commands: Enable format flag with hugo new site

Fixes #11155

commands/new.go

@@ -150,6 +150,7 @@ Use ` + "`hugo new [contentPath]`" + ` to create new content.`,
 				},
 				withc: func(cmd *cobra.Command, r *rootCommand) {
 					cmd.Flags().BoolVarP(&force, "force", "f", false, "init inside non-empty directory")
+					cmd.Flags().StringVar(&format, "format", "toml", "preferred file format (toml, yaml or json)")
 				},
 			},
 			&simpleCommand{

testscripts/commands/new.txt

@@ -2,6 +2,8 @@
 
 hugo new site -h
 stdout 'Create a new site in the provided directory'
+hugo new site my-yaml-site --format yml
+checkfile my-yaml-site/hugo.yml
 hugo new site mysite -f
 stdout 'Congratulations! Your new Hugo site is created in'
 cd mysite
@@ -45,6 +47,3 @@ draft: true
 ---
 
 Dummy content.
-
-
-