#!/usr/bin/env sh
# Generates src/core/version.h from CORE_BASE_VERSION pinned in
# Makefile + the current short git rev.  Called by:
#   - The project Makefile at parse time via $(shell ...) (gated to
#     skip read-only goals like clean / print-* / lint).
#   - jni/Android.mk via $(shell ...) so ndk-build picks it up.
#   - scripts/c89-lint.sh, scripts/install-hooks.sh's pre-commit, and
#     the c-cpp.yml msvc-check step (which invokes cl.exe directly).
#
# Output is gitignored.  Re-runs are content-aware: if the new
# contents match the existing file, the mtime is left alone so
# incremental builds don't needlessly rebuild libretro.o.
#
# POSIX sh compatible -- no bashisms.

set -e

ROOT=$(cd "$(dirname "$0")/.." && pwd)
OUT="$ROOT/src/core/version.h"

# Portable sed extraction that works on both GNU and BSD sed.
CORE_BASE_VERSION=$(sed -n 's/^CORE_BASE_VERSION[[:space:]]*:*=[[:space:]]*\(.*\)/\1/p' "$ROOT/Makefile" | head -1)
if [ -z "$CORE_BASE_VERSION" ]; then
  echo "gen-version-h.sh: failed to read CORE_BASE_VERSION from Makefile" >&2
  exit 1
fi

# Short rev + "-dirty" when tracked files are modified (see build-id.sh).
# Content-aware output below keeps incremental builds cheap: the file is
# only rewritten when the rev or dirty state actually changes.
# The harness build-identity guard compares VJ_EXPECT_BUILD against this
# string, so both sides must agree on the dirty suffix.
GIT_REV=$("$ROOT/scripts/build-id.sh")

mkdir -p "$(dirname "$OUT")"
TMP="$OUT.tmp"
cat > "$TMP" << EOF
/* Auto-generated by scripts/gen-version-h.sh.  Do not edit; do not commit. */
#ifndef VJAG_VERSION_H
#define VJAG_VERSION_H
#define CORE_BASE_VERSION "${CORE_BASE_VERSION}"
#define GIT_VERSION " ${GIT_REV}"
#ifdef BUILD_TIMESTAMP
#define CORE_VERSION CORE_BASE_VERSION GIT_VERSION " " BUILD_TIMESTAMP
#else
#define CORE_VERSION CORE_BASE_VERSION GIT_VERSION
#endif
#endif
EOF

if cmp -s "$TMP" "$OUT" 2>/dev/null; then
  rm "$TMP"
else
  mv "$TMP" "$OUT"
fi