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|
package builder
import (
"context"
"os"
"path/filepath"
"regexp"
"strings"
"sync"
"text/template"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
)
var DebugLog func(string, ...interface{})
func init() {
DebugLog = func(string, ...interface{}) {}
}
var invalidFilePattern = regexp.MustCompile(`(_test|-packr).go$`)
// Builder scans folders/files looking for `packr.NewBox` and then compiling
// the required static files into `<package-name>-packr.go` files so they can
// be built into Go binaries.
type Builder struct {
context.Context
RootPath string
IgnoredBoxes []string
IgnoredFolders []string
pkgs map[string]pkg
moot *sync.Mutex
Compress bool
}
// Run the builder.
func (b *Builder) Run() error {
wg := &errgroup.Group{}
root, err := filepath.EvalSymlinks(b.RootPath)
if err != nil {
return errors.WithStack(err)
}
err = filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if info == nil {
return filepath.SkipDir
}
base := strings.ToLower(filepath.Base(path))
if strings.HasPrefix(base, "_") {
return filepath.SkipDir
}
for _, f := range b.IgnoredFolders {
if strings.ToLower(f) == base {
return filepath.SkipDir
}
}
if !info.IsDir() {
wg.Go(func() error {
return b.process(path)
})
}
return nil
})
if err != nil {
return errors.WithStack(err)
}
if err := wg.Wait(); err != nil {
return errors.WithStack(err)
}
return b.dump()
}
func (b *Builder) dump() error {
for _, p := range b.pkgs {
name := filepath.Join(p.Dir, "a_"+p.Name+"-packr.go")
f, err := os.Create(name)
defer f.Close()
if err != nil {
return errors.WithStack(err)
}
t, err := template.New("").Parse(tmpl)
if err != nil {
return errors.WithStack(err)
}
err = t.Execute(f, p)
if err != nil {
return errors.WithStack(err)
}
}
return nil
}
func (b *Builder) process(path string) error {
ext := filepath.Ext(path)
if ext != ".go" || invalidFilePattern.MatchString(path) {
return nil
}
v := newVisitor(path)
if err := v.Run(); err != nil {
return errors.WithStack(err)
}
pk := pkg{
Dir: filepath.Dir(path),
Boxes: []box{},
Name: v.Package,
}
for _, n := range v.Boxes {
var ignored bool
for _, i := range b.IgnoredBoxes {
if n == i {
// this is an ignored box
ignored = true
break
}
}
if ignored {
continue
}
bx := &box{
Name: n,
Files: []file{},
compress: b.Compress,
}
DebugLog("building box %s\n", bx.Name)
p := filepath.Join(pk.Dir, bx.Name)
if err := bx.Walk(p); err != nil {
return errors.WithStack(err)
}
if len(bx.Files) > 0 {
pk.Boxes = append(pk.Boxes, *bx)
}
DebugLog("built box %s with %q\n", bx.Name, bx.Files)
}
if len(pk.Boxes) > 0 {
b.addPkg(pk)
}
return nil
}
func (b *Builder) addPkg(p pkg) {
b.moot.Lock()
defer b.moot.Unlock()
if _, ok := b.pkgs[p.Name]; !ok {
b.pkgs[p.Name] = p
return
}
pp := b.pkgs[p.Name]
pp.Boxes = append(pp.Boxes, p.Boxes...)
b.pkgs[p.Name] = pp
}
// New Builder with a given context and path
func New(ctx context.Context, path string) *Builder {
return &Builder{
Context: ctx,
RootPath: path,
IgnoredBoxes: []string{},
IgnoredFolders: []string{"vendor", ".git", "node_modules", ".idea"},
pkgs: map[string]pkg{},
moot: &sync.Mutex{},
}
}
|
