Switch UI to bubbletea (#1888)

* add bubbletea UI

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

* swap pipeline to go 1.20.x and add attest guard for cosign binary

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* update note in developing.md about the required golang version

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* fix merge conflict for windows path handling

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* temp test for attest handler

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* add addtional test iterations for background reader

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

cmd/syft/cli/convert/convert.go

@@ -6,20 +6,29 @@ import (
 	"io"
 	"os"
 
+	"github.com/wagoodman/go-partybus"
+
+	"github.com/anchore/stereoscope"
+	"github.com/anchore/syft/cmd/syft/cli/eventloop"
 	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/cmd/syft/internal/ui"
+	"github.com/anchore/syft/internal/bus"
 	"github.com/anchore/syft/internal/config"
 	"github.com/anchore/syft/internal/log"
+	"github.com/anchore/syft/syft"
 	"github.com/anchore/syft/syft/formats"
+	"github.com/anchore/syft/syft/sbom"
 )
 
 func Run(_ context.Context, app *config.Application, args []string) error {
 	log.Warn("convert is an experimental feature, run `syft convert -h` for help")
+
 	writer, err := options.MakeSBOMWriter(app.Outputs, app.File, app.OutputTemplatePath)
 	if err != nil {
 		return err
 	}
 
-	// this can only be a SBOM file
+	// could be an image or a directory, with or without a scheme
 	userInput := args[0]
 
 	var reader io.ReadCloser
@@ -37,10 +46,40 @@ func Run(_ context.Context, app *config.Application, args []string) error {
 		reader = f
 	}
 
-	sbom, _, err := formats.Decode(reader)
-	if err != nil {
-		return fmt.Errorf("failed to decode SBOM: %w", err)
-	}
+	eventBus := partybus.NewBus()
+	stereoscope.SetBus(eventBus)
+	syft.SetBus(eventBus)
+	subscription := eventBus.Subscribe()
 
-	return writer.Write(*sbom)
+	return eventloop.EventLoop(
+		execWorker(reader, writer),
+		eventloop.SetupSignals(),
+		subscription,
+		stereoscope.Cleanup,
+		ui.Select(options.IsVerbose(app), app.Quiet)...,
+	)
+}
+
+func execWorker(reader io.Reader, writer sbom.Writer) <-chan error {
+	errs := make(chan error)
+	go func() {
+		defer close(errs)
+		defer bus.Exit()
+
+		s, _, err := formats.Decode(reader)
+		if err != nil {
+			errs <- fmt.Errorf("failed to decode SBOM: %w", err)
+			return
+		}
+
+		if s == nil {
+			errs <- fmt.Errorf("no SBOM produced")
+			return
+		}
+
+		if err := writer.Write(*s); err != nil {
+			errs <- fmt.Errorf("failed to write SBOM: %w", err)
+		}
+	}()
+	return errs
 }