#!/bin/bash

# This script downloads a specific release of PCRE2, extracts it and copies
# the necessary files to $dest. The actual compilation of PCRE2 happens in
# build.rs. Note that a new release of PCRE2 may require more changes than
# simply updating the version. Namely, we exhaustively enumerate the files that
# need to be copied below. This way, we only vendor into source control what is
# actually necessary for building PCRE2.

pcre2_sys_dir="$(dirname "$0")"
cd "$pcre2_sys_dir"

dest="upstream"
version="10.43"
dir="pcre2-$version"
archive="$dir.tar.gz"
url="https://github.com/PCRE2Project/pcre2/releases/download/pcre2-$version/$archive"
work="tmp/updates/pcre2-$version"

mkdir -p "$work"
curl -L "$url" > "$work/$archive"
(cd "$work" && tar xf "$archive")

upstream="$work/$dir"
rm -rf "$dest"/{src,include}
mkdir -p "$dest"/{src,include}

needed=(
  pcre2_auto_possess.c
  pcre2_chkdint.c
  pcre2_compile.c
  pcre2_config.c
  pcre2_context.c
  pcre2_convert.c
  pcre2_dfa_match.c
  pcre2_error.c
  pcre2_extuni.c
  pcre2_find_bracket.c
  pcre2_jit_compile.c
  pcre2_jit_match.c
  pcre2_jit_misc.c
  pcre2_maketables.c
  pcre2_match.c
  pcre2_match_data.c
  pcre2_newline.c
  pcre2_ord2utf.c
  pcre2_pattern_info.c
  pcre2_script_run.c
  pcre2_serialize.c
  pcre2_string_utils.c
  pcre2_study.c
  pcre2_substitute.c
  pcre2_substring.c
  pcre2_tables.c
  pcre2_ucd.c
  pcre2_ucptables.c
  pcre2_valid_utf.c
  pcre2_xclass.c

  pcre2_internal.h
  pcre2_intmodedep.h
  pcre2_jit_neon_inc.h
  pcre2_jit_simd_inc.h
  pcre2posix.h
  pcre2_ucp.h
)
for name in "${needed[@]}"; do
  cp "$upstream/src/$name" "$dest/src/"
done
cp "$upstream/src/pcre2_chartables.c.dist" "$dest/src/pcre2_chartables.c"
cp -a "$upstream/src/sljit" "$dest/src/"
cp "$upstream/src/config.h.generic" "$dest/include/config.h"
cp "$upstream/src/pcre2.h.generic" "$dest/include/pcre2.h"