port text presenter to a format object (#604)

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

internal/formats/formats.go

@@ -7,6 +7,7 @@ import (
 	"github.com/anchore/syft/internal/formats/spdx22json"
 	"github.com/anchore/syft/internal/formats/syftjson"
 	"github.com/anchore/syft/internal/formats/table"
+	"github.com/anchore/syft/internal/formats/text"
 	"github.com/anchore/syft/syft/format"
 )
 
@@ -17,6 +18,7 @@ func All() []format.Format {
 		table.Format(),
 		cyclonedx12xml.Format(),
 		spdx22json.Format(),
+		text.Format(),
 	}
 }
 

internal/formats/text/encoder.go

@@ -1,42 +1,27 @@
-package packages
+package text
 
 import (
 	"fmt"
-
 	"io"
 	"text/tabwriter"
 
+	"github.com/anchore/syft/syft/distro"
 	"github.com/anchore/syft/syft/pkg"
 	"github.com/anchore/syft/syft/source"
 )
 
-// TextPresenter is a human-friendly text presenter to represent package and source data.
-type TextPresenter struct {
-	catalog     *pkg.Catalog
-	srcMetadata source.Metadata
-}
-
-// NewTextPresenter creates a new presenter for the given set of catalog and image data.
-func NewTextPresenter(catalog *pkg.Catalog, srcMetadata source.Metadata) *TextPresenter {
-	return &TextPresenter{
-		catalog:     catalog,
-		srcMetadata: srcMetadata,
-	}
-}
-
-// Present is a method that is in charge of writing to an output buffer
-func (pres *TextPresenter) Present(output io.Writer) error {
+func encoder(output io.Writer, catalog *pkg.Catalog, srcMetadata *source.Metadata, _ *distro.Distro, _ source.Scope) error {
 	// init the tabular writer
 	w := new(tabwriter.Writer)
 	w.Init(output, 0, 8, 0, '\t', tabwriter.AlignRight)
 
-	switch pres.srcMetadata.Scheme {
+	switch srcMetadata.Scheme {
 	case source.DirectoryScheme:
-		fmt.Fprintf(w, "[Path: %s]\n", pres.srcMetadata.Path)
+		fmt.Fprintf(w, "[Path: %s]\n", srcMetadata.Path)
 	case source.ImageScheme:
 		fmt.Fprintln(w, "[Image]")
 
-		for idx, l := range pres.srcMetadata.ImageMetadata.Layers {
+		for idx, l := range srcMetadata.ImageMetadata.Layers {
 			fmt.Fprintln(w, " Layer:\t", idx)
 			fmt.Fprintln(w, " Digest:\t", l.Digest)
 			fmt.Fprintln(w, " Size:\t", l.Size)
@@ -45,12 +30,12 @@ func (pres *TextPresenter) Present(output io.Writer) error {
 			w.Flush()
 		}
 	default:
-		return fmt.Errorf("unsupported source: %T", pres.srcMetadata.Scheme)
+		return fmt.Errorf("unsupported source: %T", srcMetadata.Scheme)
 	}
 
 	// populate artifacts...
 	rows := 0
-	for _, p := range pres.catalog.Sorted() {
+	for _, p := range catalog.Sorted() {
 		fmt.Fprintf(w, "[%s]\n", p.Name)
 		fmt.Fprintln(w, " Version:\t", p.Version)
 		fmt.Fprintln(w, " Type:\t", string(p.Type))

internal/formats/text/encoder_test.go

@@ -1,27 +1,30 @@
-package packages
+package text
 
 import (
 	"flag"
 	"testing"
 
+	"github.com/anchore/syft/syft/source"
+
 	"github.com/anchore/syft/internal/formats/common/testutils"
+	"github.com/anchore/syft/syft/format"
 )
 
 var updateTextPresenterGoldenFiles = flag.Bool("update-text", false, "update the *.golden files for text presenters")
 
 func TestTextDirectoryPresenter(t *testing.T) {
-	catalog, metadata, _ := testutils.DirectoryInput(t)
+	catalog, metadata, d := testutils.DirectoryInput(t)
 	testutils.AssertPresenterAgainstGoldenSnapshot(t,
-		NewTextPresenter(catalog, metadata),
+		format.NewPresenter(encoder, catalog, &metadata, d, source.UnknownScope),
 		*updateTextPresenterGoldenFiles,
 	)
 }
 
 func TestTextImagePresenter(t *testing.T) {
 	testImage := "image-simple"
-	catalog, metadata, _ := testutils.ImageInput(t, testImage, testutils.FromSnapshot())
+	catalog, metadata, d := testutils.ImageInput(t, testImage, testutils.FromSnapshot())
 	testutils.AssertPresenterAgainstGoldenImageSnapshot(t,
-		NewTextPresenter(catalog, metadata),
+		format.NewPresenter(encoder, catalog, &metadata, d, source.SquashedScope),
 		testImage,
 		*updateTextPresenterGoldenFiles,
 	)

internal/formats/text/format.go

@@ -0,0 +1,12 @@
+package text
+
+import "github.com/anchore/syft/syft/format"
+
+func Format() format.Format {
+	return format.NewFormat(
+		format.TextOption,
+		encoder,
+		nil,
+		nil,
+	)
+}

internal/formats/text/test-fixtures/image-simple/Dockerfile

@@ -0,0 +1,4 @@
+# Note: changes to this file will result in updating several test values. Consider making a new image fixture instead of editing this one.
+FROM scratch
+ADD file-1.txt /somefile-1.txt
+ADD file-2.txt /somefile-2.txt

internal/formats/text/test-fixtures/image-simple/file-1.txt

@@ -0,0 +1 @@
+this file has contents

internal/formats/text/test-fixtures/image-simple/file-2.txt

@@ -0,0 +1 @@
+file-2 contents!

syft/presenter/packages/presenter.go

@@ -14,8 +14,6 @@ import (
 // Presenter returns a presenter for images or directories
 func Presenter(option format.Option, config PresenterConfig) presenter.Presenter {
 	switch option {
-	case format.TextOption:
-		return packages.NewTextPresenter(config.Catalog, config.SourceMetadata)
 	case format.SPDXTagValueOption:
 		return packages.NewSPDXTagValuePresenter(config.Catalog, config.SourceMetadata)
 	default: