-// Multi is a Handler that looks up its first argument in a map, and
-// invokes the resulting Handler with the remaining args.
+// Version is a Handler that prints the package version (set at build
+// time using -ldflags) and Go runtime version to stdout, and returns
+// 0.
+var Version versionCommand
+
+var version = "dev"
+
+type versionCommand struct{}
+
+func (versionCommand) String() string {
+ return fmt.Sprintf("%s (%s)", version, runtime.Version())
+}
+
+func (versionCommand) RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
+ prog = regexp.MustCompile(` -*version$`).ReplaceAllLiteralString(prog, "")
+ fmt.Fprintf(stdout, "%s %s (%s)\n", prog, version, runtime.Version())
+ return 0
+}
+
+// Multi is a Handler that looks up its first argument in a map (after
+// stripping any "arvados-" or "crunch-" prefix), and invokes the
+// resulting Handler with the remaining args.