init

build.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+# Builds the sing-vis WebAssembly engine and stages the static site under web/.
+# After this runs, web/ is fully self-contained and can be served by any static
+# file server (including GitHub Pages) — there is no backend.
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+# The engine's Go dependencies (sing) contain three source files that reference
+# golang.org/x/sys/unix, which has no equivalent for GOARCH=wasm. wasmbuild/
+# supplies wasm-safe stubs and gen-overlay.sh maps them in via `go build
+# -overlay`. Only this wasm build uses the overlay; native builds/tests do not.
+overlay="$(mktemp)"
+trap 'rm -f "$overlay"' EXIT
+bash wasmbuild/gen-overlay.sh > "$overlay"
+
+echo "building web/singvis.wasm (GOOS=js GOARCH=wasm)…"
+GOOS=js GOARCH=wasm go build -overlay "$overlay" -trimpath -ldflags="-s -w" \
+	-o web/singvis.wasm ./cmd/wasm
+
+# Ship the Go runtime's JS support shim next to the wasm. Newer Go keeps it under
+# lib/wasm; older layouts use misc/wasm.
+goroot="$(go env GOROOT)"
+if [ -f "$goroot/lib/wasm/wasm_exec.js" ]; then
+	cp "$goroot/lib/wasm/wasm_exec.js" web/wasm_exec.js
+elif [ -f "$goroot/misc/wasm/wasm_exec.js" ]; then
+	cp "$goroot/misc/wasm/wasm_exec.js" web/wasm_exec.js
+else
+	echo "error: wasm_exec.js not found under $goroot" >&2
+	exit 1
+fi
+
+# Pre-compress for static hosts that serve .gz when present (the wasm is large;
+# gzip roughly quarters it).
+if command -v gzip >/dev/null 2>&1; then
+	gzip -9 -f -k web/singvis.wasm
+fi
+
+size="$(du -h web/singvis.wasm | cut -f1)"
+gzsize="$( [ -f web/singvis.wasm.gz ] && du -h web/singvis.wasm.gz | cut -f1 || echo n/a )"
+echo "done. web/singvis.wasm=$size (gz=$gzsize), web/wasm_exec.js copied."
+echo "serve the web/ directory statically, e.g.:  ./run.sh"