/
res2go.go
142 lines (127 loc) · 3.4 KB
/
res2go.go
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package main
import (
"bytes"
"flag"
"fmt"
"go/format"
"io/ioutil"
"os"
"path/filepath"
"strings"
"text/template"
)
var genTmpl string = `// generated by res2go DO NOT EDIT
package {{.Package}}
var {{.Prefix}}Files map[string][]byte
{{$prefix := .Prefix}}
func {{.Prefix}}Init(){
{{.Prefix}}Files = make(map[string][]byte)
{{- range $name, $file := .Resources }}
{{$prefix}}Files["{{ $name }}"] = []byte{ {{ format $file }} }
{{- end }}
}
`
type genCtx struct {
Package string
Resources map[string][]byte
Prefix string
}
func (g *genCtx) generate() ([]byte, error) {
fileTemplate := template.Must(template.New("").Funcs(map[string]interface{}{"format": FormatBuffer}).Parse(genTmpl))
stream := &bytes.Buffer{}
err := fileTemplate.Execute(stream, g)
if err != nil {
fmt.Fprintln(os.Stderr, "Error executing template", err)
return nil, err
}
return format.Source(stream.Bytes())
}
func FormatBuffer(sl []byte) string {
builder := strings.Builder{}
for i, v := range sl {
if i%40 == 0 {
builder.WriteString("\n")
}
builder.WriteString(fmt.Sprintf("0x%02x,", int(v)))
}
return builder.String()
}
func loadFile(file string, resdata map[string][]byte) error {
b, err := ioutil.ReadFile(file)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading %s: %s", file, err)
return err
}
key := strings.ReplaceAll(file, "\\", "/")
resdata[key] = b
fmt.Println(key, " added")
return nil
}
func loadDirectory(directory string, resdata map[string][]byte) error {
return filepath.Walk(directory,
func(path string, info os.FileInfo, err error) error {
fmt.Println("scanning ", path, " ", directory)
if err != nil {
fmt.Fprintln(os.Stderr, "Error :", err)
return err
}
// relativePath := filepath.ToSlash(strings.TrimPrefix(path, directory))
if info.IsDir() {
return nil
}
err = loadFile(path, resdata)
return err
})
}
func main() {
packageName := flag.String("package", "resources", "package name")
outputfile := flag.String("o", *packageName+".go", "output file")
prefix := flag.String("prefix", "", "add prefix to all exported function")
flag.Parse()
resources := flag.Args()
if resources == nil {
fmt.Fprintln(os.Stderr, "no directory nor files provided")
os.Exit(1)
}
ctx := genCtx{*packageName, make(map[string][]byte), *prefix}
for _, file := range resources {
fmt.Printf("Analyzing %s\n", file)
matches, _ := filepath.Glob(file)
for _, match := range matches {
fmt.Println(match)
info, err := os.Stat(match)
if os.IsNotExist(err) {
fmt.Fprintf(os.Stderr, "Resources %s does not exists\n", match)
break
}
if info.IsDir() {
err = loadDirectory(match, ctx.Resources)
if err != nil {
fmt.Fprintf(os.Stderr, "Error parsing directory %s : %v\n", info.Name(), err)
os.Exit(1)
}
} else {
err = loadFile(match, ctx.Resources)
if err != nil {
fmt.Fprintf(os.Stderr, "Error loading file %s : %v\n", info.Name(), err)
os.Exit(1)
}
}
}
}
// generate output TODO : Make directory package
data, err := ctx.generate()
if err != nil {
fmt.Fprintln(os.Stderr, "Error formatting generated code", err)
os.Exit(1)
}
err = os.MkdirAll(filepath.Dir(*outputfile), os.ModePerm)
if err != nil {
fmt.Fprintln(os.Stderr, "Error creating directory path", err)
os.Exit(1)
}
err = ioutil.WriteFile(*outputfile, data, 0644)
if err != nil {
fmt.Fprintln(os.Stderr, "Error writing blob file", err)
}
}