Print error when /index.html is zero-length

Also print warning (in verbose mode) for other empty pages.

See #947

diff --git a/hugolib/site.go b/hugolib/site.go
index 163ed183bbef586292f2600118dfcd1a8313e59f..a8f0599bb8396c1a4978a51cf2c4c6ecfb5ab9f1 100644 (file)
--- a/hugolib/site.go
+++ b/hugolib/site.go
@@ -1478,6 +1478,20 @@ func (s *Site) renderAndWritePage(name string, dest string, d interface{}, layou
        transformer := transform.NewChain(transformLinks...)
        transformer.Apply(outBuffer, renderBuffer, path)
 
+       if outBuffer.Len() == 0 {
+               jww.WARN.Printf("%q is rendered empty\n", dest)
+               if dest == "/" {
+                       jww.ERROR.Println("=============================================================")
+                       jww.ERROR.Println("Your rendered home page is blank: /index.html is zero-length")
+                       jww.ERROR.Println(" * Did you specify a theme on the command-line or in your")
+                       jww.ERROR.Printf("   %q file?  (Current theme: %q)\n", filepath.Base(viper.ConfigFileUsed()), viper.GetString("Theme"))
+                       if !viper.GetBool("Verbose") {
+                               jww.ERROR.Println(" * For more debugging information, run \"hugo -v\"")
+                       }
+                       jww.ERROR.Println("=============================================================")
+               }
+       }
+
        if err == nil {
                if err = s.WriteDestPage(dest, outBuffer); err != nil {
                        return err