Rename app to radiantwave: embed and provision assets, drop proclamations

internal/assets/assets.go

@@ -0,0 +1,50 @@
+// Package assets provisions the static assets bundled into the binary
+// (fonts, shaders, and terms-of-service pages) into a per-user assets
+// directory at application startup.
+package assets
+
+import (
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+)
+
+// Provision copies every file from the embedded filesystem into destDir,
+// preserving the relative directory structure. Existing files are
+// overwritten so the deployed assets always match the running binary.
+func Provision(bundled fs.FS, destDir string) error {
+	return fs.WalkDir(bundled, ".", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
+
+		src, err := bundled.Open(path)
+		if err != nil {
+			return fmt.Errorf("opening bundled asset %s: %w", path, err)
+		}
+		defer src.Close()
+
+		dst := filepath.Join(destDir, filepath.FromSlash(path))
+		if err := os.MkdirAll(filepath.Dir(dst), 0755); err != nil {
+			return fmt.Errorf("creating asset directory for %s: %w", path, err)
+		}
+
+		out, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+		if err != nil {
+			return fmt.Errorf("creating asset file %s: %w", dst, err)
+		}
+		if _, err := io.Copy(out, src); err != nil {
+			out.Close()
+			return fmt.Errorf("writing asset file %s: %w", dst, err)
+		}
+		if err := out.Close(); err != nil {
+			return fmt.Errorf("closing asset file %s: %w", dst, err)
+		}
+		return nil
+	})
+}