run-kotlin-tool.sh.in

#!@EPREFIX@/bin/bash

# This script can be used as the symbolic link target of Kotlin executables
# under /usr/bin, such as /usr/bin/kotlin and /usr/bin/kotlinc, as well as
# versioned executables like /usr/bin/kotlinc1.5.  It runs the executable for
# either the Kotlin version specified in the executable name in case it is
# versioned, or the Kotlin package configured with eselect-kotlin.

PREF_SYSTEM_ROOT="@EPREFIX@/etc/eselect/kotlin/homes"

tool="$(basename "$0")"

# The GENTOO_KOTLIN_VER environment variable can be used to specify a feature
# release of Kotlin to use.  This is mainly designed for eclasses to fulfill a
# package's requirements on the Kotlin feature release version.

# If a versioned Kotlin executable like kotlinc1.5 is called, then extract the
# feature release version string from the executable's name, and override
# GENTOO_KOTLIN_VER setting to use that version.

exec_ver="$(grep --color=never -o "[0-9]\+.[0-9]\+$" <<< "${tool}")"
if [[ -n "${exec_ver}" ]]; then
    GENTOO_KOTLIN_VER="${exec_ver}"
    tool="${tool%${exec_ver}}"
fi

if [[ -n "${GENTOO_KOTLIN_VER}" ]]; then
    kotlin_path="$(readlink "${PREF_SYSTEM_ROOT}/${GENTOO_KOTLIN_VER}")"
    error_msg=" * Invalid value for GENTOO_KOTLIN_VER: ${GENTOO_KOTLIN_VER}\n"
    error_msg+=" * Could not find Kotlin at ${kotlin_path}"
else
    # First try to use the feature release chosen in user settings
    user_symlink="${HOME}/.gentoo@EPREFIX@/kotlin/home"
    if [[ -L "${user_symlink}" ]]; then
        kotlin_path="$(readlink "${user_symlink}")"
        error_msg=" * Invalid user Kotlin home: ${kotlin_path}"
    else
        # Fall back to the global feature release chosen for the system
        kotlin_path="$(readlink "${PREF_SYSTEM_ROOT}/system")"
        error_msg=" * Invalid system Kotlin home: ${kotlin_path}"
    fi
fi

tool_path="$(
    unset PATH
    PATH="${kotlin_path}/bin"
    command -v "${tool}" 2> /dev/null
)"

if [[ -x "${tool_path}" ]]; then
    exec "${tool_path}" "$@"
else
    # Exit codes follow https://www.freebsd.org/cgi/man.cgi?query=sysexits
    if [[ ! -d "${kotlin_path}" ]]; then
        echo -e "${error_msg}" >&2
        exit 78
    else
        if [[ "${tool}" == "run-kotlin-tool.sh" ]]; then
            echo " * run-kotlin-tool.sh cannot be called directly" >&2
            echo " * Please use the Kotlin executables instead" >&2
            exit 64
        else
            echo " * ${tool} is not available in ${kotlin_path}/bin" >&2
            exit 69
        fi
    fi
fi