#!/bin/sh
# Copyright (c) 2023, 2024 Jonas 'Sortie' Termansen.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# tix-repository
# Generate repository metadata.

set -e

generation=3

unset repository

operand=1
dashdash=
previous_option=
for argument do
  if [ -n "$previous_option" ]; then
    eval $previous_option=\$argument
    previous_option=
    continue
  fi

  case $argument in
  *=?*) parameter=$(expr "X$argument" : '[^=]*=\(.*\)' || true) ;;
  *=)   parameter= ;;
  *)    parameter=yes ;;
  esac

  case $dashdash$argument in
  --) dashdash=yes ;;
  --generation=*) generation=$parameter ;;
  --generation) previous_option=generation ;;
  -*) echo "$0: unrecognized option $argument" >&2
      exit 1 ;;
  *)
    if [ $operand = 1 ]; then
      repository="$argument"
      operand=2
    else
      echo "$0: unexpected extra operand $argument" >&2
      exit 1
    fi
    ;;
  esac
done

if [ -n "$previous_option" ]; then
  echo "$0: option '$argument' requires an argument" >&2
  exit 1
fi

if [ -z "$repository" ]; then
  echo "$0: error: No repository was specified" >&2
  exit 1
fi

if [ "$generation" != 3 ]; then
  echo "$0: error: --generation=$generation is not supported by this version" >&2
  exit 1
fi

cd "$repository"

ls |
grep -E '\.tix.tar.xz$' |
grep -Eo '^[^.]*' |
LC_ALL=C sort -o packages.list

true > dependencies.list
true > renames.list
true > manifest.list

for package in $(cat packages.list); do
  tar -xOf "$package.tix.tar.xz" "tix/tixinfo/$package" > "$package.info"
  tar -xOf "$package.tix.tar.xz" "tix/manifest/$package" > "$package.manifest"
  sha256sum "$package.tix.tar.xz" > "$package.tix.tar.xz.sha256sum"
  tix-vars -d '' "$package.info" RENAMES | tr , '\n' | sed -E '/^$/d' >> renames.list
  (printf "%s: " "$package" && tix-vars -d '' "$package.info" RUNTIME_DEPS | sed -E 's/ +$//') >> dependencies.list
  sed -E "s/$/:$package/" "$package.manifest" >> manifest.list
done

LC_ALL=C sort -t: -k1,1 manifest.list -o manifest.list

find -type f '!' -name 'sha256sum' '!' -name '*.sha256sum' -exec sha256sum '{}' '+' |
sed -E 's,  \./,  ,' |
LC_ALL=C sort -k 2 > sha256sum