camtool: add env sub-command

cmd/camtool/env.go

@@ -0,0 +1,66 @@
+/*
+Copyright 2013 The Camlistore Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"camlistore.org/pkg/cmdmain"
+	"camlistore.org/pkg/osutil"
+)
+
+var envMap = map[string]func() string{
+	"configdir":    osutil.CamliConfigDir,
+	"clientconfig": osutil.UserClientConfigPath,
+	"serverconfig": osutil.UserServerConfigPath,
+}
+
+type envCmd struct{}
+
+func init() {
+	cmdmain.RegisterCommand("env", func(flags *flag.FlagSet) cmdmain.CommandRunner {
+		return new(envCmd)
+	})
+}
+
+func (c *envCmd) Describe() string {
+	return "Return Camlistore environment information"
+}
+
+func (c *envCmd) Usage() {
+	fmt.Fprintf(os.Stderr, "camtool env [key]\n")
+}
+
+func (c *envCmd) RunCommand(args []string) error {
+	if len(args) == 0 {
+		for k, fn := range envMap {
+			fmt.Printf("%s: %s\n", k, fn())
+		}
+		return nil
+	}
+	if len(args) > 1 {
+		return cmdmain.UsageError("only 0 or 1 arguments allowed")
+	}
+	fn := envMap[args[0]]
+	if fn == nil {
+		return fmt.Errorf("unknown environment key %q", args[0])
+	}
+	fmt.Println(fn())
+	return nil
+}