First try at adding minifier for files

go.mod

@@ -1,10 +1,11 @@
 module github.com/piranha/gostatic
 
 require (
-	github.com/fsnotify/fsnotify v1.4.7
+	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gorilla/websocket v1.4.1
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/russross/blackfriday v1.5.2
+	github.com/tdewolff/minify/v2 v2.8.0
 	golang.org/x/tools v0.0.0-20200123022218-593de606220b // indirect
 	gopkg.in/yaml.v2 v2.2.1
 )

go.sum

@@ -1,11 +1,24 @@
+github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927/go.mod h1:h/aW8ynjgkuj+NQRlZcDbAbM1ORAbXjXX77sX7T289U=
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/gorilla/websocket v1.4.1 h1:q7AeDBpnBk8AogcD4DSag/Ukw/KV+YhzLj2bP5HvKCM=
 github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/jessevdk/go-flags v1.4.0 h1:4IU2WS7AumrZ/40jfhf4QVDMsQwqA7VEHozFRrGARJA=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
+github.com/matryer/try v0.0.0-20161228173917-9ac251b645a2/go.mod h1:0KeJpeMD6o+O4hW7qJOT7vyQPKrWmj26uf5wMc/IiIs=
 github.com/russross/blackfriday v1.5.2 h1:HyvC0ARfnZBqnXwABFeSZHpKvJHJJfPz81GNueLj0oo=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/tdewolff/minify v1.1.0 h1:nxHQi1ML+g3ZbZHffiZ6eC7vMqNvSRfX3KB5Y5y/kfw=
+github.com/tdewolff/minify v2.3.6+incompatible h1:2hw5/9ZvxhWLvBUnHE06gElGYz+Jv9R4Eys0XUzItYo=
+github.com/tdewolff/minify/v2 v2.8.0 h1:t3tOPWkTpKhsgxm3IM9Sy8hE2eIt30Oaa+2havJGGIE=
+github.com/tdewolff/minify/v2 v2.8.0/go.mod h1:6zN8VLhMfFxNrwHROcboYNo2+huPNu4SV8DPh3PUQ8E=
+github.com/tdewolff/parse/v2 v2.4.4 h1:uMdbQRtYbKR/msP9CbI7li9wK6pionYiH6s7ipltyGY=
+github.com/tdewolff/parse/v2 v2.4.4/go.mod h1:WzaJpRSbwq++EIQHYIRTpbYKNA3gn9it1Ik++q4zyho=
+github.com/tdewolff/test v1.0.6/go.mod h1:6DAvZliBAAnD7rhVgwaM7DE5/d9NMOAJ09SqYqeK4QE=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
@@ -17,6 +30,9 @@ golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c h1:UIcGWL6/wpCfyGuJnRFJRurA+yj8RrW7Q6x2YMCXt6c=
+golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20200123022218-593de606220b h1:ztSlcncMErSAUzXwnVO1iTPxHwtvOHBB26SGiyYXIEE=
 golang.org/x/tools v0.0.0-20200123022218-593de606220b/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=

processors/default.go

@@ -22,4 +22,5 @@ var DefaultProcessors = gostatic.ProcessorMap{
 	"ignorefuture":           NewIgnoreFutureProcessor(),
 	"jekyllify":              NewJekyllifyProcessor(),
 	"yaml":                   NewYamlProcessor(),
+	"minify":                 NewMinifyProcessor(),
 }

processors/minify.go

@@ -0,0 +1,57 @@
+package processors
+
+import (
+	"mime"
+	"path/filepath"
+	"regexp"
+
+	gostatic "github.com/piranha/gostatic/lib"
+	"github.com/tdewolff/minify/v2"
+	"github.com/tdewolff/minify/v2/css"
+	"github.com/tdewolff/minify/v2/html"
+	"github.com/tdewolff/minify/v2/js"
+	"github.com/tdewolff/minify/v2/json"
+	"github.com/tdewolff/minify/v2/svg"
+	"github.com/tdewolff/minify/v2/xml"
+)
+
+type MinifyProcessor struct {
+}
+
+func NewMinifyProcessor() *MinifyProcessor {
+	return &MinifyProcessor{}
+}
+
+func (p *MinifyProcessor) Process(page *gostatic.Page, args []string) error {
+	return ProcessPage(page, args)
+}
+
+func (p *MinifyProcessor) Description() string {
+	return "minify supported file types"
+}
+
+func (p *MinifyProcessor) Mode() int {
+	return gostatic.Post
+}
+
+func ProcessPage(page *gostatic.Page, args []string) error {
+	m := minify.New()
+
+	m.AddFunc("text/css", css.Minify)
+	m.AddFunc("text/html", html.Minify)
+	m.AddFunc("image/svg+xml", svg.Minify)
+	m.AddFuncRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma)script$"), js.Minify)
+	m.AddFuncRegexp(regexp.MustCompile("[/+]json$"), json.Minify)
+	m.AddFuncRegexp(regexp.MustCompile("[/+]xml$"), xml.Minify)
+
+	fileMime := mime.TypeByExtension(filepath.Ext(page.OutputPath()))
+
+	s, err := m.String(fileMime, page.Content())
+	if err != nil {
+		return err
+	}
+
+	page.SetContent(s)
+
+	return nil
+}