build: replace postbuild-cpp.js with bash script

parser/Makefile.toml

@@ -39,12 +39,11 @@
     "cargo build -Z unstable-options --target ${TARGET} ${CARGO_OPTIONS} --artifact-dir target/cpp/${CONFIGURATION}",
     "cp target/cpp/${CONFIGURATION}/libmilo_parser.a ../dist/cpp/${CONFIGURATION}/libmilo.a",
     "cp target/headers/milo.h ../dist/cpp/${CONFIGURATION}",
-    "node ../scripts/postbuild-cpp.js	${CONFIGURATION}",
   ]
 
 [tasks."cpp:headers"]
-  command = "cbindgen"
-  args    = ["--quiet", "--output", "target/headers/milo.h"]
+  command = "bash"
+  args    = ["../scripts/postbuild-cpp.sh", "target/headers/milo.h"]
 
 [tasks."wasm:release"]
   env      = { CONFIGURATION = "release", CARGO_BUILD_OPTIONS = "-Z unstable-options -Z build-std=std,panic_abort", CARGO_OPTIONS = "--release", RUSTFLAGS_BASE = "-Z unstable-options -C panic=immediate-abort", WASMPACK_OPTIONS = "--release" }

scripts/postbuild-cpp.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [ $# -lt 1 ]; then
+  echo "Usage: postbuild-cpp.sh <output-header-path>" >&2
+  exit 1
+fi
+
+OUTPUT_FILE="$1"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+mkdir -p "$(dirname "$OUTPUT_FILE")"
+TMPFILE=$(mktemp)
+trap 'rm -f "$TMPFILE"' EXIT
+
+# Run cbindgen from the parser directory so cargo finds its vendored config.
+# RUSTC_BOOTSTRAP=1 allows stable rustc to accept -Zunpretty=expanded, which
+# cbindgen needs for [parse.expand] to resolve proc-macro-generated types.
+(cd "$ROOT_DIR/parser" && RUSTC_BOOTSTRAP=1 cbindgen --quiet --output "$TMPFILE")
+
+# Extract version from parser/Cargo.toml
+VERSION=$(grep -m1 '^\s*version\s*=' "$ROOT_DIR/parser/Cargo.toml" | sed 's/.*"\([^"]*\)".*/\1/')
+if [ -z "$VERSION" ]; then
+  echo "Error: Cannot find parser version in parser/Cargo.toml" >&2
+  exit 1
+fi
+
+# Parse semver components
+MAJOR="${VERSION%%.*}"
+REST="${VERSION#*.}"
+MINOR="${REST%%.*}"
+REST="${REST#*.}"
+if [[ "$REST" == *-* ]]; then
+  PATCH="${REST%%-*}"
+  PRERELEASE="${REST#*-}"
+else
+  PATCH="$REST"
+  PRERELEASE=""
+fi
+
+# Read methods from YAML (skip comments, blank lines, and document start marker)
+mapfile -t METHODS < <(grep '^- ' "$ROOT_DIR/macros/constants/methods.yml" | sed 's/^- //' | tr '-' '_')
+
+# Build the replacement block
+REPLACEMENT=$(
+  printf '#define MILO_VERSION "%s"\n' "$VERSION"
+  printf '#define MILO_VERSION_MAJOR %s\n' "$MAJOR"
+  printf '#define MILO_VERSION_MINOR %s\n' "$MINOR"
+  printf '#define MILO_VERSION_PATCH %s\n' "$PATCH"
+  printf '#define MILO_VERSION_PRERELEASE "%s"\n' "$PRERELEASE"
+  printf '\n'
+  printf '#define MILO_METHODS_MAP(EACH) \\\\\n'
+  for i in "${!METHODS[@]}"; do
+    printf '  EACH(%d, %s, %s) \\\\\n' "$i" "${METHODS[$i]}" "${METHODS[$i]}"
+  done
+  printf '\n'
+  printf 'namespace milo_parser {\n'
+  printf '\n'
+  printf 'struct Parser;'
+)
+
+# Replace "namespace milo_parser {" with the preamble, then collapse 3+ blank lines to 1
+awk -v replacement="$REPLACEMENT" '
+  /^namespace milo_parser \{$/ && !replaced {
+    print replacement
+    replaced = 1
+    next
+  }
+  { print }
+' "$TMPFILE" \
+| awk '/^$/ { blank++; if (blank <= 1) print; next } { blank = 0; print }' \
+> "$OUTPUT_FILE"