WIP Redesign

assets.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"html/template"
+	"io/fs"
+	"os"
+	"sync"
+)
+
+var devMode bool
+
+// assetFS defaults to the embedded FS so package-level initializers (e.g. icon
+// vars in render.go) can read assets before main() runs. initAssets() swaps it
+// for os.DirFS when -dev is set.
+var assetFS fs.FS = assets
+
+func initAssets(dev bool) {
+	devMode = dev
+	if dev {
+		assetFS = os.DirFS(".")
+	}
+}
+
+// readAsset reads a file from the asset FS (embedded in prod, live disk in dev).
+func readAsset(path string) ([]byte, error) {
+	return fs.ReadFile(assetFS, path)
+}
+
+// tmplLoader holds a lazily-parsed template. In dev mode it re-parses on every
+// get() call so HTML changes are visible without recompiling.
+type tmplLoader struct {
+	name     string
+	patterns []string
+	once     sync.Once
+	t        *template.Template
+}
+
+// newTemplate creates a tmplLoader. name is the root template name passed to
+// template.New; patterns are the glob/path arguments forwarded to ParseFS.
+func newTemplate(name string, patterns ...string) *tmplLoader {
+	return &tmplLoader{name: name, patterns: patterns}
+}
+
+func (l *tmplLoader) get() *template.Template {
+	if devMode {
+		return template.Must(template.New(l.name).ParseFS(assetFS, l.patterns...))
+	}
+	l.once.Do(func() {
+		l.t = template.Must(template.New(l.name).ParseFS(assetFS, l.patterns...))
+	})
+	return l.t
+}