folder2go/main.go

// Grabs a folder and generates a go file with a map
package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
)

func main() {
	if len(os.Args) != 3 {
		fmt.Println("This will create a folder named by <pkgname> and add the generated file")
		fmt.Println("usage: ", os.Args[0], " <folder> <pkgname>")
		return
	}

	var folder = os.Args[1]

	var pkg = filepath.Base(os.Args[2]) // Remove trailing '/'
	var dst = os.Args[2]
	var data = map[string]string{}

	filepath.Walk(folder, func(fpath string, f os.FileInfo, err error) error {
		if f.IsDir() {
			return nil // Continue
		}
		// Get ABSPATH
		absFolder, err := filepath.Abs(folder)
		if err != nil {
			return err
		}
		absPath, err := filepath.Abs(fpath)
		if err != nil {
			return err
		}

		kfname := absPath[len(absFolder):]

		log.Printf("Processing: %s ", kfname)
		fdata, err := ioutil.ReadFile(fpath)
		if err != nil {
			log.Fatal(err)
			return err
		}
		vardata := ""
		for _, v := range fdata {
			vardata += fmt.Sprintf("\\x%02X", v)
		}
		data[kfname] = vardata

		return nil
	})

	// Write golang file
	os.Mkdir(dst, os.FileMode(0755))
	f, err := os.OpenFile(fmt.Sprintf("%s/%s.go", dst, pkg), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0644))
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	f.WriteString("// Generated by folder2go\n")
	f.WriteString(fmt.Sprintf("package %s\n\n", pkg))

	// If we want http support
	// Templates would be nice here
	f.WriteString(`
import (
	"mime"
	"net/http"
	"path/filepath"
)
	`)

	f.WriteString("//Data exported data taken from folder\n")
	f.WriteString("var Data = map[string][]byte {\n")
	for k, v := range data {
		f.WriteString(fmt.Sprintf("\t\"%s\":\t\t[]byte(\"%s\"),\n", k, v))
	}

	f.WriteString("}\n")
	// Should be optional
	f.WriteString(`
func AssetHandleFunc(w http.ResponseWriter, r *http.Request) {
	var solvedPath =r.URL.Path
	if solvedPath == "/" {
		solvedPath = "/index.html"
	}
	data, ok := Data[solvedPath]
	if !ok {
		w.WriteHeader(404)
	}
	w.Header().Set("Content-type",mime.TypeByExtension(filepath.Ext(solvedPath)))
	w.Write(data)
}`)

}