#! /usr/bin/env bash
# Editor for nightfall.city
# samhunter@rawtext.club
# Syntax:
# ./nexedit <shore-url>
# for example:
# ./nexedit shore/samhunter/foo.bar
#

# Check based on oberon's suggestion in classifieds
# Create a file with unique content then read it back
check() {
  local -i rc=1 # only good if write successful
  local tag="${RANDOM}-${RANDOM}-${RANDOM}"
  local tagfile="shore/samhunter/tag"
  printf "%s\n%s\n%s\n.\n" \
    "${tagfile}" \
    "$(cat nightfall-city.id)" \
    "$tag" | nc -w 10 nightfall.city 1915
  ret="$(printf "%s\r\n" "${tagfile}" | nc nightfall.city 1900)"
  [[ "$tag" == "$ret" ]] && rc=0
  return $rc
}

# Check whether nightfall.city is read-only or not
check || { printf "Tagfile is read-only.\n" >&2 ; exit 1; }

# Try to read the existing file
readonly PAT='.*not found'
if [[ -n "$1" ]]; then
  nexfile="$1"
else
  exit 1
fi
editfile=$(mktemp "/tmp/nexedit.XXXXXXX.nex")
trap "rm -f ${editfile}" EXIT
mapfile -t DATA < <(printf "%s\r\n" "${nexfile}" | nc nightfall.city 1900)

# Open empty if nothing retrieved, otherwise load the current state
[[ "${DATA[0]}" =~ $PAT ]] \
  || printf "%s\n" "${DATA[@]}" > "${editfile}"
${EDITOR:-vim} "${editfile}"

# Last chance save - in case N.C started rejecting writes while we
# were editing
check || cp "${editfile}" "${nexfile//\//_}.bak"

# Upload
printf "%s\n%s\n%s\n.\n" \
  "${nexfile}" \
  "$(cat nightfall-city.id)" \
  "$(cat ${editfile})" | nc -w 10 nightfall.city 1915

# vim: ts=2 sw=2 expandtab ft=bash :