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hugolib: Add option to disable rendering of 404 page

Fixes #1889
Closes #2037

--- a/commands/hugo.go

+++ b/commands/hugo.go

@@ -127,6 +127,7 @@

 	canonifyURLs          bool

 	cleanDestination      bool

 	enableRobotsTXT       bool

+	disable404            bool

 	disableRSS            bool

 	disableSitemap        bool

 	draft                 bool

@@ -214,6 +215,7 @@

 	cmd.Flags().BoolVar(&cleanDestination, "cleanDestinationDir", false, "Remove files from destination not found in static directories")

 	cmd.Flags().BoolVarP(&draft, "buildDrafts", "D", false, "include content marked as draft")

 	cmd.Flags().BoolVarP(&future, "buildFuture", "F", false, "include content with publishdate in the future")

+	cmd.Flags().BoolVar(&disable404, "disable404", false, "Do not render 404 page")

 	cmd.Flags().BoolVar(&disableRSS, "disableRSS", false, "Do not build RSS files")

 	cmd.Flags().BoolVar(&disableSitemap, "disableSitemap", false, "Do not build Sitemap file")

 	cmd.Flags().StringVarP(&source, "source", "s", "", "filesystem path to read files relative from")

@@ -266,6 +268,7 @@

 	viper.SetDefault("cleanDestinationDir", false)

 	viper.SetDefault("Watch", false)

 	viper.SetDefault("MetaDataFormat", "toml")

+	viper.SetDefault("Disable404", false)

 	viper.SetDefault("DisableRSS", false)

 	viper.SetDefault("DisableSitemap", false)

 	viper.SetDefault("DisableRobotsTXT", false)

@@ -356,6 +359,9 @@

 		}

 		if flagChanged(cmdV.Flags(), "canonifyURLs") {

 			viper.Set("CanonifyURLs", canonifyURLs)

+		}

+		if flagChanged(cmdV.Flags(), "disable404") {

+			viper.Set("Disable404", disable404)

 		}

 		if flagChanged(cmdV.Flags(), "disableRSS") {

 			viper.Set("DisableRSS", disableRSS)

--- a/docs/content/overview/configuration.md

+++ b/docs/content/overview/configuration.md

@@ -96,7 +96,9 @@

     # Do not build Sitemap file

     disableSitemap:             false

     # Build robots.txt file

-    enableRobotsTXT:           false

+    enableRobotsTXT:            false

+    # Do not render 404 page

+    disable404:                 false

     # edit new content with this editor, if provided

     editor:                     ""

     # Enable Emoji emoticons support for page content.

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -1769,6 +1769,10 @@

 		}

 	}

+	if viper.GetBool("Disable404") {

+		return nil

+	}

+

 	// TODO(bep) reusing the Home Node smells trouble

 	n.URL = helpers.URLize("404.html")

 	n.IsHome = false