Add GetRepoSize implemented using count-objects (#40)

Author: cez81

repo.go

@@ -11,7 +11,10 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strings"
 	"time"
+
+	"github.com/Unknwon/com"
 )
 
 // Repository represents a Git repository.
@@ -198,3 +201,63 @@ func MoveFile(repoPath, oldTreeName, newTreeName string) error {
 	_, err := NewCommand("mv").AddArguments(oldTreeName, newTreeName).RunInDir(repoPath)
 	return err
 }
+
+// CountObject represents repository count objects report
+type CountObject struct {
+	Count       int64
+	Size        int64
+	InPack      int64
+	Packs       int64
+	SizePack    int64
+	PrunePack   int64
+	Garbage     int64
+	SizeGarbage int64
+}
+
+const (
+	statCount        = "count: "
+	statSize         = "size: "
+	statInpack       = "in-pack: "
+	statPacks        = "packs: "
+	statSizePack     = "size-pack: "
+	statPrunePackage = "prune-package: "
+	statGarbage      = "garbage: "
+	statSizeGarbage  = "size-garbage: "
+)
+
+// GetRepoSize returns disk consumption for repo in path
+func GetRepoSize(repoPath string) (*CountObject, error) {
+	cmd := NewCommand("count-objects", "-v")
+	stdout, err := cmd.RunInDir(repoPath)
+	if err != nil {
+		return nil, err
+	}
+
+	return parseSize(stdout), nil
+}
+
+// parseSize parses the output from count-objects and return a CountObject
+func parseSize(objects string) *CountObject {
+	repoSize := new(CountObject)
+	for _, line := range strings.Split(objects, "\n") {
+		switch {
+		case strings.HasPrefix(line, statCount):
+			repoSize.Count = com.StrTo(line[7:]).MustInt64()
+		case strings.HasPrefix(line, statSize):
+			repoSize.Size = com.StrTo(line[6:]).MustInt64() * 1024
+		case strings.HasPrefix(line, statInpack):
+			repoSize.InPack = com.StrTo(line[9:]).MustInt64()
+		case strings.HasPrefix(line, statPacks):
+			repoSize.Packs = com.StrTo(line[7:]).MustInt64()
+		case strings.HasPrefix(line, statSizePack):
+			repoSize.SizePack = com.StrTo(line[11:]).MustInt64() * 1024
+		case strings.HasPrefix(line, statPrunePackage):
+			repoSize.PrunePack = com.StrTo(line[16:]).MustInt64()
+		case strings.HasPrefix(line, statGarbage):
+			repoSize.Garbage = com.StrTo(line[9:]).MustInt64()
+		case strings.HasPrefix(line, statSizeGarbage):
+			repoSize.SizeGarbage = com.StrTo(line[14:]).MustInt64() * 1024
+		}
+	}
+	return repoSize
+}