refactor into pkg

cmd/node-prune/main.go

@@ -2,15 +2,13 @@ package main
 
 import (
 	"flag"
-	"os"
-	"path/filepath"
-	"sync/atomic"
 	"time"
 
 	"github.com/apex/log"
 	"github.com/apex/log/handlers/text"
 	"github.com/dustin/go-humanize"
-	"github.com/pkg/errors"
+
+	"github.com/tj/node-prune"
 )
 
 func init() {
@@ -32,7 +30,7 @@ func main() {
 		log.SetLevel(log.DebugLevel)
 	}
 
-	stats, err := prune(dir)
+	stats, err := prune.Prune(dir)
 	if err != nil {
 		log.Fatalf("error: %s", err)
 	}
@@ -44,48 +42,3 @@ func main() {
 		"duration":      time.Since(start).Round(time.Millisecond).String(),
 	}).Info("complete")
 }
-
-// Stats of the prune.
-type Stats struct {
-	FilesTotal   int64
-	FilesRemoved int64
-	SizeRemoved  int64
-}
-
-// prune files in dir.
-func prune(dir string) (*Stats, error) {
-	var stats Stats
-
-	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return err
-		}
-
-		if info.IsDir() {
-			return nil
-		}
-
-		atomic.AddInt64(&stats.FilesTotal, 1)
-
-		if !prunable(path, info) {
-			return nil
-		}
-
-		log.WithField("path", path).Debug("prune")
-		atomic.AddInt64(&stats.FilesRemoved, 1)
-		atomic.AddInt64(&stats.SizeRemoved, info.Size())
-		if err := os.Remove(path); err != nil {
-			return errors.Wrap(err, "removing")
-		}
-
-		return nil
-	})
-
-	return &stats, err
-}
-
-// prunable returns true if the file should be pruned.
-func prunable(path string, info os.FileInfo) bool {
-	ext := filepath.Ext(path)
-	return ext == ".ts" || ext == ".md"
-}

prune.go

@@ -0,0 +1,68 @@
+// Package prune provides node_modules pruning of unnecessary files.
+package prune
+
+import (
+	"os"
+	"path/filepath"
+	"sync/atomic"
+
+	"github.com/apex/log"
+	"github.com/pkg/errors"
+)
+
+// Stats for a prune.
+type Stats struct {
+	FilesTotal   int64
+	FilesRemoved int64
+	SizeRemoved  int64
+}
+
+// Pruner is a module pruner.
+type Pruner struct {
+	Dir string
+	Log log.Interface
+}
+
+// Prune dir of unnecessary files.
+func Prune(dir string) (*Stats, error) {
+	return Pruner{dir, log.Log}.Prune()
+}
+
+// Prune performs the pruning.
+func (p Pruner) Prune() (*Stats, error) {
+	var stats Stats
+
+	err := filepath.Walk(p.Dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() {
+			return nil
+		}
+
+		atomic.AddInt64(&stats.FilesTotal, 1)
+
+		if !prunable(path, info) {
+			return nil
+		}
+
+		p.Log.WithField("path", path).Debug("prune")
+		atomic.AddInt64(&stats.FilesRemoved, 1)
+		atomic.AddInt64(&stats.SizeRemoved, info.Size())
+
+		if err := os.Remove(path); err != nil {
+			return errors.Wrap(err, "removing")
+		}
+
+		return nil
+	})
+
+	return &stats, err
+}
+
+// prunable returns true if the file should be pruned.
+func prunable(path string, info os.FileInfo) bool {
+	ext := filepath.Ext(path)
+	return ext == ".ts" || ext == ".md"
+}