harness-drone/contrib/generate-js.go

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2015-09-30 01:21:17 +00:00
// +build ignore
// This program minifies JavaScript files
// $ go run generate-js.go -dir scripts/ -out scripts/drone.min.js
package main
import (
"bytes"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/dchest/jsmin"
)
var (
dir = flag.String("dir", "scripts/", "")
out = flag.String("o", "scripts/drone.min.js", "")
)
func main() {
flag.Parse()
var buf bytes.Buffer
// walk the directory tree and write all
// javascript files to the buffer.
filepath.Walk(*dir, func(path string, info os.FileInfo, err error) error {
if filepath.Ext(path) != ".js" {
return nil
}
f, err := os.Open(path)
if err != nil {
return nil
}
defer f.Close()
// write the file name to the minified output
fmt.Fprintf(&buf, "// %s\n", path)
// copy the file to the buffer
_, err = io.Copy(&buf, f)
return err
})
// minifies the javascript
data, err := jsmin.Minify(buf.Bytes())
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// write the minified output
ioutil.WriteFile(*out, data, 0700)
}