replace table presenter with format object (#586)

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

internal/formats/table/encoder.go

@@ -0,0 +1,81 @@
+package table
+
+import (
+	"fmt"
+	"io"
+	"sort"
+	"strings"
+
+	"github.com/olekukonko/tablewriter"
+
+	"github.com/anchore/syft/syft/distro"
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/source"
+)
+
+func encoder(output io.Writer, catalog *pkg.Catalog, _ *source.Metadata, _ *distro.Distro, _ source.Scope) error {
+	var rows [][]string
+
+	columns := []string{"Name", "Version", "Type"}
+	for _, p := range catalog.Sorted() {
+		row := []string{
+			p.Name,
+			p.Version,
+			string(p.Type),
+		}
+		rows = append(rows, row)
+	}
+
+	if len(rows) == 0 {
+		_, err := fmt.Fprintln(output, "No packages discovered")
+		return err
+	}
+
+	// sort by name, version, then type
+	sort.SliceStable(rows, func(i, j int) bool {
+		for col := 0; col < len(columns); col++ {
+			if rows[i][col] != rows[j][col] {
+				return rows[i][col] < rows[j][col]
+			}
+		}
+		return false
+	})
+	rows = removeDuplicateRows(rows)
+
+	table := tablewriter.NewWriter(output)
+
+	table.SetHeader(columns)
+	table.SetHeaderLine(false)
+	table.SetBorder(false)
+	table.SetAutoWrapText(false)
+	table.SetAutoFormatHeaders(true)
+	table.SetHeaderAlignment(tablewriter.ALIGN_LEFT)
+	table.SetAlignment(tablewriter.ALIGN_LEFT)
+	table.SetCenterSeparator("")
+	table.SetColumnSeparator("")
+	table.SetRowSeparator("")
+	table.SetTablePadding("  ")
+	table.SetNoWhiteSpace(true)
+
+	table.AppendBulk(rows)
+	table.Render()
+
+	return nil
+}
+
+func removeDuplicateRows(items [][]string) [][]string {
+	seen := map[string][]string{}
+	var result [][]string
+
+	for _, v := range items {
+		key := strings.Join(v, "|")
+		if seen[key] != nil {
+			// dup!
+			continue
+		}
+
+		seen[key] = v
+		result = append(result, v)
+	}
+	return result
+}

internal/formats/table/encoder_test.go

@@ -0,0 +1,50 @@
+package table
+
+import (
+	"flag"
+	"testing"
+
+	"github.com/anchore/syft/internal/formats/common/testutils"
+	"github.com/anchore/syft/syft/format"
+	"github.com/anchore/syft/syft/source"
+	"github.com/go-test/deep"
+)
+
+var updateTableGoldenFiles = flag.Bool("update-table", false, "update the *.golden files for table format")
+
+func TestTablePresenter(t *testing.T) {
+	catalog, metadata, distro := testutils.DirectoryInput(t)
+	testutils.AssertPresenterAgainstGoldenSnapshot(t,
+		format.NewPresenter(encoder, catalog, &metadata, distro, source.SquashedScope),
+		*updateTableGoldenFiles,
+	)
+}
+
+func TestRemoveDuplicateRows(t *testing.T) {
+	data := [][]string{
+		{"1", "2", "3"},
+		{"a", "b", "c"},
+		{"1", "2", "3"},
+		{"a", "b", "c"},
+		{"1", "2", "3"},
+		{"4", "5", "6"},
+		{"1", "2", "1"},
+	}
+
+	expected := [][]string{
+		{"1", "2", "3"},
+		{"a", "b", "c"},
+		{"4", "5", "6"},
+		{"1", "2", "1"},
+	}
+
+	actual := removeDuplicateRows(data)
+
+	if diffs := deep.Equal(expected, actual); len(diffs) > 0 {
+		t.Errorf("found diffs!")
+		for _, d := range diffs {
+			t.Errorf("   diff: %+v", d)
+		}
+	}
+
+}

internal/formats/table/format.go

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

internal/formats/table/test-fixtures/snapshot/TestTablePresenter.golden

@@ -0,0 +1,3 @@
+NAME       VERSION  TYPE   
+package-1  1.0.1    python  
+package-2  2.0.1    deb