Make wasm dev work!

Author: bobsingor

packages/pdf-runtime/package.json

@@ -51,9 +51,6 @@
     "generate:runtime-methods": "node ./build/generate-runtime-methods.mjs",
     "lint": "eslint src --color",
     "lint:fix": "eslint src --color --fix",
-    "runtime:build-local": "bash ./scripts/runtime-build-local.sh",
-    "runtime:package-local": "bash ./scripts/runtime-package-local.sh",
-    "runtime:sync": "bash ./scripts/runtime-sync.sh",
     "runtime:use-local": "bash ./scripts/runtime-use-local.sh",
     "test:parity": "node --test ./test/*.test.mjs",
     "verify:packages": "bash ./scripts/verify-packages.sh",
@@ -84,6 +81,7 @@
     "@rollup/plugin-typescript": "^12.3.0",
     "@types/emscripten": "^1.39.13",
     "@types/node": "latest",
+    "chokidar-cli": "^3.0.0",
     "cmake-js": "^7.3.1",
     "magic-string": "^0.30.17",
     "rollup": "^4.53.5",

packages/pdf-runtime/scripts/fetch-libpdfium.sh

@@ -48,7 +48,14 @@ ARCHIVE="$CACHE/libembedpdf-pdf-runtime-$TARGET.tar.gz"
 
 mkdir -p "$CACHE" "$DEST"
 
-if [[ ! -f "$ARCHIVE" ]]; then
+needs_refresh() {
+  [[ ! -f "$ARCHIVE" ]] && return 0
+  local cached_sha
+  cached_sha="$(sha256_file "$ARCHIVE")"
+  [[ "$cached_sha" != "$SHA256" ]]
+}
+
+if needs_refresh; then
   echo "Downloading $TARGET from $URL"
   if [[ "$URL" == file://* ]]; then
     LOCAL_PATH="${URL#file://}"

packages/pdf-runtime/scripts/runtime-build-local.sh

@@ -2,24 +2,89 @@
 set -euo pipefail
 
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+SCRIPT="$ROOT/scripts/wasm-dev.sh"
 SRC="$ROOT/runtime-src"
 TARGET="wasm32"
+EMSDK_VERSION="3.1.72"
+LOCK_DIR="$ROOT/.cache/wasm-dev"
+RUNNING="$LOCK_DIR/running"
+PENDING="$LOCK_DIR/pending"
+
+mkdir -p "$LOCK_DIR"
+
+if [[ ! -d "$SRC/.git" && ! -f "$SRC/.git" ]]; then
+  echo "runtime-src missing; run: git submodule update --init --recursive packages/pdf-runtime/runtime-src" >&2
+  exit 1
+fi
+
+for cmd in gn ninja gclient; do
+  if ! command -v "$cmd" >/dev/null 2>&1; then
+    echo "missing $cmd on PATH; install depot_tools and add it to PATH" >&2
+    echo "see: https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up" >&2
+    exit 1
+  fi
+done
+
+ensure_emsdk() {
+  local emsdk_dir="$SRC/third_party/emsdk"
+  if [[ ! -d "$emsdk_dir/.git" ]]; then
+    git clone https://github.com/emscripten-core/emsdk.git "$emsdk_dir"
+  fi
+  "$emsdk_dir/emsdk" install "$EMSDK_VERSION"
+  "$emsdk_dir/emsdk" activate "$EMSDK_VERSION"
+  # shellcheck disable=SC1091
+  source "$emsdk_dir/emsdk_env.sh"
+}
+
+case "$(uname -s)" in
+  Darwin) export PDF_RUNTIME_TARGET_OS_LIST="mac emscripten" ;;
+  Linux)  export PDF_RUNTIME_TARGET_OS_LIST="linux emscripten" ;;
+  *) echo "wasm:dev only supports Darwin or Linux hosts" >&2; exit 1 ;;
+esac
 
 build_once() {
-  "$ROOT/scripts/runtime-build-local.sh" "$TARGET"
+  ensure_emsdk
+  "$SRC/scripts/embedpdf-runtime/build-target.sh" "$TARGET"
   local artifact
-  artifact="$("$ROOT/scripts/runtime-package-local.sh" "$TARGET")"
+  artifact="$("$SRC/scripts/embedpdf-runtime/package-target.sh" "$TARGET" | tail -n1)"
   "$ROOT/scripts/runtime-use-local.sh" "$TARGET" "$artifact"
-  PDF_RUNTIME_BUILD_FILE="$ROOT/pdf-runtime-build.local.json" "$ROOT/scripts/build-target.sh" "$TARGET"
+  PDF_RUNTIME_BUILD_FILE="$ROOT/pdf-runtime-build.local.json" \
+    "$ROOT/scripts/build-target.sh" "$TARGET"
   echo "pdf-runtime wasm refreshed"
 }
 
-build_once
-
-if ! command -v watchexec >/dev/null 2>&1; then
-  echo "watchexec not found; ran one build and exiting"
+if [[ "${WASM_DEV_BUILD_ONCE:-}" == "1" ]]; then
+  if [[ -f "$RUNNING" ]]; then
+    touch "$PENDING"
+    echo "build already running; queued rebuild"
+    exit 0
+  fi
+  trap 'rm -f "$RUNNING"' EXIT
+  while :; do
+    touch "$RUNNING"
+    rm -f "$PENDING"
+    build_once
+    [[ -f "$PENDING" ]] || break
+    echo "rebuild requested while building; running again"
+  done
   exit 0
 fi
 
+CHOKIDAR_BIN="$ROOT/node_modules/.bin/chokidar"
+if [[ ! -x "$CHOKIDAR_BIN" ]]; then
+  echo "chokidar binary missing at $CHOKIDAR_BIN; run: pnpm install --filter @embedpdf/pdf-runtime" >&2
+  exit 1
+fi
+
 cd "$SRC"
-watchexec --exts cc,cpp,h --ignore 'third_party/**' --restart --shell bash -- "$(declare -f build_once); ROOT='$ROOT'; TARGET='$TARGET'; build_once"
+exec "$CHOKIDAR_BIN" \
+  "core/**/*.{cc,cpp,h}" \
+  "fpdfsdk/**/*.{cc,cpp,h}" \
+  "fxbarcode/**/*.{cc,cpp,h}" \
+  "fxjs/**/*.{cc,cpp,h}" \
+  "xfa/**/*.{cc,cpp,h}" \
+  "public/**/*.h" \
+  "constants/**/*.h" \
+  --initial \
+  --debounce 2000 \
+  -c "WASM_DEV_BUILD_ONCE=1 bash '$SCRIPT'"