WIP

file.go

@@ -31,6 +31,7 @@ type file struct {
 	path string
 	meta map[string]interface{}
 	buff *bytes.Buffer
+	err  error
 }
 
 func (f *file) Path() string {
@@ -50,6 +51,14 @@ func (f *file) SetProperty(key string, value interface{}) {
 	f.meta[key] = value
 }
 
+func (f *file) Error() error {
+	return f.err
+}
+
+func (f *file) SetError(err error) {
+	f.err = err
+}
+
 func (f *file) Data() (*bytes.Buffer, error) {
 	if f.buff != nil {
 		return f.buff, nil
@@ -57,12 +66,14 @@ func (f *file) Data() (*bytes.Buffer, error) {
 
 	file, err := os.Open(f.path)
 	if err != nil {
+		f.SetError(err)
 		return nil, err
 	}
 	defer file.Close()
 
 	var buff bytes.Buffer
 	if _, err := buff.ReadFrom(file); err != nil {
+		f.SetError(err)
 		return nil, err
 	}
 

goldsmith.go

@@ -23,21 +23,19 @@
 package goldsmith
 
 import (
+	"io/ioutil"
 	"path/filepath"
-	"sync"
 
 	"github.com/bmatcuk/doublestar"
 )
 
 type stage struct {
-	input  chan File
-	output chan File
+	input, output chan File
 }
 
 type goldsmith struct {
 	stages []stage
 	files  chan File
-	wg     sync.WaitGroup
 }
 
 func NewGoldsmith(path string) (Goldsmith, error) {
@@ -84,22 +82,34 @@ func (gs *goldsmith) stage() stage {
 }
 
 func (gs *goldsmith) NewFile(path string) File {
-	return &file{path, make(map[string]interface{}), nil}
+	return &file{path: path}
 }
 
 func (gs *goldsmith) Apply(p Processor) Goldsmith {
 	s := gs.stage()
-
-	gs.wg.Add(1)
-	go func() {
-		p.Process(gs, s.input, s.output)
-		gs.wg.Done()
-	}()
-
+	go p.Process(gs, s.input, s.output)
 	return gs
 }
 
-func (gs *goldsmith) Complete(path string) error {
-	gs.wg.Wait()
-	return nil
+func (gs *goldsmith) Complete(path string) []File {
+	s := gs.stages[len(gs.stages)-1]
+
+	var files []File
+	for file := range s.output {
+		data, err := file.Data()
+		if err != nil {
+			file.SetError(err)
+			continue
+		}
+
+		absPath := filepath.Join(path, file.Path())
+		if err := ioutil.WriteFile(absPath, data.Bytes(), 0644); err != nil {
+			file.SetError(err)
+			continue
+		}
+
+		files = append(files, file)
+	}
+
+	return files
 }

types.go

@@ -35,6 +35,9 @@ type File interface {
 	Property(key string) (interface{}, bool)
 	SetProperty(key string, value interface{})
 
+	Error() error
+	SetError(err error)
+
 	Data() (*bytes.Buffer, error)
 }
 
@@ -44,5 +47,5 @@ type Processor interface {
 
 type Goldsmith interface {
 	Apply(p Processor) Goldsmith
-	Complete(path string) error
+	Complete(path string) []File
 }