shithub: hugo

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commands: Support config from ENV

So

```bash
env HUGO_TITLE="Some Title" hugo server
```

Will change the `title`.

Fixes #2090

--- a/commands/hugo.go

+++ b/commands/hugo.go

@@ -17,7 +17,6 @@

 import (

 	"fmt"

-	"github.com/spf13/hugo/hugofs"

 	"io/ioutil"

 	"net/http"

 	"os"

@@ -27,6 +26,8 @@

 	"sync"

 	"time"

+	"github.com/spf13/hugo/hugofs"

+

 	"github.com/spf13/hugo/parser"

 	flag "github.com/spf13/pflag"

@@ -318,6 +319,8 @@

 // A Hugo command that calls initCoreCommonFlags() can pass itself

 // as an argument to have its command-line flags processed here.

 func InitializeConfig(subCmdVs ...*cobra.Command) error {

+	viper.AutomaticEnv()

+	viper.SetEnvPrefix("hugo")

 	viper.SetConfigFile(cfgFile)

 	// See https://github.com/spf13/viper/issues/73#issuecomment-126970794

 	if source == "" {