cmd/ethereum: improve command line interface

The ethereum command line interface is now structured using subcommands.
These separate the different tasks it can perform.

Almost all flag names are backwards compatible.

The key tasks have not been ported to subcommands since they will be
replaced by the new accounts infrastructure very soon.

cmd/ethereum/js.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+// MA 02110-1301  USA
+
+package main
+
+import (
+	"io/ioutil"
+	"os"
+
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/javascript"
+	"github.com/ethereum/go-ethereum/xeth"
+)
+
+func execJsFile(ethereum *eth.Ethereum, filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		utils.Fatalf("%v", err)
+	}
+	content, err := ioutil.ReadAll(file)
+	if err != nil {
+		utils.Fatalf("%v", err)
+	}
+	re := javascript.NewJSRE(xeth.New(ethereum))
+	if _, err := re.Run(string(content)); err != nil {
+		utils.Fatalf("Javascript Error: %v", err)
+	}
+}