Fix Viperized .Site.Params

git bisect identified 62dd1d4 as the breaking commit; when
github.com/spf13/viper was introduced, the Params field was always
empty.

Given a map in YAML in Viper, the return type is
`map[interface{}]interface{}`, _not_ `map[string]interface{}`, even if
`.SetDefault()` has been called with an item of
`map[string]interface{}{}` so the cast assertion on the `.Get("Params")`
always failed.

diff --git a/hugolib/site.go b/hugolib/site.go
index 8948a1b29f0157e20f8a6fb91160da3762c152db..26185142e8493d7493164655dac396938429c2dc 100644 (file)
--- a/hugolib/site.go
+++ b/hugolib/site.go
@@ -260,9 +260,17 @@ func (s *Site) initialize() (err error) {
 }
 
 func (s *Site) initializeSiteInfo() {
-       params, ok := viper.Get("Params").(map[string]interface{})
+       paramsV, ok := viper.Get("Params").(map[interface{}]interface{})
+       // Warning: viper.Get(map_item) returns map[interface{}]interface{}
+       // even if .SetDefault called with a map[string]interface{}
        if !ok {
-               params = make(map[string]interface{})
+               paramsV = make(map[interface{}]interface{})
+       }
+       params := make(map[string]interface{}, len(paramsV))
+       for k, v := range paramsV {
+               if s, ok := k.(string); ok {
+                       params[s] = v
+               }
        }
 
        permalinks := make(PermalinkOverrides)