feat: graphviz cmd based on gno-roadmap implem (#659)

cmd/depviz/main.go

@@ -74,6 +74,11 @@ var (
 	fetchFlags       = flag.NewFlagSet("fetch", flag.ExitOnError)
 	fetchGitHubToken = fetchFlags.String("github-token", "", "GitHub token")
 	fetchResync      = fetchFlags.Bool("resync", false, "resync already synced content")
+
+	graphvizFlags = flag.NewFlagSet("graphviz", flag.ExitOnError)
+	graphvizLabel = graphvizFlags.String("label", "", "label to use for the graph")
+	graphvizType  = graphvizFlags.String("type", "svg", "output type (svg, png, dot)")
+	graphvizFile  = graphvizFlags.String("file", "", "output file (default: stdout)")
 )
 
 func main() {
@@ -130,7 +135,7 @@ func Main(args []string) error {
 				Name:      "gen",
 				ShortHelp: "use the db to generate outputs, without requiring any fetch",
 				Subcommands: []*ffcli.Command{
-					{Name: "graphviz", Exec: execGenGraphviz, ShortHelp: "generate graphviz output"},
+					{Name: "graphviz", Exec: execGenGraphviz, ShortHelp: "generate graphviz output", FlagSet: graphvizFlags},
 					{Name: "json", Exec: execGenJSON, ShortHelp: "generate JSON output"},
 					{Name: "csv", Exec: execGenCSV, ShortHelp: "generate CSV output"},
 				},
@@ -347,7 +352,35 @@ func storeFromArgs() (*cayley.Handle, error) {
 }
 
 func execGenGraphviz(ctx context.Context, args []string) error {
-	return fmt.Errorf("not implemented yet")
+	if err := globalPreRun(); err != nil {
+		return err
+	}
+
+	store, err := storeFromArgs()
+	if err != nil {
+		return fmt.Errorf("init store: %w", err)
+	}
+
+	genOpts := &dvcore.GenOpts{
+		Logger:           logger,
+		Schema:           schemaConfig,
+		Vertical:         *genVertical,
+		NoPert:           *genNoPert,
+		NoGraph:          *genNoGraph,
+		ShowClosed:       *genShowClosed,
+		HideIsolated:     *genHideIsolated,
+		HidePRs:          *genHidePRs,
+		HideExternalDeps: *genHideExternalDeps,
+	}
+
+	opts := dvcore.GraphvizOpts{
+		GenOpts: genOpts,
+		Label:   *graphvizLabel,
+		Type:    *graphvizType,
+		File:    *graphvizFile,
+	}
+
+	return dvcore.GenGraphviz(store, args, opts)
 }
 
 func execGenJSON(ctx context.Context, args []string) error {