
    {
        BUILD_UTC=""
    }

# shellcheck disable=SC1003
printf '%s\n' \
    '/* NOTICE: Auto-generated by "make_git_source_version.sh" */' \
    "/* MODIFICATIONS MADE DIRECTLY TO THIS FILE WILL BE LOST. */" \
    "" \
    "#ifndef GIT_SOURCE_VERSION_VERINFO_H" \
    "#define GIT_SOURCE_VERSION_VERINFO_H" \
    "" \
    '#define GIT_SOURCE_VERSION \' \
    "    \"${BUILD_VER:?}${BUILD_UTC:-}\"" \
    "" \
    "#endif /* GIT_SOURCE_VERSION_VERINFO_H */" \
    > "./verinfo.h" ||
    {
        printf >&2 '%s\n' \
            "Error: writing verinfo.h failed."
        exit 1
    }

# Local Variables:
# mode: sh
# sh-shell: sh
# sh-indentation: 4
# sh-basic-offset: 4
# tab-width: 4
# End: