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generate_buildtime.go
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/
generate_buildtime.go
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// +build ignore
package main
import (
"os"
"text/template"
"time"
)
var buildtimeTmpl = template.Must(template.New("").Parse(`package server
// Code generated by go generate; DO NOT EDIT.
import (
"bufio"
"fmt"
"io"
"net/http"
"regexp"
"strings"
"github.com/tdewolff/minify"
)
const buildtime = "{{ .buildtime }}"
var (
faviconRegexp = regexp.MustCompile({{ .favicon }})
cssRegexp = regexp.MustCompile({{ .css }})
jsRegexp = regexp.MustCompile({{ .js }})
)
type BuildtimeResponseWriter struct {
res http.ResponseWriter
mw io.WriteCloser
}
func (m BuildtimeResponseWriter) Write(b []byte) (int, error) {
return m.mw.Write(b)
}
func (m BuildtimeResponseWriter) Close() error {
return m.mw.Close()
}
// BuildtimeFilter modifies the HTML files in order to force assets refresh on new build.
func BuildtimeFilter(mediatype string, res http.ResponseWriter) BuildtimeResponseWriter {
m := minify.New()
m.AddFunc("text/html", func(m *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
rb := bufio.NewReader(r)
for {
line, err := rb.ReadString('\n')
if err != nil && err != io.EOF {
return err
}
var sed []string
if m := faviconRegexp.FindAllStringSubmatch(line, -1); len(m) > 0 {
sed = m[0]
}
if m := jsRegexp.FindAllStringSubmatch(line, -1); len(m) > 0 {
sed = m[0]
}
if m := cssRegexp.FindAllStringSubmatch(line, -1); len(m) > 0 {
sed = m[0]
}
if sed != nil {
line = strings.Replace(line, sed[1], fmt.Sprintf("%s?buildtime=%s", sed[1], buildtime), -1)
}
if _, errws := io.WriteString(w, line); errws != nil {
return errws
}
if err == io.EOF {
break
}
}
return nil
})
mw := m.Writer(mediatype, res)
return BuildtimeResponseWriter{res: res, mw: mw}
}
`))
func main() {
f, err := os.Create("./server/buildtime.go")
check(err)
defer f.Close()
err = buildtimeTmpl.Execute(f, map[string]interface{}{
"buildtime": time.Now().Unix(),
"favicon": "`<link href=\"([^\"]*)\" rel=\"icon\">`",
"css": "`<link rel=\"stylesheet\" href=\"([^\"]*)\" />`",
"js": "`<script src=\"([^\"]*)\"></script>`",
})
check(err)
}
func check(err error) {
if err != nil {
panic(err)
}
}