#!/bin/sh

_echo() {
    printf %s\\n "$*"
}

fatal() {
    _echo "$*" >&2
    exit 1
}

main() {
    if [ -z "${TMUX}" ]; then
        fatal "No TMUX variable detected in the environment"
    fi

    readonly PATH_DIR_TMP=$(mktemp -d)
    readonly PATH_FIFO_IN="${PATH_DIR_TMP}/in"
    readonly PATH_FIFO_OUT="${PATH_DIR_TMP}/out"
    readonly PATH_FIFO_RET="${PATH_DIR_TMP}/ret"

    if [ -z "${PATH_DIR_TMP}" ]; then
        fatal "Unable to create a temporary directory"
    fi

    mkfifo "${PATH_FIFO_IN}" "${PATH_FIFO_OUT}" "${PATH_FIFO_RET}"

    export TMUX=$(_echo "${TMUX}" | cut -d , -f 1,2)
    eval "tmux \
        set-window-option synchronize-panes off \\; \
        set-window-option remain-on-exit off \\; \
        split-window \"fzy $* < '${PATH_FIFO_IN}' > '${PATH_FIFO_OUT}' 2>&1; echo $? > '${PATH_FIFO_RET}'\""

    cat <&0 > "${PATH_FIFO_IN}" &
    cat < "${PATH_FIFO_OUT}"

    readonly CODE_RET=$(head -n 1 "${PATH_FIFO_RET}")

    rm -rf "${PATH_DIR_TMP}"

    exit "${CODE_RET}"
}

main "$@"