Add 'version' command

cmd/restic/cmd_version.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/restic/restic"
+)
+
+type CmdVersion struct{}
+
+func init() {
+	_, err := parser.AddCommand("version",
+		"display version",
+		"The version command displays detailed information about the version",
+		&CmdVersion{})
+	if err != nil {
+		panic(err)
+	}
+}
+
+func (cmd CmdVersion) Execute(args []string) error {
+	fmt.Printf("restic version %s, lib %v on %v\n", version, restic.Version, runtime.Version())
+	for _, s := range features {
+		fmt.Printf("  %s\n", s)
+	}
+	for _, s := range restic.Features {
+		fmt.Printf("  %s\n", s)
+	}
+
+	return nil
+}

version.go

@@ -0,0 +1,4 @@
+package restic
+
+var Version = "compiled manually"
+var Features = []string{}