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package main
import (
"bytes"
"fmt"
"go/build"
"go/format"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
)
const boxFilename = "rice-box.go"
func operationEmbedGo(pkg *build.Package) {
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")
var boxes []*boxDataType
for boxname := range boxMap {
// find path and filename for this box
boxPath := filepath.Join(pkg.Dir, boxname)
// Check to see if the path for the box is a symbolic link. If so, simply
// box what the symbolic link points to. Note: the filepath.Walk function
// will NOT follow any nested symbolic links. This only handles the case
// where the root of the box is a symbolic link.
symPath, serr := os.Readlink(boxPath)
if serr == nil {
boxPath = symPath
}
// verbose info
verbosef("embedding box '%s' to '%s'\n", boxname, 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 := &boxDataType{
BoxName: boxname,
UnixNow: boxInfo.ModTime().Unix(),
Files: make([]*fileDataType, 0),
Dirs: make(map[string]*dirDataType),
}
if !boxInfo.IsDir() {
fmt.Printf("Error: Box %s must point to a directory but points to %s instead\n",
boxname, boxPath)
os.Exit(1)
}
// 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() {
dirData := &dirDataType{
Identifier: "dir" + nextIdentifier(),
FileName: filename,
ModTime: info.ModTime().Unix(),
ChildFiles: make([]*fileDataType, 0),
ChildDirs: make([]*dirDataType, 0),
}
verbosef("\tincludes dir: '%s'\n", dirData.FileName)
box.Dirs[dirData.FileName] = dirData
// add tree entry (skip for root, it'll create a recursion)
if dirData.FileName != "" {
pathParts := strings.Split(dirData.FileName, "/")
parentDir := box.Dirs[strings.Join(pathParts[:len(pathParts)-1], "/")]
parentDir.ChildDirs = append(parentDir.ChildDirs, dirData)
}
} else {
fileData := &fileDataType{
Identifier: "file" + nextIdentifier(),
FileName: filename,
ModTime: info.ModTime().Unix(),
}
verbosef("\tincludes file: '%s'\n", fileData.FileName)
fileData.Content, err = ioutil.ReadFile(path)
if err != nil {
fmt.Printf("error reading file content while walking box: %s\n", err)
os.Exit(1)
}
box.Files = append(box.Files, fileData)
// add tree entry
pathParts := strings.Split(fileData.FileName, "/")
parentDir := box.Dirs[strings.Join(pathParts[:len(pathParts)-1], "/")]
if parentDir == nil {
fmt.Printf("Error: parent of %s is not within the box\n", path)
os.Exit(1)
}
parentDir.ChildFiles = append(parentDir.ChildFiles, fileData)
}
return nil
})
boxes = append(boxes, box)
}
embedSourceUnformated := bytes.NewBuffer(make([]byte, 0))
// execute template to buffer
err := tmplEmbeddedBox.Execute(
embedSourceUnformated,
embedFileDataType{pkg.Name, boxes},
)
if err != nil {
log.Printf("error writing embedded box to file (template execute): %s\n", err)
os.Exit(1)
}
// format the source code
embedSource, err := format.Source(embedSourceUnformated.Bytes())
if err != nil {
log.Printf("error formatting embedSource: %s\n", err)
os.Exit(1)
}
// create go file for box
boxFile, err := os.Create(filepath.Join(pkg.Dir, boxFilename))
if err != nil {
log.Printf("error creating embedded box file: %s\n", err)
os.Exit(1)
}
defer boxFile.Close()
// write source to file
_, err = io.Copy(boxFile, bytes.NewBuffer(embedSource))
if err != nil {
log.Printf("error writing embedSource to file: %s\n", err)
os.Exit(1)
}
}
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