#!/bin/bash
# A simple tool for Gophermap fragment generation from existing file/directory lists
# Depends on file external command to determine the type
#
# Usage: find [root] [params] | list2map.sh 
#
# Created by Luxferre in 2023, released into public domain

shopt -s extglob # enable extended pattern matching (just to be sure)

RDIR="$1" # root directory, no substitution if empty
THOST="$2" # can be empty per spec
TPORT="$3" # can be empty too
INDEXFILE='index.map' # the basename to consider an index file

typequery() { # external command wrapper to fetch the file's MIME type
  local res="$(file -Nn --mime-type "$1")"
  printf '%s' "${res##*: }"
}

while read -rs fpath; do # fully line-based operation
  ftype="$(typequery "$fpath")" # MIME type here
  bname="${fpath##*/}" # basename here
  desc="$bname" # default to the basename
  [[ "$bname" == "$INDEXFILE" ]] && continue # skip index map
  etype=9 # default map entry type is binary until proven otherwise
  esel="${fpath##$RDIR}" # if RDIR is empty, they are the same
  if [[ "$ftype" == 'inode/directory' ]]; then # it's a directory
    etype=1
    esel="${esel}/${INDEXFILE}" # update the selector
  elif [[ "${ftype%%/*}" == 'text' ]]; then # update etype for text files
    etype=0
    read -rsd$'\r' desc < "$fpath" # read the first file line as the description/title
    desc="${desc##*([[:blank:]])}" # remove leading whitespace
    desc="${desc%%*([[:blank:]])}" # remove trailing whitespace
  fi
  # output the RFC-compliant Gophermap line
  printf '%s%s\t%s\t%s\t%s\r\n' "$etype" "$desc" "$esel" "$THOST" "$TPORT" 
done