internal dump routine

cmd/cayley/cayley.go

@@ -219,7 +219,11 @@ func main() {
 			}
 		}
 
-		// internal.Dump()
+		err = internal.Dump(handle.QuadStore, *dumpFile, *dumpType)
+		if err != nil {
+			break
+		}
+
 		handle.Close()
 
 	case "repl":

internal/dump.go

@@ -0,0 +1,36 @@
+package internal
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/google/cayley/graph"
+	"github.com/google/cayley/exporter"
+)
+
+// Dump the content of the database into a file based
+// on a few different formats
+func Dump(qs graph.QuadStore, outFile, typ string) error {
+	var f *os.File
+	if outFile == "-" {
+		f = os.Stdout
+	} else {
+		var err error
+		f, err = os.Create(outFile)
+		if err != nil {
+			return fmt.Errorf("could not open file %q: %v", outFile, err)
+		}
+		defer f.Close()
+		fmt.Printf("dumping db to file %q\n", outFile)
+	}
+
+	export := exporter.NewExporter(f, qs)
+	if export.Err() != nil {
+		return export.Err()
+	}
+
+        if outFile != "-" {
+		fmt.Printf("%d entries were written\n", export.Count())
+	}
+	return nil
+}