chooser

#!/usr/bin/env bash
: ${GUI_CHOOSER:=true}
: ${NUM_LINES:=25}
: ${CHOOSER_PROMPT:=Choose an entry}
: ${CHOOSER_SEARCH:=}

joinArray() {
    IFS=$'\n'; echo "$*"
}

if [[ -z ${CHOOSER} ]]
then
    if [[ -z ${SSH_CONNECTION} && "${GUI_CHOOSER}" == "true" ]]
    then
        # GUI can be used
        if [[ "$(uname)" == "Darwin" ]]
        then
            type -a choose &>/dev/null && CHOOSER=choose
        else
            type -a bemenu &>/dev/null && CHOOSER=bemenu
        fi
    fi

    [[ -z ${CHOOSER} ]] && type -a fzf &>/dev/null && CHOOSER=fzf
    [[ -z ${CHOOSER} ]] && type -a bemenu &>/dev/null && CHOOSER=bemenu && export BEMENU_BACKEND=curses
fi

case "${CHOOSER}" in
    choose)
        joinArray "${@}" | choose -n ${NUM_LINES}
    ;;
    bemenu)
        joinArray "${@}" | bemenu -l ${NUM_LINES} --fn "DejaVu Sans Mono 20" --ifne -p "${CHOOSER_PROMPT}: " -P ">" -b -i
    ;;
    fzf)
        joinArray "${@}" | fzf --header="${CHOOSER_PROMPT}" +m --cycle -1 -0 --height=${NUM_LINES} -i -q "${CHOOSER_SEARCH}"
    ;;
    *)
        # Default
        PS3="${CHOOSER_PROMPT}: "
        select entry in "${@}"; do
            if [[ " ${*} " == *" ${entry} "* ]]
            then
                echo "${entry}"
                break
            fi
        done
    ;;
esac