markdown: Make base path optional, always generate links

The base path being optional in the Caddyfile is convenient when you just want the whole site to be markdown-enabled. The other change is to always generate links... this is because an index page for markdown files may not be statically generated, but it should still show links. Commit 09341fc was a regression, and this fixes it.

middleware/markdown/generator.go

@@ -17,22 +17,24 @@ import (
 // It only generates static files if it is enabled (cfg.StaticDir
 // must be set).
 func GenerateStatic(md Markdown, cfg *Config) error {
-	// If static site generation is enabled.
+	// Generate links since they may be needed, even without sitegen.
+	generated, err := generateLinks(md, cfg)
+	if err != nil {
+		return err
+	}
+
+	// No new file changes, return.
+	if !generated {
+		return nil
+	}
+
+	// If static site generation is enabled, generate the site.
 	if cfg.StaticDir != "" {
-		generated, err := generateLinks(md, cfg)
-		if err != nil {
-			return err
-		}
-
-		// No new file changes, return.
-		if !generated {
-			return nil
-		}
-
 		if err := generateStaticHTML(md, cfg); err != nil {
 			return err
 		}
 	}
+
 	return nil
 }