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package main
import (
"bytes"
"encoding/gob"
"fmt"
"go/build"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strings"
"text/template"
"github.com/GeertJohan/go.rice/embedded"
"github.com/akavel/rsrc/coff"
)
type sizedReader struct {
*bytes.Reader
}
func (s sizedReader) Size() int64 {
return int64(s.Len())
}
var tmplEmbeddedSysoHelper *template.Template
func init() {
var err error
tmplEmbeddedSysoHelper, err = template.New("embeddedSysoHelper").Parse(`package {{.Package}}
// ############# GENERATED CODE #####################
// ## This file was generated by the rice tool.
// ## Do not edit unless you know what you're doing.
// ##################################################
// extern char _bricebox_{{.Symname}}[], _ericebox_{{.Symname}};
// int get_{{.Symname}}_length() {
// return &_ericebox_{{.Symname}} - _bricebox_{{.Symname}};
// }
import "C"
import (
"bytes"
"encoding/gob"
"github.com/GeertJohan/go.rice/embedded"
"unsafe"
)
func init() {
ptr := unsafe.Pointer(&C._bricebox_{{.Symname}})
bts := C.GoBytes(ptr, C.get_{{.Symname}}_length())
embeddedBox := &embedded.EmbeddedBox{}
err := gob.NewDecoder(bytes.NewReader(bts)).Decode(embeddedBox)
if err != nil {
panic("error decoding embedded box: "+err.Error())
}
embeddedBox.Link()
embedded.RegisterEmbeddedBox(embeddedBox.Name, embeddedBox)
}`)
if err != nil {
panic("could not parse template embeddedSysoHelper: " + err.Error())
}
}
type embeddedSysoHelperData struct {
Package string
Symname string
}
func operationEmbedSyso(pkg *build.Package) {
regexpSynameReplacer := regexp.MustCompile(`[^a-z0-9_]`)
boxMap := findBoxes(pkg)
// notify user when no calls to rice.FindBox are made (is this an error and therefore os.Exit(1) ?
if len(boxMap) == 0 {
fmt.Println("no calls to rice.FindBox() found")
return
}
verbosef("\n")
for boxname := range boxMap {
// find path and filename for this box
boxPath := filepath.Join(pkg.Dir, boxname)
boxFilename := strings.Replace(boxname, "/", "-", -1)
boxFilename = strings.Replace(boxFilename, "..", "back", -1)
boxFilename = strings.Replace(boxFilename, ".", "-", -1)
// verbose info
verbosef("embedding box '%s'\n", boxname)
verbosef("\tto file %s\n", boxFilename)
// read box metadata
boxInfo, ierr := os.Stat(boxPath)
if ierr != nil {
fmt.Printf("Error: unable to access box at %s\n", boxPath)
os.Exit(1)
}
// create box datastructure (used by template)
box := &embedded.EmbeddedBox{
Name: boxname,
Time: boxInfo.ModTime(),
EmbedType: embedded.EmbedTypeSyso,
Files: make(map[string]*embedded.EmbeddedFile),
Dirs: make(map[string]*embedded.EmbeddedDir),
}
// fill box datastructure with file data
filepath.Walk(boxPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
fmt.Printf("error walking box: %s\n", err)
os.Exit(1)
}
filename := strings.TrimPrefix(path, boxPath)
filename = strings.Replace(filename, "\\", "/", -1)
filename = strings.TrimPrefix(filename, "/")
if info.IsDir() {
embeddedDir := &embedded.EmbeddedDir{
Filename: filename,
DirModTime: info.ModTime(),
}
verbosef("\tincludes dir: '%s'\n", embeddedDir.Filename)
box.Dirs[embeddedDir.Filename] = embeddedDir
// add tree entry (skip for root, it'll create a recursion)
if embeddedDir.Filename != "" {
pathParts := strings.Split(embeddedDir.Filename, "/")
parentDir := box.Dirs[strings.Join(pathParts[:len(pathParts)-1], "/")]
parentDir.ChildDirs = append(parentDir.ChildDirs, embeddedDir)
}
} else {
embeddedFile := &embedded.EmbeddedFile{
Filename: filename,
FileModTime: info.ModTime(),
Content: "",
}
verbosef("\tincludes file: '%s'\n", embeddedFile.Filename)
contentBytes, err := ioutil.ReadFile(path)
if err != nil {
fmt.Printf("error reading file content while walking box: %s\n", err)
os.Exit(1)
}
embeddedFile.Content = string(contentBytes)
box.Files[embeddedFile.Filename] = embeddedFile
}
return nil
})
// encode embedded box to gob file
boxGobBuf := &bytes.Buffer{}
err := gob.NewEncoder(boxGobBuf).Encode(box)
if err != nil {
fmt.Printf("error encoding box to gob: %v\n", err)
os.Exit(1)
}
verbosef("gob-encoded embeddedBox is %d bytes large\n", boxGobBuf.Len())
// write coff
symname := regexpSynameReplacer.ReplaceAllString(boxname, "_")
createCoffSyso(boxname, symname, "386", boxGobBuf.Bytes())
createCoffSyso(boxname, symname, "amd64", boxGobBuf.Bytes())
// write go
sysoHelperData := embeddedSysoHelperData{
Package: pkg.Name,
Symname: symname,
}
fileSysoHelper, err := os.Create(boxFilename + ".rice-box.go")
if err != nil {
fmt.Printf("error creating syso helper: %v\n", err)
os.Exit(1)
}
err = tmplEmbeddedSysoHelper.Execute(fileSysoHelper, sysoHelperData)
if err != nil {
fmt.Printf("error executing tmplEmbeddedSysoHelper: %v\n", err)
os.Exit(1)
}
}
}
func createCoffSyso(boxFilename string, symname string, arch string, data []byte) {
boxCoff := coff.NewRDATA()
switch arch {
case "386":
case "amd64":
boxCoff.FileHeader.Machine = 0x8664
default:
panic("invalid arch")
}
boxCoff.AddData("_bricebox_"+symname, sizedReader{bytes.NewReader(data)})
boxCoff.AddData("_ericebox_"+symname, io.NewSectionReader(strings.NewReader("\000\000"), 0, 2)) // TODO: why? copied from rsrc, which copied it from as-generated
boxCoff.Freeze()
err := writeCoff(boxCoff, boxFilename+"_"+arch+".rice-box.syso")
if err != nil {
fmt.Printf("error writing %s coff/.syso: %v\n", arch, err)
os.Exit(1)
}
}
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