Add CLI progress bars to the packer tool

Since packing can be quite slow, it is nice to display progress to the
caller. We use the excellent github.com/vbauerster/mpb library to do so,
and add a bit of colour with github.com/logrusru/aurora.

Finally, augment the inspector and packer with a summary printer that
displays the overall file size/count, and compression ratio for each
compression type.

cmd/htpacker/pack.go

@@ -10,6 +10,7 @@ import (
 	"github.com/spf13/cobra"
 	yaml "gopkg.in/yaml.v2"
 	"src.lwithers.me.uk/go/htpack/cmd/htpacker/packer"
+	"src.lwithers.me.uk/go/htpack/packed"
 )
 
 var packCmd = &cobra.Command{
@@ -89,7 +90,8 @@ func PackFiles(c *cobra.Command, args []string, out string) error {
 	if err != nil {
 		return err
 	}
-	return packer.Pack(ftp, out)
+
+	return doPack(ftp, out)
 }
 
 func PackSpec(c *cobra.Command, spec, out string) error {
@@ -103,5 +105,26 @@ func PackSpec(c *cobra.Command, spec, out string) error {
 		return fmt.Errorf("parsing YAML spec %s: %v", spec, err)
 	}
 
-	return packer.Pack(ftp, out)
+	return doPack(ftp, out)
+}
+
+func doPack(ftp packer.FilesToPack, out string) error {
+	prog := mpbProgress(ftp)
+	err := packer.Pack2(ftp, out, prog)
+	prog.Complete()
+
+	if err == nil {
+		fin, err := os.Open(out)
+		if err != nil {
+			return err
+		}
+		defer fin.Close()
+
+		_, dir, err := packed.Load(fin)
+		if err != nil {
+			return err
+		}
+		inspectSummary(dir)
+	}
+	return err
 }