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#!/usr/bin/env bash
# Build nvim.wasm
set -euo pipefail
ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
OUTDIR="$ROOT/build-wasm"
source "$ROOT/.emsdk/emsdk_env.sh"
mkdir -p "$OUTDIR"
if ! command -v emcc >/dev/null 2>&1; then
echo "ERROR: emcc not found"
exit 1
fi
if ! command -v zig >/dev/null 2>&1; then
echo "ERROR: zig not found"
exit 1
fi
emcc --version
zig version
# Install Binaryen if it is not already available.
BINARYEN_VERSION=132
BINARYEN_DIR="$ROOT/.binaryen"
BINARYEN_BIN="$BINARYEN_DIR/binaryen-version_${BINARYEN_VERSION}/bin"
if [ ! -x "$BINARYEN_BIN/wasm-opt" ]; then
echo "Installing Binaryen ${BINARYEN_VERSION}..."
mkdir -p "$BINARYEN_DIR"
curl -L \
"https://github.com/WebAssembly/binaryen/releases/download/version_${BINARYEN_VERSION}/binaryen-version_${BINARYEN_VERSION}-x86_64-linux.tar.gz" \
-o /tmp/binaryen.tar.gz
tar -xf /tmp/binaryen.tar.gz -C "$BINARYEN_DIR"
fi
export PATH="$BINARYEN_BIN:$PATH"
wasm-opt --version
zig build nvim_bin \
-Dtarget=wasm32-emscripten \
-Dcpu=generic+atomics+bulk_memory+mutable_globals \
-Demscripten-sysroot="$EMSDK/upstream/emscripten/cache/sysroot" \
-Doptimize=ReleaseSmall
ZIG_OUT="$ROOT/zig-out/bin"
# Optimize the final WASM artifact with Binaryen.
wasm-opt -Oz -o "$ZIG_OUT/nvim.wasm" "$ZIG_OUT/nvim.wasm"
required=(
nvim.wasm
nvim.js
nvim.data
)
missing=()
for name in "${required[@]}"; do
if [ -f "$ZIG_OUT/$name" ]; then
cp "$ZIG_OUT/$name" "$OUTDIR/$name"
else
missing+=("$name")
fi
done
if [ "${#missing[@]}" -ne 0 ]; then
echo "ERROR: Missing required WASM artifacts: ${missing[*]}"
ls -la "$ZIG_OUT" || true
exit 2
fi
echo "build-wasm.sh finished successfully."
if [ "${BUNDLE_WASM:-0}" = "1" ]; then
BUNDLE_DIR="$ROOT/bundle-wasm"
ZIP_PATH="$ROOT/nvim-wasm-emscripten.zip"
rm -rf "$BUNDLE_DIR" "$ZIP_PATH"
mkdir -p "$BUNDLE_DIR"
cp "$OUTDIR"/nvim.wasm "$OUTDIR"/nvim.js "$OUTDIR"/nvim.data "$BUNDLE_DIR"/
cp "$ROOT"/src/wasm/*.py "$ROOT"/src/wasm/*.html "$ROOT"/src/wasm/*.js "$ROOT"/src/wasm/*.css "$BUNDLE_DIR"/
# Rewrite repo relative paths for the flat bundle layout
sed -i 's#\.\./\.\./zig-out/bin/#./#g' "$BUNDLE_DIR/nvim-worker.js"
sed -i 's#Path(__file__)\.resolve()\.parents\[2\]#Path(__file__).resolve().parent#' "$BUNDLE_DIR/serve.py"
( cd "$BUNDLE_DIR" && zip -r "$ZIP_PATH" . )
rm -rf "$BUNDLE_DIR"
echo "Created $ZIP_PATH"
fi
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