#!/usr/bin/bash
# fless - fuzzy find a file and run less on it
# Dependencies
# - fd (soft)
# - fzf

help() {
cat << EOF
Usage: fless [-h|--help] [-b|--boot] [-d|--dir directory] [-e|--etc]
Options:
    -b, --boot      edit a file in /boot/loader
    -d, --dir       edit a file in a given directory
    -e, --etc       edit a file in /etc
    -h, --help      print this help page
EOF
}

# Error messages
readonly directory_error="Error, enter a directory"

# Pre-run correctness checks
unset find_opts
ans=
file=
dir=

while true; do
    case "${1}" in
        '-b'|'--boot')
            dir="/boot/loader"
            shift
            continue
            ;;
        '-d'|'--dir')
            case "${2}" in
                "")
                    printf '%s\n' "${directory_error}" >&2
                    exit 1
                    ;;
                *)
                    dir="${2}"
                    [[ ! -d "${dir}" ]] && printf '%s\n' "Not a directory: ${dir}" >&2 && exit 1
                    ;;
            esac
            shift 2
            continue
            ;;
        --dir=*)
            dir="${1#*=}"
            [[ -z "${dir}" ]] && printf '%s\n' "${directory_error}" >&2 && exit 1
            [[ ! -d "${dir}" ]] && printf '%s\n' "Not a directory: ${dir}" >&2 && exit 1
            shift
            continue
            ;;
        '-e'|'--etc')
            dir='/etc'
            shift
            continue
            ;;
        '-h'|'--help')
            help
            exit
            ;;
        --)
            shift
            break
            ;;
        -*)
            printf '%s\n' "Unknown option: ${1}"
            exit 1
            ;;
        *)
            break
            ;;
    esac
done

declare -a find_opts
template_dir="${HOME}/Templates"

if [[ -x '/usr/bin/fd' ]]; then
    find_bin='/usr/bin/fd'
    find_opts+=('--print0')
    find_opts+=('--type' 'f')
else
    find_bin='/usr/bin/find'
    find_opts+=('-mindepth' '0')
    find_opts+=('-type' 'f')
    find_opts+=('-print0')
fi

if [[ "${dir}" ]]; then
    file="$("${find_bin}" "${find_opts[@]}" . -- "${dir}" | fzf --read0 --select-1 --exit-0 --no-mouse)"
else
    file="$("${find_bin}" "${find_opts[@]}" | fzf --read0 --select-1 --exit-0 --no-mouse)"
fi

[[ ! "${file}" ]] && exit 1

"${PAGER:-/usr/bin/less}" -- "${file}"