Add support for minification of final output

Hugo Pipes added minification support for resources fetched via ´resources.Get` and similar.

This also adds support for minification of the final output for supported output formats: HTML, XML, SVG, CSS, JavaScript, JSON.

To enable, run Hugo with the `--minify` flag:

```bash
hugo --minify
```

This commit is also a major spring cleaning of the `transform` package to allow the new minification step fit into that processing chain.

Fixes #1251

1 files changed, 5 insertions, 2 deletions

diff --git a/deps/deps.go b/deps/deps.go
index a0904483b..3eecffca2 100644
--- a/deps/deps.go
+++ b/deps/deps.go
@@ -162,7 +162,7 @@ func New(cfg DepsCfg) (*Deps, error) {
 		return nil, err
 	}
 
-	resourceSpec, err := resource.NewSpec(ps, logger, cfg.MediaTypes)
+	resourceSpec, err := resource.NewSpec(ps, logger, cfg.OutputFormats, cfg.MediaTypes)
 	if err != nil {
 		return nil, err
 	}
@@ -224,7 +224,7 @@ func (d Deps) ForLanguage(cfg DepsCfg) (*Deps, error) {
 	// The resource cache is global so reuse.
 	// TODO(bep) clean up these inits.
 	resourceCache := d.ResourceSpec.ResourceCache
-	d.ResourceSpec, err = resource.NewSpec(d.PathSpec, d.Log, cfg.MediaTypes)
+	d.ResourceSpec, err = resource.NewSpec(d.PathSpec, d.Log, cfg.OutputFormats, cfg.MediaTypes)
 	if err != nil {
 		return nil, err
 	}
@@ -267,6 +267,9 @@ type DepsCfg struct {
 	// The media types configured.
 	MediaTypes media.Types
 
+	// The output formats configured.
+	OutputFormats output.Formats
+
 	// Template handling.
 	TemplateProvider ResourceProvider
 	WithTemplate     func(templ tpl.TemplateHandler) error