Add Hugo Modules

This commit implements Hugo Modules.

This is a broad subject, but some keywords include:

* A new `module` configuration section where you can import almost anything. You can configure both your own file mounts nd the file mounts of the modules you import. This is the new recommended way of configuring what you earlier put in `configDir`, `staticDir` etc. And it also allows you to mount folders in non-Hugo-projects, e.g. the `SCSS` folder in the Bootstrap GitHub project.
* A module consists of a set of mounts to the standard 7 component types in Hugo: `static`, `content`, `layouts`, `data`, `assets`, `i18n`, and `archetypes`. Yes, Theme Components can now include content, which should be very useful, especially in bigger multilingual projects.
* Modules not in your local file cache will be downloaded automatically and even "hot replaced" while the server is running.
* Hugo Modules supports and encourages semver versioned modules, and uses the minimal version selection algorithm to resolve versions.
* A new set of CLI commands are provided to manage all of this: `hugo mod init`,  `hugo mod get`,  `hugo mod graph`,  `hugo mod tidy`, and  `hugo mod vendor`.

All of the above is backed by Go Modules.

Fixes #5973
Fixes #5996
Fixes #6010
Fixes #5911
Fixes #5940
Fixes #6074
Fixes #6082
Fixes #6092

1 files changed, 10 insertions, 3 deletions

diff --git a/commands/commands.go b/commands/commands.go
index 51bfb4763..3096e1fe0 100644
--- a/commands/commands.go
+++ b/commands/commands.go
@@ -54,6 +54,7 @@ func (b *commandsBuilder) addAll() *commandsBuilder {
 		newImportCmd(),
 		newGenCmd(),
 		createReleaser(),
+		b.newModCmd(),
 	)
 
 	return b
@@ -243,20 +244,26 @@ func (cc *hugoBuilderCommon) getEnvironment(isServer bool) string {
 	return hugo.EnvironmentProduction
 }
 
+func (cc *hugoBuilderCommon) handleCommonBuilderFlags(cmd *cobra.Command) {
+	cmd.PersistentFlags().StringVarP(&cc.source, "source", "s", "", "filesystem path to read files relative from")
+	cmd.PersistentFlags().SetAnnotation("source", cobra.BashCompSubdirsInDir, []string{})
+	cmd.PersistentFlags().StringVarP(&cc.environment, "environment", "e", "", "build environment")
+	cmd.PersistentFlags().StringP("themesDir", "", "", "filesystem path to themes directory")
+	cmd.PersistentFlags().BoolP("ignoreVendor", "", false, "ignores any _vendor directory")
+}
+
 func (cc *hugoBuilderCommon) handleFlags(cmd *cobra.Command) {
+	cc.handleCommonBuilderFlags(cmd)
 	cmd.Flags().Bool("cleanDestinationDir", false, "remove files from destination not found in static directories")
 	cmd.Flags().BoolP("buildDrafts", "D", false, "include content marked as draft")
 	cmd.Flags().BoolP("buildFuture", "F", false, "include content with publishdate in the future")
 	cmd.Flags().BoolP("buildExpired", "E", false, "include expired content")
-	cmd.Flags().StringVarP(&cc.source, "source", "s", "", "filesystem path to read files relative from")
-	cmd.Flags().StringVarP(&cc.environment, "environment", "e", "", "build environment")
 	cmd.Flags().StringP("contentDir", "c", "", "filesystem path to content directory")
 	cmd.Flags().StringP("layoutDir", "l", "", "filesystem path to layout directory")
 	cmd.Flags().StringP("cacheDir", "", "", "filesystem path to cache directory. Defaults: $TMPDIR/hugo_cache/")
 	cmd.Flags().BoolP("ignoreCache", "", false, "ignores the cache directory")
 	cmd.Flags().StringP("destination", "d", "", "filesystem path to write files to")
 	cmd.Flags().StringSliceP("theme", "t", []string{}, "themes to use (located in /themes/THEMENAME/)")
-	cmd.Flags().StringP("themesDir", "", "", "filesystem path to themes directory")
 	cmd.Flags().StringVarP(&cc.baseURL, "baseURL", "b", "", "hostname (and path) to the root, e.g. http://spf13.com/")
 	cmd.Flags().Bool("enableGitInfo", false, "add Git revision, date and author info to the pages")
 	cmd.Flags().BoolVar(&cc.gc, "gc", false, "enable to run some cleanup tasks (remove unused cache files) after the build")