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commands: Deprecate CLI flags canonifyURLs, pluralizeListTitles, preserveTaxonomyNames, uglyURLs

You can of course still set them in site config.

Fixes #4347

--- a/commands/hugo.go

+++ b/commands/hugo.go

@@ -509,8 +509,21 @@

 }

+var deprecatedFlags = map[string]bool{

+	strings.ToLower("uglyURLs"):              true,

+	strings.ToLower("pluralizeListTitles"):   true,

+	strings.ToLower("preserveTaxonomyNames"): true,

+	strings.ToLower("canonifyURLs"):          true,

+}

+

 func (c *commandeer) setValueFromFlag(flags *flag.FlagSet, key string) {

 	if flags.Changed(key) {

+		if _, deprecated := deprecatedFlags[strings.ToLower(key)]; deprecated {

+			msg := fmt.Sprintf(`Set "%s = true" in your config.toml.

+If you need to set this configuration value from the command line, set it via an OS environment variable: "HUGO_%s=true hugo"`, key, strings.ToUpper(key))

+			// Remove in Hugo 0.37

+			helpers.Deprecated("hugo", "--"+key+" flag", msg, false)

+		}

 		f := flags.Lookup(key)

 		c.Set(key, f.Value.String())

 	}